A New Interpretation of Contact Angle Variations in View of a Recent Analysis of Immersion Calorimetry

Contact Angle and Film Pressure: Study of a Talc Surface

“…This behavior seems general. We have obtained the same type of results for Teflon (13), and Bleier in a preceding paper also pointed out this behavior for a silicon wafer (46).…”

“…We have deduced from immersion and adsorption results the surface energy of the talc sample, using a semitheoretical model recently developed (12). These results can be used to predict contact angle on talc using a recent phenomenological equation linking the solid surface tension to the contact angle (13). Results obtained are also compared to classical analysis such as the Neumann's Equation of State (EOS) predictions (14).…”

A Simple Experimental Way of Measuring the Hamaker Constant A11 of Divided Solids by Immersion Calorimetry in Apolar Liquids

“…This is now possible by the recent development of the interpretation of immersion calorimetry (22)(23)(24)(25)(26).…”

“…From the basic equations for this last method and from recent progress (22)(23)(24)(25)(26) in measurement of solid surface energies by calorimetry, we propose in this work to establish a simple relationship between Hamaker constants A 11 of solids interacting in vacuum and the immersion enthalpy determined in a nonpolar liquid. We will compare values obtained using our method with those found in the literature.…”

Calorimetry at the Solid–Liquid Interface

“…Solid materials for which π m SG is small for any adsorbate are named the low-energy solids. For high-energy solids (e.g., mineral oxides, metal sulphides, inorganic salts), the decrease in surface tension due to adsorption is significant [30,37,38]. (6.17) This is a very useful relation, in which γ LG , cos , and π m SG can be measured and calculated quite easily and accurately.…”