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Communication: Evidence of dynamic heterogeneity in glassy polymer monolayers from interface microrheology measurements
10.A. Ulman, An Introduction to Ultrathin Organic Films: From Langmuir–Blodgett to Self-Assembly (Academic, London, 1991).
17.J. D. Ferry, Viscoelastic Properties of Polymers (Wiley, New York, 1980).
18.R. G. Larson, The Structure and Rheology of Complex Fluids (Oxford University Press, New York, 1999).
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We have developed a novel nanoparticle tracking based interface microrheology technique to perform in situ studies on confined complex fluids. To demonstrate the power of this technique, we show, for the first time, how in situglass formation in polymers confined at air-water interface can be directly probed by monitoring variation of the mean square displacement of embedded nanoparticles as a function of surface density. We have further quantified the appearance of dynamic heterogeneity and hence vitrification in polymethyl methacrylate monolayers above a certain surface density, through the variation of non-Gaussian parameter of the probes.
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