MedWorm: Nanotechnology

Nanotube LEDs make progress

Nanotechweb.org News — Fri, 20 Nov 2009 16:25:34 +0100

IBM team controls light emission from CNTs more precisely than ever before (Source: Nanotechweb.org News)

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Short metallic nanotubes made simple

Nanotechweb.org journal highlights — Fri, 20 Nov 2009 16:12:38 +0100

Fabricating metal nanotubes for magnetic data storage and drug-delivery applications now even easier (Source: Nanotechweb.org journal highlights)

Near-Infrared Fluorescent NanoGUMBOS for Biomedical Imaging

ACS Nano — Fri, 20 Nov 2009 13:27:47 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Making Graphene Luminescent by Oxygen Plasma Treatment

ACS Nano — Thu, 19 Nov 2009 21:04:08 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Functionalized Graphene Sheet Colloids for Enhanced Fuel/Propellant Combustion

ACS Nano — Thu, 19 Nov 2009 21:02:33 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Solution Assembly of Organized Carbon Nanotube Networks for Thin-Film Transistors

ACS Nano — Thu, 19 Nov 2009 17:07:14 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Effects of poly (lactic-co-glycolic acid) as a co-emulsifier on the preparation and hypoglycaemic activity of insulin-loaded solid lipid nanoparticles

IET Nanobiotechnology — Thu, 19 Nov 2009 16:37:47 +0100

Poly (lactic-co-glycolic acid) (PLGA) was used as a co-emulsifier in the preparation of insulin-loaded solid lipid nanoparticles (SLN) with hydrogenated castor oil as lipid matrix and lecithin as surfactant by doubleemulsion technique. The effects of PLGA on the preparation and hypoglycaemic activity of insulin-loaded SLN were studied. The results showed that with the supplement of PLGA, the encapsulation efficiency and loading capacity were increased significantly from 79.08±1.62 to 85.57±3.21% and 1.58±0.03 to 1.71±0.06%, whereas the surface charge and particle size were changed insignificantly from -25.87±2.65 to -22.67±1.19 mv and 431.0±16.1 to 397.0±68.0 nm, respectively. In vivo studies demonstrated that PLGA increased t...

Performance analysis and comparison of a minimum interconnections direct storage model with traditional neural bidirectional memories

IET Nanobiotechnology — Thu, 19 Nov 2009 16:37:47 +0100

This study proposes an efficient and improved model of a direct storage bidirectional memory, improved bidirectional associative memory (IBAM), and emphasises the use of nanotechnology for efficient implementation of such large-scale neural network structures at a considerable lower cost reduced complexity, and less area required for implementation. This memory model directly stores the X and Y associated sets of M bipolar binary vectors in the form of (M X Nx) and (M X Ny) memory matrices, requires O(N ) or about 30% of interconnections with weight strength ranging between ±1, and is computationally very efficient as compared to sequential, intraconnected and other bidirectional associative memory (BAM) models of outer-product type that require O(N 2) complex interconnections with...

IFN-beta stimulates astrocytes to relax

Nanotechweb.org journal highlights — Thu, 19 Nov 2009 16:29:45 +0100

Combination of atomic force microscopy and two-dimensional gel electrophoresis helps to unravel cellular characteristics (Source: Nanotechweb.org journal highlights)

nanoICT school on nanophotonics and modelling issues: presentations now available for download

Nanotechweb.org Your News — Thu, 19 Nov 2009 16:12:53 +0100

(Source: Nanotechweb.org Your News)

Holes block light in very thin films

Nanotechweb.org News — Thu, 19 Nov 2009 08:25:54 +0100

Finding points towards new kinds of polarization filters and other components for photonic circuits (Source: Nanotechweb.org News)

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New routes to adjusting light from artificial atoms

Nanotechweb.org journal highlights — Thu, 19 Nov 2009 08:21:15 +0100

Squeezing silicon quantum dots changes their colour (Source: Nanotechweb.org journal highlights)

A Calibration Method for Nanowire Biosensors to Suppress Device-to-Device Variation

ACS Nano — Wed, 18 Nov 2009 19:28:54 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Honokiol Nanoparticles in Thermosensitive Hydrogel: Therapeutic Effects on Malignant Pleural Effusion

ACS Nano — Wed, 18 Nov 2009 16:39:47 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Nanowire sheet has flexible LED applications covered

Nanotechweb.org News — Wed, 18 Nov 2009 16:28:44 +0100

Bendable visible and ultraviolet light-emitting devices prototyped using cotton-like zinc oxide product (Source: Nanotechweb.org News)

Template-Assisted Three-Dimensional Nanolithography via Geometrically Irreversible Processing.

Nano Letters — Wed, 18 Nov 2009 00:00:00 +0100

Authors: Yu X, Zhang H, Oliverio JK, Braun PV An innovative and versatile nanofabrication technique based on template assisted three-dimensional (3D) nanolithography is presented that takes advantage of the irreversibility of conformal growth and conformal etching at locations with negative surface curvatures in 3D templates. Using colloidal crystals as templates, nanoring particles are generated with quantity much higher than conventional methods. Relying on the same principle, metallodielectric photonic crystals with discrete metal elements are fabricated that show strong absorption in the near-IR and transmission at longer wavelengths. PMID: 19921779 [PubMed - as supplied by publisher] (Source: Nano Letters)

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Long-Range Fluorescence Quenching by Gold Nanoparticles in a Sandwich Immunoassay for Cardiac Troponin T.

Nano Letters — Wed, 18 Nov 2009 00:00:00 +0100

We report the first homogeneous sandwich immunoassay with gold nanoparticles (AuNPs) as fluorescence quenchers. The sandwich assay is designed for the detection of the protein cardiac troponin T (cTnT) by its simultaneous interaction with two different antibodies, one attached to AuNPs and the other labeled with fluorescent dyes. We demonstrate the working principle of the assay and using time-resolved fluorescence spectroscopy, we determine the quenching efficiency of the gold nanoparticles. In spite of the relatively large separation distance between dye molecules and AuNPs, ranging from 3 to 22 nm, the AuNPs quench the fluorescence with efficiencies as high as 95%. A limit of detection of 0.02 nM (0.7 ng/mL) was obtained for cTnT, which is the lowest value reported for a homogeneous san...

Carbon nanotubes towards medicinal biochips

Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology — Wed, 18 Nov 2009 00:00:00 +0100

This overview focuses on the recent advances in carbon nanotube (CNT)-based biochips and tries to clarify their potential for modern molecular medicine Copyright © 2009 John Wiley & Sons, Inc. (Source: Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology)

Size and Dynamics of Caveolae Studied Using Nanoparticles in Living Endothelial Cells

ACS Nano — Tue, 17 Nov 2009 20:06:13 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Graphene FETs get up to speed

Nanotechweb.org News — Tue, 17 Nov 2009 16:34:22 +0100

Organic polymer buffer layer allows carrier mobilities to remain high (Source: Nanotechweb.org News)

Placement Control of Nanomaterial Arrays on the Surface-Reconstructed Block Copolymer Thin Films

ACS Nano — Mon, 16 Nov 2009 19:58:01 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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From Tunneling to Hopping: A Comprehensive Investigation of Charge Transport Mechanism in Molecular Junctions Based on Oligo(p-phenylene ethynylene)s

ACS Nano — Mon, 16 Nov 2009 15:34:55 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Engineering ferroelectric switching via surface patterning

