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Drying-induced cavitation in a constrained hydrogel.

Huiming Wang1, Shengqiang Cai

  • 1Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, People's Republic of China.

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Summary
This summary is machine-generated.

Drying a hydrogel can cause cavitation, a phenomenon similar to phase transitions. Cavity size changes abruptly with humidity, potentially leading to gel fracture due to large stretches.

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Area of Science:

  • Soft matter physics
  • Materials science
  • Polymer chemistry

Background:

  • Cavitation is common in soft materials like elastomers under mechanical load.
  • Previous research primarily focused on elastomers, not hydrogels undergoing drying.
  • Understanding cavitation in hydrogels is crucial for their application and stability.

Purpose of the Study:

  • To investigate the phenomenon of cavitation in constrained hydrogels induced by drying.
  • To analyze the role of surface tension and chemo-mechanics in hydrogel cavitation.
  • To determine the relationship between humidity and cavity formation in hydrogels.

Main Methods:

  • Calculation of the system's free energy as a function of cavity size.
  • Inclusion of surface tension and chemo-mechanics in the theoretical model.
  • Analysis of the free energy landscape to identify phase transition behavior.

Main Results:

  • The free energy landscape exhibits a double-well structure, indicative of a first-order phase transition.
  • Cavity size transitions from tiny to large abruptly at a critical humidity.
  • Significant local stretches are induced in the hydrogel during drying.

Conclusions:

  • Hydrogel drying induces cavitation through a process analogous to first-order phase transitions.
  • The critical humidity dictates a sudden and discontinuous change in cavity size.
  • Induced large stretches during drying pose a risk of hydrogel fracture.