Related Experiment Video
Updated: Sep 9, 2025
07:34
A Simple Stimulatory Device for Evoking Point-like Tactile Stimuli: A Searchlight for LFP to Spike Transitions
Published on: March 25, 2014
10.0K
Spatially patterned stiffness variation in a light-triggered jumper for symmetry breaking and high snap-through
Min Jeong Hahm1,2, Woongbi Cho1,2, Jisoo Jeon3
1Department of Organic and Nano Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
Science Advances
|August 29, 2025
Summary
Researchers developed a novel method for efficient photomechanical jumping using patterned stiffness variations in azobenzene-functionalized liquid-crystalline polymers (Azo-LCPs). This technique overcomes previous limitations, enabling controlled directional and vertical movement with enhanced energy release.
Area of Science:
- Materials Science
- Soft Robotics
- Photomechanics
Background:
- Soft material-based snap-through systems offer amplified force output but face efficiency challenges due to curvature-stiffness trade-offs.
- Improving snap-through energy release efficiency is critical for advanced actuator designs.
Purpose of the Study:
- To address the efficiency limitations in snap-through systems by spatially programming stiffness variations.
- To achieve efficient photomechanical jumping in azobenzene-functionalized liquid-crystalline polymers (Azo-LCPs).
Main Methods:
- Spatial programming of stiffness variation in Azo-LCPs to induce localized curvature and enhance photomechanical strain responsivity.
- Utilizing symmetry in stiffness variation for directional or vertical jumping.
- Integrating patterned stiffness variation with geometric asymmetry for dual-mode jumping (vertical and horizontal).
- Finite element simulations to corroborate stress accumulation behaviors.
Main Results:
- Demonstrated efficient photomechanical jumping by overcoming the initial curvature and stiffness trade-off.
- Achieved directional and vertical jumping through strategic placement of rigid regions.
- Enabled both vertical and horizontal jumping within a single structure by combining patterned stiffness with geometric asymmetry.
- Observed sequential and consecutive jumps under continuous light exposure.
Conclusions:
- Spatial programming of stiffness variation is an effective strategy to enhance photomechanical jumping efficiency in soft materials.
- The developed dual-mode jumper offers versatile motion capabilities for advanced soft robotic applications.
- This approach provides a pathway for designing sophisticated light-driven actuators with tunable performance.
Related Concept Videos
01:16Eccentric Axial Loading in a Plane of Symmetry
285
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
285
01:18Unsymmetric Bending
431
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
431
01:05Static and Kinetic Frictional Force
16.1K
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...
16.1K
01:22Muscle Stimulation Frequency
2.6K
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
2.6K
01:13Maximum Deflection
627
When analyzing beams under unsymmetrical loads, such as a train moving on a bridge, it is crucial to accurately determine the points of maximum stress and deflection. The process involves identifying the maximum deflection of the beam, which may not always occur at its midpoint due to the uneven distribution of the load.
The maximum deflection occurs at a specific point, known as point O, where the tangent to the deflection curve is horizontal. To find point O, the slope of the tangent at any...
The maximum deflection occurs at a specific point, known as point O, where the tangent to the deflection curve is horizontal. To find point O, the slope of the tangent at any...
627
01:15Beams with Symmetric Loadings
241
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
The M/EI...
241