5-pentol (xylitol), and 2-(hydroxymethyl)-6- [4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxane-3,4, 5-triol (maltitol) aqueous solutions of various mole concentrations have been determined at T ) (293.15, 303.15, 313.15, and 323.15) K. The experimental data for the viscosities of sugar alcohol aqueous solutions present a nonlinear relation to the temperature or concentration. The exponential model was used to correlate the experimental data for viscosities, with the maximum average deviation of 3.7 %. The experimental data for the densities of sugar alcohol aqueous solutions show a linear relation to the temperature or concentration considerably well. The linear equation was used to correlate the data for densities, and the maximum average deviation between the experimental data and the calculated values is 0.056 %.
The contact angles of the aqueous solution of ethanol and that of n-propanol on copper, aluminum, and stainless steel surfaces are reported. The contact angles were measured under atmospheric conditions, and then under vapor-liquid equilibrium conditions at 1 atm and different temperatures. The results showed the variations of the contact angles with the concentrations of aqueous solutions on different metal material surfaces with different roughness. Some unstable behavior of the wetting ability around the azeotropic point of a binary solution is reported. Influences of concentration, kind of materials, and the surface roughness on the wetting ability are discussed. The model for predicting the contact angle of alcohol aqueous solutions on metal surfaces under atmospheric and vaporliquid two-phase equilibrium conditions at 1 atm is derived from the Young equation.
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