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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Updated: Feb 14, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
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Hydroxypropyl cellulose-based photonic actuators coupling structural color and programmable deformation.

Ting Wang1, Yifeng Wang1, Chunyu Ji1

  • 1School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.

Carbohydrate Polymers
|February 12, 2026
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Summary

Researchers developed humidity-responsive photonic actuators using hydroxypropyl cellulose (HPC) and acrylamide. These sustainable materials exhibit tunable structural color and reversible deformation, enabling applications in robotics and sensing.

Keywords:
Dynamic structure colorHumidity-responsive actuatorsHydroxypropyl cellulose

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optics

Background:

  • Hydroxypropyl cellulose (HPC) forms cholesteric structures with tunable structural color.
  • Maintaining optical properties in solid-state HPC actuators is challenging.
  • Cellulose derivatives offer sustainable material platforms.

Purpose of the Study:

  • To create humidity-responsive photonic actuators with integrated structural color and deformation.
  • To anchor cholesteric structures within a stable polymer network.
  • To enable tunable mechanical and optical properties through controlled cross-linking.

Main Methods:

  • Co-assembly of methacrylate-functionalized HPC with acrylamide.
  • Formation of covalently double cross-linked networks.
  • Tuning film properties via controlled UV irradiation duration.
  • Fabrication of patterned films using photomasks.

Main Results:

  • Developed free-standing, humidity-responsive photonic actuators.
  • Achieved reversible structural color changes and deformation in response to humidity.
  • Demonstrated tunable mechanical modulus and moisture absorption.
  • Exhibited complex reversible deformations (bending, twisting, walking motion).

Conclusions:

  • Successfully integrated dynamic structural color and deformation in solid-state actuators.
  • HPC-based actuators offer tunable responses for advanced applications.
  • Promising for sustainable photonic robotics, biomimetic devices, and intelligent sensing.