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Related Concept Videos

Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...

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NIR-Mediated Deformation from a CNT-Based Bilayer Hydrogel.

Shijun Long1,2,3, Chang Liu1, Han Ren1

  • 1Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China.

Polymers
|April 27, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed advanced shape-shifting hydrogels using carbon nanotubes (CNTs) for enhanced mechanical strength and near-infrared light (NIR) responsiveness. These novel materials enable complex deformations, paving the way for sophisticated soft actuators and robots.

Keywords:
actuatorcarbon nanotubesparticle double-networkphotothermal conversiontemperature-responsive hydrogel

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Shape-shifting polymers are crucial for applications like soft robots and sensors, demanding both responsiveness and mechanical robustness.
  • Existing materials often struggle to balance multiple stimulus-response capabilities with high mechanical strength.

Purpose of the Study:

  • To design and fabricate a novel near-infrared-light (NIR)-responsive shape-shifting hydrogel system.
  • To enhance the mechanical properties and photo-responsiveness of hydrogels for advanced actuator applications.

Main Methods:

  • Embedding vinylsilane-modified carbon nanotubes (CNTs) into particle double-network (P-DN) hydrogels via micellar copolymerization.
  • Utilizing the brittle Poly(sodium 2-acrylamido-2-methylpropane-1-sulfonate) (PNaAMPS) network as sacrificial bonds for toughening.
  • Incorporating CNTs for NIR photothermal conversion ability.

Main Results:

  • The CNT-embedded P-DN hydrogels exhibited excellent mechanical strength, with a fracture strength of 312 kPa and a fracture strain of 357%.
  • An asymmetric bilayer hydrogel demonstrated 0°-110° bending deformation within 10 minutes under NIR irradiation.
  • Complex deformation movements were achieved, showcasing the material's potential for soft actuators.

Conclusions:

  • The developed hydrogel system offers a promising platform for creating robust, photoresponsive soft actuators.
  • This study provides a theoretical and experimental foundation for manufacturing advanced shape-shifting materials activated by NIR light.