UV curing-assisted 3D plotting of ceramic feedstock containing thermo-regulated phase-separable, photocurable vehicle for dual-scale porosity structure

Woo Lim Choi, Jong Won Jeon, Gyu Bin Choe, Gyu Nam Kim, Young Hag Koh, Hyoun Ee Kim

Research output: Contribution to journalArticlepeer-review

Abstract

We propose a novel approach for manufacturing dual-scale porosity alumina structures by UV curing-assisted 3D plotting of a specially formulated alumina feedstock using a thermo-regulated phase separable, photocurable camphene/triethylene glycol dimethacrylate (TEGDMA) vehicle. In particular, 3D plotting process was conducted at - 5 °C, and thus an alumina suspension prepared using liquid camphene/TEGDMA at room temperature could undergo phase separation, resulting in camphene crystals surrounded by walls comprised of liquid photopolymer enclosing alumina particles. To enhance the shape retention ability of extruded filaments, polystyrene (PS) polymer was used as the tackifier. The phase-separated feedrod could be extruded favorably through a nozzle and rapidly photopolymerized by UV light during the 3D plotting process. Three-dimensionally interconnected macropores were tightly constructed, which were separated by microporous alumina filaments, where micropores were created by the removal of camphene crystals via freeze-dying. The macroporosity of porous alumina ceramics was controlled by adjusting the distance between deposited filaments, while their microporosity was kept constant, leading to tightly tailored overall porosity and mechanical properties.

Original languageEnglish
Pages (from-to)24383-24392
Number of pages10
JournalCeramics International
Volume48
Issue number17
DOIs
Publication statusPublished - 2022 Sep 1

Keywords

  • Camphene
  • Dual-scale porosity
  • Phase separation
  • UV curing-assisted 3D plotting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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