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Total 3421 results found since Jan 2013.

Boosting Polyethylene Hydrogenolysis Performance of Ru ‐CeO2 Catalysts by Finely Regulating the Ru Sizes
In this study, it is discovered that the activity of CeO2-supported Ru single atom, nanocluster, and nanoparticle catalysts shows a volcanic trend in low-density polyethylene (LDPE) hydrogenolysis. Compared with CeO2 supported Ru single atoms and nanoparticles, CeO2-supported Ru nanoclusters possess the highest conversion efficiency, as well as the best selectivity toward liquid alkanes. Through comprehensive investigations, the metal-support interactions (MSI) and hydrogen spillover effect are revealed as the two key factors in the reaction. On the one hand, the MSI is strongly related to the Ru surface states and the mor...
Source: Small - April 25, 2023 Category: Nanotechnology Authors: Hongyan Ji, Xiao Wang, Xiaoxu Wei, Yuxuan Peng, Shuaishuai Zhang, Shuyan Song, Hongjie Zhang Tags: Research Article Source Type: research

Gelothermal Synthesis of Monodisperse MIL ‐88A Nanoparticles with Tunable Sizes and Metal Centers for Potential Bioapplications
Gelothermal synthesis is proposed to prepare monodisperse MIL-88A nanoparticles, in which the particle size can be well-tuned from nanoscale to microscale without significant changes in PDI even in the case of in-situ metal substitution. The unique advantages of monodisperse nanoparticles is demonstrated over polydisperse ones in terms of magnetic resonance imaging, cellular uptake, and drug-carrying for potential bioapplications. AbstractDeveloping novel synthetic strategies to downsize metal-organic frameworks (MOFs) from polydisperse crystals to monodisperse nanoparticles is of great importance for their potential bioap...
Source: Small - April 24, 2023 Category: Nanotechnology Authors: Mengmeng Zhang, Mingzhu Lu, Tianze Qiu, Qiao Wang, Zhenxia Chen, Mingli Deng, Yongtai Yang, Yannan Yang, Wei Li, Yun Ling, Yaming Zhou Tags: Research Article Source Type: research

Identifying the Structure of Supported Metal Catalysts Using Vibrational Fingerprints from Ab Initio Nanoscale Models
Anharmonic infrared spectra of adsorbed carbon monoxide are simulated by density functional theory to identify the nature of palladium nanoparticles supported on ceria, from a comparison with in-situ diffuse reflectance infrared Fourier transform spectroscopy measurements. A model of truncated octahedral nanoparticle of 1.5 nm of diameter covered by a large coverage of carbon monoxide is representative of spectroscopic experiments. AbstractIdentifying active sites of supported noble metal nanocatalysts remains challenging, since their size and shape undergo changes depending on the support, temperature, and gas mixture com...
Source: Small - April 24, 2023 Category: Nanotechnology Authors: Agustin Salcedo, Deniz Zengel, Florian Maurer, Maria Casapu, Jan ‐Dierk Grunwaldt, Carine Michel, David Loffreda Tags: Research Article Source Type: research

Highly Stable Potassium Metal Anodes with Controllable Thickness and Area Capacity
K metal anodes with thin thickness (10 –200 µm) and fixed area capacity (0.47–3.54 mAh cm-2) can be fabricated by changing the raw material mass and graphene layer spacing of rGCA. Moreover, the K metal composite anodes (rGCA-K) based on the multi-functional skeleton can effectively suppress dendrites and exhibit excellent electrochemical performance in symmetric and full cells. AbstractK metal battery is a kind of high-energy-density storage device with economic advantages. However, due to the dendrite growth and difficult processing characteristics, it is difficult to prepare stable K metal anode with thin thickness...
Source: Small - April 24, 2023 Category: Nanotechnology Authors: Jiaheng Zhang, Dan Cai, Liping Zhu, Xiuli Wang, Jiangping Tu Tags: Research Article Source Type: research

Multi ‐Responsive Supercapacitors from Chiral Nematic Cellulose Nanocrystal‐Based Activated Carbon Aerogels
Magnetically-active supercapacitor materials are developed from chiral nematic structures through the combination of cellulose nanocrystals and ex situ synthesized iron- and cobalt-oxide nanoparticles. Obtained microporous/mesoporous materials are hierarchically arranged to combine high specific surface areas, large magnetization values and competitive specific capacitances, providing a base for advanced sensing, actuator or energy storage applications beyond conventional petroleum-based materials. AbstractThe development of long-lived electrochemical energy storage systems based on renewable materials is integral for the ...
Source: Small - April 24, 2023 Category: Nanotechnology Authors: Lucas J. Andrew, Emma R. Gillman, Christopher M. Walters, Erlantz Lizundia, Mark J. MacLachlan Tags: Research Article Source Type: research

