Study of the Interaction Between Methyl Orange and Mono and Bis-Quaternary Ammonium Surfactants |
| |
Authors: | Saliha Alehyen Fatima Bensejjay Mohammed El Achouri Lourdez Pérez Maria Rosa Infante |
| |
Affiliation: | 1.Laboratoire de Chimie Organique et d’Etudes Physico-chimiques,Ecole Normale Supérieure,Rabat,Morocco;2.Laboratoire de Physico-chimie des Matériaux,Ecole Normale Supérieure,Rabat,Morocco;3.Instituto de Química Avanzada de Catalunya,CID-CSIC,Barcelona,Spain |
| |
Abstract: | The solubilization and interaction of an azo-dye (methyl orange) with dodecyl trimethyl ammonium bromide and cationic gemini
surfactants in the series of alkanediyl α,ω-bis(dimethyl alkyl ammonium)bromide)] referred to as (m-s-m), m = 10, 12, 14 and s = 2, 3, 4 were investigated by means of UV–Vis spectroscopy. Aggregation with the anionic dye was reflected by a hypsochromic
shift with a decrease in the intensity of the absorption band. The results also show a bathochromic shift followed by a sharp
increase in the intensity of the maximum absorption band λmax after the critical micellar concentration (CMC). This indicates that the dye solubility increased with increasing surfactant
concentration. It was also observed that the aggregation of surfactant and dye takes place at a surfactant concentration far
below the CMC of the individual surfactant. The effects of the chain length as well as the spacer length of gemini surfactants
on the critical aggregation concentration and CMC were also examined. Moreover, the partition coefficients between the bulk
water and surfactant micelles K
S and K
X as well as the Gibbs energies of distribution of dye between the bulk water and surfactant micelles were determined using
the pseudo-phase model. The effect of the hydrophobic chain length and spacer of gemini surfactants on the distribution parameters
is also reported. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|