Some Possibilities of the Drop-Volume Method for Investigation of the Water/Oil Phase Interface: Adsorption and Precipitation
Keywords:dicyclohexane-18-crown-6, interface, interfacial tension, isotherm, precipitation.
The present paper presents evaluation of the thickness of adsorbed layer (linear dimension of a molecule), the number of monolayers precipitated from the organic and aqueous phases, the densities of crown-ether and its complexes with KSCN, KAg(CN)2. Special attention was paid to the course of interfacial tension isotherms when surface active substance (SAS) adsorbs from water or organic phase; state of substance in solution: dissociation, formation of saturated or supersaturated solution. The thickness of adsorbed layer of complexes between crown ethers and potassium salts equals to 5 – 7 Å and it is comparable to the thickness of a monolayer formed by lying hydrocarbon chains.
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