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Ag(I)-mediated self-assembly of anisotropic rods and plates in the surfactant mixture of CTAB and Pluronics

机译：Ag（i）在CTAB和Pluronics的表面活性剂混合物中介断了各向异性棒和板的自组装

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摘要

One-dimensional (1D) metallogels are commonly observed in metal-coordinated complexes, but there are not many examples of soft crystalline solids which are generated by the self-assembly of metal-polymer complexation in a non-gel state. In a continued effort to obtain 1D materials by utilizing the tendency of Pluronic triblock copolymers to be micellized anisotropically at an elevated temperature, we investigate Ag(I)-mediated self-assembly of the surfactant mixture of Pluronic copolymers and cetyltrimethylammonium bromide (CTAB). At sufficiently high temperature, Pluronic copolymers are known to organize into many crystalline mesophases, such as body-centered-cubic, hexagonal, and lamellar phases. Four Pluronics of L-31, L-64, P-123, and F-108 were studied, and at the concentration of 17.9%, macroscale 1D rods with the aspect ratios ranging from 3.07 to 12.8 are obtained. At the concentration of 35.7%, anisotropic two dimensional (2D) planar plates are observed. These planar structures were believed to be generated from 2D lamellar mesophases, which is consistent with the general phase diagram of Pluronic copolymers that shows lamellar phase with the highest concentration. In the absence of ascorbic acid, rods and plates of larger size are produced. Rather than as a reductant, ascorbic acid is thought to play the roles of an agent to increase the hydrophilicity, and as a mediator to determine the dimension of rods and plates by hindering the long range self-assembly of alkyl chains. Dehydration by the addition of AgNO3, and the increase of hydrophobicity enable self-assembly of alkyl groups of CTAB and Pluronics and promote the formation of crystalline soft solids.
机译：一维（1D）metallogels在金属配位的配合物通常观察到的，但也有不是其由自组装的金属 - 聚合物络合在非凝胶状态下产生软的结晶固体的许多例子。在继续努力通过利用普朗尼克三嵌段共聚物的倾向，以获得1D材料中在升高的温度各向异性胶束化，我们研究的Ag（I）介导的自组装的Pluronic共聚物和十六烷基三甲基溴（CTAB）的表面活性剂混合物的。在足够高的温度，普朗尼克共聚物是已知的组织成许多介晶相，例如体心立方，六方，和层状相。 L-31，L-64的四个普朗尼克，P-123和F-108进行了研究，并以17.9％的浓度，获得宏观1D杆与纵横比为3.07至12.8。在35.7％的浓度，观察到各向异性的二维（2D）平面的板。据信这些平面结构被从2D层状中间相，这与普朗尼克共聚物的一般相图一致生成示出了具有最高浓度层状相。在不存在的抗坏血酸，杆和较大尺寸的板制成。而不是作为还原剂，抗坏血酸被认为发挥着剂的作用，以增加亲水性，和作为介体通过阻碍长范围自组装烷基链，以确定杆和板的尺寸。脱水通过添加硝酸银，和疏水性的增加使自组装CTAB和普朗尼克的烷基基团的和促进结晶软固体的形成。

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  • 来源
    《RSC Advances》 |2019年第8期|共10页
  • 作者

    Song Hyon-Min; Zink Jeffrey I.;

  • 作者单位

    Dong A Univ Dept Chem Busan 604714 South Korea;

    Univ Calif Los Angeles Dept Chem &

    Biochem Los Angeles CA 90095 USA;

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  • 正文语种 eng
  • 中图分类 化学;
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