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Melting and freezing temperatures of confined Bi nanoparticles over a wide size range
The size dependences of the melting and freezing temperatures, Tm and Tf, respectively, of spherical Bi nanoparticles embedded in a sodium borate glass were determined by applying a new experimental procedure based on the combined and simultaneous use of small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). This experimental procedure is particularly useful for materials in which a widely polydisperse set of nanoparticles are embedded. The results provide additional and stronger evidence supporting the main previous conclusions: (i) the melting and freezing temperatures both decrease linearly for incr...
Source: Journal of Applied Crystallography - October 11, 2017 Category: Physics Authors: Degenhardt, H.F. Kellermann, G. Craievich, A.F. Tags: small-angle X-ray scattering nanocrystals wide-angle X-ray scattering melting crystallization nanoparticles research papers Source Type: research
Determination of the melting temperature of spherical nanoparticles in dilute solution as a function of their radius by exclusively using the small-angle X-ray scattering technique
In this investigation the dependence on radius of the melting temperature of dilute sets of spherical nanocrystals with wide radius distributions was determined by a novel procedure exclusively using the results of small-angle X-ray scattering (SAXS) measurements. This procedure is based on the sensitivity of the SAXS function to small and rather sharp variations in the size and electron density of nanocrystals at their melting temperature. The input for this procedure is a set of experimental SAXS intensity functions at selected q values for varying sample temperatures. In practice, the sample is heated from a minimum tem...
Source: Journal of Applied Crystallography - March 24, 2020 Category: Physics Authors: Kellermann, G. Pereira, F.L.C. Craievich, A.F. Tags: small-angle X-ray scattering SAXS melting nanoparticles thermal expansion size-dependent contraction research papers Source Type: research
Selenite bioreduction with concomitant green synthesis of selenium nanoparticles by a selenite resistant EPS and siderophore producing terrestrial bacterium
Biometals. 2023 Apr 29. doi: 10.1007/s10534-023-00503-y. Online ahead of print.ABSTRACTEnvironmental bacterial isolates play a very important role in bioremediation of metals and toxic metalloids. A bacterial strain with high selenite (SeO32-) tolerance and reducing capability was isolated from electronic waste dump site in Banaras Hindu University, Varanasi, India. Based on 16 S rRNA sequencing and BLAST search, this bacterial isolate was identified as Bacillus paramycoides and designated as strain MF-14. It tolerated Sodium selenite up to 110 mM when grown aerobically in LB broth and reduced selenite into elemental selen...
Source: Biometals - April 29, 2023 Category: Biochemistry Authors: Pooja Yadav Shraddha Pandey Santosh Kumar Dubey Source Type: research
Molecules, Vol. 28, Pages 3931: Comparative Analysis of Stable Gold Nanoparticles Synthesized Using Sonochemical and Reduction Methods for Antibacterial Activity
This study focuses on the influence of synthetic methods on the aggregation stability and antibacterial activity of gold nanoparticles (NPs) prepared by using sodium citrate as a reducing and capping agent against Staphylococcus aureus (S. aureus). Gold NPs were synthesized using a simple and rapid sonochemical method and compared to gold NPs synthesized using a reduction method. The physicochemical features of gold NPs were characterized using UV-vis, XRD, TEM, and zeta potential, and the TEM results showed that the sonochemical method produced monodispersed spherical gold NPs with an average diameter of 18.5 nm, while th...
Source: Molecules - May 6, 2023 Category: Chemistry Authors: Mohammed Ali Dheyab Azlan Abdul Aziz Nazila Oladzadabbasabadi Alyaa Alsaedi Farhank Saber Braim Mahmood S. Jameel Asmeit Ramizy Mohammad Alrosan Ali Madi Almajwal Tags: Article Source Type: research
Preparation of mucoadhesive methacrylated chitosan nanoparticles for delivery of ciprofloxacin
In this study, different experimental conditions including the polymer to TPP mass ratios, NaCl, and TPP concentration were changed to achieve unmodified and MeCHI nanoparticles with the smallest particle size and lowest polydispersity index. At 4:1 polymer /TPP mass ratio, both chitosan and MeCHI nanoparticles had the smallest size (133 ± 5 nm and 206 ± 9 nm, respectively). MeCHI nanoparticles were generally larger and slightly more polydisperse than the unmodified chitosan nanoparticles. Ciprofloxacin-loaded MeCHI nanoparticles had the highest encapsulation efficiency (69 ± 13 %) at 4:1 MeCHI /TPP mass ratio and 0.5 m...
Source: International Journal of Biological Macromolecules - May 26, 2023 Category: Biochemistry Authors: Renas Rzgar Jalal Twana Mohammed M Ways Mahmoud H Abu Elella Diyar Ahmed Hassan Vitaliy V Khutoryanskiy Source Type: research
Assessment of Exenatide loaded Biotinylated Trimethylated Chitosan/HP-55 Nanoparticles
CONCLUSION: Bio-TMC/HP-55 nanoparticles are feasible as oral drug carriers of exenatide and have the potential to be extended to other drugs that are not readily oral, such as monoclonal antibodies, vaccines, genes, etc., thus, this would be beneficial for pharmaceutical industries. Further research will focus on the biodistribution of Bio-TMC/HP-55 nanoparticles after oral administration.PMID:34126896 | DOI:10.2174/1567201818666210614100603
Source: Current Drug Delivery - June 15, 2021 Category: Drugs & Pharmacology Authors: Hejian Guo Xuehui Yan Hao Tang Xiaoyan Zhang Source Type: research
