Dielectric and optical properties of chitosan-Pb and chitosan-Bi nanocomposites

Zaki, Ayman A.; Abdel-Basset, T. A.; Haggar, Mohammed; Bashal, Ali H.

doi:10.1007/s10854-020-05107-7

Cited by 13 publications

(12 citation statements)

References 35 publications

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“…A higher density of defect states in the Cu-doped TiO 2 film may be the cause of the observed increase in E U with Cu doping [ 39 , 40 ]. At room temperature (T = 300 K), the steepness parameter S may be calculated as follows [ 41 ]:

…”

Section: Resultsmentioning

confidence: 99%

Innovatively feasible wet incipient method for preparing Cu doped TiO2 nanocomposite: Electro-optical measurement supported by quantitative quantum and classical calculations

Bashal,

Al-Refai,

Ibrahim

et al. 2024

Heliyon

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…”

Section: Resultsmentioning

confidence: 99%

Innovatively feasible wet incipient method for preparing Cu doped TiO2 nanocomposite: Electro-optical measurement supported by quantitative quantum and classical calculations

Bashal,

Al-Refai,

Ibrahim

et al. 2024

Heliyon

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“…When the frequency increases, the rotation speed of the dipole lags behind the change of the electric field. Dipole directional polarization stops leading to a decrease in the dielectric constant with increasing frequency (Zaki et al, 2021). At low frequencies (<2.5 GHz), the ε ′ of CS‐N solutions gradually increased with the increase of microwave treatment and the maximum value was 76.42 (at 0.5 GHz).…”

Section: Resultsmentioning

confidence: 99%

Proteases and microwave treatment on the quality of chitin and chitosan produced from white shrimp (Penaeus vannamei)

Dong

Qiu

Feng

et al. 2023

eFood

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The aim of this study was to extract chitin and chitosan from shrimp shells by neutral protease-assisted microwave multiple heating (one, two, three, and four) treatment. The structure and physicochemical properties of chitosan were characterized by scanning electron microscopy (SEM) and Fourier infrared spectroscopy (FTIR). The dielectric properties of chitosan acetate solution were determined by using a PNA-L network analyzer, and the correlation between chitosan deacetylation degree and dielectric loss was further analyzed. The results show that the degree of deacetylation of chitosan increased from 84.9% to 90.8% with the increase in the number of microwave heating treatments. Furthermore, the chitosan prepared by multiple microwave heating was smoother. The dielectric constant of chitosan solution gradually decreases with the increase of frequency, and the dielectric loss first decreases and then increases. In addition, the dielectric loss of the chitosan solution increased with the degree of deacetylation of chitosan at 2450 MHz (R 2 > 0.99). Therefore, enzyme-assisted microwave extraction of chitosan can be used to obtain high-quality chitosan under the condition of increasing the number of heating treatments.

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“…Refractive index plays a critical role in the investigation of materials and several optical technologies. Chitosan polymer's high refractive index values will enable its usage in a variety of optical applications, such as wave guides and light emitting diodes [33]. Refractive index (n) can be determined from the transmittance spectrum using the equations below [34]: It has been noticed that the refractive index varies with wavelength, and that as concentration is raised, the refractive index spectrum peak rises.…”

Section: Figure 6 Absorption Coefficient As a Function Of Wavelength ...mentioning

confidence: 99%

“…CS has a wide range of compounds with which it interacts well and improves their optical properties. This polymer has recently garnered a lot of interest [4] due to its many appealing properties, such as its film-forming capacity, good stability, high water permeability, strong electrode surface adhesion, biocompatibility, lack of toxicity, high mechanical resistance, affordable price, and susceptibility to chemical modifications due to the presence of reactive amino and hydroxyl functional groups.…”

Section: Introductionmentioning

confidence: 99%

Studying the effect of concentration on spectral and optical properties of chitosan polymer

Abdul-razzaq¹

2023

PEN

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Due to its noteworthy physico-chemical behaviors, the chitosan (CS) biopolymer presents a compelling alternative to conventional biomaterials. By measuring the emission spectra at a spectrofluorophotometer in different concentrates (1x10 -4 , 1x10 -5 , and 1x10 -6 ) M, the spectral characteristics of the CS polymer were obtained. The crystallinity of the CS polymer was determined by X-ray diffraction (XRD) analysis, which shows only one dominant peak indexed to the orthorhombic structure. With a drop in solution concentration, there was a shift toward the shorter wavelength and a decline in quantum yield. Using a UV-Vis spectrophotometer, the optical properties of the CS polymer, including its refractive index, absorption coefficient, energy band gap, extinction coefficient, and dielectric constant, have been studied. It was observed through the results that the optical parameters are linearly dependent with concentration. In contrast to the optical energy gap, which decreases with increasing concentration .

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Dielectric and optical properties of chitosan-Pb and chitosan-Bi nanocomposites

Cited by 13 publications

References 35 publications

Innovatively feasible wet incipient method for preparing Cu doped TiO2 nanocomposite: Electro-optical measurement supported by quantitative quantum and classical calculations

Innovatively feasible wet incipient method for preparing Cu doped TiO2 nanocomposite: Electro-optical measurement supported by quantitative quantum and classical calculations

Proteases and microwave treatment on the quality of chitin and chitosan produced from white shrimp (Penaeus vannamei)

Studying the effect of concentration on spectral and optical properties of chitosan polymer

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