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.

Direct observation of polymer surface mobility via nanoparticle vibrations / Kim, Hojin; Cang, Yu; Kang, Eunsoo; Graczykowski, Bartlomiej; Secchi, Maria; Montagna, Maurizio; Priestley, Rodney D.; Furst, Eric M.; Fytas, George. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 9:1(2018), p. 2918. [10.1038/s41467-018-04854-w]

Direct observation of polymer surface mobility via nanoparticle vibrations

Secchi, Maria;Montagna, Maurizio;
2018

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.
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Kim, Hojin; Cang, Yu; Kang, Eunsoo; Graczykowski, Bartlomiej; Secchi, Maria; Montagna, Maurizio; Priestley, Rodney D.; Furst, Eric M.; Fytas, George
Direct observation of polymer surface mobility via nanoparticle vibrations / Kim, Hojin; Cang, Yu; Kang, Eunsoo; Graczykowski, Bartlomiej; Secchi, Maria; Montagna, Maurizio; Priestley, Rodney D.; Furst, Eric M.; Fytas, George. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 9:1(2018), p. 2918. [10.1038/s41467-018-04854-w]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/230251
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