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Directional wetting in anisotropic inverse opals.
Katherine R Phillips1, Nicolas Vogel, Ian B Burgess
1Department of Chemistry and Chemical Biology, ‡School of Engineering and Applied Sciences, and ∥Wyss Institute for Biologically Inspired Engineering, Harvard University , Cambridge, Massachusetts 02138, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 19, 2014
Summary
Liquid wetting in porous inverse opals is influenced by pore shape. Anisotropic structures show easier and directional infiltration compared to isotropic ones, confirmed by simulations and microscopy.
Area of Science:
- Materials Science
- Physics
- Fluid Dynamics
Background:
- Porous materials exhibit unique fluid transport phenomena due to confined fluid motion in nano- to microscale voids.
- Understanding liquid wetting in these structures is crucial for various applications.
Purpose of the Study:
- To investigate the effect of pore geometry anisotropy on liquid wetting in highly ordered inverse opals.
- To compare wetting patterns in structures with varying degrees of pore asphericity.
Main Methods:
- Fabrication and characterization of highly ordered inverse opals with controlled pore geometry.
- Experimental observation of liquid infiltration using time-resolved optical microscopy.
- Computational analysis using percolation simulations.
Main Results:
- Liquid wetting patterns differ based on pore shape, with anisotropic structures showing distinct behaviors.
- Highly anisotropic inverse opals are infiltrated more readily than isotropic counterparts.
- Wetting in anisotropic inverse opals is directional, favoring infiltration from the side.
Conclusions:
- Pore geometry anisotropy significantly impacts liquid wetting in inverse opals.
- Anisotropy facilitates easier and directional fluid infiltration.
- Findings provide insights into fluid transport in structured porous media.
