Light beam measurement of absorption by substrates

Abstract

Spontaneous absorption of liquids by porous substrates and capillaries is measured by an optical electronic measuring system providing millisecond resolution of millimeter size droplets. A syringe forms a drop over a porous material or capillary. The absorption time is measured from the instant the lower extreme of the drop formed contacts the porous material or capillary until there is no curvature remaining above the porous material or capillary surface at the location of the drop first contact. The time measurement is also a measurement of the absorption velocity. The absorption velocity characterizes the absorption ability of tested substrates with respect to the testing liquid. The apparatus can be used in microfabrication applications for quantitative analysis of the wettability, permeability, and sorption capacity of structured substrates, including various porous/fibrous materials, chips for microfluidic devices, nano and microelectromechanical systems and chips for protein recognition.

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