Bemerkung zur Dispersit�tsfrage gel�ster Zellulose

Zeise, H.

doi:10.1007/bf01497441

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“…The chloride curve follows the same form as that shown by potassium chloride, first negative and then positive apparent adsorption, while the sulfate is negatively adsorbed at all concentrations. In ammoniacal solutions, however, both salts show appreciable positive adsorption, supporting the conclusion of many investigators (e.g., 1, 13, 14, 20, 22,25) that chemical combination occurs between the cellulose and the copper ammonia complex. In the experiments the ratio Cu: NHS was kept constant (approximately 1:7), except in the very dilute solutions (0.02 M), where a much greater excess of ammonia was necessary in order to prevent hydrolysis.…”

Section: Resultssupporting

confidence: 83%

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

Heymann¹,

McKillop²

1941

J. Phys. Chem.

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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

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Section: Resultssupporting

confidence: 83%