Multiscale Pattern Generation in Viscoelastic Polymer Films by Spatiotemporal Modulation of Electric Field and Control of Rheology

Title
Multiscale Pattern Generation in Viscoelastic Polymer Films by Spatiotemporal Modulation of Electric Field and Control of Rheology
Author(s)
아슈샬마Partho S. G. Pattade[Partho S. G. Pattade]Indrani Banerjee[Indrani Banerjee]Dipankar Bandyopadhy[Dipankar Bandyopadhy]
Keywords
THIN LIQUID-FILMS; DER-WAALS FORCES; ELECTROHYDRODYNAMIC INSTABILITIES; PILLAR ARRAYS; ELASTIC FILM; NONLINEAR EVOLUTION; SURFACE; RUPTURE; STABILITY; MORPHOLOGY
Issue Date
201101
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v.21, no.2, pp.324 - 335
Abstract
Electric-field-induced hierarchical, multiscale patterning of incompletely cross-linked viscoelastic polydimethylsiloxane (PDMS) films is achieved by spatiotemporal variation of the field, which produces a multiplicity of complex mesopatterns from the same electrode. Experiments and simulations are employed to uncover pathways of hierarchical pattern formation. Spatial modulation of the field is introduced by employing different types of simply patterned electrodes: stripes, elevated concentric circular rings, and box-patterned ridges. Multiscale complex structures consisting of increasingly finer primary, secondary, and tertiary hierarchical structures are fabricated by progressively ramping up the electric field while maintaining the integrity of the already formed structures. The latter is achieved by partially cross-linking the films before patterning, which engenders optimal viscosity to prevent a rapid ripening and coalescence of earlier formed patterns. These multiscale structures can be controlled by the geometry and periodicity of patterned electrodes, the strength of the electric field, and its programmable temporal variation. The PDMS patterns are made permanent by complete cross-linking after a desired multiscale structure is obtained.
URI
http://hdl.handle.net/YU.REPOSITORY/25723http://dx.doi.org/10.1002/adfm.201001206
ISSN
1616-301X
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공과대학 > 기계공학부 > Articles
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