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Effect of swift heavy ions irradiation on physicochemical and dielectric properties of chitosan and chitosan-Ag nanocomposites
Effect of swift heavy ions irradiation on physicochemical and dielectric properties of chitosan and chitosan-Ag nanocomposites
- Source :
- Radiation Physics and Chemistry. 181:109288
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Self-sustained films of biodegradable chitosan (CS) and chitosan-Ag nanocomposites (CSN) were prepared by chemical route followed by C+5 and Ni+7 ions irradiation with varying fluences. The crystallite size decreased from 11.1 to 2.7 nm for CS and 17.6 to 14.2 nm for CSN with increasing ions fluence as observed from the analysis of X-ray Diffraction (XRD) spectra. ATR-FTIR spectra revealed assorted vibrational modes and degradation of polymeric chains in both, CS and CSN matrices upon irradiation. The molecular interactions between main and side-chain functional groups impeded due to nanoparticles confining effects. MeV ions yield low-molecular-weight fragments with degassing of some volatile gaseous species during irradiation. An acute amendment in absorption spectra ascribed to change in surface color and differential absorbance at the wavelength of 370 nm showing blocking of UV radiation. The formation of conjugated linkages and carbonization of CS and CSN matrices lead to decrease in bandgap. Modifications in the physicochemical properties were found to be in persuasive association with changes in frequency-dependent dielectric responses. The shape parameter was moderately decreased and indicating non-Debye relaxation. The conductivity of CS and CSN matrices enhanced and follows the universal dielectric response. The amendment in surface morphology was also revealed upon irradiation.
- Subjects :
- Radiation
Nanocomposite
Materials science
Absorption spectroscopy
010308 nuclear & particles physics
Nanoparticle
Dielectric
Photochemistry
01 natural sciences
030218 nuclear medicine & medical imaging
Dielectric spectroscopy
Absorbance
03 medical and health sciences
0302 clinical medicine
0103 physical sciences
Irradiation
Crystallite
Subjects
Details
- ISSN :
- 0969806X
- Volume :
- 181
- Database :
- OpenAIRE
- Journal :
- Radiation Physics and Chemistry
- Accession number :
- edsair.doi...........3e37870fd6a3b7dd00355201b7a48404
- Full Text :
- https://doi.org/10.1016/j.radphyschem.2020.109288