Micellization of cetyltrimethylammonium bromide: effect of small chain bola electrolytes

Pan, Animesh ; Sil, Pallabi ; Dutta, Sounak ; Das, Prasanta Kumar ; Bhattacharya, Subhash Chandra ; Rakshit, Animesh Kumar ; Aswal, Vinod Kumar ; Moulik, Satya Priya (2014) Micellization of cetyltrimethylammonium bromide: effect of small chain bola electrolytes The Journal of Physical Chemistry B, 118 (11). pp. 3041-3052. ISSN 1520-6106

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp4108427

Related URL: http://dx.doi.org/10.1021/jp4108427


Sodium dicarboxylates (or Bola salts) with methylene spacers 0, 2, 4, 6, 8, and 10 were studied in aqueous solution to investigate their influence on the micellization of cetyltrimethylammonium bromide (CTAB). Since bolas with spacer length ≤12 are known not to micellize in general, the herein used sodium dicarboxylates were treated as 2:1 amphiphilic electrolytes which reduced surface tension of water (except sodium oxalate with zero spacer) without self-association. Their concentration dependent conductance was also linear without breaks. The bolas affected the micellization of CTAB but acted like salts to decrease its CMC. Their combinations did not form bilayer aggregates as found in vesicles. Nevertheless, they synergistically interacted with CTAB at the air/water interface as revealed from Rosen’s thermodynamic model. Hydrodynamic radius (Rh), Zeta-potential (ζ), and electrical double layer behavior of bola interacted CTAB micelles were assessed. From SANS measurements, micelle shape, shape parameters, aggregation number (Nagg), surface charge of the bola influenced CTAB micelles were also determined. NMR study as well supported the non-mixing of bolas with the CTAB micelles. They interacted in solution like "amphiphilic electrolytes" to influence the surface and micelle forming properties of CTAB.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:108575
Deposited On:01 Feb 2018 11:14
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