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Self-assembled micro-organogels for 3D printing silicone structures.

Christopher S O'Bryan1, Tapomoy Bhattacharjee1, Samuel Hart1

  • 1Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA.

Science Advances
|May 17, 2017
PubMed
Summary

Researchers developed novel micro-organogels for 3D printing silicone. These oil-swollen materials leverage the jamming transition for precise fabrication of complex structures like perfusable networks.

Keywords:
3D printingSelf-assemblySoft matter physicsbiomedical implantblock copolymermicrogelorganic microgelrapid prototypingsiliconesilicone elastomer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Microgels are valuable soft materials that exhibit a jamming transition, enabling tunable solid-like and fluid-like behaviors.
  • Traditional microgels primarily swell in aqueous or harsh organic solvents, limiting their application in nonpolar media.
  • This incompatibility restricts the use of microgels in oil-based 3D printing, such as with silicones.

Purpose of the Study:

  • To develop microgels compatible with nonpolar solvents, specifically mineral oil, for advanced material applications.
  • To utilize block copolymer self-assembly for creating novel micro-organogels.
  • To enable 3D printing of silicone structures using these new oil-swollen microgels.

Main Methods:

  • Synthesis of micro-organogels via block copolymer self-assembly.
  • Characterization of rheological properties, focusing on the jamming transition.
  • Application of the micro-organogel medium in 3D printing of silicone-based materials.

Main Results:

  • Successful creation of micro-organogels swollen in mineral oil.
  • Demonstration of tunable rheological properties through control of the jamming transition.
  • Achievement of precise 3D printing of complex silicone structures, including perfusable networks and fluid pumps.
  • Correlation between minimum printed feature size and the yield stress of the micro-organogel medium.

Conclusions:

  • The developed micro-organogels offer a versatile platform for 3D printing in nonpolar environments.
  • The jamming transition provides a mechanism for controlling print fidelity and enabling complex designs.
  • This work expands the utility of microgel technology for fabricating advanced silicone-based devices.