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Updated: May 9, 2026

Free-form Light Actuators &#8212; Fabrication and Control of Actuation in Microscopic Scale
08:17

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Published on: May 25, 2016

A light-response bilayer actuator for light-controlled capsule system.

Taoli Deng1, Hao Luo2, Jin Jiaxing1

  • 1College of Chemistry and Chemical Engineering, Anshun University, Anshun, 561000, China.

BMC Chemistry
|May 7, 2026
PubMed
Summary
This summary is machine-generated.

A novel near-infrared light-responsive bilayer actuator made from PVA-CNT/PE-GO composite films offers precise motion control for medical microrobotics. This technology enables on-demand drug release from a capsule, advancing minimally invasive medicine.

Keywords:
Bilayer actuatorFlexible filmLight-responseOn-demand opening

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Microrobotics holds promise for minimally invasive medicine but faces challenges in control, safety, and cost.
  • Developing efficient and controllable actuators is crucial for advancing microrobotic applications.

Purpose of the Study:

  • To design and investigate a near-infrared (NIR) light-responsive bilayer actuator for microrobotic applications.
  • To explore the potential of this actuator in a light-controlled drug release capsule system.
  • To analyze the performance and optimize the design of the composite actuator films.

Main Methods:

  • Fabrication of double-layer polyvinyl alcohol (PVA)-carbon nanotube (CNT)/polyethylene (PE)-graphene oxide (GO) composite films.
  • Characterization of the bilayer actuator's response to NIR irradiation, including bending deformation and response time.
  • Analysis of the effects of CNT concentration gradients and PVA-CNT layer thickness on film performance.
  • COMSOL finite element simulations to develop a "light-thermal-mechanical" energy conversion model.
  • Design and demonstration of a light-controlled drug release capsule utilizing the actuator.

Main Results:

  • The PVA-CNT/PE-GO composite films exhibited large bending deformation and rapid response under NIR irradiation due to thermal expansion coefficient mismatch.
  • Optimized CNT concentration and film thickness improved stability and fatigue resistance.
  • The "light-thermal-mechanical" model accurately validated the photothermal actuation mechanism.
  • A functional light-controlled capsule demonstrated on-demand opening via photothermal actuation.

Conclusions:

  • The developed NIR light-responsive bilayer actuator shows excellent performance for microrobotic applications.
  • The light-controlled drug release capsule system provides a viable strategy for targeted and on-demand therapeutic delivery.
  • This work offers a promising design for future light-responsive actuators in biomedical exploration.