The surface tension components of aqueous alcohol solutions

Surfactant-induced wetting transitions: Role of surface hydrophobicity and effect on oil permeability of ultrafiltration membranes

“…For our system, tentative estimates are given in Table 4. Surface tension components for water/alcohol mixtures have been reported by Janczuk et al [35]. Although 2-propanol has not been investigated, it can be seen from the data for ethanol and n-propanol that the dispersive component for these two substances is almost the same; namely 20 and 21 mN m -1 for a 30% solution of ethanol and n-propanol in water, respectively.…”

“…Interfacial tensions between two phases (712) can be determined from the geometric mean of the polar and the dispersive intermolecular interactions [34,35] …”

Wetting Study of Hydrophobic Membranes via Liquid Entry Pressure Measurements with Aqueous Alcohol Solutions

“…• C only (18). The alcohol concentration ranges from which γ d L can be supposed practically constant were estimated as follows: greater than 50% by weight for aqueous methanol solution, greater than 20% by weight for aqueous ethanol solution, and greater than 6% by weight for aqueous isopropanol solution.…”

Development of an accelerated low-pH reversed-phase liquid chromatography column stability test

“…Dewetting can be minimized or eliminated if the column can be maintained at sufficiently high pressures. The Young-Laplace equation [30] describes the relationship between the pressure required to force a non-wetting liquid into a capillary (or pore) of a given diameter size and the surface tension of the liquid and the contact angle at the liquid-solid interface. Since there is no organic component in the aging mobile phase to wet the stationary phase, pressure must be used to ensure that the phase does not dewet during the test.…”

“…Based upon the Young-Laplace equation [30] and conservative estimates of surface tension and contact angle, a minimum total backpressure of approximately 650 psi (4.5 MPa) is required to prevent dewetting of a phase with an average pore diameter of 100 Å. Experiments in our lab have shown that very little change in the retention-loss curves occurs for a wide variety of phases when a minimum additional, post-detector backpressure of 870 psi (6 MPa) is used.…”