Dual-responsive, shape-switching bilayers enabled by liquid crystal elastomers

التفاصيل البيبلوغرافية
العنوان: Dual-responsive, shape-switching bilayers enabled by liquid crystal elastomers
المؤلفون: Taylor H. Ware, Jennifer M. Boothby
المصدر: Soft matter. 13(24)
سنة النشر: 2017
مصطلحات موضوعية: Materials science, Bilayer, Modulus, Liquid crystal elastomer, 02 engineering and technology, General Chemistry, Lipid bilayer mechanics, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 3d shapes, 01 natural sciences, 0104 chemical sciences, Crystallography, Perpendicular, Composite material, 0210 nano-technology, Actuator, Anisotropy
الوصف: Materials that change shape are attractive candidates to replace traditional actuators for applications with power or size restrictions. In this work, we design a polymeric bilayer that changes shape in response to both heat and water by the incorporation of a water-responsive hydrophilic polymer with a heat-responsive liquid crystal elastomer. The distinct shape changes based on stimulus are controlled by the molecular order, and consequently the anisotropic modulus, of a liquid crystal elastomer. In response to water, the hydrophilic polymer layer expands, bending the bilayer along the path dictated by the anisotropic modulus of the liquid crystal elastomer layer, which is approximately 5 times higher along the molecular orientation than in perpendicular directions. We demonstrate that by varying the direction of this stiffer axis in LCE films, helical pitch of the swollen bilayer can be controlled from 0.1 to 20 mm. By spatially patterning the stiffer axis with a resolution of 900 μm2, we demonstrate bilayers that fold and bend based on the pattern within the LCE. In response to heat, the liquid crystal elastomer contracts along the direction of molecular order, and when this actuation is constrained by the hydrophilic polymer, this contraction results in a 3D shape that is distinct from the shape seen in water. Furthermore, by using the vitrification of the dry hydrophilic polymer this 3D shape can be retained in the bilayer after cooling. By utilizing sequential exposure to heat and water, we can drive the initially flat bilayer to reversibly shift between 3D shapes.
تدمد: 1744-6848
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9022231b61c089d898f6a725d35a78c
https://pubmed.ncbi.nlm.nih.gov/28466922
رقم الانضمام: edsair.doi.dedup.....d9022231b61c089d898f6a725d35a78c
قاعدة البيانات: OpenAIRE