Physical-chemical mechanics of disperse systems and by Shchukin, Evgeniĭ Dmitrievich; Zelenev, Andrei S

By Shchukin, Evgeniĭ Dmitrievich; Zelenev, Andrei S

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While this is impossible for solid surfaces, such measurements are quite possible and indeed broadly utilized in the investigation of liquid films: emulsion films, foam films, and wetting films. In all of these cases, a flat and ­parallel state can be maintained because of the high mobility of the interfaces. The following approach, originally described by Derjaguin et al. [21], lays out the path to the experimental determination of the free energy of interaction between solid surfaces. 34 is evident a priori: the coefficient relating p(h) (mN = mJ/m) and Δσf(h) (mJ/m2) must have the dimension of length, and the only such parameter is the particle radius.

While confidence intervals for the 2x0 values indicate primarily the accuracy of measurements, the confidence intervals for the pSLS are characteristic of the true spread of the observed force values. 68 mm, the measured force values were typically on the order of ~2400 μN, but values as low as 1900 μN have also been observed. 19, the adhesive force between the solid surfaces in mercury should be equal to the sum of the adhesive force in air, pSS, and the capillary contraction force, Δp. For this reason, the spread in the values of pSS should be included in the spread of the pSLS values.

This linear tension can be either positive or negative and does not exceed 10 –4 dyn/cm. While the linear tension can in most cases be neglected, it plays an essential role in the case of very small droplets, particularly in nucleation. When a three-phase contact line is formed by a solid phase and two liquid phases, a selective wetting of the solid phase by one of the liquids takes place. , hydrocarbon or “oil”) in the wetting of the polar and nonpolar solid surfaces. By convention, in selective wetting, the contact angle, θ, is measured into the more polar phase.

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