Imperial College London
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ProfessorJoaoCabral

Faculty of Engineering, Department of Chemical Engineering

Professor of Soft Matter
 
 
 
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Contact

 

+44 (0)20 7594 5571j.cabral Website

 
 
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Assistant

 

Mrs Sarah Payne +44 (0)20 7594 5567

 
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Location

 

517AACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pellegrino:2020:10.1039/c9sm02124h,
author = {Pellegrino, L and Khodaparast, S and Cabral, JT},
doi = {10.1039/c9sm02124h},
journal = {Soft Matter},
pages = {595--603},
title = {Orthogonal wave superposition of wrinkled, plasma-oxidised, polydimethylsiloxane surfaces},
url = {http://dx.doi.org/10.1039/c9sm02124h},
volume = {16},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We report a versatile approach to generate 2D dual-frequency patterns on soft substrates by superposition of 1D single-frequency wrinkles. Wave superposition is achieved by applying sequential orthogonal strains to elastomeric coupons, as opposed to the application of a (simultaneous) biaxial strain field. First, a 1D wrinkling pattern is induced by the well-known mechanical instability of a bilayer formed by oxygen plasma-oxidation of a (pre-strained) polydimethylsiloxane elastomer. The wrinkled surface formed upon strain release is then replicated to obtain a stress-free substrate, and stretched in the direction perpendicular to the first generation. Subsequent plasma exposure and mechanical relaxation (with independent process parameters) yield a prescribed second-generation wrinkling, whose profile and dependence on the first generation we examine in detail. By independently varying plasma oxidation and strain parameters in both directions, we demonstrate the formation of a wide array of topographies, including arrays of symmetric 2D checkerboard patterns with exceptional area coverage with respect to those formed by simultaneous 2D wrinkling. While the resulting topographies cannot be explained in terms of a simple orthogonal wave superposition, we show that, by accounting for the orthogonal prestrain experienced by the first wrinkling generation, the resulting 2D patterns can be readily calculated from 1D wrinkling behaviour.
AU  - Pellegrino,L
AU  - Khodaparast,S
AU  - Cabral,JT
DO  - 10.1039/c9sm02124h
EP  - 603
PY  - 2020///
SN  - 1744-683X
SP  - 595
TI  - Orthogonal wave superposition of wrinkled, plasma-oxidised, polydimethylsiloxane surfaces
T2  - Soft Matter
UR  - http://dx.doi.org/10.1039/c9sm02124h
UR  - https://www.ncbi.nlm.nih.gov/pubmed/31776531
UR  - http://hdl.handle.net/10044/1/76249
VL  - 16
ER  -
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