• RANJINI BANDYOPADHYAY

      Articles written in Bulletin of Materials Science

    • Influence of particle size on the thermoresponsive and rheological properties of aqueous poly($N$-isopropylacrylamide) colloidal suspensions

      CHANDESHWAR MISRA SANJAY KUMAR BEHERA RANJINI BANDYOPADHYAY

      More Details Abstract Fulltext PDF

      Thermoresponsive poly($N$-isopropylacrylamide) (PNIPAM) particles of different sizes are synthesized by varying the concentration of sodium dodecyl sulphate (SDS) in a one-pot method. The sizes, size polydispersities and thethermoresponsivity of the PNIPAM particles are characterized by using dynamic light scattering and scanning electron microscopy. It is observed that the sizes of these particles decrease with increase in SDS concentration. Swelling ratios ofPNIPAM particles measured from the thermoresponsive curves are observed to increase with decrease in particle size. This observation is understood by minimizing the Helmholtz free energy of the system with respect to the swelling ratio of the particles. Finally, the dynamics of these particles in jammed aqueous suspensions are investigated by performing rheological measurements.

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