scholarly journals Incorporation of ZnO nanoparticles in polymeric matrices as UV protector

2020 ◽  
pp. 7-12
Author(s):  
Erika MONTERO-GUZMAN ◽  
R. GALINDO ◽  
R. FUENTES-RAMIREZ
Keyword(s):  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Polymeric Materials ◽  
Ultraviolet Rays ◽  
Oxide Nanoparticles ◽  
Inorganic Pigments ◽  
New Materials ◽  
Polymeric Matrices ◽  
Emulsion Process

At present there is great interest in the development of new nanomaterials that can be applied in different areas of study such as chemistry, physics, medicine, among others. In many polymeric materials, especially when used in coatings exposed to sunlight, they cause photolysis and photooxidation reactions, leading to the degradation of their physical-mechanical, optical and other properties. Therefore, the need to look for new materials capable of resisting radiation for prolonged periods, while retaining its original characteristics, such as hue and brightness, is imperative. Zinc oxide nanoparticles have attracted great interest in this aspect as they are used in most commercial sunscreens that use inorganic pigments, for their ability to adsorb ultraviolet rays. In the present work, the incorporation of the Np-ZnO in situ during the polymerization by the emulsion process of butyl acrylate was carried out. ZnO nanoparticles are incorporated into butyl polyacrylate in different concentrations of 0.3%, 0.5%, and 1% W, in which it is observed that at 1% there is greater agglomeration and in the others it does not affect the morphology of our polymer.

Microbiote shift in sequencing batch reactors in response to antimicrobial ZnO nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 110108-110111 ◽  
Author(s):  
Zhenghui Liu ◽  
Huifang Zhou ◽  
Jiefeng Liu ◽  
Xudong Yin ◽  
Yufeng Mao ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Wastewater Treatment ◽  
Adverse Effects ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Wastewater Treatment Plants ◽  
Oxide Nanoparticles ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Zno Nps

Zinc oxide nanoparticles (ZnO NPs) have been monitored in wastewater treatment plants as their potential adverse effects on functional microorganisms have been causing increasing concern.

Raspberry-like morphology of polyvinyl chloride/zinc oxide nanoparticles induced by surface interaction and formation of nanoporous foam

RSC Advances ◽  
2015 ◽  
Vol 5 (46) ◽  
pp. 36845-36857 ◽  
Author(s):  
Tingting Ren ◽  
Jie Wang ◽  
Jinfeng Yuan ◽  
Mingwang Pan ◽  
Gang Liu ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Polyvinyl Chloride ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Surface Interaction ◽  
Oxide Nanoparticles ◽  
Nano Coating ◽  
Coating Method

P(VC-co-AAEM)/ZnO nanoparticles are prepared by a nano-coating method, and the morphology of the raspberry-like particles is adjusted by hydrophilicity and NaOH concentration.

scholarly journals Effects of Humic Acid and Natural Sunlight Irradiation on the Behaviour of Zinc Oxide Nanoparticles in the Aqueous Environment

2020 ◽  
Vol 11 (4) ◽  
pp. 11256-11271
Keyword(s):  
Humic Acid ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Large Scale ◽  
Aquatic Organisms ◽  
Consumer Products ◽  
Oxide Nanoparticles ◽  
Aqueous Environment ◽  
Sunlight Irradiation ◽  
Langmuir Isotherm Model

The unique properties of ZnO nanoparticles have attracted scientists’ interest to produce on a large-scale. Household items, cosmetics, consumer products, and electric sensors are some products that utilize these ZnO nanomaterials. Eventually, ZnO nanoparticles will be released into the environment in various ways. Once released, ZnO nanoparticles would dissociate into Zn2+ ions, which are toxic to aquatic organisms. The presence of humic acid and exposure to sunlight could affect the dissolution of ZnO nanoparticles. Two sizes of commercial ZnO nanoparticles (< 50 nm and < 100 nm) were chosen to study the influence of humic acid and sunlight on the dissolution. In the presence of humic acid, the dissolution of both sizes is higher, with 67 % and 39 % Zn2+ dissolved for < 50 nm and < 100 nm, respectively. The concentration of Zn2+ ions seems to be consistent or stable when exposed to sunlight. However, the humic acid enhanced the release of Zn2+ ions. Langmuir isotherm model best fitted for the humic acid's sorption onto the ZnO nanoparticles with the process been favorable.

