Abstract
A phase study was completed on aqueous sodium dodecylbenzenesulfonate (SDBS) and tetra-n-butyl-ammonium bromide (Bu4NBr) systems, and consolute boundaries were drawn through cloud points. Samples were selected from both miscibility regions [under the lower consolute boundary (LCB) and above the upper consolute boundary (UCB)] for small-angle neutron scattering (SANS) studies. In the first set of experiments, the effect of varying Bu4NBr concentration on micellular parameters of 100 mM SDBS was studied at 30°C. The pure SDBS micelle has an aggregation number (n s ) of 51, and the effective charge on the monomer (α) is 0.17. With the addition of Bu4NBr, the n s of SDBS micelles increases while α decreases. The system with [Bu4NBr]=39.5 mM (an above-UCB sample) showed clouding near room temperature (≈29°C) and had a high n s value (300) and a low α (=0.09). The data indicated that the micelles lose ionic character in the presence of Bu4NBr. The temperature effect on this sample shows that α remains almost constant, while n s decreases on heating. A similar effect was observed with samples of lower Bu4NBr concentration (32 or 25 mM) in the presence of 100 mM SDBS. The same type of temperature effect was seen on a sample of under-LCB region (50 mM SDBS+32 mM Bu4NBr); the n s values increased significantly as the LCB was approached. The overall SANS observations suggest that the micelles have low ionic character together with high n s values (a case of micellar growth) near LCB/UCB.
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Abbreviations
- BARC:
-
Bhabha Atomic Research Centre
- Bu4NBr:
-
tetra-n-butylammonium bromide
- CP:
-
cloud point
- LCB:
-
lower consolute boundary
- n s :
-
aggregation number
- SANS:
-
small-angle neutron scattering
- SDBS:
-
sodium dodecylbenzenesulfonate
- SDS:
-
sodium dodecyl sulfate
- UCB:
-
upper consolute boundary
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Kumar, S., Sharma, D., Sharma, D. et al. Small-angle neutron scattering studies on sodium dodecylbenzenesulfonate-tetra-n-butylammonium bromide systems. J Surfact Deterg 9, 77–82 (2006). https://doi.org/10.1007/s11743-006-0378-7
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DOI: https://doi.org/10.1007/s11743-006-0378-7