The nature of the interfacial layer between an aqueous and a non-aqueous phase

Usher, F. L. (1925) The nature of the interfacial layer between an aqueous and a non-aqueous phase. Transactions of the Faraday Society, 21. pp. 406-424. ISSN 00147672

Full text not available from this repository. (Request a copy)
Official URL:


(1) Measurements of the number of ions which attach themselves to the spherical particles of a uniform stable suspension of gamboge during the process of neutralising their electric charge, lead to the conclusion that the majority of the neutralising (flocculating) ions are employed in displacing ions originally attached to the particles but not contributing to their effective charge. The total charge on the flocculating ions is therefore greatly in excess of the effective charge considered responsible for the stability and the electrokinetic behaviour of the particles. (2) The dilution of suspensions is shown to result in an increase in the number of ions attached by each particle in the course of flocculation, indicating that the net charge on the particles increases with their mean distance apart. (3) Parallel determinations of the flocculating power of different electrolytes and of their effect in reducing the concentration of the ions stabilising a suspension show that, among ions of the same valency, the flocculating power is determined by the solubility product of the compound formed from the flocculating and stabilising ions. (4) A theory involving the slight dissociation of a layer of surface molecules is considered preferable to other current theories in accounting for the results of experiments on mobility taken in conjunction with those on flocculation, and for the effect of dilution in increasing the stability of aqueous suspensions.

Item Type: Article
Subjects: C Chemical Science > Chemistry
Divisions: Department of > Chemistry
Depositing User: Dhruva Kumar
Date Deposited: 29 Apr 2021 15:06
Last Modified: 29 Apr 2021 15:06

Actions (login required)

View Item View Item