Surface tension solids

The relationship Young s equation describes is the interplay of forces (liquid surface tension, solid surface tension, liquid-solid surface tension) at the three-phase boundary line. It is regarded as if these forces interact along a line. Experimental data show that this is indeed true. The magnitude of 9 is thus only dependent on the molecules nearest the interface, and is independent of molecules much farther away from the contact line. 

The surface tensions of materials prepared with are some of the lowest attainable with the reagents commonly available, which is why many carpet and textile repellents are based on the chemistry of perfluoroalkyl chains. For example, a nylon-6,6 carpet would be wetted by oily soils, which, according to Eq. (4), would be difficult to remove. The presence of a FA coating on die fiber lowers its surface tension and repels the oil contaminant. In general, a liquid dial has a high surface tension will not wet a solid with low surface tension (e.g., water on PTFE). The converse is also true. A low-surface-tension liquid will wet a high surface tension solid (e.g., hexadecane on nylon-6,6). 

COATING FORMULATION Volatilit/. TochiriBss. Viscosity. Surface tension. Solids content. Mechanical properties. 

Figure 18.4. Calculated surface tension (solid line, left-hand y-axis) and refractive index (dashed line, right-hand y-axis) of polystyrene as functions of the temperature. 

Figure 5.10 Computed thickness for models without and with surface tension, solid and dashed lines, respectively, at t = 15 on the right and t = 231.9 on the left here 6 = 0.25. The case with surface tension is computed with kz(L,t) = 0 and neglecting all terms with d in equations (17) and (using C = 0 in Equation (19)) see [57] for details...

Fractional gas holdup is an indication of the effective interfacial area in any gas-liquid system. Detailed discussion on fractional gas holdup in stirred reactors is available in Section 7A.5. Analogous to other parameters, the gas holdup is also a function of the operating parameters (superficial gas velocity, type of impeller and its size/position in the reactor, etc.) and system properties (liquid-phase viscosity, surface tension, solid density and loading, presence of surfactant, etc.). As discussed in Section 7A.5, YawaUcar et al. (2002a) have been able to obtain a unique correlation for the gas holdup using the concept of relative dispersion N/N ... 

KOZ Kozlowska, M.K., Domanska, U., Dudeka, D., and Rogalski, M., Surface tension, (solid + liquid) equilibria and (liquid + liquid) equilibria for (iPBu-1 + hydrocaibon, or alcohol) systems. FluidPha.se Equil, 236, 184, 2005. 

Liquids Surface tension Solids Surface tension... 

Solid Dispersion value of solid surface tension Solid Dispersion value of solid surface tension... 

Measurements of solid surface tensions, solid-liquid interfacial tensions, and contact angles vary by typically 4mNm or 3°. The parameters depend to a certain degree on how the samples are prepared. For a discussion, see Refs [1177, 1178]. 

Figure 1. Surface tension (solid circles) vs. molecular weight to the -2/3 power for the n-alkanes. Theoretical lines were calculated from a linear regression analysis of values obtained from Equation (6). Experimental points taken from Reference (14).

Figure 3. Comparison, of calculated and experimental surface tensions (solid circles) for poly(dimethyl siloxane). The solid line is the present theory. Equation (6), with 1 = 0.55. The dotted line is Equation (10), the dot-dashed line is Equation (11), and the dashed line is Equation (12). Experimental values were taken from Reference 16.

Keywords Solid surface tension Solid surface energy Contact angle Work of adhesion Zisman method Surface tension component mefliod Fowkes method Owais-Wendt-Rabel-Kaelble mefliod Extended Fowkes mefliod Equation of state... 

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