Surface and spectroscopic properties of CdSe/ZnS/PVC nanocomposites

Ahmed, R. M.

doi:10.1002/pc.23634

Cited by 17 publications

(13 citation statements)

References 52 publications

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“…Table II shows a decrease in the values of energy gaps of both the direct and indirect transitions, with increasing PEG content embedded in PVA up to the blend PVA/PEG 79/21 after which they increased. The decrease in the energy gap values is attributed to the formation of the localized states in the band gap by embedding PEG in PVA [18]. The formed localized states act as trapping and recombination centers which results in an alteration in the optical band gap.…”

Section: Interband Transitionsmentioning

confidence: 99%

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020

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In the present research work a solution casting technique was utilized to fabricate various blends of polyvinyl alcohol (PVA)/polyethylene glycol (PEG). Embedding PEG in PVA resulted in obvious shifts in the absorption edge which points to a decrease in the energy gap values based on PEG content. Loss of the photon energy was a consequence of increasing the extinction coefficient at high wavelengths. The PEG content increased the refractive index of the PVA in the produced PVA/PEG blends. The direct and indirect energy gap values were decreased whereas the Urbach energy values were increased with increasing the PEG content. The exact electron transition which is responsible for the absorption process was determined successfully based on the complex optical dielectric functions. In addition, some other optical parameters were estimated to more understand fully the effect of embedding the PEG in the PVA. The Fourier transform infra red spectroscopy was used to determine the characteristic functional groups of both the PVA and the PEG.

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Section: Interband Transitionsmentioning

confidence: 99%

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020

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“…The contact angle measurement was conducted to assess the surface hydrophobicity of the developed nanofibrous membranes. The contact angle is mainly dependent on the chemical composition and geometric microstructure of solid surface (Ahmed, 2017). It has been proven that a contact angle below 30° denotes a hydrophilic surface (Salarbashi, Tafaghodi, & Bazzaz, 2018).…”

Section: Resultsmentioning

confidence: 99%

Electrospun hydrophobe nanofibrous membrane based on polysulfone/Triton x‐100: A novel vehicle to concentrate pomegranate juice

Najafi

Emam‐Djomeh

Askari

et al. 2020

J Food Process Engineering

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Aims: The present work aimed to fabricate an electrospun hydrophobe nanofibrous membrane based on polysulfone (PSF) to concentrate pomegranate juice, and evaluate the effect of Triton x-100 (TR-100) on the physicochemical properties of the fabricated membrane. Methods: Morphological properties, surface hydrophobicity, and mechanical performance of the nanofibrous membrane were evaluated, and then, its ability to concentrate pomegranate juice was tested.

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“…Table (2): shows a decrease in the values of E g , by increasing the CoCl 2 content embedded in the blend of (PVA/PEG 72/28). The decrease in the energy gap values is attributed to the formation of the localized states in the band gap by embedding the CoCl 2 in the blend [13]. The formed localized states are playing as trapping and recombination centers, which results in a remarkable alteration in the optical band gap.…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

Effect of Cobalt Chloride on the Optical Properties of PVA/PEG Blend

Ahmed

Ibrahiem

El-sayd

2018

Arab Journal of Nuclear Sciences and Applications

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Different composite films of cobalt chloride (CoCl 2) embedded in a blend of (poly vinyl alcohol (PVA) /poly ethylene glycol (PEG) 72/28 wt. %) were prepared by the solution casting technique. Fourier Transform infrared (FT-IR) spectroscopy was used to identify the effect of CoCl 2 on the characteristic functional groups of both PVA and PEG. A shift in the absorption edge of the pure blend was observed by adding CoCl 2 which indicates a decrease in the energy gap (E g) values based on the CoCl 2 content. By increasing the content of CoCl 2 , the refractive index, the Urbach energy, the dispersion parameters, the moments of the optical spectrum and the static dielectric constants show a reduction in their values compared to those of the pure blend. The oscillator energy gap E o equals about 2.23 E g , for the different composites. The calculated values of the penetration depth, for all the composites, exhibit an increase by increasing the wavelength whereas they decrease in the region of the absorption band of the CoCl 2 from 420 nm to 750 nm depending on the CoCl 2 content. The optical conductivity of the composites has been increased in the region of the absorption band of the CoCl 2 .

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Surface and spectroscopic properties of CdSe/ZnS/PVC nanocomposites

Cited by 17 publications

References 52 publications

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

Electrospun hydrophobe nanofibrous membrane based on polysulfone/Triton x‐100: A novel vehicle to concentrate pomegranate juice

Effect of Cobalt Chloride on the Optical Properties of PVA/PEG Blend

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