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The drag on needles moving in a Langmuir monolayer

Published online by Cambridge University Press:  27 January 2004

TH. M. FISCHER
Affiliation:
Department of Chemistry and Biochemistry, The Florida State University, Tallahassee, FL 32306, [email protected]

Abstract

The motion of membrane-bound objects is important in many aspects of biology and surface chemistry. Here we derive some general relations for objects moving in a surface film overlying a fluid of depth H. A solution to the problem of the drag can be obtained from a two-dimensional system of integral equations. Here we focus on the problem of an ideal needle moving edge-on (in the direction of its tip) or broadside-on (perpendicular to the direction of the tip). It is shown that in comparison to the drag on a circular disk a new scaling regime of the drag on a needle arises when the ratio between surface shear viscosity and subphase viscosity $\eta_s/\eta$ is smaller than the length of the needle.

Type
Papers
Copyright
© 2004 Cambridge University Press

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