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The formation of host–guest complexes between surfactants and cyclodextrins
Valente, Artur J. M.; Söderman, OlleCyclodextrins are able to act as host molecules in supramolecular chemistry with applications ranging from pharmaceutics to detergency. Among guest molecules surfactants play an important role with both fundamental and practical applications. The formation of cyclodextrin/surfactant host–guest compounds leads to an increase in the critical micelle concentration and in the solubility of surfactants. The possibil...
Homogeneous length scale of shear-induced multilamellar vesicles studied by dif...
Åslund, Ingrid; Medronho, Bruno; Topgaard, Daniel; Söderman, Olle; Schmidt, ClaudiaA recently developed protocol for pulsed gradient spin echo (PGSE) NMR is applied for the size determination of multilamellar vesicles (MLVs). By monitoring the self-diffusion behavior of water, the technique yields an estimate of the homogeneous length scale λhom, i.e. the maximum length scale at which there is local structural heterogeneity in a globally homogeneous material. A cross-over between local non-Ga...
Interactions between Gemini Surfactants, 12-s-12, and β-cyclodextrin As Investi...
Nilsson, Markus; Cabaleiro-Lago, Celia; Valente, Artur J. M.; Söderman, OlleThe interaction between β-cyclodextrin (CD) and gemini surfactant of the type alkyl-α,ω-bis(dodecyldimethylammonium bromide) with different spacer lengths of 2, 8, and 10 carbons has been investigated by means of electric conductivity (EC) and proton self-diffusion NMR at 298 K. The formation of a 2:1 (CD:gemini) complex in a two-step mechanism is observed with the first association constant (K11) higher than t...
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