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A two-dimensional Couette viscometer for Langmuir monolayers

Rev. Sci. Instrum. 69, 3568 (1998); doi:10.1063/1.1149139

Issue Date: October 1998

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R. S. Ghaskadvi and Michael Dennin
Department of Physics and Astronomy, University of California at Irvine, Irvine, California 92697-4575
We have developed an apparatus that is capable of simultaneously measuring the viscosity of Langmuir monolayers and visualizing their flow. It consists of a circular trough with a nearly circular elastic barrier that can be rotated to generate two-dimensional Couette flow. The "inner cylinder" is a Teflon knife-edge disk that is hung by a thin wire. The torque on the inner cylinder is determined by measuring the angular displacement of the disk. A stepper motor controls the barrier rotation. Viscosity can be measured in two different ways: by oscillating the torsion pendulum and by generating Couette flow. The dynamic viscosity range of the apparatus is 10–4 < eta < 103 g/s. Typical shear rates range from 10–4 to 101 s – 1. A Brewster angle microscope is mounted on the apparatus. This is used to study various properties of the monolayer such as: velocity profiles, domain shape during shear, domain relaxation after shear, and size distribution of domains. ©1998 American Institute of Physics.
History: Received 5 June 1998; accepted 22 July 1998
Permalink: http://link.aip.org/link/?RSINAK/69/3568/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.18.+p
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) LangmuirBlodgett films
  • YEAR: 1998

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ISSN:
0034-6748 (print)   1089-7623 (online)
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REFERENCES (21)
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