Micellization Properties Of Surfactants Research Articles

Influence of phosphonium-based ionic liquid on the micellization behavior of surfactants system and potential application in paracetamol drug aggregation

The current study examines the effects of a phosphonium-based ionic liquid, trihexyltetra-decylphosphonium bis-(2,4,4-trimethyl pentyl)phosphinate [THTDPP], on the micellization properties of surfactants, namely sodium dodecyl sulfate (SDS) and Triton X-100 by using the stalagmometry, viscosity, colorimetric, and FTIR methods. The surface adsorption parameters, such as CMC, γCMC, Γmax, Amin, πCMC, and pC20, were determined using the stalagmometry method. The results show that with the addition of different weight percentages of [THTDPP], the CMC and γCMC values decreased considerably in the following order: water >0.5 wt% of IL > 0.7 wt% of IL > 1.0 wt% of IL. The Amin values decreased with an increase in the wt% of IL for Triton X-100, but for SDS, this value increased. The pC20 was observed to be greater in Triton X-100 compared to SDS. The ability of [THTDPP] to decrease the CMC was found to be greater in Triton X-100 compared to SDS. The relative viscosity was calculated, and the first observation was made at the pre-CMC stage, where the concentration of SDS+0.7 wt% IL was 4.0 mM. The second finding was made post-CMC at a concentration of 5.0 mM. Afterward, the relative viscosity graph grew slowly and gradually. The functional groups involved in the complexation between [THTDPP] and both surfactants were examined using FTIR spectroscopy. Additionally, the micellar solutions of surfactants + [THTDPP] were used to explore Paracetamol [PCM] aggregation. The findings from UV–vis spectroscopy show that Triton X-100 exhibits the highest binding affinity and has the most encouraging effect compared to SDS.

Interactions between cationic surfactants and 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin tetrasodium salt as seen by electric conductometry and spectroscopic techniques

Abstract The interaction between the anionic porphyrin 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin tetrasodium salt (Na4H2TPPS4) and alkyltrimethylammonium bromides (CnTAB), with different alkyl chain lengths (n = 12 and 16), in aqueous solutions have been studied by using electrical conductivity, potentiometry and spectroscopic (UV–vis and fluorescence) techniques. The effect of surfactant concentration in a concentration range involving the pre- and post-micelle region and temperature was evaluated. Interactions between surfactant and porphyrin lead to a three well-defined regions. At the lowest molar ratios, r = [CnTAB]/[Na4H2TPPS4] occur the disaggregation and deprotonation of porphyrins concomitantly with the formation of surfactant–porphyrin aggregates. These aggregates have a stoichiometry lower than the simple charge neutralization as due to the occurrence of multiple equilibria involving porphyrins. This also suggests that although electrostatic interactions are important, they are not the only driven-force for interaction. When surfactant is in excess (porphyrin saturation concentration The effect of porphyrin concentration and temperature on the micellization properties of surfactants was also analyzed, showing that temperature has no significant effect on the cmc of C16TAB. However, looking to the free energy of micellization the effect of temperature favours the micellization process, being such effect more pronounced for the most hydrophobic surfactant. This suggests that the degree of dissociation of counter ions in the micelle plays an important role on the micellization process in the presence of porphyrins.