Antimicrobial and Toxicity Study of Zinc Oxide Sol–Gel Solution for Food Preservation Applications

2019 ◽  
Vol 11 (11) ◽  
pp. 1023-1030
Author(s):  
R. Vettumperumal ◽  
R. Sunder ◽  
S. Elayaraja ◽  
S. E. J. Jebasingh ◽  
S. Sudhakar ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Sol Gel ◽  
Food Preservation ◽  
Toxicity Study ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Security Systems ◽  
Visible Absorption ◽  
Potential Applications ◽  
Antibacterial And Antifungal

Food technology is being envisioned as a hurriedly developing field as it has potential applications to revolutionize food security systems and retaining the conditions of the food quality. Ubiquitously bacterial contamination is considered as an unresolved problem in food preservation and packing. The present study is mainly focused on the antibacterial activity and toxicity study of zinc oxide (ZnO) solution prepared by sol–gel method for food preservation applications. The presence of zinc oxide is confirmed from the X-ray diffraction pattern (XRD) and UV-Visible absorption spectrum. Antibacterial and fungal activity of ZnO sol–gel solution is carried out using disc diffusion method and the superior antibacterial and antifungal behaviour of ZnO is observed. The minimal inhibitory concentration of ZnO solution is analysed and tartan with the McFarland standard. The non toxicity behaviour of ZnO is observed by the ZnO treated rat livers and intestine analysis. Foods are packed with ZnO coated aluminium (Al) foil and the preserved food is without any contaminations compared to the uncoated foil.

scholarly journals Synthesis, Spectral Characterization, and Antibacterial and Antifungal Studies of PANI/V2O5Nanocomposites

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Chakradhar Sridhar ◽  
Nagesh Gunvanthrao Yernale ◽  
M. V. N. Ambika Prasad
Keyword(s):  
Antifungal Activity ◽  
Sol Gel ◽  
Chemical Oxidation ◽  
Diffusion Method ◽  
Antibacterial And Antifungal Activity ◽  
X Ray Diffraction ◽  
Xrd Techniques ◽  
Antibacterial And Antifungal

The present study deals with the synthesis and characterization of nanocrystalline vanadium pentoxide (V2O5) nanoparticles and their antibacterial and antifungal activity onStaphylococcus aureus and Aspergillus niger, respectively, by agar diffusion method. The metal oxide has been synthesized by employing the sol-gel method, polyaniline (PANI) has been synthesized by chemical oxidation, and PANI/V2O5composites have been synthesized byin situpolymerization method with different ratios (10, 20, 30, 40, and 50 weight%) of V2O5in PANI. The newly prepared composites were characterized by FTIR and powder X-ray diffraction (P-XRD) techniques and are found to be formed of PANI/V2O5nanocomposites, and also the compounds showed moderate antibacterial and antifungal activity.

Manufacturing radar-absorbing composite materials by using magnetic Co-doped zinc oxide particles synthesized by Sol-Gel

2020 ◽  
Vol 54 (26) ◽  
pp. 4059-4066
Author(s):  
Hüsnügül Yilmaz Atay ◽  
Öykü İçin
Keyword(s):  
Zinc Oxide ◽  
Sol Gel ◽  
Electromagnetic Properties ◽  
X Ray Diffraction ◽  
Important Place ◽  
Stealth Technology ◽  
Absorbing Materials ◽  
Potential Applications ◽  
Co Doped

An indicator of being a strong country in today's world is that they have powerful weapons. In this sector where science is used exceedingly, the “stealth” takes an important place. Radar-absorbing materials are used in stealth technology to disguise an object from radar detection, such that it can allow a plane to be perceived as a bird. In this study, Co-doped zinc oxide reinforced styrofoam sheet composites were manufactured as radar-absorbing materials. For this purpose, Co-doped zinc–ZnO particles were synthesized via the Sol-Gel method with doping concentrations of 0%, 3%, 6%, 9%, and 12%. They were embedded in a styrofoam matrix with different loading levels to see the concentration dependence. The as-prepared powders were characterized by using X-ray diffraction and Scanning Electron Microscope-Energy Dispersive Spectroscopy. Magnetic characterization of samples was carried out using a vibrating sample magnetometer. Finally, the radar-absorbing test was applied with a network analyzer to achieve the main purpose of this research. It was concluded that Co-doped zinc oxide reinforced composites have electromagnetic properties that indicate potential applications in the radar-absorbing area.

