Vesicle to micelle transition in the ternary mixture of L121/SDS/D2O: NMR, EPR and SANS studies
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
View Archive Info| Field | Value | |
| Title |
Vesicle to micelle transition in the ternary mixture of L121/SDS/D2O: NMR, EPR and SANS studies
|
|
| Creator |
Prameela, G K S
Kumar, B V N Phani Reddy, R Ravikanth Pan, A Subramanian, J Kumar, Sugam Aswal, V K Kohlbrecher, Joachim Mandal, A B Moulik, S P |
|
| Subject |
Microstructure and Characterization
|
|
| Description |
Subtle changes in the microstructure and dynamics of the triblock copolymer L121, (ethylene oxide) 5 (propylene oxide) 68 (ethylene oxide) 5 i. e., E5P68E5, and sodium dodecylsulfate (SDS) system in aqueous medium were investigated using high-resolution nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR) and small-angle neutron scattering (SANS) methods. NMR self-diffusion measurements helped us to understand the nature of binding of SDS with L121, and the formation of their mixed aggregates. These results showed that even at low SDS] (similar to 2 mM), the addition of L121 stabilized the dynamics of SDS. Furthermore, the increase in SDS] resulted in progressive changes in the diffusion behavior of both SDS and L121. C-13 chemical shift analysis revealed that preferential binding of L121 occurred on the SDS micelle surface. Deuterium (H-2) NMR spin-relaxation data evidenced that the formed mixed aggregates were non-spherical in terms of relaxation rate changes, and slowed the dynamics. The rotational correlation times of mixed aggregates were estimated from EPR analysis. A SANS study indicated the presence of uni-and multi-lamellar vesicles of L121 at low SDS]. The vesicles transformed to mixed L121-SDS micelles in the presence of a higher SDS]. This was supported by the measurements of H-2 NMR spin-relaxation and EPR rotational correlation times.
|
|
| Publisher |
Royal Society of Chemistry
|
|
| Date |
2017-12
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cgcri.csircentral.net/4098/1/mondal.pdf
Prameela, G K S and Kumar, B V N Phani and Reddy, R Ravikanth and Pan, A and Subramanian, J and Kumar, Sugam and Aswal, V K and Kohlbrecher, Joachim and Mandal, A B and Moulik, S P (2017) Vesicle to micelle transition in the ternary mixture of L121/SDS/D2O: NMR, EPR and SANS studies. Physical Chemistry Chemical Physics, 19 (47). pp. 31747-31755. ISSN 1463-9076 |
|
| Relation |
http://cgcri.csircentral.net/4098/
|
|