New insights into photoactivated volume generation boost surface morphing in liquid crystal coatings.

ABSTRACT: Photoactivated generation of disorder in a liquid crystal network produces free volume that leads to the controlled formation of dynamic corrugations at its surface. The liquid crystal order amplifies the deformation of copolymerized azobenzene, which takes place on molecular length scales, to a micrometre-sized macroscopic phenomenon based on changes in density. We postulate a new mechanism in which continuous oscillating dynamics of the trans-to-cis isomerization of the azobenzene overrules the net conversion, which is currently considered as the origin. This is supported by a significant local density decrease when both the trans and cis isomers are triggered simultaneously, either by dual-wavelength excitation or by the addition of a fluorescent agent converting part of the light to th

SUBMITTER: Liu D 

PROVIDER: S-EPMC4595720 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature