Methyl group dynamics in a confined glass View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2003-11

AUTHORS

A.J. Moreno, J. Colmenero, A. Alegría, C. Alba-Simionesco, G. Dosseh, D. Morineau, B. Frick

ABSTRACT

We present a neutron scattering investigation on methyl group dynamics in glassy toluene confined in mesoporous silicates of different pore sizes. The experimental results have been analysed in terms of a barrier distribution model, such a distribution following from the structural disorder in the glassy state. Confinement results in a strong decreasing of the average rotational barrier in comparison to the bulk state. We have roughly separated the distribution for the confined state in a bulk-like and a surface-like contribution, corresponding to rotors at a distance from the pore wall respectively larger and smaller than the spatial range of the interactions which contribute to the rotational potential for the methyl groups. We have estimated a distance of 7 A as a lower limit of the interaction range, beyond the typical nearest-neighbour distance between centers-of-mass (4.7 A). More... »

PAGES

43-46

Identifiers

URI

http://scigraph.springernature.com/pub.10.1140/epjed/e2003-01-011-7

DOI

http://dx.doi.org/10.1140/epjed/e2003-01-011-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1010536957

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15011013


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