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Shape Memory Polymers for Active Cell Culture
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Triple-Bioinspired Shape Memory Microcavities with Strong and Switchable Adhesion.

Yufen Li1, Xiaofeng Liu1, Ruijie Wang1

  • 1State Key Laboratory of Urban Water Resource & Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.

ACS Nano
|November 20, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel smart adhesive inspired by nature. This adhesive uses a shape memory polymer to control adhesion to solids and liquids, enabling programmable transport and high adhesion strength.

Keywords:
Bioinspired adhesionProgrammable transport of solids and liquidsShape memory polymerSmart adhesiveSwitchable adhesion

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Area of Science:

  • Materials Science
  • Bio-inspired Engineering
  • Surface Science

Background:

  • Smart adhesives with switchable adhesion are crucial for advanced applications like robotics and sensors.
  • Existing surfaces with controllable adhesion to both solids and liquids often lack sufficient adhesion strength for robust solid gripping.
  • There is a need for adhesives that offer tunable adhesion to diverse surfaces and liquids.

Purpose of the Study:

  • To develop a novel smart adhesive with switchable adhesion to solids and liquids.
  • To overcome the limitation of insufficient adhesion strength in existing switchable adhesives.
  • To explore the potential of bio-inspired designs for advanced adhesive functionalities.

Main Methods:

  • Designed a triple-bioinspired adhesive incorporating microcavities made from a shape memory polymer (SMP).
  • Utilized the shape memory effect and rubber-glass (R-G) phase transition of the SMP for adhesion control.
  • Investigated adhesion switching to smooth solids, rough solids, and water droplets by adjusting temperature and applied force.

Main Results:

  • The developed adhesive demonstrated switchable adhesion to solids and liquids.
  • Achieved high adhesion strength on solids (up to 420 kPa) through shape interlocking and negative pressure effects.
  • Showcased programmable transport of both solids and liquids using the switchable adhesion.

Conclusions:

  • The novel bio-inspired shape memory smart adhesive effectively overcomes limitations of existing switchable adhesives.
  • The designed adhesive offers high adhesion strength and controllable adhesion to diverse surfaces and liquids.
  • This technology presents significant potential for applications in robotics, sensors, and programmable material transport.