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<p>This study investigates the impact of aging on the rheological properties of SiO₂-based inks for DIW (Direct Ink Writing) and their subsequent printability in additive manufacturing. The inks, composed of a poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) matrix, polyethylene glycol plasticizer, and silicon oxide (SiO₂), were characterized over a period of 21&#xa0;days to evaluate changes in viscosity and viscoelastic moduli (G′ and G″). The results revealed that aging significantly improves the structural strength of the ink, from liquid-like to more solid-like behavior, as evidenced by increased viscosity at low shear rates and in the complex modulus (G*). Optimal printability conditions and extrusion rates were identified for each aging period, demonstrating that prolonged aging improves scaffold stability and structural fidelity. These results provide essential information for tailoring ceramic inks for reliable DIW, emphasizing the interplay between aging time, rheological evolution, and manufacturing parameters.</p>

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Temporal rheological evolution of SiO₂-based inks and its impact on scaffolds’ fidelity for direct ink writing

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Karen Y. Pérez-Salas,
  • Rocío Redón,
  • Leopoldo Ruiz-Huerta,
  • Gabriel Ascanio,
  • Juan P. Aguayo,
  • Lucy-Caterine Daza-Gómez

摘要

This study investigates the impact of aging on the rheological properties of SiO₂-based inks for DIW (Direct Ink Writing) and their subsequent printability in additive manufacturing. The inks, composed of a poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) matrix, polyethylene glycol plasticizer, and silicon oxide (SiO₂), were characterized over a period of 21 days to evaluate changes in viscosity and viscoelastic moduli (G′ and G″). The results revealed that aging significantly improves the structural strength of the ink, from liquid-like to more solid-like behavior, as evidenced by increased viscosity at low shear rates and in the complex modulus (G*). Optimal printability conditions and extrusion rates were identified for each aging period, demonstrating that prolonged aging improves scaffold stability and structural fidelity. These results provide essential information for tailoring ceramic inks for reliable DIW, emphasizing the interplay between aging time, rheological evolution, and manufacturing parameters.