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Qihan Liu1, Luochang Wang1

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A new dynamic osmocapillary model explains how immiscible liquids cause phase separation on swollen solids. This separation, affecting wetting properties, grows over time with a t^0.32 scaling, matching experimental data.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Fluid Dynamics

Background:

  • Swollen solids exhibit complex wetting behavior when exposed to immiscible liquids.
  • Surface tension at the contact line drives solvent extraction, inducing phase separation.
  • This phenomenon alters the solid's surface properties and is time-dependent.

Purpose of the Study:

  • To develop a dynamic osmocapillary model for predicting phase separation on swollen solids.
  • To investigate the time-dependent evolution of the phase separation zone.
  • To quantify the relationship between separation size and time.

Main Methods:

  • Development of a dynamic osmocapillary model.
  • Mathematical analysis of solvent transport and phase separation dynamics.
  • Comparison of model predictions with experimental observations.

Main Results:

  • The model predicts a time-dependent increase in the phase separation zone size.
  • A scaling relation of time to the power of 0.32 (t^0.32) was derived for the separation growth.
  • Model predictions show good agreement with existing experimental data.

Conclusions:

  • The dynamic osmocapillary model accurately captures the phase separation process on swollen solids.
  • The time-dependent scaling relation provides a quantitative understanding of separation growth.
  • This work offers insights into the wetting behavior of swollen materials in contact with immiscible liquids.