Effect of Crown Ether 1,4,7,10,13,16-Hexaoxacyclooctadecane on the Structure of Sodium Dodecyl Sulfate and Dodecyltrimethylammonium Bromide Aqueous Micellar Solutions

Self-assembly control via molecular recognition: Effect of cyclodextrins on surfactant micelle structure and interactions determined by SANS

“…The increase in SDS micelle size and aggregation number, and change in micelle shape upon surfactant addition that is observed here are consistent with what has been reported in the literature [37][38][39][40][41][42][43][44]47,50,51]. Similarly, stronger interactions, higher total micelle charge, and reduction in isothermal compressibility with increasing surfactant concentration have also been reported in the literature [52].…”

Green Synthesis, Molecular Characterization and Associative Behavior of Some Gemini Surfactants without a Spacer Group

“…The size growths with the concentration for compounds 4b – d are similar to those observed for aqueous solutions of a large variety of monomeric surfactants [16,17,18,19,20]. …”

18‐crown‐6 as a class I organic modifier in MEKC

“…Of particular interests to SDS MEKC are the formation of an 18C6–Na + complex and the effect of this complexation on the SDS PSP. 18C6 and Na + form a 1:1 complex that is stable as a result of strong ion–dipole interactions ( K stab =6.6 M −1 at 25°C) 11–16. When introduced to an aqueous solution of SDS, 18C6 sequesters Na + , leading to an increase in $SO_{4}^{ - }$ head group repulsion.…”

“…When introduced to an aqueous solution of SDS, 18C6 sequesters Na + , leading to an increase in $SO_{4}^{ - }$ head group repulsion. This increased repulsion, in turn, decreases micelle size, surface charge density, surface polarity, and the CMC 12–14, 17–25.…”

“…Straight chain alcohol or diol class I modifiers “puncture” the micelle surface, with hydrophilic portions residing in the palisade layer and the chain penetrating to a depth dictated by its length 1, 2, 5–7, 9, 10, 26. 18C6, via Na + complexation, is localized to the external palisade layer with no penetration to lower palisade layers or the micelle core 12, 13, 17, 18, 20, 21, 25. This complexation also effectively eliminates 18C6–analyte interactions, unlike alcohol or diol class I modifiers, which are free to interact with analytes 1, 2.…”