Nanotechweb.org journal highlights — Sat, 14 Nov 2009 16:15:39 +0100

High aspect ratio surface profiles can be used to trap reversed domains and engineer the asymmetry of the hysteresis loop (Source: Nanotechweb.org journal highlights)

Molecular Dynamics and Phase Transition in One-Dimensional Crystal of C60 Encapsulated Inside Single Wall Carbon Nanotubes

ACS Nano — Fri, 13 Nov 2009 20:35:25 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Selective Interactions of Sugar-Functionalized Single-Walled Carbon Nanotubes with Bacillus Spores

ACS Nano — Fri, 13 Nov 2009 20:31:45 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Controllable Nanofabrication of Aggregate-like Nanoparticle Substrates and Evaluation for Surface-Enhanced Raman Spectroscopy

ACS Nano — Fri, 13 Nov 2009 20:30:26 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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CdS Magic-Sized Nanocrystals Exhibiting Bright Band Gap Photoemission via Thermodynamically Driven Formation

ACS Nano — Fri, 13 Nov 2009 16:56:16 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

QD-modified microbubbles operate as bifunctional imaging agents

Nanotechweb.org journal highlights — Fri, 13 Nov 2009 16:33:44 +0100

High-contrast ultrasound set-up releases quantum dots for fluorescent imaging (Source: Nanotechweb.org journal highlights)

Electric fields cause huge change in CNT optical behaviour

Nanotechweb.org News — Fri, 13 Nov 2009 16:30:40 +0100

IBM team says effect could be useful for future electro-optics devices (Source: Nanotechweb.org News)

Charge Carrier Motion in Disordered Conjugated Polymers: A Multiscale Ab Initio Study.

Nano Letters — Fri, 13 Nov 2009 00:00:00 +0100

Authors: Vukmirović N, Wang LW We developed an ab initio multiscale method for simulation of carrier transport in large disordered systems, based on direct calculation of electronic states and electron-phonon coupling constants. It enabled us to obtain the never seen before rich microscopic details of carrier motion in conjugated polymers, which led us to question several assumptions of phenomenological models, widely used in such systems. The macroscopic mobility of disordered poly(3-hexylthiophene) (P3HT) polymer, extracted from our simulation, is in agreement with experimental results from the literature. PMID: 19908900 [PubMed - as supplied by publisher] (Source: Nano Letters)

Pd-Sensitized Single Vanadium Oxide Nanowires: Highly Responsive Hydrogen Sensing Based on the Metal-Insulator Transition.

Nano Letters — Fri, 13 Nov 2009 00:00:00 +0100

Authors: Baik JM, Kim MH, Larson C, Yavuz CT, Stucky GD, Wodtke AM, Moskovits M Exceptionally sensitive hydrogen sensors were produced using Pd-nanoparticle-decorated, single vanadium dioxide nanowires. The high-sensitivity arises from the large downward shift in the insulator to metal transition temperature following the adsorption on and incorporation of atomic hydrogen, produced by dissociative chemisorption on Pd, in the VO(2), producing approximately 1000-fold current increases. During a rapid initial process, the insulator to metal transition temperature is decreased by >10 degrees C even when exposed to trace amounts of hydrogen gas. Subsequently, hydrogen continues to diffuse into the VO(2) for several hours before saturation is achieved with only a modest change in the insu...

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An Upper Bound to Carrier Multiplication Efficiency in Type II Colloidal Quantum Dots.

Nano Letters — Fri, 13 Nov 2009 00:00:00 +0100

This study indicates that, while CM is probably present in type II QD heterostructures below the CM threshold for each constituent separately, it exhibits only a modest yield. PMID: 19911830 [PubMed - as supplied by publisher] (Source: Nano Letters)

Functional Si and CdSe Quantum Dots: Synthesis, Conjugate Formation, and Photoluminescence Quenching by Surface Interactions

ACS Nano — Thu, 12 Nov 2009 18:40:11 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Investigating the Graphitization Mechanism of SiO2 Nanoparticles in Chemical Vapor Deposition

ACS Nano — Thu, 12 Nov 2009 18:39:07 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Conquering the Dark Side: Colloidal Iron Oxide Nanoparticles

ACS Nano — Thu, 12 Nov 2009 18:38:39 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Origin of Laser-Induced Near-Subwavelength Ripples: Interference between Surface Plasmons and Incident Laser

ACS Nano — Thu, 12 Nov 2009 18:38:16 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Smart concrete detects traffic flow

Nanotechweb.org News — Thu, 12 Nov 2009 09:00:00 +0100

Multi-walled carbon nanotube admixture turns concrete road surface into a vehicle sensor (Source: Nanotechweb.org News)

Characterization study: wurtzite GaAs/AlGaAs core-shell nanowires

Nanotechweb.org journal highlights — Thu, 12 Nov 2009 08:22:47 +0100

Structure of GaAs/AlGaAs core-shell nanowires exposed to provide knowledge base for future nano-photonic and nano-electronic devices (Source: Nanotechweb.org journal highlights)

Nanowriter manipulates magnetic nanoparticles for high-density data storage

Nanotechweb.org journal highlights — Thu, 12 Nov 2009 08:19:54 +0100

Dispersion and morphology of as-grown self-organized nanoparticles can be tuned via the post-irradiation dose of a low-energy ion beam (Source: Nanotechweb.org journal highlights)

Subthreshold Regime has the Optimal Sensitivity for Nanowire FET Biosensors.

Nano Letters — Thu, 12 Nov 2009 00:00:00 +0100

Authors: Gao XP, Zheng G, Lieber CM Nanowire field-effect transistors (NW-FETs) are emerging as powerful sensors for detection of chemical/biological species with various attractive features including high sensitivity and direct electrical readout. Yet to date there have been limited systematic studies addressing how the fundamental factors of devices affect their sensitivity. Here we demonstrate that the sensitivity of NW-FET sensors can be exponentially enhanced in the subthreshold regime where the gating effect of molecules bound on a surface is the most effective due to the reduced screening of carriers in NWs. This principle is exemplified in both pH and protein sensing experiments where the operational mode of NW-FET biosensors was tuned by electrolyte gating. The lowest charge d...

Heterogenous Catalysis Mediated by Plasmon Heating.

Nano Letters — Thu, 12 Nov 2009 00:00:00 +0100

Authors: Adleman JR, Boyd DA, Goodwin DG, Psaltis D We introduce a new method for performing and miniaturizing many types of heterogeneous catalysis involving nanoparticles. The method makes use of the plasmon resonance present in nanoscale metal catalysts to provide the necessary heat of reaction when illuminated with a low-power laser. We demonstrate our approach by reforming a flowing, liquid mixture of ethanol and water over gold nanoparticle catalysts in a microfluidic channel. Plasmon heating of the nanoparticles provides not only the heat of reaction but the means to generate both water and ethanol vapor locally over the catalysts, which in turn allows the chip and the fluid lines to remain at room temperature. The measured products of the reaction, CO(2), CO, and H(2), are cons...

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Metal-Driven Hierarchical Self-Assembled One-Dimensional Nanohelices.

Nano Letters — Thu, 12 Nov 2009 00:00:00 +0100

Authors: Qiao Y, Lin Y, Wang Y, Yang Z, Liu J, Zhou J, Yan Y, Huang J Sophisticated helical structure has been an attractive subject due to its significance in understanding of biological self-assembly and appealing application in nanoscience. In this work, a facile route toward one-dimensional helical nanostructure is presented based on metal-cholate supramolecular self-assembly. Well-defined right-handed helical nanoribbons in calcium-cholate systems are systematically investigated and a series of metal ions are exploited to drive metal-cholate supramolecular helix. It is anticipated that the incorporation of metal ions may endow versatile functionalities and merits to the self-assembled nanohelices. Particularly helical inorganic nanomaterials (i.e., SiO(2) and ZnS) have been prepar...

