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

Abstract

Two different experimental approaches based on ellipsometry and zeta potential measurements have been employed to determine the dispersion and polar surface free energy components of glass. From ellipsometry the adsorption isotherms of n-octane and water have been determined, yielding values for the film pressures of n-octane and water and the dispersion and polar surface free energy components of glass. Similarly, zeta potentials in water of glass covered with various amounts of n-octane and nhexanol have been determined. Next, the film pressures of these liquids and surface free energy components of glass were also calculated. Thus determined values are 32 and 80 m J / m 2 (from ellipsometry) and 25 and 80 m J / m z (from zeta potentials) for the dispersion and polar components, respectively. The correspondence between the surface free energies obtained by two completely independent methods gives confidence to the approaches employed.

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

“…Zeta potential determinations were done by microelectrophoresis [19,20]. A glass rectangular cell 100mmx20mmxlmm was used.…”

“…Also, taking into account Lippmann's equation for a polarizable inter-5222 face combined with Young-Dupre's equation, as done by Holly [21] for a non-conducting solid/liquid interface which relates the electrical surface charge and potential with interfacial free energies and the contact angle, it seemed to us reasonable to consider the observed changes in zeta potential as due to changes in the interfacial solid/liquid free energy resulting from increasing specific volume of the n-alkane or n-alcohol film [19].…”

“…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.…”

The Thermodynamic Characterization of Wetting by Submitting a Sessile Drop to Microgravity

“…Of the four parameters of Young [26] were given by Fox and Zisman [27], Owens and Wendt [28], Janczuk and Bialopiotrowicz [29], Wu [30], van Oss, Chaudhury and Good [31], Li and Neumann [25], Kwok et al [32], Shimizu and Demarquette [33] and Chibowski et al [34]. Except for the Li-Neumann method, all the mentioned solutions use a pair or more liquids to calculate the surface energy of the solid and the interface solid-liquid.…”

The Thermodynamic Characterization of Wetting by Submitting a Sessile Drop to Microgravity

“…Combining This equation was the start point for several attempts to obtain mathematical expressions or numerical procedures able to provide the values of γS and γSL when only the values of γL and θY are known. The most relevant solutions [26] were given by Fox and Zisman [27], Owens and Wendt [28], Janczuk and Bialopiotrowicz [29], Wu [30], van Oss, Chaudhury and Good [31], Li and Neumann [25], Kwok et al [32], Shimizu and Demarquette [33] and Chibowski et al [34]. Except for the LiNeumann method, all the mentioned solutions use a pair or more liquids to calculate the surface energy of the solid and the interface solid-liquid.…”