Related Experiment Video
Updated: Jun 9, 2025
08:17
Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
Published on: May 25, 2016
9.3K
Digital Light Process 3D Printing of Magnetically Aligned Liquid Crystalline Elastomer Free-forms
Jeremy A Herman1,2, Rodrigo Telles3, Caitlyn C Cook4
1Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, NM, 87106, USA.
Advanced Materials (Deerfield Beach, Fla.)
|October 29, 2024
Summary
Researchers developed aligned liquid crystalline elastomers (LCEs) using digital light process (DLP) 3D printing and magnetic fields. This method enables complex, stimuli-responsive soft materials for applications in robotics and energy absorption.
Area of Science:
- Materials Science
- Polymer Chemistry
- Soft Matter Physics
Background:
- Liquid crystalline elastomers (LCEs) are anisotropic soft materials exhibiting significant dimensional changes in response to stimuli.
- The thermomechanical response of LCEs is strongly dependent on the alignment of their molecular structure.
- Additive manufacturing (AM), particularly direct ink write printing, has been used for LCE fabrication, but challenges remain in achieving controlled alignment with other AM techniques like digital light process (DLP).
Purpose of the Study:
- To develop a method for preparing aligned main-chain LCEs using DLP 3D printing.
- To investigate the influence of magnetic field strength, alignment time, and layer thickness on the degree of molecular orientation in DLP-printed LCEs.
- To demonstrate the fabrication of complex LCE free-forms with controlled, spatially varying molecular orientations.
Main Methods:
- Utilized digital light process (DLP) 3D printing in conjunction with a 100 mT magnetic field to align liquid crystalline elastomers (LCEs) during fabrication.
- Systematically varied magnetic field strength, alignment duration, and build layer thickness to quantify their impact on LCE orientation.
- Developed complex LCE structures with through-thickness variations in molecular orientation.
Main Results:
- Achieved aligned main-chain LCEs through DLP 3D printing under a magnetic field.
- Quantified the effects of magnetic field parameters and printing conditions on the degree of molecular orientation.
- Successfully fabricated complex LCE free-forms exhibiting hierarchical variations in spatial orientation.
- Demonstrated that these complex LCE structures display mechanical instabilities upon heating.
Conclusions:
- DLP 3D printing, combined with magnetic field alignment, provides a viable method for creating oriented LCEs.
- Understanding the fundamental relationships between printing parameters and molecular alignment allows for precise control over LCE properties.
- This technique opens new avenues for designing stimuli-responsive soft materials with tailored form factors for advanced applications.
- Potential applications include soft robotics, tunable actuators, and energy absorption devices.