Chemical Fabrication of Heterometallic Nanogaps for Molecular Transport Junctions.

Nano Letters — Thu, 12 Nov 2009 00:00:00 +0100

We report a simple and reproducible method for fabricating heterometallic nanogaps, which are made of two different metal nanorods separated by a nanometer-sized gap. The method is based upon on-wire lithography, which is a chemically enabled technique used to synthesize a wide variety of nanowire-based structures (e.g., nanogaps and disk arrays). This method can be used to fabricate pairs of metallic electrodes, which exhibit distinct work functions and are separated by gaps as small as 2 nm. Furthermore, we demonstrate that a symmetric thiol-terminated molecule can be assembled into such heterometallic nanogaps to form molecular transport junctions (MTJs) that exhibit molecular diode behavior. Theoretical calculations demonstrate that the coupling strength between gold and sulfur (Au-S) ...

Two-Terminal Nonvolatile Memories Based on Single-Walled Carbon Nanotubes

ACS Nano — Wed, 11 Nov 2009 19:56:25 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Fabrication and Electrical Properties of Si Nanowires Synthesized by Al Catalyzed Vapor-Liquid-Solid Growth.

Nano Letters — Wed, 11 Nov 2009 00:00:00 +0100

Authors: Ke Y, Weng X, Redwing JM, Eichfeld CM, Swisher TR, Mohney SE, Habib YM The synthesis of epitaxially oriented Si nanowires at high growth rates (>1 mum/min) was demonstrated on (111) Si substrates using Al as the catalyst. The use of high H(2) and SiH(4) partial pressures was found to be effective at reducing problems associated with Al oxidation and nanowire nucleation, enabling growth of high aspect ratio structures at temperatures ranging from 500 to 600 degrees C with minimal tapering of the diameter. Because of the high growth rate observed, the Al catalyst is believed to be in the liquid state during the growth. Four-point resistance measurements and back-gated current-voltage measurements indicate that the wires are p-type with an average resistivity of 0.01 +/- 0.004...

Spatial Resolution of a Type II Heterojunction in a Single Bipolar Molecule.

Nano Letters — Wed, 11 Nov 2009 00:00:00 +0100

Authors: Tao C, Sun J, Zhang X, Yamachika R, Wegner D, Bahri Y, Samsonidze G, Cohen ML, Louie SG, Tilley TD, Segalman RA, Crommie MF Bipolar molecules incorporating donor and acceptor components within a single molecule create exciting device opportunities due to their possible use as nanoscale p-n heterojunctions. Here we report a direct characterization of the internal electronic structure of a single bipolar molecular heterojunction, including subnanometer features of the intramolecular donor-acceptor interface. Angstrom-resolved scanning tunneling spectroscopy was used to map the energy levels and spatial extent of molecular orbitals across the surface of an individual bipolar molecule, bithiophene naphthalene diimide (BND). We find that individual BND molecules exhibit type II het...

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Photo-Targeted Nanoparticles.

Nano Letters — Wed, 11 Nov 2009 00:00:00 +0100

We report a novel and simple proof-of-concept of a nanoparticulate system that targets any tissue selectively upon illumination. Nanoparticles were covalently functionalized with the amino acid sequence YIGSR, which adheres to the beta1 integrins present on most cell surfaces. This peptide was masked with a caging group, rendering it biologically inert. Illumination with UV light released the caging group from the YIGSR, allowing binding to cells. PMID: 19904979 [PubMed - as supplied by publisher] (Source: Nano Letters)

Templated Self-Assembly of Square Symmetry Arrays from an ABC Triblock Terpolymer.

Nano Letters — Wed, 11 Nov 2009 00:00:00 +0100

Authors: Chuang VP, Gwyther J, Mickiewicz RA, Manners I, Ross CA Self-assembly provides the ability to create well-controlled nanostructures with electronic or chemical functionality and enables the synthesis of a wide range of useful devices. Diblock copolymers self-assemble into periodic arrays of microdomains with feature sizes of typically 10-50 nm, and have been used to make a wide range of devices such as silicon capacitors and transistors, photonic crystals, and patterned magnetic media(1-3). However, the cylindrical or spherical microdomains in diblock copolymers generally form close-packed structures with hexagonal symmetry, limiting their device applications. Here we demonstrate self-assembly of square-symmetry patterns from a triblock terpolymer in which one organometallic b...

Electric Field Directed Self-Assembly of Cuprous Oxide Nanostructures for Photon Sensing

ACS Nano — Tue, 10 Nov 2009 20:04:38 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Organic Light-Emitting Diodes on Solution-Processed Graphene Transparent Electrodes

ACS Nano — Tue, 10 Nov 2009 19:57:51 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Endosomal Leakage and Nuclear Translocation of Multiwalled Carbon Nanotubes: Developing a Model for Cell Uptake.

Nano Letters — Tue, 10 Nov 2009 00:00:00 +0100

We report our findings on cellular membrane penetration, endocytosis, endosomal leakage, and nuclear translocation of multiwalled carbon nanotubes (MWCNTs). Our data is consistent with a working model for MWCNTs' cell uptake and cellular translocations. PMID: 19902917 [PubMed - as supplied by publisher] (Source: Nano Letters)

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Direct Correlation of Structural Domain Formation with the Metal Insulator Transition in a VO(2) Nanobeam.

Nano Letters — Tue, 10 Nov 2009 00:00:00 +0100

Authors: Zhang S, Chou JY, Lauhon LJ The electrical resistance of single VO(2) nanobeams was measured while simultaneously mapping the domain structure with Raman spectroscopy to investigate the relationship between structural domain formation and the metal-insulator transition. With increasing temperature, the nanobeams transformed from the insulating monoclinic M(1) phase to a mixture of the Mott-insulating M(2) and metallic rutile phases. Domain fractions were used to extract the temperature dependent resistivity of the M(2) phase, which showed an activated behavior consistent with the expected Mott-Hubbard gap. Metallic monoclinic phases were also produced by direct injection of charge into devices, decoupling the Mott metal-insulator transition from the monoclinic to rutile struct...

Detection of Local Protein Structures along DNA Using Solid-State Nanopores.

Nano Letters — Tue, 10 Nov 2009 00:00:00 +0100

Authors: Kowalczyk SW, Hall AR, Dekker C Nanopores have been successfully employed as a new tool to rapidly detect single biopolymers, in particular DNA. When a molecule is driven through a nanopore by an externally applied electric field, it causes a characteristic temporary change in the trans-pore current. Here, we examine the translocation of DNA with discrete patches of the DNA-repair protein RecA attached along its length. Using the fact that RecA-coated DNA and bare DNA yield very different current-blockade signatures, we demonstrate that it is possible to map the locations of the proteins along the length of a single molecule using a solid-state nanopore. This is achieved at high speed and without any staining. We currently obtain a spatial resolution of about 8 nm, or 5 RecA p...

Wafer-Scale Fabrication of Separated Carbon Nanotube Thin-Film Transistors for Display Applications.

