scholarly journals Effect of Zinc Oxide Nano Particle Concentration in the Polyaniline-Zinc Oxide Nanocomposite on the Dielectric Property

2014 ◽  
Vol 11 (2) ◽  
pp. 146-152 ◽  
Author(s):  
N Verma
Keyword(s):  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Solid Phase ◽  
Diffraction Method ◽  
Lattice Parameter ◽  
Wave Number ◽  
Dielectric Study ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Imaging Mode

Films of polyaniline and polyaniline–ZnO composites were synthesized by spin coating. The spin coated films were deposited over glass substrate. In order to confirm the dispersion quality and the size of the dispersed ZnO, Transmission electron microscopy was done. The TEM images show that ZnO nanoparticles were spherical in shape. Dark imaging mode confirmed these particles in solid phase and revealed the uniform distribution of the particles in the PANI matrix. The absorption peaks in FTIR spectra of PANI–ZnO composite film were found to shift to higher wave number when compared with pure PANI. The observed shifts were attributed to the interaction between the ZnO particle and PANI molecular chains. A change in the value of lattice parameter of ZnO as confirmed through the X ray diffraction method in the composite indicated the presence of interaction between ZnO particles and matrix. The dielectric study of PANI and PANI–ZnO composites demonstrated a significant decrease in the value of dielectric constant after the incorporation of the ZnO nanoparticles in the polymer matrix.

Synthesis and Characterization Silver, Zinc Oxide and Hybrid Silver/Zinc Oxide Nanoparticles for Antimicrobial Applications

Nano LIFE ◽  
2014 ◽  
Vol 04 (01) ◽  
pp. 1440003 ◽  
Author(s):  
Myisha Roberson ◽  
Vijaya Rangari ◽  
Shaik Jeelani ◽  
Temesgen Samuel ◽  
Clayton Yates
Keyword(s):  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Biomedical Application ◽  
Fungal Growth ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Zno Nps ◽  
E Coli ◽  
Transmission Electron ◽  
20 Nm

Silver ( Ag ) and zinc oxide ( ZnO ) are well known for both antimicrobial and pro-healing properties. Here, we present a novel method to synthesize Ag and ZnO nanoparticles (NPs), as well as hybrid Ag / ZnO NPs using a custom, temperature controlled microwave assisted technique. Microwave synthesis has been shown not only to enhance the rate of chemical reactions, but also in some cases to give higher product yields over thermal heating. The as-synthesized NPs were characterized by X-ray diffraction (XRD) to study the crystalline structure, composition and purity. Transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) was used to study particle size, shape, composition and morphology. These results indicated that the as-prepared Ag NPs are spherical in shape and ~ 20 nm in sizes. The ZnO NPs are typically rod shaped and the particle sizes are ~ 20 nm in width and 100 nm in length. These NPs were tested for antibacterial and/or antifungal properties using disc diffusion assays. Results show microwave synthesized NPs inhibit growth of S. aureus, E. coli and C. albicans at 50 μ g/mL treatment concentration. Ag NPs were most effective in inhibiting bacterial and fungal growth at the concentrations tested followed by hybrid Ag / ZnO and ZnO nanoparticles. These results also suggest that the hybridization of ZnO to Ag NPs may reduce the toxicity of Ag NPs. Further studies are needed to understand the functional interaction between the two types of NPs and to improve their ability for biological or biomedical application.

Preparation and Properties of Polyvinylpyrrolidone / Zinc Oxide Composite Nanofibers

2011 ◽  
Vol 399-401 ◽  
pp. 407-414
Author(s):  
Guo Qiang Xu ◽  
Li Guo Sun ◽  
Shu Hong Wang ◽  
Yang Xie ◽  
Cheng Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Composite Nanofibers ◽  
Diameter Distribution ◽  
Gravimetric Analysis ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
Phosphorescence Lifetime ◽  
Transmission Electron

