The spreading of small liquid drops over thin and thick porous layers (dry or saturated with
the same liquid) is discussed in the case of both complete wetting (silicone oils of different
viscosities over nitrocellulose membranes and blood over a filter paper) and partial wetting
(aqueous SDS (Sodium dodecyl sulfate) solutions of different concentrations and blood over
partially wetted substrates). Filter paper and nitrocellulose membranes of different porosity
and different average pore size were used as a model of thin porous layers, sponges, glass …

The spreading of small liquid drops over thin and thick porous layers (dry or saturated with
the same liquid) has been investigated in the case of both complete wetting (silicone oils of
different viscosities) and partial wetting (aqueous SDS solutions of different concentrations).
Consideration has been carried out from both experimental and theoretical points of view.
Nitrocellulose membranes of different porosity and averaged pore size were used as a
model of thin porous layers, glass and metal filters were used as a model of thick porous …