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Reverse switching of surface roughness in a self-organized polydomain liquid crystal coating

Identifieur interne : 001559 ( Pmc/Corpus ); précédent : 001558; suivant : 001560

Reverse switching of surface roughness in a self-organized polydomain liquid crystal coating

Auteurs : Danqing Liu ; Ling Liu ; Patrick R. Onck ; Dirk J. Broer

Source :

RBID : PMC:4386378

Abstract

Significance

Switching surface topographic patterns in a dynamic way controls properties such as friction, sticking–release, light reflection, aero- and hydrodynamics, self-cleaning, and touch experience. We present a method to make coatings which are initially flat but form a spiked surface structure under light exposure. The surface turns flat again immediately as the light switches off. The polydomain liquid crystal provides a convenient method that makes fabrication of responsive coatings significantly easier than previous methods. The polydomain texture is simulated by finite elements and the topographic deformation can be understood in terms of director-dependent absorption and related changes in local order. Moreover, the dynamic creation of free volume further enhances the surface modulation to the record value of 24% of the film thickness.


Url:
DOI: 10.1073/pnas.1419312112
PubMed: 25775559
PubMed Central: 4386378

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