Synthesis and Antimicrobial Properties of Zinc Oxide Nanoparticles

2020 ◽  
Vol 20 (10) ◽  
pp. 5977-5996 ◽  
Author(s):  
Saee Gharpure ◽  
Balaprasad Ankamwar
Keyword(s):  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Physical Contact ◽  
Oxide Nanoparticles ◽  
Synthesis Methods ◽  
Promising Alternative

With increase in incidence of multidrug resistant pathogens, there is a demand to adapt newer approaches in order to combat these diseases as traditional therapy is insufficient for their treatment. Use of nanotechnology provides a promising alternative as antimicrobial agents as against traditional antibiotics. Metal oxides have been exploited for a long times for their antimicrobial properties. Zinc oxide nanoparticles (ZnO NPs) are preferred over other metal oxide nanoparticles because of their bio-compatible nature and excellent antibacterial potentials. The basic mechanism of bactericidal nature of ZnO nanoparticles includes physical contact between ZnO nanoparticles and the bacterial cell wall, generation of reactive oxygen species (ROS) as well as free radicals and release of Zn2+ ions. This review focuses on different synthesis methods of ZnO nanoparticles, various analytical techniques frequently used for testing antibacterial properties, mechanism explaining antibacterial nature of ZnO nanoparticles as well as different factors affecting the antibacterial properties.

Nonvolatile ternary resistive switching memory devices based on the polymer composites containing zinc oxide nanoparticles

2018 ◽  
Vol 20 (8) ◽  
pp. 5771-5779 ◽  
Author(s):  
Yanmei Sun ◽  
Dianzhong Wen ◽  
Xuduo Bai
Keyword(s):  
Zinc Oxide ◽  
Polymer Blends ◽  
Polymer Composites ◽  
Resistive Switching ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Memory Devices ◽  
Resistive Switching Memory ◽  
Switching Memory

Nonvolatile ternary memory devices were fabricated from the composites polymer blends containing zinc oxide (ZnO) nanoparticles.

scholarly journals Phytosynthetic Ag doped ZnO nanoparticles: Semiconducting green remediators

2018 ◽  
Vol 16 (1) ◽  
pp. 556-570 ◽  
Author(s):  
Khuram Shahzad Ahmad ◽  
Shaan Bibi Jaffri
Keyword(s):  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Organic Dyes ◽  
Zinc Acetate Dihydrate ◽  
Polluted Water ◽  
Oxide Nanoparticles ◽  
Pseudo First Order Reaction ◽  
One Pot ◽  
Doped Zno

AbstractHighly stable semiconducting silver doped zinc oxide nanoparticles have been synthesized via facile, biomimetic and sustainable route, through utilization of Zinc acetate dihydrate (C4H6O4Zn · 2H2O) as host, Silver nitrate (AgNO3) as dopant and phytochemicals of angiospermic medicinal plant Prunus cerasifera as the reducing agents. Synthesis of Ag doped ZnO nanoparticles was done in a one pot synthetic mode by varying the amount of dopant from 0.2 – 2.0%. Synthesized photocatalyst nanoparticles were analyzed via UV-vis, FTIR, XRD and SEM. Commendable alleviation in the direct band gap i.e. 2.81 eV was achieved as a result of doping. Silver doped zinc oxide nanoparticles size ranged between 72.11 – 100 nm with rough surface morphology and higher polydispersity degree. The XRD patterns revealed the hexagonal wurtzite geometry of crystals with an average crystallite size of 2.99 nm. Persistent organic dyes Methyl Orange, Safranin O and Rhodamine B were sustainably photodegraded in direct solar irradiance with remarkable degradation percentages up to 81.76, 74.11 and 85.52% in limited time with pseudo first order reaction kinetics (R2 =0.99, 0.99 and 0.97). Furthermore, efficient inhibition against nine microbes of biomedical and agriculturally significance was achieved. Synthesized nanoparticles are potential green remediators of polluted water and perilous pathogens.

