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Author Roberts, Scott A. ♦ Kumar, Satish
Sponsorship USDOE National Nuclear Security Administration (NNSA)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher American Institute of Physics
File Format PDF
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ dielectrics ♦ electric fields ♦ alternating current power transmission ♦ multilayers ♦ dielectric materials
Abstract Experiments by Dickey and Leach show that novel pillar shapes can be generated from electrohydrodynamic instabilities at the interfaces of thin polymer/polymer/air trilayer films. In this paper, we use linear stability analysis to investigate the effect of free charge and ac electric fields on the stability of trilayer systems. Our work is also motivated by our recent theoretical study which demonstrates how ac electric fields can be used to increase control over the pillar formation process in thin liquid bilayer films. For perfect dielectric films, the effect of an AC electric field can be understood by considering an equivalent DC field. Leaky dielectric films yield pillar configurations that are drastically different from perfect dielectric films, and AC fields can be used to control the location of free charge within the trilayer system. This can alter the pillar instability modes and generate smaller diameter pillars when conductivities are mismatched. The results presented may be of interest for the creation of complex topographical patterns on polymer coatings and in microelectronics.
ISSN 10706631
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-12-09
Publisher Place United States
Journal Physics of Fluids
Volume Number 22
Issue Number 12
Organization Univ. of Minnesota, Minneapolis, MN (United States)


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