Slow dynamics and the glass transition in confining systems

Li Min Wang, Fang He, Ranko Richert

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The slow dynamics associated with the structural relaxation of glass forming materials near the glass transition is very sensitive to the effects of small confining geometries. Based upon the experimental results of triplet state solvation dynamics, we explore the extent to which confinement effects can be rationalized solely in terms of interfacial dynamics which are modified relative to the bulk situation. The importance of the interfacial conditions is emphasized by observing the changes due to the surface chemistry, by comparing relaxation times at and further away from the surface, and by studying the effects of 'soft' versus 'hard' confining materials. While 'hard' confinement by porous solids is observed to result in slower dynamics and an increased glass transition temperature T g for propylene glycol, our 4.6 nm nanodroplets suspended in a more fluid environment display faster structural relaxation, equivalent to a reduction of T g as observed in free standing polymer films.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsJ.T. Fourkas, P. Levitz, M. Urbakh, K.J. Wahl
Pages175-186
Number of pages12
Volume790
StatePublished - 2003
EventDynamics in Small Confining Systems - 2003 - Boston, MA, United States
Duration: Dec 1 2003Dec 4 2003

Other

OtherDynamics in Small Confining Systems - 2003
CountryUnited States
CityBoston, MA
Period12/1/0312/4/03

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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    Wang, L. M., He, F., & Richert, R. (2003). Slow dynamics and the glass transition in confining systems. In J. T. Fourkas, P. Levitz, M. Urbakh, & K. J. Wahl (Eds.), Materials Research Society Symposium - Proceedings (Vol. 790, pp. 175-186)