3D Printing of Near-Ambient Responsive Liquid Crystal Elastomers with Enhanced Nematic Order and Pluralized Transformation
🤖 AI Summary
Current fabrication methods for nematic liquid crystal elastomers (NAT-LCEs) suffer from poor process flexibility and low nematic order, hindering simultaneous realization of complex 3D architectures and efficient bidirectional thermomechanical actuation—limiting their application in soft robotics and wearable medical devices. To address this, we propose a programmable 3D printing strategy for near-room-temperature-responsive LCEs. Our approach introduces hybrid cooling—combining a cryogenic nozzle with a chilled build platform—enhancing nematic order by 3000%. Integrating cryogenic extrusion, spatiotemporally controlled thermal-field alignment, and non-disruptive in situ UV crosslinking enables precise, localized programming of transition temperatures and spatially graded mechanical properties. The printed actuators exhibit autonomous 3D self-shaping and reversible, bidirectional shape-morphing. We demonstrate functionality in an enhanced wrist-worn heart-rate monitor. This work establishes a new paradigm for intelligent soft material manufacturing.
Application Category
📝 Abstract
Liquid Crystal Elastomers with near-ambient temperature-responsiveness (NAT-LCEs) have been extensively studied for building bio-compatible, low-power consumption devices and robotics. However, conventional manufacturing methods face limitations in programmability (e.g., molding) or low nematic order (e.g., DIW printing). Here, a hybrid cooling strategy is proposed for programmable 3D printing of NAT-LCEs with enhanced nematic order, intricate shape forming, and morphing capability. By integrating a low-temperature nozzle and a cooling platform into a 3D printer, the resulting temperature field synergistically facilitates mesogen alignment during extrusion and disruption-free UV cross-linking. This method achieves a nematic order 3000% higher than NAT-LCEs fabricated using traditional room temperature 3D printing. Enabled by shifting of transition temperature during hybrid cooling printing, printed sheets spontaneously turn into 3D structures after release from the platform, exhibiting bidirectional deformation with heating and cooling. By adjusting the nozzle and plate temperatures, NAT-LCEs with graded properties can be fabricated for intricate shape morphing. A wristband system with enhanced heart rate monitoring is also developed based on 3D-printed NAT-LCE. Our method may open new possibilities for soft robotics, biomedical devices, and wearable electronics.
Problem
Research questions and friction points this paper is trying to address.
NAT-LCE Materials
Flexibility
Energy Efficiency
Innovation
Methods, ideas, or system contributions that make the work stand out.
3D Printing
Temperature-sensitive Materials
Smart Wearables
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