Gamma-ray irradiation-induced variations in structural and electrical properties of PVP neutral polymer in water

Belaidi, Amal; Guettari, Moez; Tajouri, Tahar

doi:10.1007/s10967-019-06803-3

Cited by 9 publications

(2 citation statements)

References 46 publications

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“…On the other hand, as X-ray radiation dose are raised, the optical absorption edge shows an increasing tendency [41]. An illustration shows that the absorption edge shifts toward the longer wavelength as the 2.303A…”

Section: Uv/vis Studiesmentioning

confidence: 98%

Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

Zaki,

Rashad,

Elkalashy

et al. 2023

Opt Quant Electron

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In this article, the effects of 6 MeV energy of X-ray radiation on polycarbonate polymeric lms were investigated. The induced alterations are assessed using several methodologies: FTIR spectroscopy, contact angle measurements, surface roughness assessment, UV/Vis spectroscopy, and luminescence emission spectroscopy. As well, using the basic sets in the ground state of the polycarbonate structure, the vibrational analysis has been carried out using the density functional theory (DFT). The FTIR spectra display that the X-ray irradiation produces surface chemical alterations in the irradiated lms due to successive degradation mechanisms due to the decrease in the detected band peaks. The basis sets that were calculated using the DFT method are in good agreement with the experimentally observed spectra.The frontier molecular orbital energies are used to assess the molecule's energy gap (HOMO-LUMO). The value of the frontier energy gap re ects the chemical reactivity and intermolecular charge transfer that take place within the molecule. The surface wettability behaviors were amended due to the decrease in the contact angle values of irradiated lms. This leads to an increase in the surface roughness and surface free energy. X-ray irradiation can enhance the surface goodness of polycarbonate lms and control their surface properties to be used in biocompatibility applications. The optical properties of irradiated lms show modi cations in the studied optical parameters. The absorbance spectra exhibited a shift in the absorption edge of the irradiated samples compared with the pristine one. This shift indicates the decreases in the band gap energy of irradiated samples. For direct transitions, the band gap decreased from 4.03 to 3.125 eV, and for indirect transitions, it decreased from 3.5 0 to 2.65 eV. This result was attributable to the formation of defects and the creation of complex charge transfer due to Xray irradiation. The photoluminescence emission spectra show that the peak intensities are obviously in uenced by increasing the irradiation doses. This is attributable to the band-band transition, donor/acceptor pairs, and bound to free transition, which correlated to the received absorbed dose.of oxidation products, polar components, creation of ionic chemical species, gaseous and water molecules production, loss of volatile fragments and the generation of free radicals that can cause scission and/or cross-linking mechanisms [11][12][13]. The two mechanisms are reliant on the polymer's nature and the environmental conditions, and consequently, scissioning and crosslinking are competing phenomena. Moreover, the natural behaviors of these changes in the irradiated polymeric lms depend on the interfering factors, like the composition of the polymer and its molecular weight, and also on the types of radiation and its energy [14][15][16]. Polymers are gaining popularity due to their numerous advantages, including ease of processing, and several degrees of elasticity or stiffness. They are also more affordable overall d...

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Section: Uv/vis Studiesmentioning

confidence: 98%

Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

Zaki,

Rashad,

Elkalashy

et al. 2023

Opt Quant Electron

View full text Add to dashboard Cite

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“…First, the primary radicals of water (species 2−8) are obtained. The high energy radiation produces the radiolysis of water as the key step leading to cross-linking (15,20). The irradiation of PVA (see compound 1) led to the formation of three combinations of PVA radicals (precursors 10−12), and a carbonyl radical (see precursor 13).…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

Synthesis by gamma irradiation of hyaluronic acid-polyvinyl alcohol hydrogel for biomedical applications

Godoy-Alvarez

González‐Torres

Giraldo-Gómez

et al. 2021

Cell Mol Biol (Noisy-le-grand)

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Hyaluronic acid (HA) is one of the most attractive natural polymers employed in biomaterials with biological applications. This polysaccharide is found in different tissues of the body because it is a natural component of the extracellular matrix; furthermore, it has crucial functions in cell growth, migration, and differentiation. Since its biological characteristics, HA has been utilized for the new biomaterial's development for tissue engineering, such as hydrogels.These hydrophilic macromolecular networks have gained significant attention due to their unique properties, making them potential candidates to be applied in biomedical fields. Different mechanisms to obtain hydrogels have been described. However, the research of new non-toxic methods has been growing in recent years. In this study, we prepared a new hydrogel of HA and polyvinyl alcohol by the cost-effective technique of cross-linking by gamma irradiation. The hydrogel was elaborated for the first time and was characterized by several methods such as Fourier Transform Infrared Spectroscopy, Differential Scanning Calorimetry, Thermogravimetric Analysis, and Scanning Electron Microscopy. Likewise, we evaluated the cytotoxicity of the biomaterial and its influence on cell migration in human fibroblasts. Furthermore, we provide preliminary evidence of the wound closure effect in a cellular wound model. The novel hydrogel offers an increase of HA stability with the potential to expand the useful life of HA in its different medical applications.

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Gamma irradiation induced microstructural modification and electrical conductivity of bakelite resistive plate chamber material

Kumar

Raghavendra

Hegde

et al. 2021

J Radioanal Nucl Chem

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Gamma-ray irradiation-induced variations in structural and electrical properties of PVP neutral polymer in water

Cited by 9 publications

References 46 publications

Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

Assessment the exposure effects of polycarbonate with X-ray radiation using spectroscopic techniques and molecular modeling calculations

Synthesis by gamma irradiation of hyaluronic acid-polyvinyl alcohol hydrogel for biomedical applications

Gamma irradiation induced microstructural modification and electrical conductivity of bakelite resistive plate chamber material

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