Informatics Publishing Limited

Neelam Seedher ¹, Manish Manik ¹

Affiliations
1 Department of Chemistry, Panjab University, Chandigarh-160014, IN

Abstract

Solubilization of water in cationic + non-ionic and anionic + non-ionic mixed surfactant reverse micellar systems has been studied. Solubilization capacity increased significantly on mixing cationic/anionic sufactants with non-ionic surfactants. For each surfactant system there is an optimum ratio in which the two surfactants must be mixed to enhance their water solubilization capacity to maximum. Conductivity measurements showed that the percolation threshold point was a function of the composition of mixed micelles. Near infrared spectra of solubilized water showed broad band at 1930-1940 nm.

Keywords

Solubilization, Water, Alcohol-Free, Mixed Micelles.

Full Text

     

Neelam Seedher ¹, Yashumati Bhamri ¹

Affiliations
1 Department of Chemistry, Punjab University, Chandigarh 160014, IN

Abstract

The absorption spectra (450-800 nm) of the dye Eriochrome Black T, its complexes with cetylpyridinium bromide (CPB) and CPB-metal ions, dye-CPS and dye-CPB-metal ion complexes have been studied. The dye showed marked bathochromic and hyperchromic effects in the presence of the surfactant. The optimum dye-to-surfactant ratio for maximum spectral shift was found to be 1:6 Absorption spectrum of dye-surfactant complex was significantly altered in the presence of metal ions. Dye surfactant complex could be used as a modified reagent for micro-determination of eight metal ions. The dye-surfactant-metal ion complexes could be represented as [Erio T (CPB)₆]_yM with y varying from 1 to 4 for different metal ions.

Keywords

Eriochrome Black T, Cetylpyridinium Bromide-Metal Ion Complexes, Spectrophotometry.

Full Text

     

Neelam Seedher ¹, Anju Saini ¹

Affiliations
1 Department of Chemistry, Panjab University, Chandigarh, 160014, IN

Abstract

Interaction of cationic surfactant, CPB and anionic surfactant, SDBS with methyl orange and four triphenylmethane dyes, BPB, CBB, CR and TB has been studied spectrophotometrically. Results have been discussed in terms of mode of interaction of surfactants with dyes and the association constants involved. Association constants were of the order of 105, consistent with non-covalent interactions.

Keywords

Dye, Surfactant, Interaction.

Full Text