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| - Association, Partition, and Surface Activity in Biphasic SystemsDisplaying Relaxation Oscillations
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| - Several biphasic systems giving rise to periodical Marangoni instability have been analyzed from the point of viewof the physicochemical properties of the involved compounds. In each case, the compound at the origin of theoscillatory behavior has been identified: the reactant cetyltrimethylammonium bromide (CTAB) for the CTAB/picricacid (PH) system and the product of reaction dodecyl sulfate tetraalkylammonium (TAADS) for the sodium dodecylsulfate/tetraalkylammonium bromide (SDS/TAAB) system. The properties of the latter system have been variedprogressively by increasing the chain length of the tetraalkylammonium ion. Oscillations were observed whicheverthe direction of transfer (from water to dichloromethane and from dichloromethane to water). The comparison of thedynamic interfacial tension, recorded during transfer, to equilibrium measurements shows that the instability is favoredwhen partition is highly in favor of the organic phase. The main criteria for the appearance of the instability are ahigh surface activity and a low interfacial adsorption.
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