Nanostructure in Amphiphile-Based Deep Eutectic Solvents.
Nanostructure in Amphiphile-Based Deep Eutectic Solvents.
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DOI：
10.1021/acs.langmuir.3c02105
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发表时间：
2023-11-28
期刊：
影响因子：
--
通讯作者：
Edler KJ
中科院分区：
文献类型：
--
作者：
Manasi I;Schweins R;Ma K;Edler KJ
低共熔溶剂（DES）是一类新兴的现代，往往是“绿色”溶剂具有独特的性能。近年来，两亲性表面活性剂N-烷基-N，N-二甲基-3-铵基-1-丙磺酸盐（C12 & C14磺基甜菜碱）与（1 S）-（+）-10-邻苯二磺酸按1：1.5的摩尔比复配，形成了一种深共熔体系。由于组件的性质，可以预期在该DES中进行纳米结构化。在这项工作中，我们研究了天然纳米结构的DES包括C12-C18烷基链磺基甜菜碱与樟脑磺酸，以及它如何与极性和非极性物种，水和十二烷，分别相互作用，使用小角中子散射。通过使用对比度变化来突出溶剂组分和添加剂的相对位置，我们可以解析溶剂的结构以及它在与水和十二烷相互作用时如何变化。从纯DES散射显示对应于磺基甜菜碱的自组装的结构;结构的大小随着磺基甜菜碱的烷基链长度的增加而增加。水和十二烷分别与DES结构中的亲水和疏水部分（主要是磺基甜菜碱）相互作用，从而使整个结构溶胀和溶剂化。峰位置的偏移程度和溶胀取决于添加剂的浓度。溶液相组织和极性和非极性物种的相互作用，如这里所观察到的，有可能影响在这样的溶剂中生长的无机或聚合物材料的排序，为模板应用铺平了新的途径。
Deep eutectic solvents (DESs) are an emerging class of modern, often “green” solvents with unique properties. Recently, a deep eutectic system based on amphiphilic surfactant N-alkyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (C12 & C14 sulfobetaine) and (1S)-(+)-10-camphor-sulfonic acid in the molar ratio 1:1.5 has been reported. Nanostructuring can be expected in this DES due to the nature of the components. In this work, we have investigated the native nanostructure in the DES comprising C12–C18 alkyl chain sulfobetaines with camphor sulfonic acid and how it interacts with polar and nonpolar species, water and dodecane, respectively, using small angle neutron scattering. By using contrast variation to highlight the relative position of the solvent components and additives, we can resolve the structure of the solvent and how it changes upon interaction with water and dodecane. Scattering from the neat DES shows structures corresponding to the self-assembly of sulfobetaines; the size of the structure increases as the alkyl chain length of the sulfobetaines increases. Water and dodecane interact, respectively, with the hydrophilic and hydrophobic moieties in the DES structure, primarily the sulfobetaine, thereby swelling and solvating the entire structure. The extent of the shift of the peak position, and the swelling, depend on concentration of the additive. The solution phase organization and the interaction of polar and nonpolar species as observed here, have the potential to affect the ordering of inorganic or polymeric materials grown in such solvents, paving new avenues for templating applications.
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