期刊
SOFT MATTER
卷 18, 期 2, 页码 365-371出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sm01297e
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资金
- European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant [722497]
- Max Planck - University of Twente Center for Complex Fluid Dynamics
- Max Planck Graduate Center (MPGC)
- Max Planck Society
- [SPP 2171]
External shear flows of oil lead to linear dehydration and shrinkage of hydrogel due to finite solubility of water in oil continuously removing water from the hydrogel by diffusion. The flow advects the water-rich oil, as demonstrated by numerical solutions, and shear does not cause gel shrinkage for water-saturated oils or non-solvents. The solubility of water in the oil will tune the dehydration dynamics.
We investigate the shrinkage of a surface-grafted water-swollen hydrogel under shear flows of oils by laser scanning confocal microscopy. Interestingly, external shear flows of oil lead to linear dehydration and shrinkage of the hydrogel for all investigated flow conditions irrespective of the chemical nature of the hydrogel. The reason is that the finite solubility of water in oil removes water from the hydrogel continuously by diffusion. The flow advects the water-rich oil, as demonstrated by numerical solutions of the underlying convection-diffusion equation. In line with this hypothesis, shear does not cause gel shrinkage for water-saturated oils or non-solvents. The solubility of water in the oil will tune the dehydration dynamics.
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