Gamma irradiation effect towards photoluminescence and optical properties of Makrofol DE 6-2

El-Mesady, I.A.; Rammah, Y.S.; Abdalla, Ayman M.; Ghanim, E.H.

doi:10.1016/j.radphyschem.2019.108578

Cited by 41 publications

(11 citation statements)

References 23 publications

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“…(2). The decrease of the absorbance with the increase in the wavelength was attributed to reducing the number of (n− π*) carbonyl group and phenyl group (π− π*) transitions [25]. Furthermore, the absorbance of the samples was improved with raising the laser fluences up to 18 J/cm 2 due to the development of bonding via crosslinks [26].…”

Section: Absorption Analysismentioning

confidence: 97%

Effect of GaAs pulsed laser on the structure and optical characterization of Makrofol VLG 7-1

Bahareth

2022

Arab Journal of Nuclear Sciences and Applications

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Samples ofMakrofol films were exposed to different laser fluences (2-18 J/cm 2 ). X-ray diffraction (XRD) and ultraviolet spectroscopy (UVs) techniques were used to explore the resultant effect of laser radiation on the structure and optical characteristics of the Makrofol polymer. The change of refractive index (n) and the optical band gap (Eg) with the laser fluence was interpreted. A reduction in the Eg values (3.08-2.54 electron volt) was observed when raising the laser fluence up to 18 J/cm 2 . This was accompanied by an increase in refractive index from 2.376 to 2.533. This was attributed to the prevalence of crosslinking that damaged the crystalline portion in the Makrofol polymer. The crosslinking created color centers that induced differences in color between the exposed films and the uncolored pristine Makrofol film. The color difference was significant as the values of E were greater than 5. This optimized the Makrofol polymer to be used in dosimetric applications.

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Section: Absorption Analysismentioning

confidence: 97%

Effect of GaAs pulsed laser on the structure and optical characterization of Makrofol VLG 7-1

Bahareth

2022

Arab Journal of Nuclear Sciences and Applications

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“…Other authors attributed it to the creation of color centers [44]. This indicates that the occurrence of photochemical reactions in the NC matrix owes to the absorption of UV light that activates the macro-molecules to its single or triple state [42]. Additionally, the absorption coefficient increased with the γ dose, meaning that the intermediate atoms of the NC have absorbed the incident photon energy.…”

Section: Absorption Coefficient Investigationmentioning

confidence: 99%

“…The absorption coefficient increased while increasing the energy. Certain authors attributed the increase in absorbance with energy to the π−π* phenyl ring and locally excited transition n−π* among the energy levels [42]. This was related to the amount of conjugation between neighboring phenyl rings in the PVA chains [43].…”

Section: Absorption Coefficient Investigationmentioning

confidence: 99%

Structural, Thermal, and Optical Studies of Gamma Irradiated Polyvinyl Alcohol-, Lignosulfonate-, and Palladium Nanocomposite Film

et al. 2022

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Nanocomposite (NC) films of polyvinyl alcohol (PVA), lignosulfonate (Lg), and nanosized palladium (Pd) were synthesized by ex-situ casting method. Samples from the synthesized PVA-Lg/Pd NC films were irradiated with 5–100 kGy γ doses. The effect of γ doses on the structural, thermal, and optical characteristics of the NC films were studied using different characterization techniques. The results indicated that the γ irradiation improves the decomposition temperature from 227 to 239 °C, signifying an increase in the thermal stability of the NC films. This was accompanied by a reduction of the melting temperature due to the increase of the amorphous phase. This can be attributed to the dominance of crosslinking. On the other hand, the refractive index increased from 2.21 to 2.32 while increasing the γ dose up to 100 kGy. This was associated with a reduction of the optical bandgap from 3.49 to 3.30 eV, which could be attributed to the increase in the amorphous phase as a result of crosslinking. This indicates an enhancement of the spreading of the NPs inside the blend matrix due to γ irradiation. This results in a more compacted construction of the PVA-Lg/Pd NC films. Furthermore, we used the Commission Internationale de E’Claire (CIE) method to estimate the change in color among the irradiated NC films and the pristine film. The PVA-Lg/Pd NC attained a significant color difference value greater than five, meaning permanent color changes.

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“…An elevated absorbance band was detected at near 290 nm and reduced at near 300 nm. The reduction in absorbance versus wavelength may be owing to n−p* transition carbonyl grouping C=O and p−p* phenyl grouping [43]. Moreover, this may be due to the creation of color centers at 290-300 nm wavelength range [44].…”

Section: Optical Analysis Of Pc/zns Ncp Samples 321 Analysis Of Uv Absorptionmentioning

confidence: 99%

“…Moreover, this may be due to the creation of color centers at 290-300 nm wavelength range [44]. At near 290 nm, the photochemical reaction occurs in PC matrix due to the effect of UV radiation which encourages the macro-molecules to its singlet or triplet state [43]. At the range 310-400 nm, the g radiation will break only the C−H bond.…”

Section: Optical Analysis Of Pc/zns Ncp Samples 321 Analysis Of Uv Absorptionmentioning

confidence: 99%

Tailoring the optical properties of PC/ZnS nanocomposite by γ radiation

Bahareth

Barakat

Alhodaib

et al. 2021

Eur. Phys. J. Appl. Phys.

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Chemical coprecipitation methodology in atmospheric air has been used to prepare Zinc sulfide (ZnS) nanoparticles (NPs); EDTA-ethylenediamine was used as stabilizing agent. Then ex-situ casting technique was used to synthesis nanocomposite (NCP) from Polycarbonate polymer (PC) and the synthesized ZnS NPs. Rietveld enhancement of XRD records demonstrated that synthesized ZnS adjusts cubic zinc blend construction of lattice constant matches 5.345 Å and an average grain size 4nm. PC/ZnS NCP samples were irradiated with  doses in the range 25-230 kGy. The modifications in optical parameters of the  irradiated NCP samples were investigated using UV spectroscopic analysis and CIE color variation technique. Tauc’s model and optical dielectric loss assisted in estimating the optical band gap (Eg) and to recognize the type of electronic transition. Eg decreased from 3.83 to 3.00 eV upon increasing the doses up to 230 kGy; demonstrating the enhancement of the amorphous phase in the NCP. This was conveyed by an increase in the refractive index. Moreover, the color variations were explored using UV transmission spectra and the CIELAB color space methodology. The  radiation causes a reduction in green and blue color components, conveyed by an increase in whiteness. This led to a noteworthy color variation that is applicable in marketable imitation on printing press.

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Gamma irradiation effect towards photoluminescence and optical properties of Makrofol DE 6-2

Cited by 41 publications

References 23 publications

Effect of GaAs pulsed laser on the structure and optical characterization of Makrofol VLG 7-1

Effect of GaAs pulsed laser on the structure and optical characterization of Makrofol VLG 7-1

Structural, Thermal, and Optical Studies of Gamma Irradiated Polyvinyl Alcohol-, Lignosulfonate-, and Palladium Nanocomposite Film

Tailoring the optical properties of PC/ZnS nanocomposite by γ radiation

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