Microcalorimetric Studies of the Interaction between DDAB and SDS and the Phase Behavior of the Mixture

Abstract

The interaction enthalpies between didodecyldimethylammonium bromide (DDAB) and sodium dodecyl sulfate (SDS) have been measured at 298.15 K using an isothermal titration microcalorimeter. From the variation of enthalpy with SDS concentration, the enthalpy of interaction between DDAB micelles and SDS, the enthalpy of formation of the DDA+SD-(cryst), the enthalpy of vesicle formation of DDAB−SDS, and the enthalpy of transition from vesicles to SDS-rich micelles have been determined to be −29.53, −125.8, 41.23, and 32.10 kJ/mol, respectively. The phase behavior of the DDAB−SDS aqueous mixture has also been investigated by turbidity measurements and transmission electron microscopy.

The preparation of calcium carbonate crystals regulated by mixed cationic/cationic surfactants

“…As reported, the critical micellar concentration (cmc) values of DDAB and [C 12 mim]Br determined at 25 1C are 0.31 [42] (Fig. 2a, a 0 ).…”

Rosin Surfactant QRMAE Can Be Utilized as an Amorphous Aggregate Inducer: A Case Study of Mammalian Serum Albumin

“…After that the ΔH° values of the complex became endothermic. Bai and coworkers [ 59 ] considered that the exothermic enthalpy mainly results from electrostatic interaction between oppositely charged head-groups. Therefore, in the present study, interactions between the oppositely charged surfactants and protein that also included electrostatic binding between the head-groups, hydrogen bonds between spacer and the hydrophobic association between the alkyl chains as well as associated dehydration and counter-ion liberation of the head-groups.…”

Spontaneous growth of self-relief wrinkles in freely floating lipid-based nanomembranes, formed on a reactive bath of polyoxometalate aqueous solution

“…1a), covering surface areas as large as 10 cm 2 , depending on the drop size, the DDAB concentration in chloroform and the ambient temperature. The exothermic reaction [29,30] between STA anions [SiW 12 O À4 40 ] and the cationic headgroups [N + ] of DDAB at the aqueous interface then couples with the high evaporation rate of chloroform to create a thermo-capillary convection in both the wetting film (before it dries), and the macroscopic drop ( Fig. 1a-d and Supplementary material 1).…”