Expansion Of Capillary Force Range By
Probe-tip Curvature
Author(s)
K. J. Obata, S. Saito & K. Takahashi
Abstract
This paper deals with the expansion of capillary force range with a concave probetip
for micromanipulation. From numerical simulation,we found the following; the
concave probe-tip can generate a much larger capillary than a flat one, provided
it is designed to fit the convex surface of the object; the more wettable a material
is, the greater capillary force it can generate; the magnified capillary force can be
reduced/controlled by liquid volume regulation. To prove this, we measured the
capillary force for a given gap distance between a spherical object and a concave
surface coaxially fabricated in a cylinder.We used three different materials (glass,
stainless steel, and polytetrafluoroethylene) to check the influence of contact
angles. The liquid volumes were given in the range from one hundredth- to
ten-times the radius of the cubed sphere. Comparison between our experimental
data and the theoretical prediction expressed in the normalized form shows good
agreement, if the liquid volume is larger than a certain value. This suggests that
micromanipulation by capillary force should be more practical by using probes
with concave tips specifically designed for the object.
Keywords: micromanipulation, hydrostatics, liquid bridge, capillary force.
1 Introduction
Recently, micromanipulation techniques have been in demand to fabricate
highly functional micro-devices or micro-electro-mechanical-systems(MEMS). In
micromanipulation, the influence of adhesional force is extremely large compared
to gravitational force [1, 2]. Furthermore, adhesional force has large dispersion
Keywords
micromanipulation, hydrostatics, liquid bridge, capillary force.
Related Book
Other papers in this volume
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