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Volumes,heat capacities and solubilities of amyl compounds in decyltrimethylammonium bromide aqueous solutions
Authors:R. De Lisi  S. Milioto  R. Triolo
Affiliation:(1) Dipartimento di Chimica Fisica, Universitá di Palermo, via Archirafi 26, 90123 Palermo, Italy
Abstract:Apparent molar heat capacities and volumes of amylamine (PentNH2) 0.02m, capronitrile (PentCN) 0.02m and nitropentane (PentNO2) 0.009m in decyltrimethylammonium bromide (DeTAB) micellar solutions, in water and in octane were measured at 25°C. By assuming that their concentration approaches the standard infinite dilution state, heat capacities and volumes were rationalized by means of previously reported equations following which the distribution constant between the aqueous and the micellar phase and heat capacity and volume of the additives in both phases are simultaneously derived. The present results are compared to those we have previously obtained for pentanol (PentOH). The thermodynamic properties of PentNH2 in water and in micellar phase are substantially identical to those of PentOH but different from those of PentCN and PentNO2 whereas the opposite behavior was observed in their pure liquid state and in octane. The nature of the solvent medium seems to affect the thermodynamic behavior of PentNH2. Also, the study of the apparent molar heat capacities of the amyl compounds investigated here in micellar solutions as a function of surfactant concentration shows evidence of a maximum at about 0.4m DeTAB, which can be attributed to a micellar structural transition. Accordingly, the solubilities of PentCN and PentNO2 as a function of the DeTAB concentration drop in the neighborhood of the concentration where heat capacities display the maximum.
Keywords:Nitropentane  capronitrile  amylamine  decyltrimethylammonium bromide  apparent molar heat capacities  apparent molar volumes  additive-micelle binding constants  heat capacities of amyl compounds in micellar phase  partial molar volumes of amyl compounds in micellar phase  solubilities of amyl compounds in micellar solutions  post-micellar transitions
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