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Programmable Etherified-Starch Networks Enable Tunable Humidity-Responsive Soft Actuators for Smart Textiles
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DOI：10.1002/admi.70554.png)
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Abstract
En 中文
Bio-inspired, humidity-responsive actuators hold great promises for flexible robotics, sensing, and intelligent energy systems. However, conventional fabrication methods often suffer from high cost, complex chemistry, and environmental concerns. Here, we report a sustainable molecular engineering strategy for starch-derived films based on sequential acidification and etherification, which precisely modulates the intermolecular hydrogen-bonding network to enhance flexibility, control moisture uptake, and enable reversible actuation. The optimized 0.1 mm-thick films exhibit rapid bending (180° in 22 s under 70% relative humidity) and exceptional durability, maintaining structural integrity and actuation performance over 700 cycles. Atomic force microscopy confirms a significant reduction in surface roughness (∼8.6-fold), minimizing stress concentrations and promoting uniform deformation. Importantly, these starch-based actuators combine biodegradability with high-performance actuation, demonstrating potential for next-generation intelligent applications, including biomimetic inchworm-like robots, reversible electronic switches, and self-regulating ventilation systems for hazardous vapor detection. This work provides a rational, molecular-level design strategy for sustainable, high-performance soft actuators.
Keywords:
bending
humidity-responsive actuator
intelligent devices
starch-derived film
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