By Shchukin, Evgeniĭ Dmitrievich; Zelenev, Andrei S
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Extra info for Physical-chemical mechanics of disperse systems and materials
17). In this method, the weight of a droplet separating from a pipette tip with a radius r 0 is determined by direct weighing of 50–100 droplets, and the surface tension is estimated from the relationship mg = 2πr 0 σ. 16 Schematic illustration of Du Noüy ring detachment method. 17 Schematic illustration of drop weight method. © 2016 by Taylor & Francis Group, LLC 16 Physical-Chemical Mechanics of Disperse Systems and Materials surface tension, because a drop separating from a pipette tip has a rather complex geometry and the separating droplet is often accompanied by several smaller ones, the so-called satellite droplets.
Before we start addressing the experimental estimation of the interaction free energy in the contact, –Δσf(h 0) = F, it is worthwhile to compare the role that forces of various nature play in the contact interactions. Depending on the nature of the matter, the cohesive forces can be ionic, covalent, metallic, or molecular. Molecular forces can in turn be subdivided into orientation forces (between molecules containing rigid dipoles), induction forces (between a dipole and a polarizing molecule), and dispersion forces (between molecules that do not have permanent dipole moments, but that can polarize each other).
A very important application of nonwetting is the attachment of rock particles to air bubbles in flotation. 11 and will be discussed in more detail in Chapter 2. 10 The effect of surface roughness on wetting. 11 Nonwetting during the elementary act of flotation. © 2016 by Taylor & Francis Group, LLC H 12 Physical-Chemical Mechanics of Disperse Systems and Materials Finally, let us briefly address some of the principal methods that are used to measure surface tension (free surface energy) in liquids.