A relationship between the zeta potential and surface free energy changes of the sulfur/n-heptane—water system

Ice/Water Interface: Zeta Potential, Point of Zero Charge, and Hydrophobicity

“…For instance, it was found that after methylation diamond exhibits more negative zeta potential values (20). Chibowski and Waksmundzki (21,22) also found that the negative zeta potential of sulfur and Teflon in water increased with a progressively increasing precoverage of the surface with n-heptane or nhexane, respectively. For bare sulfur, the zeta potential was Ϫ25 mV, while for the surface precovered with three statistical monolayers of heptane, it increased to Ϫ80 mV; and for a layer as thick as 14 monolayers deposited on the surface, it reached Ϫ110 mV.…”

Influence of tetradecylamine chloride on the surface free-energy components and flotability of barite

“…The method consists in measurements of zeta potential in doubly distilled water for a series of the mineral samples precovered with known volumes of n-alkane for 7~ w determination [12,14,15], and then another series of samples of the same minerals precovered with known volumes of n-alcohol for determination of polar interaction of type 7 + (previously interpreted as non-dispersion component [19]). Having determined 7~ w and + 7s , 7[ was determined from contact-angle measurements of water and glycerol drops.…”

“…In this paper we have chosen barite/tetradecylamine chloride water as a model system to test whether a correlation exists between the predictions based on the experimental values of the mineral surface freeenergy components and flotation activity changes. The components were determined by contact-angle measurements as well as a method based on zetapotential measurements [12][13][14][15][16][17][18][19][20].…”

Surface free energy components of glass from ellipsometry and zeta potential measurements

“…n-Hexanol and n-octane adsorption isotherms were also determined on grains of glass by a more indirect technique based on zeta potentials (16)(17)(18)(19). Briefly, the glass grains were heated to 480°C for 5 h and 0.15-g aliquots were put in glass ampoules, which were subsequently cooled in liquid nitrogen.…”

“…Generally, data to solve these type of problems are generated from contact angle measurements (10-13), adsorption isotherms ( 5,14,15 ), zeta potentials as measured in specially chosen systems (16)(17)(18)(19), and also ellipsometry (20,21 ). The determination of solid surface free energies higher than those of water such as encountered for ionic crystals or glass (22) is especially a matter of much dispute, as it involves spreading pressure values, which cannot be neglected, as is usually done for low surface free energy materials (23,24).…”