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Synchrotron X-Ray Scattering Studies of the Surface Structure and Dynamics of Liquids and Liquid Films

Published online by Cambridge University Press:  26 February 2011

Hyunjung Kim ,
Zhang Jiang ,
Heeju Lee ,
Young Joo Lee ,
Xuesong Jiao ,
Chunhua Li ,
Laurence Lurio ,
Xuesong Hu ,
Jyotsana Lal  and
Miriam Rafailovich
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Hyunjung Kim
Affiliation:
[email protected], Sogang University, Physics, 1 Sinsu-Dong, Mapo_Gu,, Seoul, N/A, N/A, Korea, Republic of, 82-2-705-8431, 82-2-701-8431
Zhang Jiang
Affiliation:
[email protected]
Heeju Lee
Affiliation:
[email protected]
Young Joo Lee
Affiliation:
[email protected]
Xuesong Jiao
Affiliation:
[email protected]
Chunhua Li
Affiliation:
[email protected]
Laurence Lurio
Affiliation:
[email protected]
Xuesong Hu
Affiliation:
[email protected]
Jyotsana Lal
Affiliation:
[email protected]
Miriam Rafailovich
Affiliation:
[email protected]
Sunil K Sinha
Affiliation:
[email protected]
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Abstract

The dynamics of surface fluctuations in thin supported polystyrene films have been investigated using x-ray photon correlation spectroscopy (XPCS) in reflection geometry. The results from the films thicker than four times of the radius of gyration (Rg) of polystyrene show the behavior of the capillary waves expected in viscous liquid. However, thinner films show a deviation indicating the need to account for viscoelasticity. Theoretical considerations with viscoelastic liquid model has been performed by introducing frequency dependent viscosity and compared with Fredrickson’s brush model (Macromolecules, 25, 2882 (1992)). The theory has been extended to the surface and interfacial modes in a bilayer film system. The results will be discussed in terms of surface tension, viscosity, and shear modulus.

Keywords

polymerfilmelastic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 899: Symposium N – Dynamics in Small Confining Systems VIII , 2005 , 0899-N09-01
Copyright
Copyright © Materials Research Society 2006

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References

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