Department of Chemistry, Indian Institute of Technology, Kharagpur, WB, India.
J Phys Chem B. 2011 Jun 2;115(21):6957-63. doi: 10.1021/jp111755j. Epub 2011 May 6.
The effect of added room-temperature ionic liquids on the nature of water molecules in the palisade layer of a Triton X-100 (TX-100) micelle has been investigated using solvation and rotational relaxation studies of coumarin 153 in the presence of different wt % of [bmim][BF(4)] and thus to understand the changes in micellar palisade layer, especially the entrapped water structures in the palisade layer. It has been observed that in the presence of added [bmim][BF(4)] the solvation dynamics becomes faster. It has previously been demonstrated (Behera et al. J. Chem. Phys.2007, 127, 184501) that in the present micellar systems, in the presence of [bmim][BF(4)] micellar size and aggregation number (N(agg)) decreases giving rise to more water molecules penetrating in to the micellar phase which results in increased microfluidity. In accordance with solvation dynamics results, fluorescence anisotropy studies also indicate an increased microfluidity for the palisade layer of the TX-100 micelle with the added [bmim][BF(4)]. Wobbling-in-cone analysis of the anisotropy data also supports this finding.
已使用香豆素 153 在不同质量百分比的 [bmim][BF4] 存在下的溶剂化和旋转松弛研究，研究了室温离子液体的添加对 Triton X-100 (TX-100) 胶束的栅栏层中水分子性质的影响，从而了解胶束栅栏层的变化，特别是栅栏层中被包裹的水结构的变化。已经观察到，在添加 [bmim][BF4] 的情况下，溶剂化动力学变得更快。以前已经证明（Behera 等人，J. Chem. Phys.2007, 127, 184501），在目前的胶束体系中，存在 [bmim][BF4] 时，胶束尺寸和聚集数 (N(agg)) 减小，导致更多的水分子渗透到胶束相中，从而增加微观流动性。与溶剂化动力学结果一致，荧光各向异性研究也表明，添加 [bmim][BF4] 后 TX-100 胶束的栅栏层的微观流动性增加。各向异性数据的摆动圆锥分析也支持这一发现。
