Interaction Between Cationic Gemini and Monomeric Surfactants: Micellar and Surface Properties

Abstract

Attraction effects in the mixed micelle of gemini (C 16 -12-C 16 , 2Br -) and monomeric surfactants i.e. cetyltrimethylammonium bromide (CTAB), cetyltriphenylphosphonium bromide (CTPB) and cetyltributylphosphonium bromide (CTBuPB) mixtures in aqueous solution were investigated by conductivity and surface tension measurements. The attractive interaction of surfactants in the mixed micelle leading to non-ideality has theoretically treated by Clint's and Rubingh's model in the light of regular solution theory. The experimental critical micelle concentration (cmc) values were lower than predicted from ideal mixture theory. The negative values of interaction parameters (β m and β σ ) for mixed micelle formation indicate the attractive interaction for all the systems. The Motomura's theory was used to determine the composition of each compound in mixed micelles (X ideal ). The excess free energy of the mixed systems was also calculated and the obtained negative values for all the mixed systems studied gave an indication that the mixed micelles are thermodynamically more stable relative to the individual component.

Effect of Polar Organic Solvents on Self‐Aggregation of Some Cationic Monomeric and Dimeric Surfactants

“…The CMC values obtained from the conductivity method are in good agreement with the surface tension and fluorescence methods. The experimental CMC values are in close agreement with published literature data [24,28,[37][38][39][40]54]. It is observed that an increase in the amount of EG and DEG increases the degree of ionization for all the studied surfactants.…”

“…This may be due to the reduced [34], b Ref. [40] hydrophobic character of the solution near the interface in the presence of a co-solute facilitating the accumulation of surfactant monomer at the air-liquid interface and hence the observed decrease in surface excess concentration [17,53].…”

Solubilization of polycyclic aromatic hydrocarbons in structurally different gemini and monomeric surfactants: A comparative study

“…Surfactants with lower CMC values possess greater solubilizing efficiency [27]. We have already reported the CMC of investigated gemini and monomeric cationic surfactants in aqueous solution in Table 2 [27,44,45].…”

Synthesis and surface studies of anionic gemini surfactant in the different counter-ions

“…Gemini or dimeric surfactants are twin molecules of monomeric surfactants chemically linked at the hydrophilic head group by a spacer [1][2][3][4][5][6]. Any innovation in preparation of gemini surfactants has been considered important because of their huge acceptability in the numerous industrial applications viz.…”