Principles of Analytical Chemistry for Toxicology

Durner, Jürgen; Watts, D.C.

doi:10.1007/978-3-030-57499-4_91

Cited by 2 publications

(2 citation statements)

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“…The logarithmic relationship between the incident intensity I o and the re ected I A is known as absorbance A [10]:…”

Section: Theoretical Partmentioning

confidence: 99%

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Fabrication of (PVA-ZnO) nanocomposites and study of morphological, optical and electrical properties

Mohaimeed,

Rasheed,

2024

Preprint

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This paper's goal is to prepare PVA with ratios of 0.2, 0.4 and 0.6 wt% by casting method and with a thickness of 270 ± 5 micrometers. The morphological characteristics were examined (FE-SEM and FTIR) and the results showed that the composites have a homogeneous and granular structure and that ZnO is well distributed within the polymer, The reason for the increased movement of charges is the action of a grid of nanomaterials inserted into the polymer. FTIR analyses the absorption peak seen at 3321.33 cm− 1 is due to O-H bond that indicates the polymer and serves as its identity. The absorbance of the prepared composites showed an increase with increasing concentration of nanomaterials. In addition, the energy gap decreased with increasing concentration(2.8 to 2.5 eV) of nanomaterials, and all optical parameters (α, n, k°, Ɛr, Ɛi) increased with increasing concentration of nanomaterials. For all samples, it is found that the dielectric constant decreases as frequency increases, it also increases with increasing concentration of nanomaterials within the polymer. The decrease in the effect of charge polarization is the main factor in the dielectric loss of the PVA-ZnO nanocomposite, the same time, increasing the concentration of nanomaterials leads to an increase in the value the dielectric loss. The increase in the frequency of the electric field and the increase in the concentration of nanomaterials increases the electrical conductivity. This makes these films useful for electronic applications and light filters, and they can also be used as ultraviolet detectors and humidity sensors.

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“…The logarithmic relationship between the incident intensity I o and the re ected I A is known as absorbance A [10]:…”

Section: Theoretical Partmentioning

confidence: 99%

“…( 9), the dielectric constant (ε') of (PVA-ZnO) nanocomposites was determined. Figures (10) illustrates the behavior of the (PVA-ZnO) nanocomposites' dielectric constant with frequency. The dielectric constant is found to decrease with increasing frequency in all samples.…”

Section: Ac Electricalmentioning

confidence: 99%