Zinc Oxide (ZnO) nanoparticles were firstly synthesized by the hydration of alkoxide. The as-synthesized ZnO were dispersed in the polyvinylpyrrolidone (PVP) solution. PVP/ZnO composite nanofibers were prepared via electrospinning the PVP/ZnO mixed solution. The morphology of ZnO nanoparticles and as-spun nanofibers was measured by scanning electron microscopy (SEM). The as-synthesized ZnO nanoparticles were homogeneous and stable, and their size ranged from 30 to 40 nm. The composite nanofibers showed a uniform and continuous morphology. With the increase of the ZnO content in the composite nanofibers, the diameter distribution of the composite nanofibers became wider. Transmission electron microscopy (TEM) images clearly showed that ZnO nanoparticles were distributed uniformly in the PVP/ZnO composite nanofibers without any aggregation, although the ZnO content reached as highly as 6 wt. %. The structures and properties of the composite nanofibers were investigated using X-ray diffraction (XRD), thermal gravimetric analysis (TGA), and Combined Stead State Fluorescence and Phosphorescence Lifetime Spectrometer (FLSP).

scholarly journals Cinnamomum verum Bark Extract Mediated Green Synthesis of ZnO Nanoparticles and Their Antibacterial Potentiality

Biomolecules ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 336 ◽  
Author(s):  
Mohammad Azam Ansari ◽  
Mahadevamurthy Murali ◽  
Daruka Prasad ◽  
Mohammad A. Alzohairy ◽  
Ahmad Almatroudi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Green Synthesis ◽  
Zno Nanoparticles ◽  
Advanced Characterization ◽  
Wave Number ◽  
Bark Extract ◽  
Zno Nps ◽  
Sem Images ◽  
Transmission Electron

Cinnamomum verum plant extract mediated propellant chemistry route was used for the green synthesis of zinc oxide nanoparticles. Prepared samples were confirmed for their nano regime using advanced characterization techniques such as powder X-ray diffraction and microscopic techniques such as scanning electron microscopy and transmission electron microscopy. The energy band gap of the green synthesized zinc oxide (ZnO)-nanoparticles (NPs) were found between 3.25–3.28 eV. Fourier transmission infrared spectroscopy shows the presence of Zn-O bond within the wave number of 500 cm−1. SEM images show the specific agglomeration of particles which was also confirmed by TEM studies. The green synthesized ZnO-NPs inhibited the growth of Escherichia coli and Staphylococcus aureus with a minimum inhibitory concentration (MIC) of 125 µg mL−1 and 62.5 µg mL−1, respectively. The results indicate the prepared ZnO-NPs can be used as a potential antimicrobial agent against harmful pathogens.

scholarly journals Growth of sillenite Bi12FeO20 single crystals: structural, thermal, optical, photocatalytic features and first principle calculations

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Durga Sankar Vavilapalli ◽  
Ambrose A. Melvin ◽  
F. Bellarmine ◽  
Ramanjaneyulu Mannam ◽  
Srihari Velaga ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Photoelectron Spectroscopy ◽  
Diffraction Method ◽  
Lattice Parameter ◽  
First Principle ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Principle Calculations ◽  
Photodegradation Efficiency

AbstractIdeal sillenite type Bi12FeO20 (BFO) micron sized single crystals have been successfully grown via inexpensive hydrothermal method. The refined single crystal X-ray diffraction data reveals cubic Bi12FeO20 structure with single crystal parameters. Occurrence of rare Fe4+ state is identified via X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The lattice parameter (a) and corresponding molar volume (Vm) of Bi12FeO20 have been measured in the temperature range of 30–700 °C by the X-ray diffraction method. The thermal expansion coefficient (α) 3.93 × 10–5 K−1 was calculated from the measured values of the parameters. Electronic structure and density of states are investigated by first principle calculations. Photoelectrochemical measurements on single crystals with bandgap of 2 eV reveal significant photo response. The photoactivity of as grown crystals were further investigated by degrading organic effluents such as Methylene blue (MB) and Congo red (CR) under natural sunlight. BFO showed photodegradation efficiency about 74.23% and 32.10% for degrading MB and CR respectively. Interesting morphology and microstructure of pointed spearhead like BFO crystals provide a new insight in designing and synthesizing multifunctional single crystals.