Preparation and Antibacterial Performances of Electrocatalytic Zinc Oxide Nanoparticles with Diverse Morphologies

2021 ◽  
Vol 17 (9) ◽  
pp. 1824-1829
Author(s):  
Junlin Li ◽  
Xiangfei Li ◽  
Dong Liang ◽  
Xiaojuan Zhang ◽  
Qing Lin ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Surface Area ◽  
Zinc Oxide Nanoparticles ◽  
Average Particle Size ◽  
Three Dimensional ◽  
Diffusion Method ◽  
Oxide Nanoparticles ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Zno Nps

This study exploits the potential of zinc oxide nanoparticles (ZnO-NPs) with diverse morphologies as catalysts and antibacterial agent. Spherical ZnO-NPs, rod-shaped ZnO-NPs and flower-shaped ZnO-NPs were prepared by microemulsion method, solvent heat method and hydrothermal method, respectively. The structural characterizations of samples were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. XRD results revealed the formation of spherical ZnO-NPs, rod-shaped ZnO-NPs and flower-shaped ZnO-NPs were all wurtzite crystal structure. SEM results showed that spherical ZnO-NPs had an average particle size of 30–40 nm, rod-shaped ZnO-NPs were about 500 nm long and 100 nm wide with obvious hexagonal crystals. Flower-shaped ZnO-NPs had a three-dimensional appearance with obvious petals. Results of electrochemical HER (Hydrogen evolution reaction) experiments revealed that spherical ZnO-NPs exhibited the highest electrocatalytic activity at the lowest potential voltage due to their largest specific surface area. The antibacterial property of ZnO-NPs samples were studied by the optical density method and disc diffusion method. All samples had antibacterial effects against E. coli. and flower-shaped ZnO-NPs showed the best antibacterial activity due to the largest surface area in comparison with spherical ZnO-NPs and rod-shaped ZnO-NPs, which promised the maximum Zn2+ release as bactericide mechanism that registered in the case of different ZnO-NPs morphologies.

Formation of Cobalt Doped Zinc Oxide Photocatalyst for Methyl Orange Degradation

2017 ◽  
Vol 264 ◽  
pp. 211-214 ◽  
Author(s):  
Farah Iddayu Abu Bakar ◽  
Katerina Anak Birang ◽  
Mohd Azam Mohd Adnan ◽  
Jeefferie Abd Razak ◽  
Syahriza Ismail
Keyword(s):  
Zinc Oxide ◽  
Methyl Orange ◽  
Sol Gel ◽  
Morphological Observation ◽  
X Ray Diffraction ◽  
Methyl Orange Degradation ◽  
Zno Nanostructure ◽  
Dopant Level ◽  
And Performance ◽  
Co Doped

The formation of cobalt (Co) doped zinc oxide (ZnO) as photocatalyst for photodegradation of methyl orange dye was investigated. The ZnO photocatalyst was produced with different concentration of Co by using sol gel method. The hexagonal wurtzite and zincite structure were successfully formed through this method. The morphological observation of nanorod and nanodisk structure formed was done by Field Emission Scanning Electron Microscope (FESEM). While, the structural properties of Co doped ZnO were identified by X-ray Diffraction (XRD) and Raman spectroscopy. The degradation performance of methyl orange was assessed and performance of photocatalytic activity was correlated to the amount of dopant level and oxygen vacancy of photocatalyst. There is an optimum amount of Co that can be doped into ZnO nanostructure in order to provide better degradation of methyl orange.

Synthesis and Antifungal Studies on CuO Nanostructures

2012 ◽  
Vol 488-489 ◽  
pp. 666-670 ◽  
Author(s):  
M. Hussain Beevi ◽  
S. Vignesh ◽  
T. Pandiyarajan ◽  
P. Jegatheesan ◽  
R. Arthur James ◽  
...  
Keyword(s):  
Sol Gel ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Disk Diffusion Method ◽  
Spectroscopic Measurements ◽  
Antifungal Activities ◽  
X Ray ◽  
Vibrational Bands ◽  
Anti Fungal

We report, synthesis and antifungal activities of CuO nanoparticles. Particles are prepared through sol-gel method. X-ray diffraction studies show the particles are monoclinic (crystalline) in nature. Scanning electron microscopic measurements are carried out to understand the morphology of the prepared particles. Energy-dispersive X-ray spectroscopic measurements show that the prepared particles containing Cu and O. To identify the local structure of the particles Fourier transform infra red (FTIR) spectroscopic measurements were carried out showing vibrational bands of Cu-O and O-H band. Anti fungal studies were performed on the set of fungal using disk diffusion method and found that the prepared particles are suitable for antifungal activities.

Synthesis of Ultra-Thin Superhydrophilic Titanium Oxide Film and its Effects on the Capillary of Microchannels

2010 ◽  
Author(s):  
Min Zhang ◽  
Bo Zhang ◽  
Tianhong Cui
Keyword(s):  
Titanium Oxide ◽  
Sol Gel ◽  
Nitrogen Atmosphere ◽  
Tio2 Films ◽  
Titanium Tetraisopropoxide ◽  
X Ray Diffraction ◽  
Before And After ◽  
Potential Applications ◽  
Temperature Surface