scholarly journals Synthesis of Zinc Oxide Nanoparticles Using Leaf Extract of Lippia adoensis (Koseret) and Evaluation of Its Antibacterial Activity

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Meron Girma Demissie ◽  
Fedlu Kedir Sabir ◽  
Gemechu Deressa Edossa ◽  
Bedasa Abdisa Gonfa
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Medicinal Plant ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Leaf Extract ◽  
Diffusion Method ◽  
Oxide Nanoparticles ◽  
Lippia Adoensis

The synthesis of metal oxide nanoparticles with the use of medicinal plant extract is a promising alternative to the conventional chemical method. This work aimed to synthesize zinc oxide nanoparticles using a green approach from indigenous “Koseret” Lippia adoensis leaf extract which is an endemic medicinal plant and cultivated in home gardens of different regions of Ethiopia. The biosynthesized zinc oxide nanoparticles were characterized using thermogravimetric analysis, X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, transmission electron microscopy, ultraviolet-visible spectroscopy, and Fourier transform infrared spectroscopy. Furthermore, this study also evaluated the antibacterial activity of the synthesized ZnO nanoparticles against clinical and standard strains of Escherichia coli, Klebsiella pneumonia, Staphylococcus aureus, and Enterococcus faecalis by the disc diffusion method. According to the result of this study, ZnO nanoparticles synthesized using Lippia adoensis leaf extract showed promising result against both Gram-positive and Gram-negative bacterial strains with a maximum inhibition zone of 14 mm and 12 mm, respectively, using uncalcinated form of the synthesized ZnO nanoparticles.

A biomolecule-assisted one-pot synthesis of zinc oxide nanoparticles and its bioconjugate with curcumin for potential multifaceted therapeutic applications

2019 ◽  
Vol 43 (30) ◽  
pp. 11934-11948 ◽  
Author(s):  
Prathap Somu ◽  
Subhankar Paul
Keyword(s):  
Zinc Oxide ◽  
Cancer Treatment ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Therapeutic Agent ◽  
Drug Carriers ◽  
Oxide Nanoparticles ◽  
One Pot ◽  
Therapeutic Applications ◽  
One Pot Synthesis

Biodegradable ZnO nanoparticles with excellent biocompatibility prepared via a biogenic process have great potential as therapeutic agent-cum-drug carriers for cancer treatment.

Preparation, Characterization and Optical Properties of Zinc Oxide Nanoparticles

1996 ◽  
Vol 452 ◽  
Author(s):  
Shoutian Li ◽  
Stuart J. Silvers ◽  
M. Samy El-Shall
Keyword(s):  
Crystal Structure ◽  
Zno Nanoparticles ◽  
Size Effects ◽  
Zinc Oxide Nanoparticles ◽  
Sol Gel ◽  
Laser Vaporization ◽  
Oxide Nanoparticles ◽  
Quantum Size Effects ◽  
Coated Particles ◽  
Quantum Size

AbstractZnO nanoparticles are produced by the laser vaporization-controlled condensation technique. These particles are connected in a web-like agglomeration. Their properties are compared to those of ZnO nanoparticles produced by solution sol-gel and reverse micelle techniques. All particles have the bulk crystal structure and show quantum size effects in absorption and emission. They show emissions that consist of a blue bandgap feature with a sub-nanosecond lifetime and a green feature with multiexponential lifetime decays. Emission from the stearate coated particles produced by the reversed micelle method is particularly intense.

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