Abstract
The wettability of particles has been characterized by floatability experiments with model systems of monosized spheres of various materials and surface coatings. Equilibrium floatability experiments have been employed, where each individual particle was tested for flotation on the interface of various aqueous ethanol or methanol solutions. Results are expressed in terms of the percentage of floating particles (out of 40 tested for each experiment) vs the concentration of the solution. The highest concentration of ethanol (methanol) at which all the particles float is termed the “total floating concentration” (TFC), and the lowest ethanol (methanol) concentration at which all the particles sink is called the “total sinking concentration” (TSC The reasons for the difference between the TFC and TSC are discussed, and the general trends followed by these values are compared with the theoretical condition for floatability equilibrium. The values of the surface tension of the various solid surfaces, as calculated from the present data, closely resemble values of critical surface tension for flat surfaces. The TFC and TSC are shown to be a sensitive measure of variations in the surface properties of the particles.
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