Micellization of Cetyltrimethylammonium Bromide: Effect of Small Chain Bola Electrolytes

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• 作者：Animesh Pan ; Pallabi Sil ; Sounak Dutta ; Prasanta Kumar Das ; Subhash Chandra Bhattacharya ; Animesh Kumar Rakshit ; Vinod Kumar Aswal ; Satya Priya Moulik
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：March 20, 2014
• 年：2014
• 卷：118
• 期：11
• 页码：3041-3052
• 全文大小：543K
• 年卷期：v.118,no.11(March 20, 2014)
• ISSN：1520-5207

文摘

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 鈮?2 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鈥檚 thermodynamic model. Hydrodynamic radius (R_h), Zeta-potential (味), and electrical double layer behavior of bola interacted CTAB micelles were assessed. From SANS measurements, micelle shape, shape parameters, aggregation number (N_agg), 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 鈥渁mphiphilic electrolytes鈥?to influence the surface and micelle forming properties of CTAB.