Dynamics of 8CB confined into porous silicon probed by incoherent neutron backscattering experiments

Regis Guegan, R. Lefort, W. Béziel, Denis Morineau, M. Guendouz, B. Frick

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Confinement in the nanochannels of porous silicon strongly affects the phase behavior of the archetype liquid-crystal4-n-octyl-4-cyanobiphenyl (8CB). A very striking phenomenon is the development of a short-range smectic order, which occurs on a very broad temperature range. It suggests in this case that quenched disorder effects add to usual finite size and surface interaction effects. We have monitored the temperature variation of the molecular dynamics of the confined fluid by incoherent quasielastic neutron scattering. A strongly reduced mobility is observed at the highest temperatures in the liquid phase, which suggests that the interfacial molecular dynamics is strongly hindered. A continuously increasing slowdown appears on cooling together with a progressive growth of the static correlation length.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
JournalEuropean Physical Journal: Special Topics
Volume141
Issue number1
DOIs
Publication statusPublished - 2007 Feb 1
Externally publishedYes

Fingerprint

Porous silicon
Backscattering
porous silicon
backscattering
Neutrons
neutrons
Molecular dynamics
Incoherent scattering
molecular dynamics
incoherent scattering
Experiments
Liquids
Phase behavior
Neutron scattering
Temperature
surface reactions
liquid phases
neutron scattering
disorders
Cooling

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Dynamics of 8CB confined into porous silicon probed by incoherent neutron backscattering experiments. / Guegan, Regis; Lefort, R.; Béziel, W.; Morineau, Denis; Guendouz, M.; Frick, B.

In: European Physical Journal: Special Topics, Vol. 141, No. 1, 01.02.2007, p. 29-34.

Research output: Contribution to journalArticle

Guegan, Regis ; Lefort, R. ; Béziel, W. ; Morineau, Denis ; Guendouz, M. ; Frick, B. / Dynamics of 8CB confined into porous silicon probed by incoherent neutron backscattering experiments. In: European Physical Journal: Special Topics. 2007 ; Vol. 141, No. 1. pp. 29-34.
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