Nano Letters — Tue, 10 Nov 2009 00:00:00 +0100

Authors: Wang C, Zhang J, Ryu K, Badmaev A, De Arco LG, Zhou C Preseparated, semiconductive enriched carbon nanotubes hold great potential for thin-film transistors and display applications due to their high mobility, high percentage of semiconductive nanotubes, and room-temperature processing compatibility. Here in this paper, we report our progress on wafer-scale processing of separated nanotube thin-film transistors (SN-TFTs) for display applications, including key technology components such as wafer-scale assembly of high-density, uniform separated nanotube networks, high-yield fabrication of devices with superior performance, and demonstration of organic light-emitting diode (OLED) switching controlled by a SN-TFT. On the basis of separated nanotubes with 95% semiconductive nanotu...

Bioimaging: Second window for in vivo imaging

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Authors: Andrew M. Smith, Michael C. Mancini & Shuming Nie Enhanced fluorescence from carbon nanotubes and advances in near-infrared cameras have opened up a new wavelength window for small animal imaging. (Source: Nature Nanotechnology)

Nanophotonics: Free electrons get light out of a hole

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Nature Nanotechnology 4, 707 (2009). doi:10.1038/nnano.2009.331 Author: Gordon Robb A device called a light well might form the basis of a tunable nanoscale laser. (Source: Nature Nanotechnology)

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Nanophotonics: Lasers go beyond diffraction limit

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Nature Nanotechnology 4, 706 (2009). doi:10.1038/nnano.2009.330 Author: Martin T. Hill Two groups of researchers have shown that the minimum size of a laser need not be restricted by the wavelength of light it emits, provoking a rethink of what optics and lasers can do at the nanoscale. (Source: Nature Nanotechnology)

Nanotechnology and society: The evolution of risk perceptions

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Nature Nanotechnology 4, 705 (2009). doi:10.1038/nnano.2009.329 Author: Dan M. Kahan A meta-analysis of surveys about public perceptions of the risks and benefits associated with nanotechnology suggests that further research is needed to help us better understand and, perhaps, inform public attitudes to nanotechnology. (Source: Nature Nanotechnology)

Optomechanical crystals: Periodic nanobeams bring light and sound together

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Nature Nanotechnology 4, 704 (2009). doi:10.1038/nnano.2009.325 Author: Owain Vaughan (Source: Nature Nanotechnology)

Polymers: Performing under pressure

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Authors: Thomas P. Russell & Dong Hyun Lee Most probe-based approaches to data storage rely on heating a polymer substrate with a tip, but a new approach relies on pressure instead. (Source: Nature Nanotechnology)

Top down bottom up: Ring cycle

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Nature Nanotechnology 4, 701 (2009). doi:10.1038/nnano.2009.324 The cooling rates of fullerene ions have been measured at a storage ring in Japan. (Source: Nature Nanotechnology)

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Nanoparticles offer hope for TB detection

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Nature Nanotechnology 4, 698 (2009). doi:10.1038/nnano.2009.322 Author: Ai Lin Chun Combining magnetic nanoparticles, microfluidics and nuclear magnetic resonance could transform the way tuberculosis and other diseases are diagnosed. (Source: Nature Nanotechnology)

God in the lab

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Nature Nanotechnology 4, 696 (2009). doi:10.1038/nnano.2009.321 Author: Chris Toumey Surveys have found that almost half of all scientists in the US are religious. Chris Toumey explores what this might mean for nanotechnology. (Source: Nature Nanotechnology)

Keeping the public under the microscope

Nature Nanotechnology — Mon, 09 Nov 2009 16:56:20 +0100

Nature Nanotechnology 4, 695 (2009). doi:10.1038/nnano.2009.320 New research confirms that the proportion of the public that knows about nanotechnology has reached a plateau, which means that it is now necessary to develop new approaches to explore public perceptions in greater detail than before. (Source: Nature Nanotechnology)

Research into emerging technologies from the University of Southampton and Durham University confirmed as winners at this year’s UK Nano & Emerging Technologies Forum

Nanotechweb.org Your News — Mon, 09 Nov 2009 16:38:06 +0100

(Source: Nanotechweb.org Your News)

Manipulating Nanoscale Light Fields with the Asymmetric Bowtie Nano-Colorsorter.

Nano Letters — Mon, 09 Nov 2009 00:00:00 +0100

We present a class of devices called Asymmetric Bowtie nano-Colorsorters. These devices are specifically engineered to not only capture and confine optical fields, but also to spectrally filter and steer them while maintaining nanoscale field distributions. We show that spectral properties and localized spatial mode distributions can be readily tuned by controlled asymmetry. Nano-Colorsorters can control light's spatial and spectral distributions at the nanoscale and thus significantly impact applications ranging from broadband light harvesting to ultrafast wavelength-selective photodetection. PMID: 19899744 [PubMed - as supplied by publisher] (Source: Nano Letters)

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Alignment Controlled Growth of Single-Walled Carbon Nanotubes on Quartz Substrates.

Nano Letters — Mon, 09 Nov 2009 00:00:00 +0100

Authors: Xiao J, Dunham S, Liu P, Zhang Y, Kocabas C, Moh L, Huang Y, Hwang KC, Lu C, Huang W, Rogers JA Single-walled carbon nanotubes (SWNTs) possess extraordinary electrical properties, with many possible applications in electronics. Dense, horizonally aligned arrays of linearly configured SWNTs represent perhaps the most attractive and scalable way to implement this class of nanomaterial in practical systems. Recent work shows that templated growth of tubes on certain crystalline substrates yields arrays with the necessary levels of perfection, as demonstrated by the formation of devices and full systems on quartz. This paper examines advanced implementations of this process on crystalline quartz substrates with different orientations, to yield strategies for forming diverse, but w...

Principles and applications of nanofluidic transport

Nature Nanotechnology — Sun, 08 Nov 2009 00:00:00 +0100

Authors: W. Sparreboom, A. van den Berg & J. C. T. Eijkel (Source: Nature Nanotechnology)

Nanostructures through chaos: nanoporous films made easy

Nanotechweb.org journal highlights — Sat, 07 Nov 2009 16:06:48 +0100

Rapid fabrication of stable films for biosensing, photonics and separation technologies (Source: Nanotechweb.org journal highlights)

'Universal' equation describes how materials behave at nanoscale

Nanotechweb.org News — Sat, 07 Nov 2009 15:52:55 +0100

'No supercomputers involved', says physicist (Source: Nanotechweb.org News)

Sharper and Faster “Nano Darts” Kill More Bacteria: A Study of Antibacterial Activity of Individually Dispersed Pristine Single-Walled Carbon Nanotube

ACS Nano — Fri, 06 Nov 2009 17:18:32 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Dip-pen nanolithography safeguards CNT contacts

Nanotechweb.org News — Fri, 06 Nov 2009 16:11:21 +0100

DPN provides an alternative to conventional electron-beam techniques because it does not damage nanotubes (Source: Nanotechweb.org News)

Bio-highlighter: NIR-emitting alloyed quantum dots

Nanotechweb.org journal highlights — Fri, 06 Nov 2009 16:04:47 +0100

Easier to make, high-quality CdSeTe alloyed quantum dots shown to be an effective fluorescent probe (Source: Nanotechweb.org journal highlights)

Nanoscale Contacts between Carbon Nanotubes and Metallic Pads

ACS Nano — Fri, 06 Nov 2009 15:56:23 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Plate-shaped photocatalyst shines in testing phase

Nanotechweb.org journal highlights — Fri, 06 Nov 2009 10:00:00 +0100

Light-activated nanostructures tuned for more efficient wastewater treatment (Source: Nanotechweb.org journal highlights)

Identification of Surface Structures on 3C-SiC Nanocrystals with Hydrogen and Hydroxyl Bonding by Photoluminescence.

