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  • Title: Bulk modulus of poly(N-isopropylacrylamide) microgels through the swelling transition.
    Author: Sierra-Martín B, Laporte Y, South AB, Lyon LA, Fernández-Nieves A.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2011 Jul; 84(1 Pt 1):011406. PubMed ID: 21867170.
    Abstract:
    We report measurements of the bulk modulus of individual poly(N-isopropylacrylamide) microgels along their swelling transition. The modulus is determined by measuring the volume deformation of the microgel as a function of osmotic pressure using dextran solutions. We find that the modulus softens through the transition, displaying a nonmonotonous behavior with temperature. This feature is correctly reproduced by the theory of Flory for polymer gels, once the concentration dependence of the solvency parameter is properly incorporated.
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