Surfactants with an amide group “spacer”: Synthesis of 3-(acylaminopropyl)trimethylammonium chlorides and their aggregation in aqueous solutions

Synthesis and micellar properties of surface-active ionic liquids: 1-Alkyl-3-methylimidazolium chlorides

“…One empirical scale to quantify this property is log P which is based on the partition coefficient of a substance between n-octanol and water (where both solvents are mutually saturated): log P = log([substance] n-octanol /[substance] water ) [55]. Indeed, for the same range of R (C 10 to C 16 ), G 0 head-group for RBzMe 2 Cl are smaller than those of RMe 3 Cl [39,56]. This is due to the fact that the benzyl group is more hydrophobic than the methyl group; log P for benzyldimethylamine and trimethylamine (models for the head-groups) are 2.31 and 0.16, respectively [57].…”

Synthesis and antimicrobial properties of polymerizable quaternary ammoniums

“…This approach appears very useful but gives values of a which are little over-estimated because the conductance above the CMC is attributed only to the counterion. However, this method is a very useful approximation [30,31] when N ag is not available and was used in our study.…”

Aggregation of new bipolar glucosyled and cationic fluoroamphiphiles in aqueous media

“…In the studied series, the ''anomalous'' c cmc = 28 mN suggests that the F11-Glu-NI has a much more polar or less ''fluorinated'' environment than expected in a gradually increase in the fluorocarbon tail. Moreover, as the chain length increases, a large increase in the molecular surface area a 0 is noticed (16% per added CF 2 , see Table 1), whereas the chain length increase is generally known to give more or less packing of the surfactant molecules at the air/water interface [34,35]. A 14% decrease in a 0 per added CF 2 is thus observed for pyridinium-type fluorinated surfactants and a 2-13% decrease is observed for cationic hydrocarbon surfactants.…”

“…However, to ovoid the overestimated b values obtained by this method [45,46] who leads to underestimated values of the aggregation number, we have recently proposed a better calculation of this parameter [17] by using another approach of the Evans Eq. (10), taken into account the results obtained for homologous surfactants with iodide counter ions [35]. The modified Evans equation becomes:…”