Nano Letters — Fri, 06 Nov 2009 00:00:00 +0100

Authors: Wu XL, Xiong SJ, Zhu J, Wang J, Shen JC, Chu PK SiC nanocrystals (NCs) exhibit unique surface chemistry and possess special properties. This provides the opportunity to design suitable surface structures by terminating the surface dangling bonds with different atoms thereby boding well for practical applications. In this article, we report the photoluminescence properties of 3C-SiC NCs in water suspensions with different pH values. Besides a blue band stemming from the quantum confinement effect, the 3C-SiC NCs show an additional photoluminescence band at 510 nm when the excitation wavelengths are longer than 350 nm. Its intensity relative to the blue band increases with the excitation wavelength. The 510 nm band appears only in acidic suspensions but not in alkaline ones. Fou...

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Toughening through Nature-Adapted Nanoscale Design.

Nano Letters — Fri, 06 Nov 2009 00:00:00 +0100

Authors: Burghard Z, Zini L, Srot V, Bellina P, Aken PA, Bill J The extraordinary combination of strength and toughness attained by nature's highly sophisticated structural design in nacre has inspired the synthesis of novel nanocomposites. In this context, the organic-inorganic hierarchical design of nacre has been mimicked. However, two key features of nacre, namely the scaling of the structural components and the low content of the organic phase, have not been replicated yet. Here, we present thin nanocomposite films with properly adjusted thicknesses of the organic and inorganic layers, as well as a microstructure that closely resembles that of nacre. These films, which are obtained by the combination of low-temperature chemical bath deposition of titania with layer-by-layer assemb...

Functional role of the nicotinic arm of the acetylcholine regulatory axis in human B-cell lines

International Journal of Nanomedicine — Thu, 05 Nov 2009 16:37:40 +0100

Juan Arredondo, Denys Omelchenko, Alexander I Chernyavsky, et al (Source: International Journal of Nanomedicine)

Nanoparticle array compressed to overcome conductivity hurdle

Nanotechweb.org journal highlights — Thu, 05 Nov 2009 16:18:50 +0100

Photo-polymerisation of host matrix enhances conductivity by bringing nanoparticles closer together (Source: Nanotechweb.org journal highlights)

Understanding the Electronic Structure of Metal/SAM/Organic−Semiconductor Heterojunctions

ACS Nano — Thu, 05 Nov 2009 16:01:17 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Effect of Orientation on Plasmonic Coupling between Gold Nanorods

ACS Nano — Thu, 05 Nov 2009 15:41:47 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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In Situ Intracellular Spectroscopy with Surface Enhanced Raman Spectroscopy (SERS)-Enabled Nanopipettes

ACS Nano — Thu, 05 Nov 2009 15:22:39 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Quantitative Investigation of Compartmentalized Dynamics of ErbB2 Targeting Gold Nanorods in Live Cells by Single Molecule Spectroscopy

ACS Nano — Thu, 05 Nov 2009 14:55:44 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Bacterial Motility and Clustering Guided by Microcontact Printing.

Nano Letters — Thu, 05 Nov 2009 00:00:00 +0100

Authors: Holz C, Opitz D, Mehlich J, Ravoo BJ, Maier B Type IV pili are bacterial nanomotors that mediate two opposing behaviors on surfaces, spreading and clustering. Here we show that the velocity of motile Neisseria gonorrhoeae depends quantitatively on the fluidity of the phospholipid membrane surface. Using microcontact printing, we confined the surface motility to nonfluid islands within a fluid lipid membrane. On an array of islands, the transition from spreading to clustering was analyzed in real time and at the single cell level, showing that it was triggered by the number of bacteria (7.5 +/- 0.3) for small islands and by the surface density (56 +/- 2%) when the size of the island exceeded 25 mum(2). PMID: 19891453 [PubMed - as supplied by publisher] (Source: Nano Letters...

Nanodome Solar Cells with Efficient Light Management and Self-Cleaning.

Nano Letters — Thu, 05 Nov 2009 00:00:00 +0100

Authors: Zhu J, Hsu CM, Yu Z, Fan S, Cui Y Here for the first time, we demonstrate novel nanodome solar cells, which have periodic nanoscale modulation for all layers from the bottom substrate, through the active absorber to the top transparent contact. These devices combine many nanophotonic effects to both efficiently reduce reflection and enhance absorption over a broad spectral range. Nanodome solar cells with only a 280 nm thick hydrogenated amorphous silicon (a-Si:H) layer can absorb 94% of the light with wavelengths of 400-800 nm, significantly higher than the 65% absorption of flat film devices. Because of the nearly complete absorption, a very large short-circuit current of 17.5 mA/cm(2) is achieved in our nanodome devices. Excitingly, the light management effects remain effic...

Efficient CdSe Quantum Dot-Sensitized Solar Cells Prepared by an Improved Successive Ionic Layer Adsorption and Reaction Process.

Nano Letters — Thu, 05 Nov 2009 00:00:00 +0100

Authors: Lee H, Wang M, Chen P, Gamelin DR, Zakeeruddin SM, Grätzel M, Nazeeruddin MK In pursuit of efficient quantum dot (QD)-sensitized solar cells based on mesoporous TiO(2) photoanodes, a new procedure for preparing selenide (Se(2-)) was developed and used for depositing CdSe QDs in situ over TiO(2) mesopores by the successive ionic layer adsorption and reaction (SILAR) process in ethanol. The sizes and density of CdSe QDs over TiO(2) were controlled by the number of SILAR cycles applied. After some optimization of these QD-sensitized TiO(2) films in regenerative photoelectrochemical cells using a cobalt redox couple [Co(o-phen)(3)(2+/3+)], including addition of a final layer of CdTe, over 4% overall efficiencies were achieved at 100 W/m(2) with about 50% IPCE at its maximum...

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Thermoelectric Efficiency in Nanojunctions: A Comparison between Atomic Junctions and Molecular Junctions

ACS Nano — Wed, 04 Nov 2009 17:35:54 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Promoter Quadruplexes

NanoFocus — Wed, 04 Nov 2009 16:58:24 +0100

Folded DNA structures in gene-activation sites may be useful cancer drug targets. (Source: NanoFocus)

Moth's eye inspires multifunctional anti-reflection surface

Nanotechweb.org News — Wed, 04 Nov 2009 16:43:35 +0100

Periodic nano-pyramids reduce reflection below 0.45% for unpolarized light over the visible spectrum (Source: Nanotechweb.org News)

Surface-Assisted Assembly of Discrete Porphyrin-Based Cyclic Supramolecules.

Nano Letters — Wed, 04 Nov 2009 00:00:00 +0100

Authors: Heim D, Seufert K, Auwärter W, Aurisicchio C, Fabbro C, Bonifazi D, Barth JV We employed de novo synthesized porphyrin modules to construct discrete cyclic supramolecular architectures supported on a copper surface. The programmed geometry and functionality of the molecular modules together with their conformational flexibility and substrate interaction yields symmetric discrete assemblies, including dimers and chains as well as three- to six-membered cyclic structures. The area of the molecular cavities is extended by creating bicomponent structures combining building blocks with different symmetry. PMID: 19888718 [PubMed - as supplied by publisher] (Source: Nano Letters)

Supramolecular Protein Cage Composite MR Contrast Agents with Extremely Efficient Relaxivity Properties.

