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    Dynamic elasticity of films formed by poly(N-isopropylacrylamide) microparticles on a water surface

    Year: 2017

    Journal: Colloid J., Volume 79, SEP, page 571–576

    Authors: Akentiev, A. V.; Rybnikova, G. S.; Novikova, A. A.; Timoshen, K. A.; Zorin, I. M.; Noskov, B. A.

    Organizations: Russian Foundation for Basic Research; National Science Counsel of Taiwan [16-53-52034_MNT_a]

    Surface dilatational dynamic elasticity epsilon of films formed by cross-linked poly(N-isopropylacrylamide) microparticles on a water/air interface has been determined as a function of polymer surface concentration I". The experimental dependences exhibit two maxima of epsilon at surface pressures pi of nearly 6 and 35 mN/m. In the region of the second maximum, the pattern of the dependence is governed by a method used to vary I". At pi > 25 mN/m, film compression leads to the formation of a metastable monolayer, while the gradual addition of a microparticle dispersion results in the establishment of equilibrium between the monolayer and surface aggregates. In the region of pi values corresponding to the second maximum of epsilon, slow relaxation processes with a characteristic time substantially longer than 10 s occur in the system. At pi > 35 mN/m, the film collapses due to the displacement of microgel particles from the water surface.
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