Shape changes in chemoresponsive liquid crystal elastomers
| Autor: | Jennifer M. Boothby, Taylor H. Ware, Hyun Kim |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Chemical substance
02 engineering and technology 010402 general chemistry Smart material 01 natural sciences Optics Materials Chemistry Perpendicular Electrical and Electronic Engineering Composite material Anisotropy Instrumentation chemistry.chemical_classification Chemistry business.industry Metals and Alloys Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Condensed Matter::Soft Condensed Matter Solvent 0210 nano-technology Actuator Axial symmetry business |
| Zdroj: | Sensors and Actuators B: Chemical. 240:511-518 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2016.09.004 |
| Popis: | Liquid crystal elastomers are ordered polymers that undergo reversible, anisotropic shape change in response to a number of stimuli, including heat, light, and solvent. In this study, we design liquid crystal elastomers that actuate both axially and torsionally in response to chemical stimuli. We characterize the response of uniaxially-aligned liquid crystal elastomer films exposed to a variety of chemical stimuli of varying quality. In each solvent, there is a contraction along the alignment direction paired with an expansion in the perpendicular directions. Torsional actuation is generated by patterning a twisted alignment through the thickness of the liquid crystal elastomer. These hierarchically-patterned materials reversibly transition from flat to helical with over 200°/mm of twist in chemical vapor. This response is stable for at least 100 cycles. Ultimately, this chemoresponse is combined with mechanical instability to make high-twist torsional actuators with peak velocities of almost 400 RPM. |
| Databáze: | OpenAIRE |
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