Broadband reflection in polymer-stabilized cholesteric liquid crystal film with zinc oxide nanoparticles film thermal diffusion method

Abstract The biogenic synthesis of zinc oxide nanoparticles (ZnO NPs) with pinecone extract (PCE) as a reducing agent and antibacterial agent was explored. The current study aims to investigate the biosynthesis of ZnO NPs and their effect on photocatalytic dye degradation and antimicrobial properties. The physical, chemical, and morphological properties of biogenic ZnO NPs synthesized using PCE were investigated using advanced spectroscopy techniques such as Fourier transform infrared spectroscopy (FTIR), UV-visible spectroscopy, transmission electron microscopy (TEM) analysis, selected area electron diffraction (SAED), and X-ray diffraction (XRD) techniques. The photocatalytic degradation of methylene blue was measured spectrophotometrically using biogenic ZnO NPs as nanocatalysts, and decolonization of solution indicates dye degradation gradually as exposure duration increases. The antimicrobial properties of ZnONPs against the tested pathogenic strains were demonstrated using the disc diffusion method. The antimicrobial efficacy of ZnONPs was further explained using molecular docking analysis. Confirmation of the lowest binding energy was used to predict receptor binding site with NPs in order to understand the mechanistic approach. ZnONPs are likely to interact with pathogens via mechanical enfolding, which could be one of the major toxicity actions of ZnONPs against strains. Furthermore, the nontoxicity and biocompatibility of ZnO NPs were studied, revealing impressive hemocompatibility with red blood cells (RBCs) and no significant toxicity to Brine shrimps at lower ZnONP concentrations.

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Self-diffusion method for broadband reflection in polymer-stabilized cholesteric liquid crystal films

Liquid Crystals ◽

10.1080/02678292.2021.1979114 ◽

2021 ◽

pp. 1-10

Author(s):

Xuetao Zhang ◽

Weiting Shi ◽

Rui Han ◽

Hui Li ◽

Hui Cao ◽

...

Keyword(s):

Liquid Crystal ◽

Cholesteric Liquid Crystal ◽

Diffusion Method ◽

Liquid Crystal Films ◽

Self Diffusion ◽

Crystal Films ◽

Polymer Stabilized

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

Journal of Biomedical Nanotechnology ◽

10.1166/jbn.2021.3144 ◽

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.

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

Journal of Chemistry ◽

10.1155/2020/7459042 ◽

2020 ◽

Vol 2020 ◽

pp. 1-9 ◽

Cited By ~ 1

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.

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Effects of Zinc Oxide Nanoparticles Synthesized Using Aspergillus niger on Carbapenem-Resistant Klebsiella pneumonia In Vitro and In Vivo

Frontiers in Cellular and Infection Microbiology ◽

10.3389/fcimb.2021.748739 ◽

2021 ◽

Vol 11 ◽

Author(s):

Elsayim Rasha ◽

Manal M. Alkhulaifi ◽

Monerah AlOthman ◽

Ibrahim Khalid ◽

Elnagar Doaa ◽

...

Keyword(s):

Zinc Oxide ◽

Aspergillus Niger ◽

Zinc Oxide Nanoparticles ◽

Diffusion Method ◽

Oxide Nanoparticles ◽

Zno Nps ◽

X Ray ◽

Carbapenem Resistant

Currently, the mortality rate in Saudi Arabia’s ICUs is increasing due to the spread of Klebsiella pneumoniae carbapenemase (KPC)-producing bacteria. This study was carried out to evaluate the ability of biologically synthesized zinc oxide nanoparticles (ZnO-NPs) using Aspergillus niger to overcome carbapenem-resistant K. pneumoniae (KPC) in vitro and in vivo. ZnO-NPs were synthesized via a biological method and characterized using UV–Vis spectroscopy, Zetasizer and zeta potential analyses, x-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), and energy-dispersive x-ray spectroscopy (EDX). In vitro sensitivity of KPC to ZnO-NPs was identified using the well diffusion method. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined by a macro-dilution method. The morphological alteration of KPC cells after ZnO-NPs treatment was observed by SEM. The in vivo susceptibility of KPC cells to ZnO-NPs ointment was evaluated using wound healing in experimental rats. The chemical characterization findings showed the formation, stability, shape, and size of the synthesized nanoparticles. The MIC and MBC were 0.7 and 1.8 mg/ml, respectively. The in vivo results displayed reduced inflammation and wound re-epithelialization of KPC-infected rats. These findings demonstrated that ZnO-NPs have great potential to be developed as antibacterial agents.

