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Improved Polydimethylsiloxane (PDMS) Double Casting via Silicone Oil Treatment for Densely Packed Microstructure Replication
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Embedded Core-Shell 3D Printing (eCS3DP) with Low-Viscosity Polysiloxanes.

Rahul Karyappa1,2, Wei Huang Goh2, Michinao Hashimoto2,3

  • 1Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore.

ACS Applied Materials & Interfaces
|September 1, 2022
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Summary
This summary is machine-generated.

This study introduces embedded core-shell 3D printing (eCS3DP) for creating flexible structures with internal channels. This method overcomes challenges with low-viscosity resins, enabling perfusable channels for soft sensors and robotics.

Keywords:
core−shell geometrydirect ink writing (DIW)interfacial instabilitypolysiloxanesyield stress

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Soft Robotics

Background:

  • Flexible 3D structures are crucial for soft sensors and actuators.
  • Fabricating 3D objects with internal architectures using liquid precursors is challenging due to structural instability, especially with low-viscosity resins.

Purpose of the Study:

  • To present a novel three-phase system for direct ink writing (DIW) 3D printing of flexible core-shell structures.
  • To overcome the limitations of fabricating 3D objects with internal channels using low-viscosity resins.

Main Methods:

  • Utilized direct ink writing (DIW) in a three-phase system.
  • Employed a core-shell printing approach with a low-viscosity polysiloxane resin (Ecoflex 10) as shell ink and Pluronic F127 in an ethanol gel as core ink.
  • Investigated the rheological properties of the three fluids to ensure filament stability.

Main Results:

  • Developed embedded core-shell 3D printing (eCS3DP) capable of fabricating stable core-shell filaments.
  • Achieved suppression of interfacial instability by using a high concentration of Pluronic F127 (30 w/w%) in the core liquid.
  • Successfully fabricated perfusable channels by removing the core liquid and demonstrated lateral attachment of printed filaments.
  • Observed the formation of core liquid droplets along printed filaments through controlled rheological properties and flow rates.

Conclusions:

  • eCS3DP provides a straightforward method for creating 3D soft elastomeric structures with embedded channels.
  • This technique is a valuable tool for DIW-based fabrication of flexible wearable devices and soft robotic components.