Sol-Gel Coexisting Phase of Polymer Microgels Triggers Spontaneous Buckling

Keisuke Koyanagi, Kazue Kudo, Miho Yanagisawa

研究成果: Article査読

1 被引用数 (Scopus)


Mechanical buckling is a ubiquitous phenomenon of elastic bodies like core-shell microgels. Although conventional theory predicts that sufficiently high pressure is the primary factor inducing the buckling of core-shell microgels, they often buckle spontaneously without applying pressure. We explored such spontaneous buckling of microgels by introducing interfacial tension between the gel phase of the shell and sol phase of the core. Thus, we found that the core-shell microgels in a sol-gel coexisting phase with a certain shell thickness ratio exhibit spontaneous buckling. According to our theoretical analysis, spontaneous buckling occurs due to the balance between the gel elasticity E and interfacial tension γ when the characteristic length γ/E is comparable to the microgel size R. Moreover, we found that the ratio between γ/E and R determines the buckling condition of the shell thickness ratio. Our findings establish an important framework for applying spontaneous buckling to the shape control of elastic bodies.

出版ステータスAccepted/In press - 2019

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 表面および界面
  • 分光学
  • 電気化学


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