Octahedral/Tetrahedral Vacancies in Fe3O4 as K ‐Storage Sites: A Case of Anti‐Spinel Structure Material Serving as High‐Performance Anodes for PIBs
Here, a novel carbon-coated anti-spinel structure ferroferric oxide (Fe3O4@C) anode is prepared, whose unoccupied octahedral and tetrahedral vacancies are shown to serve as favorable potassium storage sites. Based on this, the Fe3O4@C shows outstanding performance with a high specific capacity of 638 mAh g−1 at 0.05 A g−1 and hyperstable cycling stability at 2 A g−1 and 10 A g−1. AbstractPotassium-ion batteries (PIBs) have attracted more and more attention as viable alternatives to lithium-ion batteries (LIBs) due to the deficiency and uneven distribution of lithium resources. However, it is shown that potassium st...
Source: Small - April 22, 2023 Category: Nanotechnology Authors: Jinwei Tu, Huigang Tong, Peichen Wang, Dongdong Wang, Yang Yang, Xiangfu Meng, Lin Hu, Hui Wang, Qianwang Chen Tags: Research Article Source Type: research

Shaping Copper Oxide Layers on Gold Nanoparticle Ensembles by Controlled Electrodeposition with Single Particle Scatterometry
Copper oxide layers are grown uniformly on gold nanoelectrode ensembles by electrodeposition, where the final morphologies are varied by particle density and symmetry. The non-classical multi-step growth processes are resolved using in situ scatterometry and ex situ imaging at a single particle level. AbstractElectrodeposition of copper on gold nanoelectrode ensembles result in the formation of uniform copper oxide layers on individual nanoparticles. A linear sweep of voltammetric change induces three distinct morphologies dependent upon particle density. Ex situ imaging and in situ scatterometry at a single-particle level...
Source: Small - April 22, 2023 Category: Nanotechnology Authors: Hyunsik Hwang, Hyuncheol Oh, Hyunjoon Song Tags: Research Article Source Type: research

Synthesis of Free ‐Standing Pd‐Ni‐P Metallic Glass Nanoparticles with Durable Medium‐Range Ordered Structure for Enhanced Electrocatalytic Properties
In this work, a novel laser-evaporated inert-gas condensation (LE-IGC) method is developed for synthesizing free-standing metallic glass nanoparticles, exhibiting good electrocatalytic performance in oxygen reduction reactions. Short-range order cluster connection motifs transform from face-sharing to edge-sharing modes during cyclic voltammetry cycles, enhancing the electrochemical stability by suppressing the formation of long-range ordered structures. AbstractTopologically disordered metallic glass nanoparticles (MGNPs) with highly active and tailorable surface chemistries have immense potential for functional uses. The...
Source: Small - April 21, 2023 Category: Nanotechnology Authors: Shu Fu, Guo ‐Xing Chen, Hu Guo, Sinan Liu, Mengyang Yan, Yu Lou, Huiqiang Ying, Zhongzheng Yao, Yang Ren, Wei Jiang, He Zhu, Horst Hahn, Tao Feng, Si Lan Tags: Research Article Source Type: research

Supramolecular Chemistry of Carbon ‐Based Dots Offers Widespread Opportunities
Carbon dots are photoluminescent carbon nanoparticles smaller than 10  nm with a carbonaceous core and various functional groups at their surface. Non-covalent interactions (electrostatic interactions, coordinative bonds, hydrogen bonds, ππ stacking, and hydrophobic interactions) have been used to prepare functional carbon dots-based assemblies and have been employed in sensing, (bio)imaging, therapeutic applications, catalysis, and preparation of devices. AbstractCarbon dots are an emerging class of nanomaterials that has recently attracted considerable attention for applications that span from biomedicine to energ...
Source: Small - April 20, 2023 Category: Nanotechnology Authors: Francesca Arcudi, Luka Đorđević Tags: Review Source Type: research

Anchoring Pt Particles onto Mesoporousized ZnO Holey Cubes for Triethylamine Detection with Multifaceted Superiorities
Mesoporousized ZnO holey cubes were  fabricated by a simple spontaneous dissolution with subsequent thermal decomposition strategy, which have been functionalized with catalytic Pt nanoparticles to further enhance the sensing performance towards TEA detection. AbstractDesigning sensing materials with integrating unique spatial structures, functional units, and surface activity is vital to achieve high-performance gas sensor toward triethylamine (TEA) detection. Herein, a simple spontaneous dissolution is used with subsequent thermal decomposition strategy to fabricate mesoporousized ZnO holey cubes. The squaric acid is cr...
Source: Small - April 20, 2023 Category: Nanotechnology Authors: Chengjun Dong, Ruonan Tian, Honglong Qu, Huai Tan, Gang Chen, Hongtao Guan, Zongyou Yin Tags: Research Article Source Type: research

