• Quasi-elastic laser light scattering study of polyacrylamide hydrogel immersed in water and salt solutions

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      https://www.ias.ac.in/article/fulltext/pram/075/06/1209-1214

    • Keywords

       

      Polyacrylamide hydrogel; salt solution; diffusion coefficient; light scattering; inhomogeneities.

    • Abstract

       

      Polyacrylamide (PAAm) hydrogels immersed in water and aqueous NaCl solutions were investigated for their structure and dynamics using static and quasi-elastic laser light scattering (QELS) techniques. Ensemble-averaged electric field correlation function $f (q, t)$ obtained from the non-ergodic analysis of intensity-autocorrelation function for PAAm gel immersed in water and in 5 M NaCl showed an exponential decay to a plateau with an initial decay followed by saturation at long times. The value of the plateau was found to depend on NaCl concentration and was higher than that of water. Collective diffusion coefficient, 𝐷, of the polymer network of the hydrogel immersed in water and in different concentrations of NaCl was determined by analysing $f (q, t)$. The measured diffusion coefficient showed linear decrease with increase in concentration of NaCl. The characteristic network parameters were obtained by analyzing $f (q, t)$ with harmonically bound Brownian particle model and from static light scattering studies.

    • Author Affiliations

       

      M Sivanantham1 B V R Tata1

      1. Condensed Matter Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
    • Dates

       
  • Pramana – Journal of Physics | News

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