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Vesicle to micelle transition in the ternary mixture of L121/SDS/D2O: NMR, EPR and SANS studies
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-11-10 00:00:00 , DOI: 10.1039/c7cp06796h G. K. S. Prameela 1, 2, 3, 4, 5 , B. V. N. Phani Kumar 1, 2, 3, 4, 5 , R. Ravikanth Reddy 1, 2, 3, 4, 5 , A. Pan 5, 6, 7, 8, 9 , J. Subramanian 1, 2, 3, 4, 5 , Sugam Kumar 5, 10, 11, 12 , V. K. Aswal 5, 10, 11, 12 , Joachim Kohlbrecher 13, 14, 15, 16 , A. B. Mandal 1, 2, 3, 4, 5 , S. P. Moulik 5, 6, 7, 8, 9
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-11-10 00:00:00 , DOI: 10.1039/c7cp06796h G. K. S. Prameela 1, 2, 3, 4, 5 , B. V. N. Phani Kumar 1, 2, 3, 4, 5 , R. Ravikanth Reddy 1, 2, 3, 4, 5 , A. Pan 5, 6, 7, 8, 9 , J. Subramanian 1, 2, 3, 4, 5 , Sugam Kumar 5, 10, 11, 12 , V. K. Aswal 5, 10, 11, 12 , Joachim Kohlbrecher 13, 14, 15, 16 , A. B. Mandal 1, 2, 3, 4, 5 , S. P. Moulik 5, 6, 7, 8, 9
Affiliation
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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] (∼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. 13C chemical shift analysis revealed that preferential binding of L121 occurred on the SDS micelle surface. Deuterium (2H) 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 2H NMR spin-relaxation and EPR rotational correlation times.
中文翻译：
L121 / SDS / D 2 O三元混合物中的囊泡向胶束转变：NMR，EPR和SANS研究
三嵌段共聚物L121（环氧乙烷）5（环氧丙烷）68（环氧乙烷）5（ 即E 5 P 68 E 5）的微观结构和动力学的细微变化，并使用高分辨率核磁共振（NMR），电子顺磁共振（EPR）和小角度中子散射（SANS）方法研究了水性介质中的十二烷基硫酸钠（SDS）系统。NMR自扩散测量有助于我们了解SDS与L121结合的性质以及它们的混合聚集体的形成。这些结果表明，即使在低[SDS]（〜2 mM）下，添加L121也可以稳定SDS的动力学。此外，[SDS]的增加导致SDS和L121的扩散行为逐渐发生变化。13 C化学位移分析表明，L121的优先结合发生在SDS胶束表面。氘（2H）NMR自旋弛豫数据证明，就弛豫速率变化而言，所形成的混合聚集体是非球形的，并且减慢了动力学。混合骨料的旋转相关时间是根据EPR分析估算的。SANS研究表明，低[SDS]时存在L121的单层和多层囊泡。在更高的[SDS]存在下，囊泡转化为混合的L121-SDS胶束。这通过测量2 H NMR自旋弛豫和EPR旋转相关时间得到支持。
更新日期：2017-11-23
中文翻译：
L121 / SDS / D 2 O三元混合物中的囊泡向胶束转变：NMR，EPR和SANS研究
三嵌段共聚物L121（环氧乙烷）5（环氧丙烷）68（环氧乙烷）5（ 即E 5 P 68 E 5）的微观结构和动力学的细微变化，并使用高分辨率核磁共振（NMR），电子顺磁共振（EPR）和小角度中子散射（SANS）方法研究了水性介质中的十二烷基硫酸钠（SDS）系统。NMR自扩散测量有助于我们了解SDS与L121结合的性质以及它们的混合聚集体的形成。这些结果表明，即使在低[SDS]（〜2 mM）下，添加L121也可以稳定SDS的动力学。此外，[SDS]的增加导致SDS和L121的扩散行为逐渐发生变化。13 C化学位移分析表明，L121的优先结合发生在SDS胶束表面。氘（2H）NMR自旋弛豫数据证明，就弛豫速率变化而言，所形成的混合聚集体是非球形的，并且减慢了动力学。混合骨料的旋转相关时间是根据EPR分析估算的。SANS研究表明，低[SDS]时存在L121的单层和多层囊泡。在更高的[SDS]存在下，囊泡转化为混合的L121-SDS胶束。这通过测量2 H NMR自旋弛豫和EPR旋转相关时间得到支持。
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