Comparison of the Use of Washburn's Equation in the Distance–Time and Weight–Time Imbibition Techniques

An experimental study about the imbibition of aqueous solutions of low concentration of a non-adsorbable surfactant in a hydrophilic porous medium

“…1. As shown exhaustively elsewhere [26][27][28][29][30], the graphical shape of these curves indicates that two simultaneous physical processes happening during the experiments are the responsible for the observed increase in the weight: the first of them, the imbibition in the interstices of the solid; the second one, the formation and the subsequent evolution of a liquid meniscus at the bottom of the glass columns. As the influence of the surfactant concentration on the imbibition is reflected only in the increase in the weight caused by the movement of the liquid inside the solid substrate, the weight contribution due to the meniscus has to be removed from the experimental results.…”

“…The increase in the weight of the porous columns caused by the imbibition was measured with the aid of an automatic measurement device previously described [26][27][28][29][30][31], similar to those used by other authors [4,14]. Basically, it was a digital balance (Mettler AE240) with the porous column hung in the below-the-balance weighing facility.…”

Influence of the interfacial adsorptions on the imbibition of aqueous solutions of low concentration of the non-ionic surfactant Triton X-100 into calcium fluoride porous medium

“…This tapping was performed continuously until the solid reached the same length in every glass column (35.3 ± 0.3 mm). The increase in the weight of the porous columns caused by the imbibition was measured with the aid of an automatic measurement device previously described [8][9][10][11][12][13], similar to those used by other authors [14][15][16][17]. The measurements were carried out at 20 ± 0.5 • C. The liquids were water, distilled and deionised from a Milli-Q system, and aqueous solutions of the non-ionic surfactant Triton X-100 (Fluka, purity 99.0%).…”

Use of novel polyetheralkanolamine comb polymers as pigment dispersants for aqueous coating systems

“…They attribute the contact angle changes during capillary rise and gravity could account for observed deviations from linearity. Labajos-Broncano et al 21 use parabolic forms of Washburn's equation to analyze the results of the capillarypenetration wetting technique instead of its linear expression. They define the total weight gained being the sum of the gained mass due to the imbibition expressed by equation (3) and the increased of weight caused by the force of the liquid surface tension exerts over the porous body due to the contact between solid and liquid.…”