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Topology-Dependent pH-Responsive Actuation and Shape Memory Programming for Biomimetic 4D Printing.

Houwen Matthew Pan1, Atsushi Goto1

  • 1School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.

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Summary

This study introduces 4D printing using flower-like block copolymer nanoassemblies for advanced biomimetic actuators. These novel materials exhibit topology-dependent actuation and shape memory, enabling complex movements for bionic applications.

Keywords:
3D printingblock copolymersreversible shape changesself-assemblystimuli-responsive behavior

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Area of Science:

  • Materials Science
  • Biomimetics
  • Robotics

Background:

  • Biomimetic actuators are crucial for bionics, biomedical devices, soft robotics, and biosensors.
  • 4D printing offers advanced capabilities for creating dynamic and responsive materials.

Purpose of the Study:

  • To investigate nanoassembly topology-dependent actuation and shape memory programming in biomimetic 4D printing.
  • To develop novel photocurable printing materials for digital light processing (DLP) 4D printing.

Main Methods:

  • Utilized multi-responsive flower-like block copolymer nanoassemblies (vesicles) as photocurable printing materials.
  • Employed digital light processing (DLP) 4D printing to fabricate biomimetic actuators.
  • Investigated topology-dependent bending in response to pH and temperature stimuli.

Main Results:

  • Flower-like nanoassemblies demonstrated enhanced thermal stability due to surface loop structures.
  • Actuators exhibited topology-dependent bending and pH/temperature-programmable shape memory properties.
  • Biomimetic octopus-like soft actuators achieved large bending angles (≈500°), high weight-to-lift ratios (≈60), and moderate response times (≈5 min).

Conclusions:

  • Successfully developed nanoassembly topology-dependent and shape-programmable intelligent materials for biomimetic 4D printing.
  • The novel materials hold significant potential for advanced applications in soft robotics and biomedical devices.