Ultra-thin superhydrophilic titanium oxide films were fabricated on silicon microchannels by an in situ reaction sol-gel method using titanium tetraisopropoxide as a starting material.. By changing the concentration of water in ethanol and reaction time, the thickness of synthesized TiO2 films can be controlled from around 10 nm to 80 nm. The contact angle of as-synthesized TiO2 films on flat silicon is around 20° and can be further decreased to zero by calcination at 700 °C in nitrogen atmosphere. X-ray diffraction spectra show the microstructure of the TiO2 films changed gradually from amorphous to anatase with the increase of calcination temperature. Surface morphology of the film before and after calcination also shows that a smoother coating with crystal structure was obtained by heat treatment. The flow velocity in the TiO2 coated channel reached around 0.03 m/s, almost ten times of that in PDDA/PSS coated channel and 4 times of that in SiO2 coated one. The ultra-thin superhydrophilic TiO2 films fabricated by this method show the ability to strongly increase the wettability of microchannels without affecting the morphology of the sidewall of the channels, indicating potential applications to biomolecule analysis and surface tension driven microfluidic systems.

Low Cost Integrated Sensors Utilizing Patterned Nano-Structured Titania Arrays Fabricated Using a Simple Process

2004 ◽  
Vol 828 ◽  
Author(s):  
Zuruzi Abu Samah ◽  
Andrei Kolmakov ◽  
Martin Moskovits ◽  
Noel C. MacDonald
Keyword(s):  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Aqueous Hydrogen Peroxide ◽  
X Ray ◽  
Sensing Systems ◽  
Potential Applications ◽  
Nano Wires ◽  
Low Temperature Process

ABSTRACTUsing a novel low-temperature process, we demonstrate the facile integration of crack-free nanostructured titania (NST) as sensing elements in microsystems. Unlike conventional sol-gel methods, NST layers of interconnected nano-walls and nano-wires were formed by reacting Ti surfaces with aqueous hydrogen peroxide solution. Cracks were observed in NST layers formed on blanket Ti films but absent on arrays of patterned Ti pads below a threshold dimension. Analyses using TEM, high resolution SEM, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) reveal that NST consists of anatase TiO2 nano-crystals. NST pads were found able to detect oxygen gas of a few ppm. NST pad arrays were integrated on rigid and flexible substrates with potential applications in low cost and wearable sensing systems.

Preparation and Characterization of Ordered Pb(Zr0.53Ti0.47)O3 Nanotube Arrays by Sol-Gel Template Method

2009 ◽  
Vol 79-82 ◽  
pp. 361-364
Author(s):  
Shi Shang Guo ◽  
Lin Ai ◽  
Dan Li ◽  
Li Zheng ◽  
Zheng Zhang
Keyword(s):  
Lead Zirconate Titanate ◽  
Sol Gel ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
Filling Rate ◽  
Pore Filling ◽  
Anodic Aluminum ◽  
Potential Applications ◽  
Perovskite Crystal

Ferroelectric lead zirconate titanate Pb(Zr0.53Ti0.47)O3 (PZT) nanotubes were prepared using porous anodic aluminum oxide (AAO) template by means of a simple sol-gel method. Scanning electron microscope (SEM) showed that closely packed PZT nanotubes were synthesized with a high pore-filling rate and aspect ratio after annealing at 700 °C. The X-ray diffraction investigations revealed that the annealed PZT nanotubes exhibit a polycrystalline microstructure and were composed of perovskite crystal structure. The results of polarization hysteresis and piezoresponse force microscope (PFM) measurements showed typical piezoelectricity in PZT nanotubes as well as stable electrical properties revealed by leakage current measurement, indicating potential applications using ferroelectric one-dimension nanostructures.

UNDERSTANDING THE EFFECT OF DEPRESSOR ON THE TIO2 COMPACT LAYER FOR THE PHOTOCURRENT PERFORMANCE OF PEROVSKITE SOLAR CELLS

2018 ◽  
Vol 25 (07) ◽  
pp. 1950019
Author(s):  
CHENCHEN JIA ◽  
MIN CHE ◽  
LEI ZHU
Keyword(s):  
Solar Cells ◽  
Sol Gel ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
Visible Absorption ◽  
Uv Visible ◽  
Short Current Density

The main purpose of a compact TiO2 film as a vital part of the electron transport layer in perovskite solar cells (PSCs) is to minimize electron–hole recombination on the surface of F-doped SnO2 (FTO) and enhance the photoelectric property. By controlling concentrations and using different depressors, an excellent compact TiO2 film is prepared by sol–gel method. This research utilized four depressors (nitric acid, acetic acid, diethanolamine and acetylacetone) and their volume ratios to ethanol are 0, 1:1 and 1:2 to synthesize the TiO2 precursor sol. The surface morphology, ingredient and microstructure as well as the optical and electrochemical properties of PSC devices based on them are investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV–visible absorption spectroscopy (UV–Vis), respectively. It is found that the device exhibited the most outstanding power conversion efficiency (PCE) of 14.92% via using diethanolamine as the depressor diluted in absolute ethanol in a proportion of 1:1 by volume. Further study showed that the enhanced PCE could be mainly ascribed to the increase of short-current density ([Formula: see text].

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