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Characterization of the Distribution of Pyrene Molecules in Confined Geometries with the Model Free Analysis
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1021/acs.jpcb.7b08414 Xinzhi Cao 1 , Remi Casier 1 , Hunter Little 1 , Jean Duhamel 1
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1021/acs.jpcb.7b08414 Xinzhi Cao 1 , Remi Casier 1 , Hunter Little 1 , Jean Duhamel 1
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Evidence is provided showing that global Model Free Analysis (MFA) of monomer and excimer fluorescence decays of pyrene dissolved in aqueous solutions of sodium dodecyl sulfate (SDS) provides the same structural and dynamic information on SDS micelles as the well-established Micelle Model (MM) does. Both MFA and MM were employed to characterize the quenching kinetics between dyes and quenchers located in surfactant micelles and the aggregation number of surfactant micelles. However, contrary to the MM, which assumes that dyes and quenchers distribute themselves among SDS micelles according to a Poisson distribution and react with a rate constant that is proportional to the number of reactants in a micelle, the MFA accomplishes this task without making any assumption about the process of pyrene excimer formation in SDS micelles. The ability of the MFA to retrieve accurately the molar fraction of pyrene molecules that are isolated in SDS micelles and do not form excimers was taken advantage of to establish that it equaled the Poisson probability of exciting micelles that contained a single pyrene. The molar fraction of isolated pyrenes could then be utilized to determine the aggregation number of the SDS micelles, and the rate constant of excimer formation between one excited- and one ground-state pyrene located inside a same micelle. Within experimental error, both the MFA and MM yielded the same micelle aggregation number and rate constant of excimer formation, with the MFA making no prior assumptions about the physical principles underlying the process of excimer formation contrary to the MM. The ability of the MFA to retrieve quantitative parameters providing structural and dynamic information about macromolecular systems with no prior knowledge about their architecture or labeling scheme implies that it can be applied to characterize a wide range of macromolecular architectures in solution.
中文翻译：
用无模型分析表征P几何中的ene分子分布
提供的证据表明，溶解在十二烷基硫酸钠（SDS）水溶液中的pyr的单体和受激准分子荧光衰减的全球自由模型分析（MFA）提供了与完善的Micelle模型（MM）相同的SDS胶束结构和动态信息） 做。MFA和MM均用于表征位于表面活性剂胶束中的染料和猝灭剂之间的猝灭动力学以及表面活性剂胶束的聚集数。但是，与MM假定染料和猝灭剂根据Poisson分布在SDS胶束中分布并以与胶束中反应物数量成比例的速率常数进行反应相反，MFA无需做任何假设即可完成此任务SDS胶束中of准分子形成的过程 利用MFA准确检索在SDS胶束中分离且不形成准分子的pyr分子的摩尔分数的能力来确定其等于激发包含单个pyr的胶束的泊松概率。然后，可以利用分离的pyr的摩尔分数来确定SDS胶束的聚集数，以及位于同一胶束内的一个激发态pyr基态与一个基态pyr之间的准分子形成速率常数。在实验误差范围内，MFA和MM均产生相同的胶束聚集数和准分子形成速率常数，而MFA并未就与MM相反的准分子形成过程的物理原理做出任何先验假设。
更新日期：2017-12-06
中文翻译：
用无模型分析表征P几何中的ene分子分布
提供的证据表明，溶解在十二烷基硫酸钠（SDS）水溶液中的pyr的单体和受激准分子荧光衰减的全球自由模型分析（MFA）提供了与完善的Micelle模型（MM）相同的SDS胶束结构和动态信息） 做。MFA和MM均用于表征位于表面活性剂胶束中的染料和猝灭剂之间的猝灭动力学以及表面活性剂胶束的聚集数。但是，与MM假定染料和猝灭剂根据Poisson分布在SDS胶束中分布并以与胶束中反应物数量成比例的速率常数进行反应相反，MFA无需做任何假设即可完成此任务SDS胶束中of准分子形成的过程 利用MFA准确检索在SDS胶束中分离且不形成准分子的pyr分子的摩尔分数的能力来确定其等于激发包含单个pyr的胶束的泊松概率。然后，可以利用分离的pyr的摩尔分数来确定SDS胶束的聚集数，以及位于同一胶束内的一个激发态pyr基态与一个基态pyr之间的准分子形成速率常数。在实验误差范围内，MFA和MM均产生相同的胶束聚集数和准分子形成速率常数，而MFA并未就与MM相反的准分子形成过程的物理原理做出任何先验假设。
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