In Situ Mesopore Formation in SiOx Nanoparticles by Chemically Reinforced Heterointerface and Use of Chemical Prelithiation for Highly Reversible Lithium ‐Ion Battery Anode (Small 16/2023)
Highly Reversible Lithium-Ion Battery AnodesIn article number2206238, Sunho Jeong, Hyung-Seok Kim, and co-workers propose a synthesis method of SiOx composite for high-performance anode for lithium-ion batteries. Synthesized SiOx composite shows intact hybridization of nanoparticles with graphene oxide sheets, and mesopores which are formed spontaneously inside the nanoparticles in a thermal reduction process. These structural features of composite significantly improve the electrochemical properties of SiOx. In addition, the authors confirm the commercialization possibility of composite through prelithiation and full-cell test.
Source: Small - April 19, 2023 Category: Nanotechnology Authors: Sanghyuk Gong, Yeongje Lee, Jinkwan Choi, Minah Lee, Kyung Yoon Chung, Hun ‐Gi Jung, Sunho Jeong, Hyung‐Seok Kim Tags: Back Cover Source Type: research

Regulated Surface Electronic States of CuNi Nanoparticles through Metal ‐Support Interaction for Enhanced Electrocatalytic CO2 Reduction to Ethanol
CuNi@C/N-npG has been designed for CO2RR with superior ethanol selectivity of 96.6% at −0.78 V versus RHE. The stronger metal-support interaction increases the intrinsic activity and promotes the stability through the effective regulation of surface electronic structure and electron transfer during the catalytic process. The controllable transition of reaction intermediates improve s the activity and selectivity for ethanol production. AbstractDeveloping stable catalysts with higher selectivity and activity within a wide potential range is critical for efficiently converting CO2 to ethanol. Here, the carbon-encapsulated...
Source: Small - April 19, 2023 Category: Nanotechnology Authors: Kaiyue Zhang, Jing Wang, Weining Zhang, Hongfei Yin, Jiuhui Han, Xiaoyong Yang, Weiliu Fan, Yongzheng Zhang, Ping Zhang Tags: Research Article Source Type: research

Self ‐Limiting Sub‐5 nm Nanodiamonds by Geochemistry‐Inspired Synthesis
Precise control of nanodiamond (ND) sizes is crucial for both the fundamental understanding of their structure –property relationships and applications in imaging, therapeutics, and quantum information systems. State-of-the-art techniques, however, lack the mechanism to terminate ND growth at desired diameters. Here, a self-limiting strategy using well-defined nanoparticle precursors to achieve sub-5 nm ND s with sub-nanometer size deviation is reported. AbstractControlling diamond structures with nanometer precision is fundamentally challenging owing to their extreme and far-from-equilibrium synthetic conditions. State-...
Source: Small - April 19, 2023 Category: Nanotechnology Authors: Tengteng Lyu, Cynthia M. Archambault, Evan Hathaway, Xiangyu Zhu, Carol King, Lama Abu ‐Amara, Sicheng Wang, Martin Kunz, Moon J. Kim, Jingbiao Cui, Yansun Yao, Tony Yu, Timothy Officer, Man Xu, Yanbin Wang, Hao Yan Tags: Research Article Source Type: research

Silica ‐Functionalized Nanolimes for the Conservation of Stone Heritage
Silica-functionalized nanolime dispersions have been produced by a solvothermal high-yield procedure using calcium ethoxide as precursor for their use in the conservation of built and archaeological heritage. Such nanoparticles display unprecedented small size and high reactivity. Their application on a porous sandstone demonstrated an improved consolidation effectiveness due to the versatile chemical properties of the nanostructured silica/calcium silicate hydrate (CSH) coating these particles. AbstractThe relatively recent development of nanolimes (i.e., alcoholic dispersions of Ca(OH)2 nanoparticles) has paved the way f...
Source: Small - April 19, 2023 Category: Nanotechnology Authors: Miguel Burgos ‐Ruiz, Kerstin Elert, Encarnacion Ruiz‐Agudo, Helmut Cölfen, Carlos Rodriguez‐Navarro Tags: Research Article Source Type: research

Two ‐Dimensional Interlayer Space Induced Horizontal Transformation of Metal–Organic Framework Nanosheets for Highly Permeable Nanofiltration Membranes
A highly permeable Zn-TCPP/rGO composite membrane for efficient nanofiltration is fabricated by in situ transformation of well-distributed ZnO in the rGO laminate structure. The appropriate ZnO mass loading results in the optimized orientation of Zn-TCPP to expose the uniform in-plane pores as selective nanochannels for dye separation. AbstractLaminar membranes comprising graphene oxide (GO) and metal –organic framework (MOF) nanosheets benefit from the regular in-plane pores of MOF nanosheets and thus can support rapid water transport. However, the restacking and agglomeration of MOF nanosheets during typical vacuum fil...
Source: Small - April 19, 2023 Category: Nanotechnology Authors: Zheng Wang, Keizo Nakagawa, Kecheng Guan, Qiangqiang Song, Siyu Zhou, Shunsuke Tanaka, Yasunao Okamoto, Atsushi Matsuoka, Eiji Kamio, Guangchao Li, Molly Meng ‐Jung Li, Tomohisa Yoshioka, Hideto Matsuyama Tags: Research Article Source Type: research