Nano Letters — Wed, 04 Nov 2009 00:00:00 +0100

Authors: Liepold LO, Abedin MJ, Buckhouse ED, Frank JA, Young MJ, Douglas T A DTPA-Gd containing polymer was grown in the interior of a heat shock protein cage resulting in T(1) particle relaxivities of 4200 mM(-1) sec(-1) for the 12 nm particle. Relaxivity parameters were determined, and this analysis suggests that the rotational correlation time has been optimized while the water exchange lifetime is longer than optimal. This synthetic approach holds much promise for the development of next generation contrast agents and this report will aid in their design. PMID: 19888720 [PubMed - as supplied by publisher] (Source: Nano Letters)

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Transparent Conductive Coatings by Printing coffee Ring Arrays Obtained at Room Temperature

ACS Nano — Tue, 03 Nov 2009 18:03:13 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Selection of Metal Oxide Charge Transport Layers for Colloidal Quantum Dot LEDs

ACS Nano — Tue, 03 Nov 2009 17:58:50 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Ag@SiO2 Core−Shell Nanoparticles for Probing Spatial Distribution of Electromagnetic Field Enhancement via Surface-Enhanced Raman Scattering

ACS Nano — Tue, 03 Nov 2009 17:57:51 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Nanoscale pick-and-place

Nanotechweb.org News — Tue, 03 Nov 2009 16:26:51 +0100

Design unveiled for grabbing and holding a nanoscale particle in water without touching it (Source: Nanotechweb.org News)

Resolution and Enhancement in Nanoantenna-Based Fluorescence Microscopy.

Nano Letters — Tue, 03 Nov 2009 00:00:00 +0100

Authors: Eghlidi H, Lee KG, Chen XW, Götzinger S, Sandoghdar V Single gold nanoparticles can act as nanoantennas for enhancing the fluorescence of emitters in their near fields. Here we present experimental and theoretical studies of scanning antenna-based fluorescence microscopy as a function of the diameter of the gold nanoparticle. We examine the interplay between fluorescence enhancement and spatial resolution and discuss the requirements for deciphering single molecules in a dense sample. Resolutions better than 20 nm and fluorescence enhancement up to 30 times are demonstrated experimentally. By accounting for the tip shaft and the sample interface in finite-difference time-domain calculations, we explain why the measured fluorescence enhancements are higher in the presenc...

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Nanogenomics in medicine

Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology — Tue, 03 Nov 2009 00:00:00 +0100

This review presents the status of technological developments of nanogenomics and its applications to medicine. Even if particular emphasis is placed on what has been accomplished in our laboratory in the last few years in the area of genes microarrays, significant reference to the recent activity of numerous other groups can be found in Refs , Copyright © 2009 John Wiley & Sons, Inc. (Source: Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology)

Confinement of MgH2 Nanoclusters within Nanoporous Aerogel Scaffold Materials

ACS Nano — Mon, 02 Nov 2009 21:18:04 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Controlled Fabrication of Polyaniline Spherical and Cubic Shells with Hierarchical Nanostructures

ACS Nano — Mon, 02 Nov 2009 19:30:12 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Unravelling the Mechanisms Behind Mixed Catalysts for the High Yield Production of Single-Walled Carbon Nanotubes

ACS Nano — Mon, 02 Nov 2009 17:51:56 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Patterning Graphene at the Nanometer Scale via Hydrogen Desorption.

Nano Letters — Mon, 02 Nov 2009 00:00:00 +0100

Authors: Sessi P, Guest JR, Bode M, Guisinger NP We have demonstrated the reversible and local modification of the electronic properties of graphene by hydrogen passivation and subsequent electron-stimulated hydrogen desorption with an scanning tunneling microscope tip. In addition to changing the morphology, we show that the hydrogen passivation is stable at room temperature and modifies the electronic properties of graphene, opening a gap in the local density of states. This insulating state is reversed by local desorption of the hydrogen, and the unaltered electronic properties of graphene are recovered. Using this mechanism, we have "written" graphene patterns on nanometer length scales. For patterned regions that are roughly 20 nm or greater, the inherent electronic properties of ...

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Utilization of a Buffered Dielectric to Achieve High Field-Effect Carrier Mobility in Graphene Transistors.

Nano Letters — Mon, 02 Nov 2009 00:00:00 +0100

Authors: Farmer DB, Chiu HY, Lin YM, Jenkins KA, Xia F, Avouris P We utilize an organic polymer buffer layer between graphene and conventional gate dielectrics in top-gated graphene transistors. Unlike other insulators, this dielectric stack does not significantly degrade carrier mobility, allowing for high field-effect mobilities to be retained in top-gate operation. This is demonstrated in both two-point and four-point analysis and in the high-frequency operation of a graphene transistor. Temperature dependence of the carrier mobility suggests that phonons are the dominant scatterers in these devices. PMID: 19883119 [PubMed - as supplied by publisher] (Source: Nano Letters)

In Vivo Near-Infrared Mediated Tumor Destruction by Photothermal Effect of Carbon Nanotubes

ACS Nano — Fri, 30 Oct 2009 19:15:15 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Hematite (α-Fe2O3) with Various Morphologies: Ionic Liquid-Assisted Synthesis, Formation Mechanism, and Properties

ACS Nano — Fri, 30 Oct 2009 19:13:57 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Nanostars rival fluorophores for imaging

Nanotechweb.org News — Fri, 30 Oct 2009 16:13:48 +0100

Pointy nanomolecules could be better for long or repeated imaging studies (Source: Nanotechweb.org News)

Implementing Platform Approaches to Streamline the Design, Operation and Validation of Biopharmaceutical Facilities

Nanotechweb.org Events — Fri, 30 Oct 2009 16:11:47 +0100

Conference: 5 Nov 2009, United States. Organized by ComplianceOnline. (Source: Nanotechweb.org Events)

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Boron nitride nanotubes measure pH locally

Nanotechweb.org journal highlights — Fri, 30 Oct 2009 16:11:45 +0100

Submicrometre-sized sensor features biotin-fluorescein-functonalized BN nanotubes with anchored silver nanoparticles (Source: Nanotechweb.org journal highlights)

Nonlocal Chemical Reactivity at Organic−Metal Interfaces

ACS Nano — Fri, 30 Oct 2009 13:59:15 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Ultrathin Carbon Nanotube Fibrils of High Electrochemical Capacitance

ACS Nano — Fri, 30 Oct 2009 13:51:57 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Diffusion- and Reaction-Limited Growth of Carbon Nanotube Forests

ACS Nano — Fri, 30 Oct 2009 13:51:08 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Carbon nanotube arrays behave like conducting rubber

Nanotechweb.org News — Fri, 30 Oct 2009 10:20:00 +0100

Electrostatic actuator showcases reproducible movement of vertically aligned carbon nanotubes (Source: Nanotechweb.org News)

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Thin film provides simple white-light solution

Nanotechweb.org News — Fri, 30 Oct 2009 08:30:28 +0100

Easy-to-fabricate ZnO nanorod/polyfluorene nanocomposite gives LED makers a low-cost white-light option (Source: Nanotechweb.org News)

Core−Shell Chromium Silicide−Silicon Nanopillars: A Contact Material for Future Nanosystems

ACS Nano — Fri, 30 Oct 2009 05:13:52 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Plasmonic Lens Made of Multiple Concentric Metallic Rings under Radially Polarized Illumination.

