Papers by Goncha Eyvazova
RSC advances, 2024
This study used a modified polyol technique to synthesize silver nanowires (AgNWs), which were su... more This study used a modified polyol technique to synthesize silver nanowires (AgNWs), which were subsequently mixed with polyvinyl alcohol (PVA) polymer and air-dried under ambient conditions. As a result, AgNWs/PVA nanocomposites with a concentration of 2% were prepared by a casting process. After that, the upper surface of the produced samples was treated with H 2 S gas, as a result of which asymmetric structures were formed depending on the gas concentration, exposure time and penetration into the layers. The structural, morphological, and optical properties of these asymmetric structures were analyzed. Changes in the sample structure were studied using X-ray diffraction (XRD), their optical properties were studied using ultraviolet-visible (UV-Vis), Raman spectroscopy, and their morphology using Transmission electron microscopy (TEM). A simple technique involving H 2 S gas was used for the sulfidation process of the samples, marking the first exposure of AgNW/PVA nanocomposites to such treatment. Examination of the structural and optical properties of the surfaces revealed clear differences in their physical properties after sulfidation. These obtained results were also supported by TEM images. Finally, the successful production of AgNWs/PVA/Ag 2 S anisotropic structure was achieved by this method.
Journal of rubber research, Mar 18, 2024
Journal of Cluster Science, Nov 27, 2023
RSC Advances, Dec 31, 2023
In the present investigation, Cu x Co 3−x O 4 (x = 0, 0.02, 0.04, 0.06, 0.1) nanoparticles have b... more In the present investigation, Cu x Co 3−x O 4 (x = 0, 0.02, 0.04, 0.06, 0.1) nanoparticles have been synthesized by the sonochemical method and subsequent calcination at high temperature. The synthesized nanoparticles were further characterized using X-ray diffraction, UV-vis spectroscopy, FT-IR spectroscopy, Raman spectroscopy, transmission electron microscopy and energy-dispersive X-ray spectroscopy. The analysis results showed that nanoparticle size, band gap and photocatalytic activity of Cu x Co 3−x O 4 compounds change by altering the Cu doping content. According to the XRD study, no impurity peaks associated with copper or copper oxide phases were observed in the diffractograms of doped samples. The highest degradation of methylene blue dye under visible light was observed in the presence of Cu 0.02 Co 2.98 O 4 nanoparticles and found to be 87.51% after 330 minutes. This value increased with increasing the amount of photocatalyst and with decreasing dye concentration.
Brazilian Journal of Physics, 2006
Micron-sized spheres of mesoporous styrene-divinylbenzene (Sty-DVB) copolymer were produced by su... more Micron-sized spheres of mesoporous styrene-divinylbenzene (Sty-DVB) copolymer were produced by suspension polymerisation in the presence of inert diluents. Using these mesoporous microspheres as a template, optically stable CdS nanoparticles have been synthesized. To characterize these CdS nanoparticles, Raman spectroscopy and micro-photoluminescence were used. We have observed enhanced emission and lasing action at certain wavelengths that correspond to the whispering gallery (WG) modes of the microspheres. High optical stability and low threshold value make this optical system promising in microlaser applications.
Carbohydrate Polymers, 2010
A procedure for synthesizing cellulose nanospheres with size of 5.9 and 10.9nm for cotton linter ... more A procedure for synthesizing cellulose nanospheres with size of 5.9 and 10.9nm for cotton linter and linen, respectively, was developed. A series of polyvinyl alcohol (PVA)/nano-cellulose films were cast. Mechanical, biodegradation and scanning electron micrograph (SEM) of nano-cellulose-filled PVA films were studied. With the addition of 20% nano-cellulose from linen there was an increase in the tensile strength and percentage
International Journal of Scientific and Technological Research, 2015
The dielectric permittivity of natural clinoptilolite has been measured in the wide frequency ran... more The dielectric permittivity of natural clinoptilolite has been measured in the wide frequency range up to microwave frequencies (4,5•10 10 radn /s) It describes in detail the method of measurements of the real part of dielectric permittivity by means of partly filled rectangle waveguide. Obtained result of ε ı =1,53 complements the results obtained previously in the range up to 10 6 Hz and makes it possible to interpret the frequency dependence of the dielectric permittivity with the help of the model of relaxation oscillator.
Materials Chemistry and Physics, Nov 1, 2017
Optoelectronics and Advanced Materials-rapid Communications, 2021
Azerbajčan himiâ žurnaly, Jun 20, 2019
TiO 2 nanoparticles have been prepared using sol-gel method from titanium(IV), isopropoxide, isop... more TiO 2 nanoparticles have been prepared using sol-gel method from titanium(IV), isopropoxide, isopropyl alcohol, ammonia hydroxide as precursors at mild condition without any post heat treatment for crystallization. The nanocrystalline TiO 2 powders were composed of rutile form TiO 2 by X-ray diffraction. The size of nanoparticles was examined by transmission electron microscopy and is about 10-15 nm, and the Brunauer-Emmett-Teller specific surface area of the rutile nanopowder makes up 159.6 m 2 /g. Photochemical degradation of phenol solution under ultraviolet irradiation of the synthesized TiO 2 nanoparticles has been carried out.
