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The electrostatic force on aqueous droplets suspended in dielectric liquids has been determined experimentally. The non-uniform alternating electric field was produced by using a two-electrode system consisting of wire (cylindrical electrode) and a planar electrode. By closely matching densities of the drop and the suspending liquid (decane/carbon tetrachloride mixture), video camera recording of...
Dielectric properties - linear (refractive indices) and nonlinear optical responses - of urea crystal are quantitatively calculated using static ab initio quantum chemistry calculations at the self-consistent field (SCF) level of theory. The polarizabili-ties and first hyperpolarizabilities of the urea molecule are used to calculate macroscopic susceptibilities of the urea crystal. The calculated...
The rate of gel-growth for spherical ionotropic metal alginate gel droplets has been studied. Experimental observations have shown that the relaxation time of the metal alginate ionotropic gel complexes of the droplet shapes decreased in the order Hg > Cd > Sn > Pb-alginates, whereas the velocity of sinking under gravitational acceleration decreases in the same order. The factors which affect...
The apparent dissociation constant of tris (hydroxymethyl) aminomethane (Tris-buffer) was determined at (25.0 š 0.1)°C and / = 0.1 mol dm(-3) KNO3 by po-tentiometric pH titration in pure water and different hydroorganic solvent media. The organic solvents used were methanol, ethanol, N, N-dimethylformamide (DMF), acetone and dioxane. pKa(2) changes with an increase in the concentration of organic...
The random sequential adsorption (RSA) approach was used to analyse adsorption kinetics of charged spheres at charged surfaces precovered with smaller sized, likely charged particles. The algorithm of M. R. Oberholzer et al. [20] was exploited to simulate adsorption allowing electrostatic interaction in three dimensions, that is, particle-particle and particle-surface interactions during the approach...
The kinetics of oxidation of threonine by permanganate in alkaline medium at a constant ionic strength has been studied spectrophotometrically. The reaction between permanganate threonine in alkaline medium exhibits 1:2 stoichiometry (KMnC>4: threonine). The reaction shows first order dependence of rate on permanganate concentration and less than unit order dependence each in threonine and alkali...
Viscosity of nanosized colloid silica suspensions was determined as a function of their weight fraction reaching 50%. The experiments have been carried out at fixed pH =10 and controlled ionic strength. It was found that for low concentration range, viscosity of silica sols increased more rapidly than the Einstein theory predicts. This deviation was much larger than predicted theoretically by taking...
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