Investigation of Microbial Cellulose/Cotton/Silver Nanobiocomposite as a Modern Wound Dressing

2013 ◽  
Vol 829 ◽  
pp. 616-621 ◽  
Author(s):  
Ramin Khajavi ◽  
Amin Meftahi ◽  
Somayeh Alibakhshi ◽  
Leila Samih
Keyword(s):  
Electron Microscopy ◽  
Wound Dressing ◽  
Moisture Absorption ◽  
Diffraction Method ◽  
Test Method ◽  
Cellulose Synthesis ◽  
X Ray Diffraction ◽  
Microbial Cellulose ◽  
Antimicrobial Efficiency ◽  
Transmission Electron

In this study the nanobiocomposite of Microbial cellulose/Cotton/Silver is introduced as a modern wound dressing. Microbial cellulose was synthesized in situ on cotton gauze. The static medium culture (Hestrin & Scharm) and Acetobacter Xylinum used for microbial cellulose synthesis and 6 days formed layers used for experiments. Half of 6 days samples were reverse after 3 days in order to form double coated gauze. One or two coated sides specimens were deactivated purified and dipped in a 500ppm nanosilver concentration. Specimens were analyzed by X-ray diffraction method, Fourier transform infra-red spectroscopy, Scanning electron microscopy and transmission electron microscopy. Their water and moisture absorption determined and their antibacterial efficiency evaluated by AATCC 100 antibacterial test method. Results showed about 30% increase in water absorption with less than 8% moisture regain. Microscopic images showed a proper distribution of nanosilver without agglomerations at surface and inside nanobiocomposite which caused improved antimicrobial efficiency. The obtained results indicated that nanocomposite (double coated gauze) has high potential for applying as a modern wound dressing.

X-Ray and Magnetic Measurements of TmFeTi2O7

2014 ◽  
Vol 215 ◽  
pp. 470-473 ◽  
Author(s):  
Tamara V. Drokina ◽  
German A. Petrakovskii ◽  
Dmitrii A. Velikanov ◽  
Maksim S. Molokeev
Keyword(s):  
Spin Glass ◽  
Solid Phase ◽  
Magnetic Measurements ◽  
Diffraction Method ◽  
Freezing Temperature ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
History Of

In this paper we are reported about a peculiarity of the crystal structure and the magnetic state of TmFeTi2O7. The compound TmFeTi2O7 has been synthesizedusing the solid-phase reaction method. Using X-ray diffraction method the disorder in the distribution of the iron ions over five nonequivalent crystal sites was observed, also the populations of the iron atoms positions were determined. We show that below Tf = 6 K the magnetization of TmFeTi2O7 depends on the magnetic history of the sample. There are indications for spin glass state. This results allow us to assume the state of spin glass is realized below freezing temperature Tf = 6 K in TmFeTi2O7.

Dried plum-like ZnO assemblies consisted of ZnO nanoparticles synthesized by ultrasonic spray pyrolysis

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040005 ◽  
Author(s):  
Congzhi Zhang ◽  
Tao Han ◽  
Wei Wang ◽  
Jin Zhang
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Field Emission ◽  
Zno Nanoparticles ◽  
Ultrasonic Spray Pyrolysis ◽  
Precursor Solution ◽  
Spray Pyrolysis Method ◽  
X Ray Diffraction ◽  
Ultrasonic Spray ◽  
Transmission Electron

Dried plum-like ZnO assemblies consisting ZnO nanoparticles were synthesized by an ultrasonic spray pyrolysis method (USP). ZnO assemblies were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS) and field-emission transmission electron microscopy (TEM). The results show the size of ZnO assemblies is in the range of 300–870 nm, and that of ZnO nanoparticles is from 33 nm to 39 nm. The microstructure and size of ZnO assemblies were successfully controlled by the concentration of the precursor solution.

Formation, Structure and Optical Properties of Nanocrystalline BaSi2 Films on Si(111) Substrate

2015 ◽  
Vol 245 ◽  
pp. 42-48 ◽  
Author(s):  
Dmitrii Vladimirovich Fomin ◽  
Victor Leonidovich Dubov ◽  
Konstantin Nickolaevich Galkin ◽  
Dmitrii L'vovich Goroshko ◽  
Andrei Mikhailovich Maslov ◽  
...  
Keyword(s):  
Solid Phase ◽  
Interband Transition ◽  
Grazing Incidence ◽  
Wave Number ◽  
X Ray Diffraction ◽  
Defect States ◽  
Force Microscopy ◽  
Atomic Force ◽  
Density Of Defect States ◽  
Anneal Temperature

