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PROOF COPY 025303RSI Stray capacitance contribution to the electrical measurement of contact
 

Summary: PROOF COPY 025303RSI
PROOF
COPY
025303RSI
Stray capacitance contribution to the electrical measurement of contact
angles and areas
Anthony Quinna)
and Phil Attardb)
School of Chemistry, University of Sydney, NSW 2006, Australia
Received 1 October 2002; accepted 28 October 2002
The capacitance of two parallel disks of finite unequal size is calculated by a variational procedure
based on the electrostatic energy. It is found that effects due to the edges and the asymmetry can be
substantial unless the radii of the disks are very much greater than the thickness of the dielectric
interlayer. The trends predicted by the calculations are confirmed by measurements of the
capacitance of electrodes deposited on polymer films and of water droplets. The implications for the
electrical measurement of the contact angle or contact area of a droplet, and for the dependence of
the contact angle on the applied potential in electrowetting, are discussed. 2003 American
Institute of Physics. DOI: 10.1063/1.1537046
I. INTRODUCTION
The balance of forces at the three-phase line determines

  

Source: Attard, Phil - School of Chemistry, University of Sydney

 

Collections: Chemistry