Journal of Inorganic and Organometallic Polymers and Materials, Aug 3, 2022
Thin films with the composition [(Bi 0.5 Na 0.5)-TiO 3 ] 0.92-[BaTiO 3 ] 0.08 (hereafter BNT-BT 0... more Thin films with the composition [(Bi 0.5 Na 0.5)-TiO 3 ] 0.92-[BaTiO 3 ] 0.08 (hereafter BNT-BT 0.08) were deposited on Pt-Si by spin-coating from a stable sol precursor. The BNT-BT 0.08 film, crystallized on the Bi 0.5 Na 0.5 TiO 3 rhombohedral lattice, was obtained after annealing the film-gel at 700°C. The films have a smooth surface (Rms = 2.76 nm) and grains with ferroelectric domains. The film showed a bandgap of 3.25 eV and a refractive index of 2.20 at a wavelength of 630 nm. The dielectric characteristics of BNT-BT 0.08 thin films were measured at room temperature and 10 kHz the dielectric constant (e r) was 243 and the loss tangent (tand) was 0.38. The remnant polarization (P r) was 0.87 lC/cm 2 and the coercive field (E c) was 220 kV/cm at 10 kHz and room temperature. The current density was approximately 2.7 9 10-5 A/cm 2 at low electric fields (100 kV/cm). BNT-BT 0.08 thin films shown piezoelectric properties (d 33eff = 100 pm/V) comparable to those of PZT thin films.
Asian Journal of Chemistry, 2018
The compounds 1-(3-methoxy-1-phenyl-propyl)morpholine and 1-(3-methoxy-1-phenyl-propyl)piperidine... more The compounds 1-(3-methoxy-1-phenyl-propyl)morpholine and 1-(3-methoxy-1-phenyl-propyl)piperidine have been synthesized using (3-methoxy-propenyl)benzene and 1-chloro-3-methoxy-propylbenzene. The structures of the synthesized compounds were analyzed by NMR and IR spectroscopic methods. Biological activities of obtained products were investigated against Gram-negative and Grampositive microorganisms. It has been showed that all the synthesized compounds possess pronounced antimicrobial activity against pathogenic bacteria Acinetobacter baumannii BDU32, Escherichia coli BDU12, Klebsiella pneumoniae BDU44, Pseudomonas aeruginosa BDU49 and Staphylococcus aureus BDU23.
Építőanyag, 2018
In the present study, the phenomenon of mass transfer of an aluminum film deposited on the zeolit... more In the present study, the phenomenon of mass transfer of an aluminum film deposited on the zeolite surface onto a clamping electrode was observed. The proposed four-layer model explains the very fact of mass transfer (inhomogeneous over the cross section of the structure) in the absence of anomalously large electric fields at the cathode.
Journal of The Iranian Chemical Society, Sep 13, 2022
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Physica E-low-dimensional Systems & Nanostructures, Jul 1, 2016
Cadmium sulfide nanoparticles were grown in Na 2 O-GeO 2 glass matrix by a diffusion-controlled p... more Cadmium sulfide nanoparticles were grown in Na 2 O-GeO 2 glass matrix by a diffusion-controlled phase decomposition of over-saturated solid solution. The structural properties of CdS nanocrystals have been studied by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), optical absorption and electrical conductivity. The existence of CdS nanocrystals was confirmed by XRD and TEM, also its crystallite sizes are obtained. The average CdS crystallite sizes calculated from XRD analysis for the different heat-treatment conditions are found in the range between 23.7 and 48.8 nm; however, the average CdS crystallite sizes obtained from TEM micrographs are found in the range between 17 and 63 nm. The band gap energy E opt and the activation energy E g for the electrical conductivity have been increased with decrease in the particle size; however, the Urbach energy DE decreases with decreasing the nanocrystal size.
Superlattices and Microstructures, Mar 1, 2016
Abstract We present the real and imaginary part of the dielectric permittivity of natural zeolite... more Abstract We present the real and imaginary part of the dielectric permittivity of natural zeolite composites prepared by using zeolite and silicon powders. The dielectric response (DR) dependences on the frequency (3–300 GHz) of electric field and different Si concentrations (5–33%) are non-monotonic and a maximum peak is observed. This peak position is practically independent on the frequency and its maximum is observed in zeolite composites which included 9% of the Si-powder. Also the maximum peak is decreased by about an order of magnitude when frequency increases from 500 Hz to 5 kHz. Addition of the conductive Si-particles to zeolite-powder leads to two opposite effects. Firstly, the movement of electrons in the Si-particles provides increase of DR. Secondly, cations which leaving from zeolite pores can be neutralized by the particles of Si in the intercrystalline-space. Such a peculiar mechanism for recombination of Si electrons and cations from pores leads to a reduction of DR for large silicon concentrations. Due to the fact that the contribution of free carriers in the decreasing of the DR as the frequency increases, it is consistent with the suggestion that the maximum peak decreases with increasing frequency.
Journal of Materials Chemistry B
This study describes the synthesis of a 40-membered macroheterocycle, promising PBP-2a non-β-lact... more This study describes the synthesis of a 40-membered macroheterocycle, promising PBP-2a non-β-lactam. The MIC of MHC3@Fe3O4 towards S. aureus is ≤0.5 μg mL−1 and in silico studies showed the high affinity of MHC3 to the allosteric site of PBP-2a.
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Papers by Goncha Eyvazova