Nano Letters — Fri, 30 Oct 2009 00:00:00 +0100

Authors: Chen W, Abeysinghe DC, Nelson RL, Zhan Q Optimal plasmonic focusing can be achieved through matching the rotational symmetry of the plasmonic lens to the polarization symmetry of a radially polarized illumination. In this letter, we report the experimental confirmation of the focusing properties and field enhancement effect of plasmonic lens made of multiple concentric annular rings using a collection mode near field scanning optical microscope. Surface plasmons excited at all azimuthal directions propagate toward the geometric center and constructively interfere at the focus to create a strongly enhanced evanescent optical "needle" field that is substantially polarized vertically to the plasmonic lens surface. The field enhancement factor can be improved through adding more r...

Tuning the Electronic Coupling and Magnetic Moment of a Metal Nanoparticle Dimer in the Nonlinear Dielectric-Response Regime.

Nano Letters — Fri, 30 Oct 2009 00:00:00 +0100

Authors: Troparevsky MC, Zhao K, Xiao D, Zhang Z, Eguiluz AG We show that the electronic coupling and magnetic moment of a silver nanoparticle dimer can be readily tuned by applying an electric field in the nonlinear dielectric-response regime. For a given interparticle separation, the electronic coupling becomes tunable as soon as the system crosses over from the linear to nonlinear regime. Remarkably, this transition takes place for modest strengths of the electric field. Further increase of the field strength may close the HOMO-LUMO gap of the dimer due to Stark shifts, accompanied by the emergence of a net magnetic moment from two nonmagnetic building blocks. These findings, obtained within density functional theory, exhibit the delicate coupling between the electronic and magnetic...

Silver nanoparticles inhibit VEGF-and IL-1beta-induced vascular permeability via Src dependent pathway in porcine retinal endothelial cells

Journal of Nanobiotechnology — Fri, 30 Oct 2009 00:00:00 +0100

We report that VEGF and IL-1beta-stimulate endothelial permeability via Src dependent pathway by increasing the Src phosphorylation and Ag-NP block the VEGF-and IL-1beta-induced Src phosphorylation at Y419. These results demonstrate that Ag-NP may inhibit the VEGF-and IL-1beta-induced permeability through inactivation of Src kinase pathway and this pathway may represent a potential therapeutic target to inhibit the ocular diseases such as diabetic retinopathy. (Source: Journal of Nanobiotechnology)

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Nanotechnology in the design of soft tissue scaffolds: innovations in structure and function

Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology — Fri, 30 Oct 2009 00:00:00 +0100

This article reviews the major nanofiber fabrication technologies as well as delves into recent significant contributions to the conception of a meaningful and practical electrospun scaffold. Copyright © 2009 John Wiley & Sons, Inc.For further resources related to this article, please visit the . (Source: Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology)

International Conference on Nanoscience and Nanotechnology(ICONN2010)

Nanotechweb.org Events — Fri, 30 Oct 2009 00:00:00 +0100

Conference/exhibition: 24 Feb 2010 - 26 Feb 2020, Chennai, Tamilnadu, India. Organized by SRM University,India. (Source: Nanotechweb.org Events)

Debottlenecking Downstream Operations through Real-Time Re-Use Verification

Nanotechweb.org Events — Fri, 30 Oct 2009 00:00:00 +0100

Conference: 18 Nov 2009, United States. Organized by ComplianceOnline. (Source: Nanotechweb.org Events)

The Microbiology Lab’s Role in Contamination Control Support of Manufacturing

Nanotechweb.org Events — Fri, 30 Oct 2009 00:00:00 +0100

Conference: 17 Nov 0009, United States. Organized by ComplianceOnline. (Source: Nanotechweb.org Events)

Implement Key Validation for Chromatographic Methods

Nanotechweb.org Events — Fri, 30 Oct 2009 00:00:00 +0100

Conference: 3 Nov 2009, United States. Organized by complianceOnline. (Source: Nanotechweb.org Events)

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Tomatoes Get Nano Enhancement

NanoFocus — Thu, 29 Oct 2009 16:25:25 +0100

Sprinkling soil mix with carbon nanotubes boosts tomato plants' germination and growth rates, with implications for agriculture. (Source: NanoFocus)

Inhaled Nanotubes Reach Lung Lining In Mice

NanoFocus — Thu, 29 Oct 2009 16:25:25 +0100

Nanotoxicology: Carbon structures cause unique physiological effects, study shows. (Source: NanoFocus)

Graphene transfer for transparent electronics

Nanotechweb.org News — Thu, 29 Oct 2009 16:14:24 +0100

New technique could help make photovoltaic devices and flat panel displays (Source: Nanotechweb.org News)

Monodisperse Upconverting Nanocrystals by Microwave-Assisted Synthesis

ACS Nano — Thu, 29 Oct 2009 13:38:56 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Got TiO2 Nanotubes? Lithium Ion Intercalation Can Boost Their Photoelectrochemical Performance

ACS Nano — Thu, 29 Oct 2009 13:38:14 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Characteristic Energies and Shifts in Optical Spectra of Colloidal IV−VI Semiconductor Nanocrystals

ACS Nano — Thu, 29 Oct 2009 13:37:04 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Carbon Nanotube Photo- and Electroluminescence in Longitudinal Electric Fields

ACS Nano — Thu, 29 Oct 2009 13:35:26 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Capturing Electrochemically Evolved Nanobubbles by Electroless Deposition. A Facile Route to the Synthesis of Hollow Nanoparticles.

Nano Letters — Thu, 29 Oct 2009 00:00:00 +0100

Authors: Huang C, Jiang J, Lu M, Sun L, Meletis EI, Hao Y Gas evolution during electrochemical deposition has long been regarded as undesired and deliberately suppressed. Here, we show a new role of electrochemically evolved hydrogen bubbles, serving as both templates and reducing agent to form hollow Au nanoparticles via electroless deposition. Hollow gold nanoparticles with a complete nanocrystalline shell and a 50 nm hollow core were fabricated. By controlling the shell thickness, particle size can be varied from 100 to 150 nm. The process is very simple, scalable, and with a high throughput. Using this method, more complicated hollow nanostructures such as double nanoshells ("nanomatryoshka") can also be synthesized. These hollow nanoparticles possess desirable plasmonic properties...

Probing dynamic fluorescence properties of single and clustered quantum dots toward quantitative biomedical imaging of cells

Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology — Thu, 29 Oct 2009 00:00:00 +0100

We present results on the dynamic fluorescence properties of bioconjugated nanocrystals or quantum dots (QDs) in different chemical and physical environments. A variety of QD samples was prepared and compared: isolated individual QDs, QD aggregates, and QDs conjugated to other nanoscale materials, such as single-wall carbon nanotubes (SWCNTs) and human erythrocyte plasma membrane proteins. We discuss plausible scenarios to explain the results obtained for the fluorescence characteristics of QDs in these samples, especially for the excitation time-dependent fluorescence emission from clustered QDs. We also qualitatively demonstrate enhanced fluorescence emission signals from clustered QDs and deduce that the band 3 membrane proteins in erythrocytes are clustered. This approach is promising ...

