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首页> 外文期刊>RSC Advances >Cloud point phenomena in aqueous solutions of an anionic gemini surfactant with a dibenzene spacer in the presence of tetra-n-propyl-ammonium bromide
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Cloud point phenomena in aqueous solutions of an anionic gemini surfactant with a dibenzene spacer in the presence of tetra-n-propyl-ammonium bromide

机译：阴离子双子粒子表面活性剂的浊点现象在四N-丙基 - 溴化铵存在下用二苯苯间隔物

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摘要

The cloud point (CP) behaviour of a carboxylate gemini surfactant, O , O ′-bis(sodium 2-dodecylcarboxylate)- p -dibenzenediol (referred to as C _(12) ? _(2) C _(12) ), in aqueous solution has been examined in the presence of tetra-propyl-ammonium bromide (Pr _(4) NBr), an organic salt with less hydrophobicity than that of commonly used species. The aggregates of C _(12) ? _(2) C _(12) in the solution were investigated by dynamic light scattering (DLS), steady-state fluorescence and rheological measurements. Compared with traditional single chain surfactants, C _(12) ? _(2) C _(12) showed the CP phenomena at very low surfactant concentrations. In the presence of Pr _(4) NBr, C _(12) ? _(2) C _(12) in aqueous solution formed several types of aggregates with different sizes. As the temperature was raised to the CP, the micelles rapidly associated, resulting in a cloud-like appearance of the solution. The mechanism has been attributed to C _(12) ? _(2) C _(12) , which can provide an attractive force for the micelle–micelle contact. Namely, with increasing temperature, some of the C _(12) ? _(2) C _(12) molecules within the micelles changed their configuration from cis - to trans -form, leading to some tails of C _(12) ? _(2) C _(12) in aggregates stretching towards the solution. When such micelles approached each other, these projecting tails interacted hydrophobically, and this resulted in the association of the micelles.
机译：羧酸甲酯Gemini表面活性剂，O，O'（钠2-十二烷基羧酸钠） - p-二苯并芘（12）α（2）C _（12））的浊点（CP）行为 - P-（2）C_（12）），在水溶液中已在四丙基 - 溴化铵（PR _（4）NBR）存在下检查，具有较少疏水性的有机盐比常用的物种较少。 C _（12）的聚集体？通过动态光散射（DLS），稳态荧光和流变测量来研究溶液中的_（2）C _（12）。与传统的单链表面活性剂相比，C _（12）？ _（2）C _（12）在非常低的表面活性剂浓度下显示CP现象。在PR _（4）NBR的情况下，C _（12）？ _（2）水溶液中的C _（12）形成几种类型的聚集体，具有不同的尺寸。随着温度升高到CP，胶束迅速相关，导致溶液的云状外观。该机制归因于C _（12）？ _（2）C _（12），可以为胶束胶束接触提供有吸引力的力。即，随着温度的增加，一些C _（12）？ _（2）C _（12）胶束内的分子从顺式改变了它们的配置 - 逆变形，导致一些C _（12）的尾部？ _（2）C _（12）在伸展溶液中的聚集体中。当这些胶束彼此接近时，这些突出的尾部疏水地相互作用，这导致胶束的结合。

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