• Structural investigation on gamma-irradiated polyacrylamide hydrogels using small-angle neutron scattering and ultraviolet–visible spectroscopy

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      https://www.ias.ac.in/article/fulltext/pram/086/03/0609-0615

    • Keywords

       

      Polyacrylamide hydrogels; small-angle neutron scattering; UV–visible spectra; gamma irradiation; inhomogeneities.

    • Abstract

       

      Small-angle neutron scattering (SANS) and ultraviolet (UV)–visible spectroscopictechniques are used to investigate the microstructural changes in polyacrylamide (PAAm) hydrogels on gamma irradiation. SANS measurements have revealed the presence of inhomogeneities in nanometre scale and reduction of their size with increase in dose. Analysis of SANS data alsorevealed the increase in the correlation length with increase in dose. The extinction coefficient obtained from the UV–visible spectroscopic studies exhibited $\lambda^{−\beta}$ dependence between 500 and 700 nm and is understood to arise from the existence of scatterers (inhomogeneities) in submicron scale in PAAm hydrogels. The increase in value of exponent $\beta$ with increase in dose indicates that the size of scatterers decrease with increase in dose.

    • Author Affiliations

       

      Sivananatham M1 Tata B V R1 Aswal V K2

      1. Condensed Matter Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
      2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
    • Dates

       
  • Pramana – Journal of Physics | News

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