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Direct Ink Writing of Rigid Microparticles.

Pauline Pradal1, Jong Bin Kim2, Seong Kyeong Nam3

  • 1Soft Materials Laboratory - Institute of Materials in École Polytechnique Fédérale de Lausanne, Lausanne, 1015, Switzerland.

Small (Weinheim an Der Bergstrasse, Germany)
|November 21, 2024
PubMed
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Researchers developed novel inks for direct ink writing (DIW) 3D printing using rigid microparticles with soft shells. This breakthrough enables printing of complex structures from previously unprintable stiff materials.

Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Rheology

Background:

  • Direct ink writing (DIW) is a 3D printing technique for creating macroscopic objects with controlled structures.
  • DIW is limited to materials with specific rheological properties, excluding many stiff substances.
  • Soft materials can be DIW-printed if formulated as jammed microparticles.

Purpose of the Study:

  • To overcome the rheological limitations of DIW for rigid microparticles.
  • To develop a novel ink formulation for 3D printing stiff materials.
  • To demonstrate the capability of printing intricate 3D structures using these new inks.

Main Methods:

  • Production of rigid microparticles with soft hydrogel shells.
  • Formulation of inks with up to 60 vol% rigid microparticles (stiffness up to 50 MPa).
Keywords:
3D printingcolloidal self‐assemblymechanicsmicrofluidicsrheologystiff microparticlesstructural colors

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  • Post-printing transformation of the granular structure via secondary network formation.

    • Main Results:

    • Successfully formulated inks with high concentrations of rigid microparticles suitable for DIW.
    • 3D printed complex structures, including a trophy cup.
    • Created flexible macroscopic photonic films from the developed material.

    Conclusions:

    • Rigid microparticles with soft shells enable DIW of stiff materials.
    • The developed inks expand the range of materials printable by DIW.
    • This approach allows for the creation of advanced 3D printed objects and functional films.