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|Abstract:||Measuring polymer surface dynamics remains a formidable challenge of critical importance to applications ranging from pressure-sensitive adhesives to nanopatterning, where interfacial mobility is key to performance. Here, we introduce a methodology of Brillouin light spectroscopy to reveal polymer surface mobility via nanoparticle vibrations. By measuring the temperature-dependent vibrational modes of polystyrene nanoparticles, we identify the glass-transition temperature and calculate the elastic modulus of individual nanoparticles as a function of particle size and chemistry. Evidence of surface mobility is inferred from the first observation of a softening temperature, where the temperature dependence of the fundamental vibrational frequency of the nanoparticles reverses slope below the glass-transition temperature. Beyond the fundamental vibrational modes given by the shape and elasticity of the nanoparticles, another mode, termed the interaction-induced mode, was found to be related to the active particle–particle adhesion and dependent on the thermal behavior of nanoparticles.|
|Citation:||Kim, H, Cang, Y, Kang, E, Graczykowski, B, Secchi, M, Montagna, M, Priestley, RD, Furst, EM, Fytas, G. (2018). Direct observation of polymer surface mobility via nanoparticle vibrations. Nature Communications, 9, doi:10.1038/s41467-018-04854-w|
|Pages:||1 - 11|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||Nature Communications|
|Version:||Final published version. This is an open access article.|
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