In:
Chinese Journal of Chemical Physics, AIP Publishing, Vol. 27, No. 3 ( 2014-06-27), p. 307-314
Abstract:
The interaction between N, N′-bis(dimethyldodecyl)-1,6-hexanediammoniumdibromide (G12-6-12) and cetyltrimethylammonium bromide (CTAB) in D2O aqueous medium has been investigated by NMR at 298 K. The measured critical micelle concentration (cmc) of G12-6-12 and CTAB are about 0.773 and 0.668 mmol/L, respectively. The cmc* (cmc of mixture) values are less than CMC* (cmc of ideally mixed solution) in the mixed system, and the interaction parameter βM & lt;0 at different molar fractions α of G12-6-12 in the mixed systems, but just when α≤0.3, cmc* values are much smaller than CMC*, and βM satisfies the relation of ∣βM∣ & gt;∣ln(cmc1/cmc2)∣ (cmc1: cmc of pure G12-6-12 and cmc2: cmc of pure CTAB). The results indicate that there exists synergism between G12-6-12 and CTAB, and they can form mixed micelles, which is further proven by 2D NOESY and self-diffusion coefficient D experiments. There are intermolecular cross peaks between G12-6-12 and CTAB in 2D NOESY, and the radius of micelles in mixed solution is bigger than that in G12-6-12 pure solution in D experiments, indicating there are mixed micelles. However, when α & gt;0.3, we find that cmc*≈CMC*, βM≈0, obviously, the two surfactants are almost ideal mixing fitting the pseudo-phase separation model and regular solution theory.
Type of Medium:
Online Resource
ISSN:
1674-0068
,
2327-2244
DOI:
10.1063/1674-0068/27/03/307-314
Language:
English
Publisher:
AIP Publishing
Publication Date:
2014
detail.hit.zdb_id:
2381472-X
SSG:
6,25
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