MIXED MICELLES OF CATIONIC SURFACTANTS IN AQUEOUS POLYETHYLENE GLYCOL 1000
作者:
MandeepSingh Bakshi,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 1999)
卷期:
Volume 20,
issue 7
页码: 1715-1735
ISSN:0193-2691
年代: 1999
DOI:10.1080/01932699908943886
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The conductances of tetradecyltrimethylammonium bromide (TTAB) + dodecyltrimethylammonium bromide (DTAB) mixtures over the entire mole fraction range of TTAB (αOITTAB) were measured in aqueous polyethylene glycol 1000 (PEG) containing 1, 2, 5 and 10 wt% of PEG at 30 °C. From the conductivity data, various micellar parameters were computed. The results have been explained on the basis of the medium effects as well as the adsorption of additive molecules at micelle-solution interface. The non-ideality in TTAB+DTAB mixtures was evaluated by using the regular solution theory and Motomura's formulation based on the excess thermodynamic quantities. It has been found that the regular solution interaction parameter (β) and micellar mole fraction (¯xm2) remain almost unaffected even in the presence of upto 10 wt% of PEG. These results suggest that the additive remains only in the aqueous phase and perhaps only changing the environment surrounding the micelles by adsorbing at the micelle-solution interface.
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