The dynamics of binary mixtures of nonpolymeric viscoelastic liquids as studied by quasielastic light scattering

Article abstract of DOI:10.1063/1.458251

In this paper we report quasielastic light-scattering experiments of the compatible binary mixture of simple viscoelastic liquids made up of o-terphenyl as one component and newly synthesized model materials, 1,1-di(paramethoxyphenyl)-cyclo-hexan and 1,1-di(paramethoxyphenyl, metamethyl)-cyclohexan, as the other components.The measurements were done in a wide temperature range above T_g (ca.T_g + 100 K) of the mixtures and in a volume fraction range up to φ = 0,5 of bis-cresol-cyclohexane-dimethylether and bis-phenol-cyclohexane-dimethylether.We have found that the measured dynamics is governed by three effects: At short times we observe the dynamics of the density fluctuations of the system characterized by a broad distribution of relaxation times, which can be scaled to a masterplot taking the T_g of the mixtures into account.At longer times we observe two translational diffusion processes whose decay is single exponential with a characteristic time proportional to q^-2, q being the scattering vector.The faster one is attributed to the interdiffusion coefficient of the system.The second, slower mode is related to the motion of dynamic clusters which have their origin in a spatial inhomogeneity of the samples.The mean cluster diameter is about 1000 Angstroem, thus in any case the occurrence of the slow mode is accompanied by a strong increase of the elastically scattered intensity towards small scattering angles.This mode also appears in pure components.We relate its intensity to the fluctuations of an order parameter, usually introduced to describe the glassy state.

Full text of DOI:10.1063/1.458251

The dynamics of binary mixtures of nonpolymeric viscoelastic liquids as studied by
quasielastic light scattering
B. Gerharz, G. Meier, and E. W. Fischer
Citation: The Journal of Chemical Physics 92, 7110 (1990); doi: 10.1063/1.458251
View online: http://dx.doi.org/10.1063/1.458251
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/92/12?ver=pdfcov
Published by the AIP Publishing
Articles you may be interested in
On the scattering phenomena for various kinds of polarized light in a nonpolar binary liquid mixture
J. Chem. Phys. 106, 4409 (1997); 10.1063/1.473487
Thermally excited liquid surface waves and their study through the quasielastic scattering of light
Am. J. Phys. 64, 758 (1996); 10.1119/1.18174
Mutual diffusion in binary polymer mixtures as measured by dynamic light scattering
J. Chem. Phys. 86, 5174 (1987); 10.1063/1.452638
Studies of viscous drag in binary liquid mixtures by quasielastic light scattering
J. Chem. Phys. 58, 1054 (1973); 10.1063/1.1679286
LightScattering Studies of Critical Opalescence in Binary Liquid Mixtures. IV Paraffins in β,β′Dichlorodiethyl
Ether
J. Chem. Phys. 50, 3986 (1969); 10.1063/1.1671659
This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
152.2.176.242 On: Mon, 15 Dec 2014 10:33:12

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
52.2.176.242 On: Mon, 15 Dec 2014 10:33:12
1