Examination of Ostwald ripening in the photocatalytic growth of silver nanoparticles on titanium dioxide coatings

2016 ◽  
Vol 373 ◽  
pp. 38-44 ◽  
Author(s):  
Ireneusz Piwoński ◽  
Kaja Spilarewicz-Stanek ◽  
Aneta Kisielewska ◽  
Kinga Kądzioła ◽  
Michał Cichomski ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Ostwald Ripening

Preparation of Triangular Silver Nanoparticles Using Polyvinyl Pyrrolidone with Different Concentration

2013 ◽  
Vol 873 ◽  
pp. 206-210
Author(s):  
Kai Li ◽  
Rao Fu ◽  
Qing Ran Gao ◽  
Ai Wei Tang ◽  
Ying Feng Wang
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Silver Nanoparticles ◽  
Driving Force ◽  
Ostwald Ripening ◽  
Polyvinyl Pyrrolidone ◽  
Protective Agent ◽  
Ag Nps ◽  
Transmission Electron ◽  
Uv Visible

This paper continues our previous work on preparation of triangular silver nanoparticles. The method proceeds with reaction of silver nitrate with hydrazine hydrate in the presence of polyvinyl pyrrolidone in aqueous solution. Effects of the concentration of PVP on the morphologies of Ag NPs were systematically investigated. The obtained Ag NPs were characterized by transmission electron microscopy and UV-visible spectrophotometer. The results showed that, triangular Ag NPs with edge lengths in the range of 50-200 nm were obtained using PVP as protective agent with lower concentration. As the concentration of PVP increased, spherical Ag NPs with their sizes about 6.2 nm were prepared and triangular Ag NPs were not obtained. The formation mechanism of triangular Ag NPs has been studied. Ostwald ripening is the driving force on the conversion of spherical Ag NPs to triangular Ag NPs in the presence of PVP.

Titanium dioxide and modified titanium dioxide by silver nanoparticles as an anti biofilm filler content for composite resins

2019 ◽  
Vol 35 (2) ◽  
pp. e36-e46 ◽  
Author(s):  
Hércules Bezerra Dias ◽  
Maria Inês Basso Bernardi ◽  
Taís Maria Bauab ◽  
Antônio Carlos Hernandes ◽  
Alessandra Nara de Souza Rastelli
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Filler Content ◽  
Composite Resins

Photoluminescence of nanocrystalline titanium dioxide films loaded with silver nanoparticles

2011 ◽  
Vol 109 (8) ◽  
pp. 083528 ◽  
Author(s):  
Jana Preclíková ◽  
Pavel Galář ◽  
František Trojánek ◽  
Bohuslav Rezek ◽  
Yvonne Němcová ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Titanium Dioxide Films ◽  
Nanocrystalline Titanium ◽  
Nanocrystalline Titanium Dioxide

scholarly journals Titanium Dioxide Nanoparticles Elicit Lower Direct Inhibitory Effect on Human Gut Microbiota Than Silver Nanoparticles

2019 ◽  
Vol 172 (2) ◽  
pp. 411-416 ◽  
Author(s):  
Richard T Agans ◽  
Alex Gordon ◽  
Saber Hussain ◽  
Oleg Paliy
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Gut Microbiota ◽  
Titanium Dioxide Nanoparticles ◽  
Close Association ◽  
Community Diversity ◽  
Bacterial Cells ◽  
Human Gut ◽  
Human Gut Microbiota

Abstract Due to continued technological development, people increasingly come in contact with engineered nanomaterials (ENMs) that are now used in foods and many industrial applications. Many ENMs have historically been shown to possess antimicrobial properties, which has sparked concern for how dietary nanomaterials impact gastrointestinal health via microbial dysbiosis. We employed an in vitro Human Gut Simulator system to examine interactions of dietary nano titanium dioxide (TiO2) with human gut microbiota. Electron microscopy indicated a close association of TiO2 particles with bacterial cells. Addition of TiO2 to microbial communities led to a modest reduction in community density but had no impact on community diversity and evenness. In contrast, administration of known antimicrobial silver nanoparticles (NPs) in a control experiment resulted in a drastic reduction of population density. In both cases, communities recovered once the addition of nanomaterials was ceased. Constrained ordination analysis of community profiles revealed that simulated colonic region was the primary determinant of microbiota composition. Accordingly, predicted community functional capacity and measured production of short-chain fatty acids were not changed significantly upon microbiota exposure to TiO2. We conclude that tested TiO2 NPs have limited direct effect on human gut microbiota.

Impacts of titanium dioxide nanoparticles on transformation of silver nanoparticles in aquatic environments

2018 ◽  
Vol 5 (5) ◽  
pp. 1191-1199 ◽  
Author(s):  
Yinqing Zhang ◽  
Liwen Qiang ◽  
Yuting Yuan ◽  
Wei Wu ◽  
Binbin Sun ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Aquatic Environments ◽  
Oxidative Dissolution ◽  
Sunlight Irradiation

Under sunlight irradiation, titanium dioxide nanoparticles could promote the oxidative dissolution of silver nanoparticles in aquatic environments.

Evolution Analysis of Silver Nanoparticles Synthesised by Lactam Reduction: A Case Study of ϵ-Caprolactam

2018 ◽  
Vol 71 (8) ◽  
pp. 587 ◽  
Author(s):  
Na Zhang ◽  
Jianping Duan ◽  
Dajiang Zhao ◽  
Guisheng Yang
Keyword(s):  
Silver Nanoparticles ◽  
Size Distribution ◽  
Ostwald Ripening ◽  
Silver Ions ◽  
Reducing Agents ◽  
Ag Nps ◽  
Second Stage ◽  
Evolution Analysis ◽  
Ostwald Ripening Mechanism

Without using protecting agent and solvent, silver nanoparticles (Ag NPs) were synthesised by using lactams as reducing agents. Being the most commercially available lactam, ϵ-caprolactam (CL) was taken as a model to illustrate the evolution of Ag NPs in the medium of lactams. The results showed that there were two different stages involved in the Ag NP evolution process. In the first stage, particles were stabilised against further coalescence at a smaller size (< 5 nm) because of face-bound CL. In the second stage, the Ostwald ripening mechanism cooperated with continuous reduction of residual silver ions, which resulted in the resultant particles being distributed with different size distribution. The participation of CL in the reducing and protecting procedures raised a complex evolution of Ag NPs.

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