The use of any new extractant requires the study of its tendency to form third phases. To understand the phase separation process it is important to have knowledge of the molecular scale phenomena present in the system. This includes the mixing of the substances and the behavior and nature of the aggregates. Here we report the mixing properties of N,N,N′,N′-tetra-(2-ethyl hexyl) diglycolamide (TEHDGA)–dodecane–isodecanol (in the absence and presence of micellar aggregates) which is recognized as a promising system for the separation of minor actinides through the conventional solvent extraction route. The nature of interactions between TEHDGA and isodecanol was investigated using several techniques, including density and speed of sound measurements, ultraviolet absorption spectroscopy and computational studies. The TEHDGA–isodecanol interaction was found to be favored over the inter-isodecanol interaction. On equilibrating the organic phase with nitric acid, some indication of pre-micellar aggregation was obtained. Increase of micellar aggregate size on addition of isodecanol was indicated.

中文翻译：

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TEHDGA 与异癸醇在十二烷中混合的热力学：与硝酸水溶液平衡的影响

任何新萃取剂的使用都需要研究其形成第三相的趋势。要了解相分离过程，了解系统中存在的分子尺度现象非常重要。这包括物质的混合以及聚集体的行为和性质。在这里，我们报告了 N,N,N',N'-四-（2-乙基己基）二甘醇酰胺（TEHDGA）-十二烷-异癸醇（在不存在和存在胶束聚集体的情况下）的混合特性，它被认为是一种有前途的系统用于通过常规溶剂萃取路线分离微量锕系元素。使用多种技术研究了 TEHDGA 和异癸醇之间相互作用的性质，包括密度和声速测量、紫外吸收光谱和计算研究。发现 TEHDGA-异癸醇相互作用优于异癸醇间相互作用。在用硝酸平衡有机相时，获得了一些预胶束聚集的迹象。表明添加异癸醇后胶束聚集体尺寸增加。