Hydraulic Performance Modifications of a Zeolite Membrane after an Alkaline Treatment: Contribution of Polar and Apolar Surface Tension Components

Table 3

Estimation of the surface tension of the treated and the nontreated Na-mordenite plates from the contact angles obtained with water, ethylene glycol, and glycerol.

	Before alkaline treatment		After alkaline treatment
	(mN m^−1)	(degree)	(mN m^−1)	(degree)
Water	—	18.6	—	9.5
Glycerol	—	33.1	—	23
Ethylene glycol	—	20.4	—	15.2
	72.3		77