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Study on the Aggregation of Methylene Blue in Aqueous Solution of Surfactant by Absorption Spectroscopy

Zhou Danhong, Feng Zhuofu, Zhang Wenwei, Yang Mei (Department of Chemistry, Liaoning Normal University, Dalian ll6029 )  
The dimerization of metylene blue in aqueous solution of surfactant has been stud- ied by UV-Vis absorption spectroscopy. As the concentration of anionic surfactant is lower than its critical micelle concentration, the proportion of MB dimer has a maximum. From the ~ cyclohexane extract of MB, the absorbance maximum of MB dimer is found at 604 nm. The mechanism of dimerization of MB has been discussed.
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