BaSi2 thin films were formed on Si (111) substrate by solid-phase epitaxy (SPE) (UHV deposition) using the template technology followed by vacuum annealing at temperatures of 600 °C and 750 °C. After the deposition and annealing barium silicide films were characterized by Auger electron spectroscopy, grazing incidence x-ray diffraction (GIXRD) and atomic-force microscopy (AFM). It was established that the films annealed at T = 600 °C are polycrystalline with the structure of the orthorhombic BaSi2, with grain sizes of 100-200 nm. Higher anneal temperature (T=750 °C) leads to increase of diffraction peak intensity of BaSi2 phase with grain coagulation into 300-400 nm islands. It was confirmed that nanocrystalline BaSi2 films are characterized by a direct fundamental interband transition at 1.3 eV, the second interband transition with an energy of 2.0 eV, own phonon structure with wave number peaks at 112, 119, 146 and 208 cm-1 and a high density of defect states within the band gap, which provide a noticeable subband absorption at energies of 0.8 – 1.1 eV.

scholarly journals Bioactivities of Geranium wallichianum Leaf Extracts Conjugated with Zinc Oxide Nanoparticles

Biomolecules ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 38 ◽  
Author(s):  
Banzeer Ahsan Abbasi ◽  
Javed Iqbal ◽  
Riaz Ahmad ◽  
Layiq Zia ◽  
Sobia Kanwal ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Energy Dispersive ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Leaf Extracts ◽  
Tem Analysis ◽  
X Ray ◽  
Transmission Electron

This study attempts to obtain and test the bioactivities of leaf extracts from a medicinal plant, Geranium wallichianum (GW), when conjugated with zinc oxide nanoparticles (ZnONPs). The integrity of leaf extract-conjugated ZnONPs (GW-ZnONPs) was confirmed using various techniques, including Ultraviolet–visible spectroscopy, X-Ray Diffraction, Fourier Transform Infrared Spectroscopy, energy-dispersive spectra (EDS), scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The size of ZnONPs was approximately 18 nm, which was determined by TEM analysis. Additionally, the energy-dispersive spectra (EDS) revealed that NPs have zinc in its pure form. Bioactivities of GW-ZnONPs including antimicrobial potentials, cytotoxicity, antioxidative capacities, inhibition potentials against α-amylase, and protein kinases, as well as biocompatibility were intensively tested and confirmed. Altogether, the results revealed that GW-ZnONPs are non-toxic, biocompatible, and have considerable potential in biological applications.

scholarly journals Growth and Characterizations of Organic NLO Imidazolium L-Tartrate (IMLT) Single Crystal

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Hiral Raval ◽  
B. B. Parekh ◽  
K. D. Parikh ◽  
M. J. Joshi
Keyword(s):  
Second Harmonic ◽  
Structural Parameters ◽  
Diffraction Method ◽  
Nir Spectroscopy ◽  
Optical Parameters ◽  
Dielectric Study ◽  
X Ray Diffraction ◽  
Monoclinic Crystal ◽  
Monoclinic Crystal Structure ◽  
Evaporation Technique

Good quality single crystals of organic imidazolium L-Tartrate (IMLT) are grown up from aqueous solution by slow solvent evaporation technique. Various structural parameters and monoclinic crystal structure have been confirmed using powder X-ray diffraction method. The presence of various functional groups has been identified by ATR-FTIR. UV-Vis-NIR spectroscopy has shown more than 60% of optical transparency with the lower UV cutoff at 245nm. The optical band gap value of the material is evaluated to be 4.8 eV. Other optical parameters such as refractive index, optical and electrical conductivity, Urbach energy, extinction coefficient, and optical and electrical susceptibility have been evaluated from transmission spectrum data. The above essential parameters manifest appropriate usage of IMLT as an NLO material. The thermogravimetric analysis indicates high thermal stability of material up to 214°C. Apart from that, the dielectric study at various temperatures confirms decrement of dielectric constant and dielectric loss at higher frequencies. The efficiency of Second Harmonic Generation (SHG) is found to be 3.5 times that of the KDP crystals. A range of analysis suggests suitability and potentiality of IMLT crystal for various optoelectronic applications.

Sign in / Sign up

Export Citation Format

Share Document