Journal
MOLECULES
Volume 28, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/molecules28093952
Keywords
reactive red 2; ionic surfactant; nonionic surfactant; mixed micelles; binding coefficient; conductometry; spectroscopy
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This research investigates the solubilization of reactive red 2 (RR2) in single and mixed micellar systems using UV-visible spectroscopy and electrical conductivity measurements. It is found that RR2 interacts with cationic micelles. The solubilizing ability of mixed micellar systems is better than that of single micellar solutions.
Owing to their surface active properties, surfactants have numerous applications in different fields of life. In the present research work, the solubilization of reactive red 2 (RR2) has been studied in single and mixed micellar systems (MMS) using UV-visible spectroscopy and electrical conductivity measurements. The interaction of RR2 with ionic micelles of cetylpyridinium chloride (CPC) was investigated. In order to probe the interaction of RR2 in MMS, mixtures of CPC and TX-114 (Triton X-114, a nonionic surfactant) were used. UV-visible spectroscopy has been used to obtain the degree of solubilization of RR2 in terms of the partition coefficient (K-c) and Gibbs free energy of partitioning (Delta G degrees(p)). Electrical conductivity data have been employed to detect the critical micelle concentration (CMC) of the surfactant systems in the presence of RR2 and, accordingly, to calculate the thermodynamic parameters of the micellization. From the obtained data, it is concluded that the micellization is spontaneous at all studied temperatures. Moreover, the micellization was observed to be driven by both enthalpy and entropy. The results also indicated that MMS have better solubilizing power than single micellar solutions.
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