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Preparation of zinc oxide nanoparticles using punica granatum and elettaria cardamomum fruit extract and determining its antibacterial activity against lactobacillus

International Journal of Research in Pharmaceutical Sciences ◽

10.26452/ijrps.v11i3.2473 ◽

2020 ◽

Vol 11 (3) ◽

pp. 3372-3376

Author(s):

Shilpa Merlyn Jose ◽

Hannah.R ◽

Rajeshkumar S

Keyword(s):

Zinc Oxide ◽

Antibacterial Activity ◽

Metal Oxide ◽

Zinc Oxide Nanoparticles ◽

Metal Oxide Nanoparticles ◽

Punica Granatum ◽

Diffusion Method ◽

Oxide Nanoparticles ◽

Fruit Extract ◽

Elettaria Cardamomum

To determine the antibacterial activity of Zinc oxide nanoparticles synthesised using Punica granatum and Elettaria cardamomum fruit extract against Lactobacillus. Punica granatum and Elettaria cardamomum have been known for their antimicrobial, antioxidant and anti-inflammatory activity. The phytochemicals present in these fruits have experimented for the preparation of various metal and metal oxide nanoparticles. Zinc oxide is a widely used metal oxide nanoparticle known for its good antimicrobial activity against a host of microbes. The current study was conducted to determine its effect against Lactobacillus, a bacteria known for its role in the progression of dental caries. Preparation of fruit extract mediated zinc oxide nanoparticles. Determining the characteristics of the nanoparticles using UV spectroscopy and SEM. Analysing the activity of these nanoparticles against Lactobacillus using agar well diffusion method. The zone of inhibition increased if the concentration of the fruit mediated zinc oxide nanoparticles increased. But it was incomparable to the standards. Hence, further studies need to be conducted using different concentration of Punica granatum and Elettaria cardamomum to determine the optimum fruit extract required for the preparation of the nanoparticles. The resultant nanoparticles can be used as an effective antimicrobial agent against Lactobacillus

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Antimicrobial Activity of Synthesized Zinc Oxide Nanoparticles using Ajuga bracteosa Leaf Extract

Asian Journal of Pharmaceutical Analysis ◽

10.52711/2231-5675.2021.00047 ◽

2021 ◽

pp. 275-280

Author(s):

M.C. Purohit ◽

Anuj Kandwal ◽

Reena Purohit ◽

A.R. Semwal ◽

Parveen Shama ◽

...

Keyword(s):

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Metallic Nanoparticles ◽

Leaf Extract ◽

Trichoderma Viride ◽

Colour Change ◽

Diffusion Method ◽

Klebsiella Pneumonia ◽

Oxide Nanoparticles ◽

Aspergillus Fumigates

Nanoscience and nanotechnology has attracted a lot of attention because of its wide variety of applications. Plant based metallic nanoparticles revolutionized the health sector with targeting nano drug to cure different ailments. Living beings are known to be susceptible to microbial attack followed by multidrug resistance of microorganism put the necessitates for searching more efficient methods of drug delivery or drug production. In the present study, we report the green synthesis of stable hexagonally shaped zinc oxide nanoparticles from leaf extract of Ajuga bracteosa and their antimicrobial efficacy against the selected bacterial (Streptococcus pneumonia, Staphylococcus aureus, Klebsiella pneumonia, Escherichia coli and Pseudomonas aeruginosa) and fungal (Aspergillus fumigates and Trichoderma viride) strains by using agar well diffusion method. Initial colour change and surface-plasmon-resonance (SPR) absorbance bands between 349 nm gave support to the synthesis of zinc oxide nanoparticles. These nanoparticles were further characterized by XRD, EDX, TEM and FTIR techniques. XRD analysis showed that nanoparticles are crystalline in nature. TEM measurements showed that nanoparticles are hexagonally shaped with their average size less than 27 nm. FTIR spectra confirms the presence of phytochemicals which were responsible for reducing, capping and stabilizing the nanoparticles. Antimicrobial results of the synthesized ZnO nanoparticles has indicated the good potential of nanoparticles against all tested microorganism in the present study.

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Greener Synthesis of Zinc Oxide Nanoparticles: Characterization and Multifaceted Applications

Molecules ◽

10.3390/molecules25184198 ◽

2020 ◽

Vol 25 (18) ◽

pp. 4198

Author(s):

Ali Aldalbahi ◽

Seham Alterary ◽

Ruba Ali Abdullrahman Almoghim ◽

Manal A. Awad ◽

Noura S. Aldosari ◽

...

