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Surface tension study of the interaction between two nonionic surfactants and two direct dyes
Author(s) -
PegiadouKoemtzopoulou Sofia,
Eleftheriadis Ioannis,
Kehayoglou Aristidis
Publication year - 1998
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-998-0008-4
Subject(s) - chemistry , surface tension , critical micelle concentration , chromophore , absorbance , pulmonary surfactant , aqueous solution , ether , micelle , nonionic surfactant , organic chemistry , chromatography , thermodynamics , biochemistry , physics
The complex‐forming interaction between two direct dyes, CI Yellow 106 and CI Blue 78, and two nonionic surfactants, namely, polyoxyethylene nonyl phenyl ether (NP‐12) and polyoxyethylene stearylamine (R‐11), in aqueous solutions was studied. The estimation was made by measuring surface tension and critical micelle concentration (CMC) changes as a function of dye concentration. A decrease of NP‐12 surface tension at low concentration and an increase of R‐11 surface tension in the presence of both dyes were observed along with a significant decrease of NP‐12 CMC values. A difference in the spectrophotometric absorbance of dye solutions in the presence of both surfactants, indicating a change in the environment of the dye chromophore, was also visible. These results confirm the formation of hydrophobic complexes of NP‐12 and hydrophilic complexes of R‐11 with both dyes.