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Self-assembled nematic colloidal motors powered by light

Journal Article · · Nature Communications
 [1];  [2];  [2];  [3]
  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics; DOE/OSTI
  2. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics
  3. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics; Univ. of Colorado, Boulder, CO (United States). Soft Materials Research Center and Materials Science and Engineering Program, Department of Electrical, Computer, and Energy Engineering; Univ. of Colorado, Boulder, CO (United States). Renewable and Sustainable Energy Institute, National Renewable Energy Laboratory

Biological motors are marvels of nature that inspire creation of their synthetic counterparts with comparable nanoscale dimensions, high efficiency and diverse functions. Molecular motors have been synthesized, but obtaining nanomotors through self-assembly remains challenging. Here we describe a self-assembled colloidal motor with a repetitive light-driven rotation of transparent micro-particles immersed in a liquid crystal and powered by a continuous exposure to unstructured ~1 nW light. A monolayer of azobenzene molecules defines how the liquid crystal’s optical axis mechanically couples to the particle’s surface, as well as how they jointly rotate as the light’s polarization changes. The rotating particle twists the liquid crystal, which changes polarization of traversing light. The resulting feedback mechanism yields a continuous opto-mechanical cycle and drives the unidirectional particle spinning, with handedness and frequency robustly controlled by polarization and intensity of light. Our findings may lead to opto-mechanical devices and colloidal machines compatible with liquid crystal display technology.

Research Organization:
National Renewable Energy Lab., Golden, CO (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1624129
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

Direct light-induced propulsion of vessels filled with a suspension of graphene particles and methanol journal February 2020
A Near‐Infrared Photoactuator Based on Shape Memory Semicrystalline Polymers toward Light‐Fueled Crane, Grasper, and Walker journal August 2019
Control of the Folding Dynamics of Self‐Reconfiguring Magnetic Microbots Using Liquid Crystallinity journal January 2020
Design of Mechanized Nanocomposites for Exploring New Chemical Motions journal August 2019
Light‐Powered Self‐Sustainable Macroscopic Motion for the Active Locomotion of Materials journal April 2019
Elastic colloidal monopoles and reconfigurable self-assembly in liquid crystals journal May 2019
Soft matter from liquid crystals journal January 2019
Electrostatically controlled surface boundary conditions in nematic liquid crystals and colloids journal September 2019
Light-controlled skyrmions and torons as reconfigurable particles journal January 2019
Optically enriched and guided dynamics of active skyrmions journal January 2020
Colloidal plasmonic DNA-origami with photo-switchable chirality in liquid crystals journal January 2019
Light-controlled skyrmions and torons as reconfigurable particles text January 2019
Optically enriched and guided dynamics of active skyrmions text January 2019
Elastic colloidal monopoles and reconfigurable self-assembly in liquid crystals text January 2020

Figures / Tables (10)


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