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Protomicelles of Sodium Dodecyl Sulfate in a Strongly Diluted Aqueous Solution of Crown-Substituted Magnesium Phthalocyaninate
Colloid Journal ( IF 1.1 ) Pub Date : 2021-06-10 , DOI: 10.1134/s1061933x21030121
T. G. Movchan , A. I. Rusanov , E. V. Plotnikova

Abstract

Protomicelles represent a new concept of colloid science relevant to micelle-like aggregates of surfactants in solutions. In contrast to ordinary micelles, their formation requires no critical micelle concentration (CMC) and proceeds gradually through the adsorption of surfactant molecules or ions on a solubilization core at concentrations much lower than the CMC. A completely formed protomicelle looks like an ordinary solubilisate-containing micelle. Protomicelles can be formed on phthalocyanine monomers and dimers. In this work, the role of protomicelles in monomerization of crown-substituted magnesium phthalocyaninate (I) in aqueous sodium dodecyl sulfate (II) solutions has been studied spectrophotometrically at compound I concentrations of 0.38 and 1.2 μМ. Empirical methods have been developed for determining a new parameter, monomerization concentration (concentration of II required to initiate the monomerization of I), and it has been shown that the monomerization concentration decreases with an increase in the concentration of I. Another new parameter defined as the concentration of II corresponding to nearly complete monomerization of I has been studied in comparison with the CMC of II. For this purpose, the CMC has, for the first time, being measured (by conductometry) in the presence of protomicelles. The latter circumstance has been shown to decrease the CMC. At the same time, it has been revealed that the concentration corresponding to the completion of monomerization in the studied system nearly coincides with the CMC.



中文翻译:

十二烷基硫酸钠原胶束在强烈稀释的冠取代的酞菁镁水溶液中

摘要

原胶束代表了与溶液中表面活性剂的胶束状聚集体相关的胶体科学的新概念。与普通胶束相比,它们的形成不需要临界胶束浓度 (CMC),而是通过表面活性剂分子或离子以远低于 CMC 的浓度吸附在增溶核上而逐渐进行。一个完全形成的原胶束看起来就像一个普通的含增溶物的胶束。原胶束可以在酞菁单体和二聚体上形成。在这项工作中,在化合物 I 浓度为 0.38 和 1.2 μМ 的情况下,通过分光光度法研究了原胶束在十二烷基硫酸钠 (II) 水溶液中冠取代的酞菁镁 (I) 单体化中的作用。已经开发出用于确定新参数的经验方法,单体化浓度(启动 I 的单体化所需的 II 浓度),并且已经表明单体化浓度随着 I 浓度的增加而降低。另一个新参数定义为对应于 I 几乎完全单体化的 II 浓度已与 II 的 CMC 进行了比较研究。为此,CMC 首次在存在原胶束的情况下(通过电导测定法)进行了测量。后一种情况已被证明会降低 CMC。同时,研究表明,所研究体系中与单体化完成相对应的浓度几乎与 CMC 一致。并且已经表明单体化浓度随着 I 浓度的增加而降低。另一个新参数定义为对应于 I 几乎完全单体化的 II 浓度,与 II 的 CMC 进行了比较。为此,CMC 首次在存在原胶束的情况下(通过电导测定法)进行了测量。后一种情况已被证明会降低 CMC。同时,研究表明,所研究体系中与单体化完成相对应的浓度几乎与 CMC 一致。并且已经表明单体化浓度随着 I 浓度的增加而降低。另一个新参数定义为对应于 I 几乎完全单体化的 II 浓度,与 II 的 CMC 进行了比较。为此,CMC 首次在存在原胶束的情况下(通过电导测定法)进行了测量。后一种情况已被证明会降低 CMC。同时,研究表明,所研究体系中与单体化完成相对应的浓度几乎与 CMC 一致。这是第一次在原胶束存在的情况下(通过电导法)进行测量。后一种情况已被证明会降低 CMC。同时,研究表明,所研究体系中与单体化完成相对应的浓度几乎与 CMC 一致。这是第一次在原胶束存在的情况下(通过电导法)进行测量。后一种情况已被证明会降低 CMC。同时,研究表明,所研究体系中与单体化完成相对应的浓度几乎与 CMC 一致。

更新日期:2021-06-11
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