Multiresponsive polymeric microstructures with encoded predetermined and self-regulated deformability.
Proc Natl Acad Sci U S A. 2018 Dec 04;:
Authors: Yao Y, Waters JT, Shneidman AV, Cui J, Wang X, Mandsberg NK, Li S, Balazs AC, Aizenberg J
Abstract
Dynamic functions of biological organisms often rely on arrays of actively deformable microstructures undergoing a nearly unlimited repertoire of predetermined and self-regulated reconfigurations and motions, most of which are difficult or not yet possible to achieve in synthetic systems. Here, we introduce stimuli-responsive microstructures based on liquid-crystalline elastomers (LCEs) that display a broad range of hierarchical, even mechanically unfavored deformation behaviors. By polymerizing molded prepolymer in patterned magnetic fields, we encode any desired uniform mesogen orientation into the resulting LCE microstructures, which is then read out upon heating above the nematic-isotropic transition temperature (TN-I) as a specific prescribed deformation, such as twisting, in- and out-of-plane tilting, stretching, or contraction. By further introducing light-responsive moieties, we demonstrate unique multifunctionality of the LCEs capable of three actuation modes: self-regulated bending toward the light source at T < TN-I, magnetic-field-encoded predetermined deformation at T > TN-I, and direction-dependent self-regulated motion toward the light at T > TN-I We develop approaches to create patterned arrays of microstructures with encoded multiple area-specific deformation modes and show their functions in responsive release of cargo, image concealment, and light-controlled reflectivity. We foresee that this platform can be widely applied in switchable adhesion, information encryption, autonomous antennae, energy harvesting, soft robotics, and smart buildings.
PMID: 30514819 [PubMed - as supplied by publisher]
from PubMed via alexandrossfakianakis on Inoreader https://ift.tt/2KXNsq7
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