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Spectroscopie Studies of Confined Molecules Under Shear

Published online by Cambridge University Press:  10 February 2011

Iwao Soga ,
Ali Dhinojwala ,
Yoon-Kyoung Cho  and
Steve Granick
Iwao Soga
Affiliation:
Mitsubishi Chemical Corporation
Ali Dhinojwala
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801
Yoon-Kyoung Cho
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801
Steve Granick
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, IL 61801
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Abstract

We introduce two new techniques with the sensitivity to measure spectroscopie properties of confined molecules under shear. One concerns rheo-optics of fluids in micron-sized gaps. The experimental approach consists in applying periodic shear motion to fluid films confined between parallel plates separated by controllable film thickness from 0.1 to 100 micrometers. A key aspect is the concurrent ability to perform spectroscopie experiments (infrared or dielectric spectroscopy, or x-ray or neutron spectroscopy) of these fluids during flow.

The second technique consists in flow field experiments of polymer adsorption and orientation. The experimental approach is to produce one-directional shear, at rates up to 104 sec−1, past adsorbed polymer layers of thickness less than 0.01 micrometers. The selective augmentation of vibrational modes oriented preferentially along the chain backbone is then used to probe chain orientation in the direction of flow in a laminar flow field.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 89
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

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