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<p>We report a shear-induced irreversible gelation in a colloidal dispersion composed of silica nanoparticles and an amphiphilic block copolymer. While the dispersion is stable at rest, sustained shear induces the formation of chain-like nanoparticle structures, resulting in irreversible gelation. Prolonged shear, however, promotes particle rearrangement, increasing the liquid-like property of the gel. Rheological analysis confirmed the formation of a stable hydrogel that persisted after shear cessation. This nonmonotonic rheological response contrasts with conventional shear thinning or reversible gelation behaviors and suggests a new strategy for designing shear-responsive colloidal systems.</p> Graphical abstract <p></p>

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Shear-induced irreversible gelation of silica nanoparticle dispersions containing amphiphilic block copolymer

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Sota Niwa,
  • Seito Katayama,
  • Jin Nakamura,
  • Chikara Ohtsuki,
  • Ayae Sugawara-Narutaki

摘要

We report a shear-induced irreversible gelation in a colloidal dispersion composed of silica nanoparticles and an amphiphilic block copolymer. While the dispersion is stable at rest, sustained shear induces the formation of chain-like nanoparticle structures, resulting in irreversible gelation. Prolonged shear, however, promotes particle rearrangement, increasing the liquid-like property of the gel. Rheological analysis confirmed the formation of a stable hydrogel that persisted after shear cessation. This nonmonotonic rheological response contrasts with conventional shear thinning or reversible gelation behaviors and suggests a new strategy for designing shear-responsive colloidal systems.

Graphical abstract