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Phase Separation of a Binary Liquid System in Controlled-Pore Glass

Published online by Cambridge University Press:  01 February 2011

S. Schemmel ,
D. Akcakayiran ,
G. Rother ,
A. Brulet ,
B. Farago ,
Th. Hellweg  and
G.H. Findenegg
S. Schemmel
Affiliation:
Stranski Laboratorium, Technical University Berlin, 10623 Berlin, Germany
D. Akcakayiran
Affiliation:
Stranski Laboratorium, Technical University Berlin, 10623 Berlin, Germany
G. Rother
Affiliation:
Stranski Laboratorium, Technical University Berlin, 10623 Berlin, Germany
A. Brulet
Affiliation:
LLB, CEA-CNRS Saclay, France
B. Farago
Affiliation:
ILL, Grenoble, France
Th. Hellweg
Affiliation:
Stranski Laboratorium, Technical University Berlin, 10623 Berlin, Germany
G.H. Findenegg
Affiliation:
Stranski Laboratorium, Technical University Berlin, 10623 Berlin, Germany
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Abstract

The phase separation behaviour and the dynamics of concentration fluctuations of binary liquid mixtures are strongly influenced by confinement effects. We have investigated this confinement effect for the binary system isobutyric acid iBA + D2O imbibed into a mesoporous silica glass (CPG-10). The dynamics of the mixture are studied in the one-phase region as well as in the phase-separated state by means of neutron spin echo spectroscopy (NSE). Moreover, the averaged structures of the liquid are explored by means of small angle neutron scattering (SANS) leading to a length scale 4 < ξ < 9 nm for the fluctuations. The associated effective diffusion coefficient Deff as obtained for NSE is found to decrease with temperature ny nearly one order of magnitude in the temperature range from 75°C to 25°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 790: Symposium P – Dynamics in Small Confining Systems–2003 , 2003 , P7.2
Copyright
Copyright © Materials Research Society 2004

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References

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