scholarly journals Morphology and properties of silica-based coatings with different functionalities for Fe3O4, ZnO and Al2O3 nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (59) ◽  
pp. 48094-48103 ◽  
Author(s):  
D. Liu ◽  
A. M. Pourrahimi ◽  
L. K. H. Pallon ◽  
R. L. Andersson ◽  
M. S. Hedenqvist ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Single Step ◽  
Oxide Nanoparticles ◽  
Al2o3 Nanoparticles ◽  
Step Method

A facile single-step method for obtaining 2–3 nm thick silsesquioxane coatings on metal oxide nanoparticles using different carbon-functional silane precursors is presented.

scholarly journals Synthetic versatility of nanoparticles: A new, rapid, one-pot, single-step synthetic approach to spherical mesoporous (metal) oxide nanoparticles using supercritical alcohols

2014 ◽  
Vol 86 (5) ◽  
pp. 785-800 ◽  
Author(s):  
Pengyu Wang ◽  
Kazuya Kobiro
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Single Step ◽  
Oxide Nanoparticles ◽  
Synthetic Approach ◽  
Organic Additives ◽  
Step Method ◽  
One Pot ◽  
Mesoporous Metal ◽  
Mesoporous Metal Oxide

AbstractA simple, rapid (10 min), one-pot, single-step method for the preparation of solid and hollow spherical porous TiO2 nanoparticles with large surface areas (100–211 m2/g) was developed in supercritical alcohols using carboxylic acids as organic additives. The shell thickness of the hollow TiO2 nanoparticles (20–280 nm) was controlled by adjusting the heating rate (2.0–10.0 °C/min). The preparation of different spherical porous metal oxide nanoparticles, including CeO2, SiO2, TiO2, ZrO2, and ZnO, demonstrated the versatility of the synthetic approach. In addition, several rare earth-doped spherical mesoporous metal oxide nanoparticles, including CeO2:Er, CeO2:Er,Yb, ZrO2:Er, and TiO2:Er, which exhibit energy upconversion emission, were successfully prepared using this one-pot, single-step, supercritical methanol method. The obtained spherical mesoporous CeO2:Er and CeO2:Er,Yb nanoparticles emit green light upon excitation, even when irradiated with a low-power IR laser (980 nm, 10 mW) without calcination. Several other (metal) elements were also easily doped into spherical, mesoporous TiO2 nanoparticles, such as Eu, Ce, Yb, Fe, and N, using a similar procedure. Furthermore, the spherical mesoporous TiO2 nanoparticles were successfully applied as a new material for the transport of DNA via biolistic bombardment.

scholarly journals Structural, Morphological and Antimicrobial Study of ZnO/Ag Nanoparticles

2020 ◽  
Vol 13 (4) ◽  
pp. 1645-1652
Author(s):  
Richa Sharma ◽  
Suresh Kumar ◽  
Prem Singh ◽  
Shikha Kapila
Keyword(s):  
Metal Oxide ◽  
Ag Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Antibacterial Properties ◽  
Chemical Properties ◽  
Single Step ◽  
Oxide Nanoparticles ◽  
Bacterial Strains ◽  
X Ray ◽  
E Coli

Metal oxide nanoparticles gain attention in the field of biomedical applications because of their unique physico-chemical properties and emerging out as an alternative to antibiotics. The major cause of most of the human diseases is the bacterial infection. However, antibiotics used in the cure show other complications to human health. Therefore, the purpose of the present work is to investigate the antibacterial properties of ZnO/Ag nanoparticles on the test bacterial strains, Escherichia coli (E. coli). ZnO/Ag nanoparticles are synthesized using surfactant mediated route in a single step and double step procedure. Here, CTAB and hydrazine hydrate used as a surfactant and reducing agents respectively. The synthesized nanoparticles are characterized by x-ray diffraction, scanning electron microscopy and energy dispersive x-ray spectroscopy for structure, morphology and compositional properties. The antibacterial activities of these nanoparticles are also studied using the agar-well diffusion technique. The result analysis shows that synthesized nanopaticles are spherical in shape, having particles of the size 6 nm and 13 nm in the desired elemental composition. ZnO/Ag nanoparticles possessed a strong antibacterial effect against E. coli. This study signifies that ZnO/Ag metal oxide nanoparticles exhibit stronger antimicrobial activity against pathogen bacteria E. coli which may works effectively on the antibacterial and antifungal infections.

Star fruit extract-mediated green synthesis of metal oxide nanoparticles

2021 ◽  
pp. 1-8
Author(s):  
Sagadevan Suresh ◽  
Selvaraj Vennila ◽  
J. Anita Lett ◽  
Is Fatimah ◽  
Faruq Mohammad ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Green Synthesis ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Fruit Extract ◽  
Star Fruit

Quantum mechanics descriptors in a nano-QSAR model to predict metal oxide nanoparticles toxicity in human keratinous cells

2021 ◽  
Vol 23 (8) ◽  
Author(s):  
Eliecer Peláez Sifonte ◽  
Fidel Antonio Castro-Smirnov ◽  
Argenis Adrian Soutelo Jimenez ◽  
Héctor Raúl González Diez ◽  
Fernando Guzmán Martínez
Keyword(s):  
Quantum Mechanics ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Qsar Model ◽  
Oxide Nanoparticles ◽  
Nanoparticles Toxicity

scholarly journals Controlling the optical properties of nanostructured oxide-based polymer films

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
N. C. Angastiniotis ◽  
S. Christopoulos ◽  
K. C. Petallidou ◽  
A. M. Efstathiou ◽  
A. Othonos ◽  
...  
Keyword(s):  
Optical Properties ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Optimal Size ◽  
Specific Chemical ◽  
Nanostructured Oxide ◽  
Bulk Scale ◽  
Transmission And Reflection ◽  
Film Composites

AbstractA bulk scale process is implemented for the production of nanostructured film composites comprising unary or multi-component metal oxide nanoparticles dispersed in a suitable polymer matrix. The as-received nanoparticles, namely Al$$_2$$ 2 O$$_3$$ 3 , SiO$$_2$$ 2 and TiO$$_2$$ 2 and binary combinations, are treated following specific chemical and mechanical processes in order to be suspended at the optimal size and composition. Subsequently, a polymer extrusion technique is employed for the fabrication of each film, while the molten polymer is mixed with the treated metal oxide nanoparticles. Transmission and reflection measurements are performed in order to map the optical properties of the fabricated, nanostructured films in the UV, VIS and IR. The results substantiate the capability of the overall methodology to regulate the optical properties of the films depending on the type of nanoparticle formation which can be adjusted both in size and composition.

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