Related Experiment Video
Updated: Jul 26, 2026
12:21
Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
Published on: February 6, 2016
12.6K
Dynamic Liquid Crystal Elastomers for Body Heat- and Sunlight- Driven Self-Sustaining Motion via Material-Structure
Qing Liu1, Zhi-Chao Jiang1, Xue Jiang2
1School of Mechanical Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Angewandte Chemie (International Ed. in English)
|February 21, 2025
Summary
Researchers developed a novel self-sustaining actuator using carbon nanotube-doped liquid crystal elastomers (LCEs). This material enables high actuation strain rates at low temperatures, powering devices with ambient heat or sunlight.
Area of Science:
- Materials Science
- Polymer Chemistry
- Soft Robotics
Background:
- Liquid crystal elastomers (LCEs) offer safe, practical self-sustained actuation using low-energy sources.
- A key challenge is achieving high actuation strain rates near ambient temperatures, especially for LCEs with low nematic-to-isotropic transition temperatures (Tni).
Purpose of the Study:
- To develop LCE-based actuators capable of stable self-sustaining motion powered by low-energy sources.
- To overcome the trade-off between low Tni and high actuation performance in LCEs.
Main Methods:
- Synthesis of a novel carbon nanotube-doped LCE with reversible Diels-Alder crosslinks (DALCE).
- Fabrication of DALCE into specific structures like twisted-and-coiled or bimorph shapes.
- Investigation of material-structure synergy to enhance actuation properties.
Main Results:
- The developed DALCE exhibited a low Tni while maintaining high actuation strain rates.
- Achieved self-rolling, self-breathing, and autonomous twisting-untwisting movements.
- Actuation was powered by ambient/body temperature or natural sunlight.
Conclusions:
- The material-structure synergy in DALCE successfully addresses the challenge of low-energy self-sustained actuation.
- This actuator design demonstrates potential for biomedical applications and naturally powered devices.
Related Concept Videos
01:05Static and Kinetic Frictional Force
One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
However, if two systems are in contact and are stationary relative to one...
01:26Kinetic Friction
Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car begins...
01:25Energy Supply for Muscle Contraction
Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
01:14Design Example: Resistive Touchscreen
A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
01:13Kinetic Energy for a Rigid Body
Imagine a solid object involved in a general planar movement, with its center of mass pinpointed at a spot labeled G. The object's kinetic energy relative to an arbitrary point A can be quantified for each of its particles - the ith particle in this case. This measurement is achieved through the employment of the relative velocity definition. The position vector, known as rA, extends from point A to the mass element i.
01:18Fluid Movement Between Compartments
The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...