Studies on the Lyotropic Series. III. The Adsorption of Salts on Cellulose.

Abstract

In two previous papers (6,16) the lyotropic action of electrolytes has been investigated and discussed in relation to the adsorption of salts on hydrophilic colloids, such as gelatin and methylcellulose. It was desirable to extend this investigation to cellulose also. This substance has considerable advantages from the experimental x'iewpoint over methylcellulose, which is insoluble only at elevated temperatures (15), and over gelatin, which is easily decomposed, yielding water-soluble products. Moreover, gelatin immobilizes a considerable amount of solution by swelling, and the possibility of a falsification of the experimental results as a consequence of a Donnan effect-although improbable (cf. 16)-cannot entirely be disregarded.i. the cellulose The cellulose was D.H.A. standard cotton wool, which is obtained from cotton by treatment with bleaching powder and subsequent treatment with hydrochloric acid and water. The commercial product still contains

Salt sorption on regenerated cellulosic fibers: electrokinetic measurements

“…, is attributed to the greater polarizing power of K ? ions, which stems from its smaller radius of hydration and weaker energy of hydration (Heymann and McKillop 1941;Braithwaite and Smith 1999). Ehrlich et al (Ehrlich et al 1989), suggest that the greater sorption of K ?…”

The Acid Nature of Cellulose. I. Equilibria between Cellulose and Salts.

“…Liberation of acid from .V/10 calcium acetate by cation-free cotton wool Fig. 5. Liberation of acid from .V/lOO calcium acetate solution containing free acetic acid (5 g. of cation-free cotton wool + 100 ml.…”

“…This interaction occurs only in alkaline solution, but in several investigations the point has arisen that in neutral solutions cellulose exhibits to a slight extent definite acidic properties. Our attention was drawn to this fact during an investigation by Heymann and McKillop (5) on the adsorption of salts on cellulose in relation to the lyotropic series. This adsorption is to some extent hydrolytic, the salt solution remaining acid.…”