Label-Free Raman Spectral Imaging of Intracellular Delivery and Degradation of Polymeric Nanoparticle Systems

ACS Nano — Wed, 28 Oct 2009 17:26:10 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Photoluminescent Diamond Nanoparticles for Cell Labeling: Study of the Uptake Mechanism in Mammalian Cells

ACS Nano — Wed, 28 Oct 2009 17:24:49 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Spin Polarized Conductance in Hybrid Graphene Nanoribbons Using 5−7 Defects

ACS Nano — Wed, 28 Oct 2009 17:24:14 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Water-dispersible magnetic metallic nanoparticles get smaller

Nanotechweb.org journal highlights — Wed, 28 Oct 2009 16:20:42 +0100

Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium (Source: Nanotechweb.org journal highlights)

Nanoclusters of Gold on a High-Area Support: Almost Uniform Nanoclusters Imaged by Scanning Transmission Electron Microscopy

ACS Nano — Wed, 28 Oct 2009 15:40:49 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Enhance or quench? Array structures influence QDs

Nanotechweb.org journal highlights — Wed, 28 Oct 2009 09:27:49 +0100

Imaging technique reveals how quantum dot (QD) fluorescence is influenced by spatially controlled array structures (Source: Nanotechweb.org journal highlights)

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Nanogap enhances scattering intensity of optical antennas

Nanotechweb.org journal highlights — Wed, 28 Oct 2009 09:25:09 +0100

Stronger far-field behaviour could benefit solar cells and optical sensing devices (Source: Nanotechweb.org journal highlights)

Plasmonic Ratchet Wheels: Switching Circular Dichroism by Arranging Chiral Nanostructures.

Nano Letters — Wed, 28 Oct 2009 00:00:00 +0100

Authors: Valev VK, Smisdom N, Silhanek AV, De Clercq B, Gillijns W, Ameloot M, Moshchalkov VV, Verbiest T We demonstrate circular dichroism (CD) in the second harmonic generation (SHG) signal from chiral assemblies of G-shaped nanostructures made of gold. The arrangement of the G shapes is crucial since upon reordering them the SHG-CD effect disappears. Microscopy reveals SHG "hotspots" assemblies, which originate in enantiomerically sensitive plasmon modes, having the novel property of exhibiting a chiral geometry themselves in relation with the handedness of the material. These results open new frontiers in studying chirality. PMID: 19863052 [PubMed - as supplied by publisher] (Source: Nano Letters)

Anomalous Dissipation in Single-Walled Carbon Nanotube Resonators.

Nano Letters — Wed, 28 Oct 2009 00:00:00 +0100

Authors: Greaney PA, Lani G, Cicero G, Grossman JC We observe a new anomalous and transient process of intrinsic dissipation in simulations of the ring-down of flexural modes in single-walled carbon nanotube (CNT) resonators. The effect is pronounced, causing the quality factor of the mode to be reduced by more that 95% for tens of picoseconds. The anomalous dissipation depends on the CNT temperature and the energy in the mode, and remarkably increasing the excitation energy in the resonator causes it to decay to zero faster. By tracking the cascade of energy as it dissipates we identify "gateway" modes that provide important channels for dissipation. The processes we observe show that an athermal phonon population accompanying dissipation can strongly influence the quality factor in n...

Non-viral gene therapy for myocardial engineering

Wiley Interdisciplinary Reviews: Nanomedicine and Nanobiotechnology — Wed, 28 Oct 2009 00:00:00 +0100

Despite significant advances in surgical and pharmacological techniques, myocardial infarction (MI) remains the main cause of morbidity in the developed world because no remedy has been found for the regeneration of infarcted myocardium. Once the blood supply to the area in question is interrupted, the inflammatory cascade, among other mechanisms, results in the damaged tissue becoming a scar. The goals of cardiac gene therapy are essentially to minimize damage, to promote regeneration, or some combination thereof. While the vector is, in theory, less important than the gene being delivered, the choice of vector can have a significant impact. Viral therapies can have very high transfection efficiencies, but disadvantages include immunogenicity, retroviral-mediated insertional mutagenesis, ...

Azafullerene-like Nanosized Clusters

ACS Nano — Tue, 27 Oct 2009 16:41:29 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

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Size-Focusing Synthesis, Optical and Electrochemical Properties of Monodisperse Au38(SC2H4Ph)24 Nanoclusters

ACS Nano — Tue, 27 Oct 2009 13:47:37 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

A Semi-Synthetic Ion Channel Platform for Detection of Phosphatase and Protease Activity

ACS Nano — Tue, 27 Oct 2009 13:45:13 +0100

ACS Nano, Volume 0, Issue 0, Articles ASAP (As Soon As Publishable). (Source: ACS Nano)

Ubiquitous Sensors: When Will They Be Here?

ACS Nano — Tue, 27 Oct 2009 04:00:00 +0100

ACS Nano, Volume 3, Issue 10, Page 2876-2880, October 27, 2009. (Source: ACS Nano)

Pearls of Wisdom: Stringing Nanoparticles and Polymers into New Assemblies and Materials

ACS Nano — Tue, 27 Oct 2009 04:00:00 +0100

ACS Nano, Volume 3, Issue 10, Page 2870-2875, October 27, 2009. (Source: ACS Nano)

Surface-Enhanced Raman Spectroscopy and Homeland Security: A Perfect Match?

ACS Nano — Tue, 27 Oct 2009 04:00:00 +0100

ACS Nano, Volume 3, Issue 10, Page 2859-2869, October 27, 2009. (Source: ACS Nano)

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In Nano

ACS Nano — Tue, 27 Oct 2009 04:00:00 +0100

ACS Nano, Volume 3, Issue 10, Page 2857-2858, October 27, 2009. (Source: ACS Nano)

Politics and Nanotechnology in the Health Care Industry

ACS Nano — Tue, 27 Oct 2009 04:00:00 +0100

ACS Nano, Volume 3, Issue 10, Page 2855-2856, October 27, 2009. (Source: ACS Nano)

Transfer-Free Batch Fabrication of Single Layer Graphene Transistors.

Nano Letters — Tue, 27 Oct 2009 00:00:00 +0100

We report the synthesis of large scale single layer graphene directly onto an evaporated copper film. A novel fabrication method was used to directly pattern these graphene sheets into devices by simply removing the underlying copper film. Raman and conductance measurements show that the mechanical and electrical properties of our single layer graphene are uniform over a large area, ( Ferrari , A. C. et al. Phys. Rev. Lett. 2006 , 97 , 187401. ) which leads to a high device yield and successful fabrication of ultra long (>0.5 mm) graphene channels. Our graphene based devices present excellent electrical properties including a promising carrier mobility of 700 cm(2)/V.s and current saturation characteristics similar to devices based on exfoliated graphene ( Meric , I. . et al. Nat Nanote...

Intracellular Processing of Proteins Mediated by Biodegradable Polyelectrolyte Capsules.

Nano Letters — Tue, 27 Oct 2009 00:00:00 +0100

Authors: Rivera-Gil P, De Koker S, De Geest BG, Parak WJ Multilayer polyelectrolyte capsules made by layer-by-layer assembly of oppositely charged biodegradable polyelectrolytes were filled with a model of a nonactive prodrug, a self-quenched fluorescence-labeled protein. After capsule uptake by living cells, the walls of the capsules were actively degraded and digested by intracellular proteases. Upon capsule wall degradation, intracellular proteases could reach the protein cargo in the cavity of the capsules. Enzymatic fragmentation of the self-quenched fluorescence-labeled protein by proteases led to individual fluorescence-labeled peptides and thus revoked self-quenching of the dye. In this way nonactive (nonfluorescent) molecules were converted into active (fluorescent) molecules....