Differential genotoxicity of chemical properties and particle size of rare metal and metal oxide nanoparticles

2011 ◽  
Vol 32 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Go Hasegawa ◽  
Motoyuki Shimonaka ◽  
Yoko Ishihara
Keyword(s):  
Particle Size ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Rare Metal ◽  
Oxide Nanoparticles

scholarly journals Metal Oxide Nanoparticles and their Nanocomposite-based Materials as Photocatalysts in the Degradation of Dyes

2021 ◽  
Vol 12 (5) ◽  
pp. 6557-6579
Keyword(s):  
Metal Oxide ◽  
Anthropogenic Activities ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Cost Effective ◽  
Oxide Nanoparticles ◽  
Synthetic Dyes ◽  
Characterization Methods ◽  
Degradation Of Dyes ◽  
Physical And Chemical

The introduction of inorganic and organic pollutants into water bodies has become a serious issue globally. The waste streams released from the textile, plastic, leather, paper, pharmaceutical, and food industries introduce different natural and synthetic dyes into the aquatic system. Nanomaterials play a significant role in the photocatalytic degradation of dyes present in wastewater. Inorganic metal oxide nanoparticles have many improved physical and chemical properties and attracted much attention in photocatalytic activities. Dyes have been released in our aquatic bodies due to many anthropogenic activities and caused life-threatening problems. Various conventional methods were reported to remove dyes from water and wastewater; the photocatalytic method is one of the efficient and cost-effective. The present review article includes detailed information on photocatalysis, the potential of metal oxide and their composite materials as photocatalysts in the degradation of toxic dyes, and some common synthetic and characterization methods used for metal oxide-based nanoparticles.

scholarly journals Green Synthesis, Characterization & Antibacterial Studies of Silver (Ag) and Zinc Oxide (Zno) Nanoparticles

2020 ◽  
Vol 14 (3) ◽  
pp. 1999-2008
Author(s):  
H. Syed Jahangir ◽  
T. Tamil Kumar ◽  
M. Mary Concelia ◽  
R. Alamelu
Keyword(s):  
Zinc Oxide ◽  
Metal Oxide ◽  
Green Synthesis ◽  
Zno Nanoparticles ◽  
Size Structure ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Leaf Extracts

Green synthesis nanoparticles were considered as an alternative effective resource instead of chemically engineered metal oxide nanoparticles. Using leaf extracts for green synthesis, essential for the reduction and oxidation process of the metals. Phyllanthus niruri (L.) and Aristolochia indica (L.) leaf extracts were used to synthesize yellowish brown coloured silver (Ag) and white coloured zinc oxide (ZnO) nanoparticles. Synthesized green nanoparticles characterized by different spectroscopic analysis (XRD, XPS, FTIR, PL) and TEM. Characterization results confirmed the particles morphology, size, structure and also their optical and photonic properties. Three different concentrations of Ag and ZnO NPs were analysed against three (gram positive) and five (gram negative) bacteria. Increased levels of green synthesized Ag and ZnO NPs showed increased zone of inhibition than amoxicillin (positive control). Our study proved that the green synthesized Ag and ZnO NPs showed similar unique physical and chemical properties with metal oxide nanoparticles but less toxic while their discharge into the ecosystem.

scholarly journals A GREEN STRATEGY TO SYNTHESIZE ENVIRONMENT FRIENDLY METAL OXIDE NANOPARTICLES FOR POTENTIAL APPLICATIONS – A REVIEW

2017 ◽  
Vol 10 (13) ◽  
pp. 337
Author(s):  
G. Vinitha ◽  
P Vani ◽  
N Manikandan
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Oxide Nanoparticles ◽  
Potential Candidate ◽  
Aerospace Medicine ◽  
Energy And Environment ◽  
Potential Applications ◽  
New Research ◽  
Physical And Chemical

Chemical reducing and capping reagents are largely used in synthesizing metal oxide nanoparticles which limits the biomedical applications. Researchers have recently found out the eco-friendly technique of green synthesis which enhances the unique physical and chemical properties of nanomaterials. In this critique, we discuss green route to synthesize metal oxide nanoparticles and its significant applications in various fields of energy and environment, aerospace, medicine, biotechnology, etc.This study arouses to provoke new research design of approach to synthesize nanoparticles for various technological applications. In this review, most of the metal oxides nanoparticles with different plant extract with enhanced properties for its potential applications are discussed which confirms plant extracts as a potential candidate to be used as reducing and capping agent.

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.

scholarly journals Stability of metal oxide nanoparticles in aqueous solutions

2010 ◽  
Vol 61 (1) ◽  
pp. 127-133 ◽  
Author(s):  
Chih-ping Tso ◽  
Cheng-min Zhung ◽  
Yang-hsin Shih ◽  
Young-Ming Tseng ◽  
Shian-chee Wu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Aqueous Solutions ◽  
Human Health ◽  
Metal Oxide Nanoparticles ◽  
Chemical Properties ◽  
Oxide Nanoparticles ◽  
High Concentration ◽  
Organic Matters ◽  
The Stability ◽  
Micrometer Size

The application of nanoparticles in the processes of making commercial products has increased in recent years due to their unique physical and chemical properties. With increasing amount of commercial nanoparticles released into nature, their fate and effects on the ecosystem and human health are of growing concern. This study investigated the stability and morphology of three metal oxide nanoparticles in aqueous solutions. The commercially available nanoparticles, TiO2, ZnO, SiO2, aggregated quickly into micrometer-size particles in aqueous solutions, which may not threaten human health. Their changes in morphology and characteristics were further examined by dynamic light scattering (DLS) method and transmission electron microscopy (TEM). Among the several dispersion approaches, ultrasonication was found to be the most effective for disaggregating nanoparticles in water. For these three selected nanoparticles, ZnO could not remain stable in suspensions, presumably due to the dissolution of particles to form high concentration of ions, resulting in enhanced aggregation of particles. In addition, the existence of dissolved organic matters stabilized nanoparticles in lake water and wastewater for several hours in spite of the high concentration of cations in these real-water samples. The fate of metal oxide nanoparticles in natural water bodies would be determined by the type and concentration of cations and organic matters. Results obtained in this study revealed that the stability of nanoparticles changed under different aqueous conditions and so did their fate in the environment.

Elemental recoveries for metal oxide nanoparticles analysed by direct injection ICP-MS: influence of particle size, agglomeration state and sample matrix

2014 ◽  
Vol 29 (12) ◽  
pp. 2294-2301 ◽  
Author(s):  
Sylvie Motellier ◽  
Arnaud Guiot ◽  
Samuel Legros ◽  
Brice Fiorentino
Keyword(s):  
Particle Size ◽  
Metal Oxide ◽  
Direct Injection ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Sample Matrix ◽  
Icp Ms ◽  
Agglomeration State

Metal oxide nanoparticles were analyzed by ICP-MS with direct injection and their recoveries were determined in different media.

Thiol Adsorption on Metal Oxide Nanoparticles

2021 ◽  
Author(s):  
Owen Grimm ◽  
Dulanga Somaratne ◽  
Yiwen Wang ◽  
Sol Kim ◽  
James Whitten
Keyword(s):  
Particle Size ◽  
Metal Oxide ◽  
Primary Particle ◽  
Metal Oxide Nanoparticles ◽  
Primary Particle Size ◽  
Oxide Nanoparticles

The adsorption of 2-naphthalenethiol (2-NPT) and methanethiol (MT) on 13 different metal oxide nanoparticles, of approximately 30 nm average primary particle size, has been investigated. In the case of 2-NPT,...

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