Keyword(s):

Electron Microscopy ◽

Zinc Oxide ◽

Cell Line ◽

Zinc Oxide Nanoparticles ◽

Diffusion Method ◽

Oxide Nanoparticles ◽

Eosin Y ◽

Zno Nps ◽

Vitro Assay ◽

Vis Spectroscopy

Nanoparticles (NPs) have unique properties compared to their bulk counterparts, and they have potentials for various applications in many fields of life science. Green-synthesized NPs have garnered considerable interest due to their inherent features such as rapidity, eco-friendliness and cost-effectiveness. Zinc oxide nanoparticles (ZnO NPs) were synthesized using an aqueous extract of Kalanchoe blossfeldiana as a reducing agent. The resulting nanoparticles were characterized via X-ray diffraction (XRD), dynamic light scattering (DLS), UV-Vis spectroscopy, photoluminescence (PL), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The antimicrobial potential of the synthesized ZnO NPs against bacterial and fungal strains was examined by the disk diffusion method, and they showed a promising antibacterial and antifungal potential. The catalytic activity of the synthesized ZnO NPs in reducing methylene blue (MB) and eosin was studied via UV-Vis spectroscopy. The decolorization percentages of the MB and Eosin Y dyes were 84% and 94%, respectively, which indicate an efficient degradation of the ZnO NPs. In addition, the cytotoxic activity of the ZnO NPs on the HeLa cell line was evaluated via in vitro assay. The MTT assay results demonstrate a potent cytotoxic effect of the ZnO NPs against the HeLa cancer cell line.

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Antibacterial and Antifungal Properties of Electrospun Recycled PET Polymeric Fibers Functionalized with Zinc Oxide Nanoparticles

Polymers ◽

10.3390/polym13213763 ◽

2021 ◽

Vol 13 (21) ◽

pp. 3763

Author(s):

Katherine Vázquez ◽

Paul Vanegas ◽

Christian Cruzat ◽

Néstor Novoa ◽

Ramón Arrué ◽

...

Keyword(s):

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Raw Materials ◽

Diffusion Method ◽

Oxide Nanoparticles ◽

Zno Nps ◽

Polymeric Fibers ◽

Recycled Pet ◽

Antifungal Properties ◽

Antibacterial And Antifungal

Currently, to reduce the environmental problems associated with plastic waste, methods are being sought to use this waste as raw materials in different applications, such as fibers. In addition, to improve these materials and provide different properties, nanoparticles (NPs) are incorporated. In the present work, polymeric fibers made of recycled polyethylene terephthalate (r-PET) from post-consumer water bottles, functionalized with 0%, 1.5%, 3% and 6% zinc oxide nanoparticles (ZnO-NPs) in function of r-PET weight, were elaborated to evaluate their antibacterial and antifungal characteristics. The ZnO-NPs were synthesized by the solvothermal method, obtaining particles with a mean diameter of 38.15 nm, while the fibers were obtained by electrospinning with a diameter range between 200–5000 nm. The functionalized fibers were carried out against Escherichia coli and Bacillus subtilis through the agar diffusion method, obtaining the highest inhibition halo at 6% w/w ZnO-NPs, being 26.5 mm and 34.25 mm, respectively. In addition, the same method was used to evaluate the antifungal activity of Penicillium s.p. and Fusarium graminearum, observing antifungal properties due to the presence of nanoparticles in the fibers.

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Green Fabrication of Zinc Oxide Nanoparticles Using Phlomis Leaf Extract: Characterization and In Vitro Evaluation of Cytotoxicity and Antibacterial Properties

Molecules ◽

10.3390/molecules26206140 ◽

2021 ◽

Vol 26 (20) ◽

pp. 6140

Author(s):

Amal A. Alyamani ◽

Salim Albukhaty ◽

Salman Aloufi ◽

Faizah A. AlMalki ◽

Hassan Al-Karagoly ◽

...

Keyword(s):

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Leaf Extract ◽

Antibacterial Properties ◽

Normal Fibroblast ◽

Diffusion Method ◽

Oxide Nanoparticles ◽

Zno Nps ◽

Disk Diffusion Method

Green nanoparticle synthesis is an environmentally friendly approach that uses natural solvents. It is preferred over chemical and physical techniques due to the time and energy savings. This study aimed to synthesize zinc oxide nanoparticles (ZnO NPs) through a green method that used Phlomis leaf extract as an effective reducing agent. The synthesis and characterization of ZnO NPs were confirmed by UV-Vis spectrophotometry, Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Dynamic light scattering (DLS), Zeta potential, and Field Emission Scanning Electron Microscope (FESEM) techniques. In vitro cytotoxicity was determined in L929 normal fibroblast cells using MTT assay. The antibacterial activity of ZnO nanoparticles was investigated using a disk-diffusion method against S. aureus and E. coli, as well as minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) content concentrations. XRD results confirmed the nanoparticles’ crystalline structure. Nanoparticle sizes were found to be around 79 nm by FESEM, whereas the hydrodynamic radius of nanoparticles was estimated to be around 165 3 nm by DLS. FTIR spectra revealed the formation of ZnO bonding and surfactant molecule adsorption on the surface of ZnO NPs. It is interesting to observe that aqueous extracts of phlomis leave plant are efficient reducing agents for green synthesis of ZnO NPs in vitro, with no cytotoxic effect on L929 normal cells and a significant impact on the bacteria tested.

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