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Solvent adsorption water effects

Lakes are prepared by adsorption or precipitation of a soluble dye on an insoluble substrate (e.g., alumina). They are useful in fatty products that have insufficient moisture to dissolve dyes (coated tablets, cake mixes, hard candies, chewing gum). Lakes are insoluble in most solvents including water, have high opacity, are easily incorporated in dry media, and show higher stability to light and heat. They are effective colorants for candies, pills, fats, and oils. The main characteristics and differences between lakes and dyes are well documented. ... [Pg.584]

The same authors have found that the inhibition effect of crown ethers [230] and crown esters [229] on cadmium electrodeposition from water-AN mixtures was caused by the competitive adsorption of macrocycles and organic solvents molecules. The effect of structure and concentration of crown ethers on the cadmium electrodeposition from aqueous sulfate solutions was also studied [231]. [Pg.783]

Although provides a useful reference scale for predicting the effect of water on enzyme activity, the adsorption (or retention) of water in the solid and fluid phases strongly varies with a. The adsorption/retention data is usually plotted in terms of water adsorbed by the solid phase vs. water retained in the solvent, or water adsorbed (retained) vs. a. Typically, the solvent water content increases linearly with for lipophilic solvents, sharply at high (approximately 0.6) for slightly polar solvents, - and sharply at low for very polar solvents. In addition, water adsorption is strongly influenced by the types and concentration of substrates. Profiles similar to those just described for slightly polar solvents exist for solid-phase (lyophilized or immobilized) enzymes. Typically, water... [Pg.199]

HON Hong, S.-J., Huang, H.-T., and Hong, T.-D., Effects of solvent adsorption on solution properties of poly(virtyl alcohol)/dimethylsirlfoxide/water ternary systems, J. Appl. Polym. Sci., 92, 3211,2004. [Pg.700]

An increase in IPA concentration in solution tends to lead to an increase in the adsorbed quantity in the sandpack, but this is probably a solvent effect since alcohol is a poorer solvent than water. The combined effect of alkali and surfactant is thought to be much more complex, since these can change the wettability of the rock—especially if it is partly oil-wet. In water-wet systems, decreases in HPAM adsorption were observed when various sulphonates contacted the rock. In similar experiments in oil-wet systems, increases in polymer adsorption were reported, probably because of changes in wettability. [Pg.154]


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See also in sourсe #XX -- [ Pg.34 , Pg.340 , Pg.340 ]




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Solvent adsorption

Solvent, water

Water adsorption

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