首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Solvation Dynamics in the Water Pool of Aerosol Sodium Dioctylsulfosuccinate Microemulsion: Effect of Polymer
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Solvation Dynamics in the Water Pool of Aerosol Sodium Dioctylsulfosuccinate Microemulsion: Effect of Polymer

机译:气溶胶二辛基磺基琥珀酸钠微乳液的水溶剂化动力学:聚合物的影响

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摘要

Solvation dynamics of 2,6-p-toluidinonaphthalene sulfonate (TNS) is studied in a large water pool (w_0 = 56) of aerosol sodium dioctylsulfosuccinate (AOT) microemulsion in n-heptane in the absence and the presence of a hydrophilic polymer, poly(vinylpyrrolidone) (PVP). The solvation dynamics of TNS in AOT microemulsions without polymer is found to be biexponential with a major component of 300 ± 30 ps (75%) and a slow component of 500 ± 50 ps (25%) with an average solvation time of 350 ps. In the presence of a polymer (0.75 wt % PVP) in the water pool, the solvation dynamics of TNS is found to be faster with components 70 ± 10 ps (75%) and 250 ± 25 ps (25%) and having an average solvation time of 115 ps. The very fast solvation dynamics in the presence of 0.75 wt % PVP in the water pool is similar to that in bulk water and is ascribed to strong binding of TNS to PVP. When the concentration of the polymer is increased to 2.5 wt % PVP, the solvation dynamics of TNS in polymer encapsulated microemulsions is found to be markedly slower. In the presence of 2.5 wt % PVP, the solvation dynamics in the water pool exhibits components of 100 ± 10 ps (33%), 600 ± 50 ps (47%) and 11 ± 1 ns (20%), with an average solvation time 2500 ps. This clearly indicates that, at high concentration of the polymer, dynamics of the water molecules inside the water pool of microemulsion is severely constrained.
机译:在不存在和存在亲水性聚合物的情况下,在正庚烷气溶胶二辛基磺基琥珀酸钠(AOT)微乳液的大型水池(w_0 = 56)中研究了2,6-对甲苯基萘磺酸盐(TNS)的溶剂化动力学(乙烯基吡咯烷酮)(PVP)。发现在没有聚合物的AOT微乳液中TNS的溶剂化动力学是双指数的,主要成分为300±30 ps(75%),慢成分为500±50 ps(25%),平均溶解时间为350 ps。在水池中存在聚合物(0.75 wt%PVP)的情况下,发现TNS的溶剂化动力学更快,组分为70±10 ps(75%)和250±25 ps(25%),且平均值溶解时间为115 ps。在水池中存在0.75 wt%PVP时,非常快的溶剂化动力学与大量水中的相似,并且归因于TNS与PVP的牢固结合。当聚合物的浓度增加到2.5重量%PVP时,发现TNS在聚合物包封的微乳状液中的溶剂化动力学明显变慢。在存在2.5 wt%PVP的情况下,水池中的溶剂化动力学表现为100±10 ps(33%),600±50 ps(47%)和11±1 ns(20%)的分量,平均溶剂化时间2500 ps。这清楚地表明,在聚合物的高浓度下,微乳液的水池内部的水分子的动力学受到严重限制。

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