- Mendez, S. and Fenton, E. M. and Gallegos, G. R. and Petsev, D. N. and Sibbett, S. S. and Stone, H. A. and Zhang, Y. and Lopez, G. P., Imbibition in Porous Membranes of Complex Shape: Quasi-stationary Flow in Thin Rectangular Segments,
Langmuir, vol. 26 no. 2
pp. 1380--1385 [doi] .
(last updated on 2013/06/21)
The sustained liquid now of a typical lateral flow assay can be mimicked by two-dimensional shaped, thin porous membranes, specifically rectangular membranes appended to circular sectors. In designing these fan-shaped devices, we have been aided by analytical equations and finite-element simulations. We show both mathematically and experimentally how a continuous increase in unwetted pore volume causes a deviation from traditional imbibition, and leads to quasi-stationary flow in the rectangular element. These results are both theoretically and practically important because they indicate how medical diagnostic test strips may be fabricated without incorporating an absorbent pad.