Wetting characteristics of liquid membrane solution on bead material
This protocol is extracted from research article:
Free-standing liquid membranes as unusual particle separators
Sci Adv, Aug 24, 2018; DOI: 10.1126/sciadv.aat3276

Contact angle measurements of liquid membrane films on flat surfaces composed of materials chemistry similar or identical to that of the beads used in our experiments were used to approximate the energy loss due to pinning (section S2 and figs. S1 and S2). To approximate the energy dissipation associated with pinning, both advancing and receding contact angle values were required. Because the surface roughnesses of our flat surface samples are smaller than those of the beads (table S3), this would lead to an underestimate of the energy dissipation due to liquid pinning. To calculate an upper estimate of the pinning energy for an order of magnitude comparison, we assumed the receding angles to be zero in all cases (that is, θR = 0°). The experimentally measured advancing angles are shown in table S4.

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