Capillary Filling of Anodized Alumina Nanopore Arrays
K. J. Alvine, O. G. Shpyrko, P. S. Pershan, K. Shin, T. P. Russell
TL;DR
This study investigates the capillary filling behavior of a specific solvent in nanoporous alumina membranes using in situ x-ray scattering, revealing hysteresis and comparing results with theoretical models.
Contribution
It provides new experimental insights into nanopore filling dynamics and validates theoretical models against observed hysteresis phenomena.
Findings
Hysteretic capillary filling transition observed
Filling behavior aligns with modified Kelvin-Cohan theory
Reversible adsorption controlled by thermal offset
Abstract
The filling behavior of a room temperature solvent, perfluoromethylcyclohexane, in approximately 20 nm nanoporous alumina membranes was investigated in situ with small angle x-ray scattering. Adsorption in the pores was controlled reversibly by varying the chemical potential between the sample and a liquid reservoir via a thermal offset, T. The system exhibited a pronounced hysteretic capillary filling transition as liquid was condensed into the nanopores. These results are compared with Kelvin-Cohan theory, with a modified Derjaguin approximation, as well as with predictions by Cole and Saam.
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