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Kizim, N. F.; Nesterova, O. P.; Malyukova, V. A.

doi:10.1023/a:1013743421251

Cited by 3 publications

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“…The replacement of water by an aqueous solution of rare earth element (Ln(III)) chloride in the water-D2EHPA-heptane system additionally complicates the physical picture (Fig. 2), because there is a chem ical reaction in the dynamic interfacial layer to form lanthanide di (2 ethylhexyl)phosphate, which is somewhat surface active, but is insoluble in either the aqueous or the organic phases, and accumulates in the interfacial layer [8][9][10].…”

Section: Resultsmentioning

confidence: 99%

State of the dynamic interfacial layer of an extraction system and the attenuation coefficient of surface waves

2013

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The possibility of using the method of surface waves for solving physicochemical problems was previously demonstrated by Noskov et al. [1], who, having stud ied the adsorption of surfactants at the aqueous solu tion-air interface, determined the kinetic characteris tics and sizes of micelles. We failed to find similar stud ies as applied to systems of two immiscible liquids, although Barik et al. [2] and Boev and Yasnitskaya [3] showed that the attenuation coefficient depends on the frequency, the surface tension, and the properties of the liquids, namely, viscosity and density. Such dependence suggests that this parameter can be used for identifying structural changes in the dynamic interfacial layer, which emerges in the case of the redistribution of chemically reactive components between phases of a heterogeneous liquid system [4].The purpose of this work was to prove the applica bility of the attenuation coefficient of surface waves generated at the liquid-liquid interface for detecting changes in the state of the dynamic interfacial layer.The novelty of this work consists in the fact that it for the first time presents data on the possibility of using the attenuation coefficient for determining changes in the state of the interface and the surface layers of a heterogeneous liquid system. EXPERIMENTALThe objects of investigation were the heteroge neous systems water-aqueous solution of erbium or praseodymium chloride (pH 5.3)-0.05 M di (2 eth ylhexyl)phosphoric acid (D2EHPA) solution in hep tane. All the reagents were chemically pure. D2EHPA was purified according to a published procedure [5].The experiment was performed on a setup that included a soundproof chamber in which a glass cell (Petri dish) with a system to be studied, a sensor, and a vibrator were placed.The sensor was a highly sensitive piezoceramic head with a 7 cm long rigidly attached glass thread 0.05 cm in diameter, the 0.5 cm long end portion of which was bent at a right angle. The sensor was con nected with a coaxial cable to a selective microvoltme ter, the output signal of which entered a storage oscil loscope and a frequency meter.The vibrator was a high frequency electrodynamic head with a 4.3 cm long stainless steel rod 0.05 cm in diameter, which was rigidly attached to the center of the diffuser. To the end of the rod, a vibrating element was fastened. The vibrating element was made of tet rafluoroethylene in the shape of a regular trigonal prism with a height of 0.5 cm and a base of 1.1 × 0.3 cm, one of the lateral edges of which faced the interface. The vibrator was connected to a low frequency signal generator. The measurements were made within the frequency range 2-14 kHz. Within this range, no eigenfrequencies of the sensor and the vibrator were detected.The experiment was performed as follows. Initially, the water-solvent heterogeneous system was studied. In a cylindrical glass cell 9.7 cm in diameter with a wall height of 1.5 cm, 20 mL distilled water was placed. The horizontal part of the glass thread at the beginning of the ...

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Section: Resultsmentioning

confidence: 99%