有哪些信誉好的足球投注网站Contact angle hysteresis of cylindrical drops on chemically heterogeneous striped surfaces.pdf
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Contact angle hysteresis of cylindrical drops on chemically heterogeneous striped surfaces
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Contact angle hysteresis of cylindrical drops
on chemically heterogeneous striped surfaces
Masao Iwamatsu 1
Department of Physics, General Education Center, Musashi Institute of
Technology, Setagaya-ku, Tokyo 158-8557, Japan
Abstract
Contact angle hysteresis of a macroscopic droplet on a heterogeneous but flat sub-
strate is studied using the interface displacement model. First, the apparent contact
angle of a droplet on a heterogeneous surface under the condition of constant vol-
ume is considered. By assuming a cylindrical liquid-vapor surface (meniscus) and
minimizing the total free energy, we derive an equation for the apparent contact an-
gle, which is similar but different from the well-known Cassie’s law. Next, using this
modified Cassie’s law as a guide to predict the behavior of a droplet on a heteroge-
neous striped surface, we examine several scenarios of contact angle hysteresis using
a periodically striped surface model. By changing the volume of the droplet, we pre-
dict a sudden jump of the droplet edge, and a continuous change of the apparent
contact angle at the edge of two stripes. Our results suggest that as drop volume is
increased (advancing contact lines), the predominant drop configuration observed is
the one whose contact angle is large; whereas, decreasing drop volume from a large
value (receding contact lines) yields drop configuration that predominantly exhibit
the smaller contact angle.
Key words: contact angle hysteresis, Cassie’s law, striped surface
PACS: 02.60.Pn, 02.70.Tt, 36.40.Mr
1 Introduction
Contact angle hysteresis on a real surface has been investigated experimentally
for many years [1,2]. Usually a higher advancing contact angle and a lower
receding contact angle are observed. This hysteresis has been attributed either
1 E-mail: iwamatsu@ph.ns.musashi-tech.ac.jp, Tel: +81-3-3703-3111 ext.2382, Fax:
+81-3-5707-2222
Preprint s
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