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Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles
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Hydrophilic/Hydrophobic Composite Shape-Shifting Structures.

Zeang Zhao1,2, Xiao Kuang1, Chao Yuan1

  • 1The George W. Woodruff School of Mechanical Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States.

ACS Applied Materials & Interfaces
|May 9, 2018
PubMed
Summary

This study introduces a novel composite structure for shape-shifting smart devices, overcoming limitations of hydrogels with faster, stronger actuation. The photopolymer system offers easier fabrication for applications like soft robotics.

Keywords:
3D printing4D printingactive structuresdigital light processingsolvent-responsive structures

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Area of Science:

  • Polymer Science
  • Materials Science
  • Smart Materials

Background:

  • Swelling-induced shape transformation is key for smart polymer devices like soft robotics and biomedical applications.
  • Existing hydrogel-based designs face challenges: low actuation force, slow response, and complex fabrication.
  • There is a need for advanced materials offering improved performance and simpler manufacturing.

Purpose of the Study:

  • To develop a novel hydrophilic/hydrophobic composite structure for enhanced shape-shifting capabilities.
  • To address the limitations of current soft hydrogel-based shape-shifting systems.
  • To explore the potential of photopolymers for creating advanced smart devices.

Main Methods:

  • Fabrication of a novel hydrophilic/hydrophobic composite structure using photopolymers.
  • Utilizing digital light processing (DLP) for precise patterning of the photocurable polymer system.
  • Conducting experimental investigations and theoretical analysis to understand the actuation process.
  • Creating and evaluating various 3D water-responsive shape-shifting structures, including those with sequential actuation.

Main Results:

  • The developed composite structure exhibits desirable actuation speed and force due to the rubbery nature of the constituent materials.
  • The digital light processing technique enabled facile patterning of the photocurable polymer system.
  • Successfully fabricated multiple 3D water-responsive shape-shifting structures with demonstrated sequential actuation.
  • Investigated the directional bending behavior of the hydrophilic/hydrophobic bilayer plate.

Conclusions:

  • The novel hydrophilic/hydrophobic composite structure offers a promising alternative to hydrogels for shape-shifting applications.
  • The photopolymer system combined with DLP presents an efficient and versatile method for fabricating complex smart devices.
  • The material's properties enable faster and stronger actuation, expanding possibilities for soft robotics and other smart technologies.