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首页> 外文期刊>Chemistry: A European journal >X-ray diffraction studies on mesophases of cetyl- and dodecyltrimethylammoniumbromide in liquid ammonia
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X-ray diffraction studies on mesophases of cetyl- and dodecyltrimethylammoniumbromide in liquid ammonia

机译：液氨中十六烷基和十二烷基三甲基溴化铵中间相的X射线衍射研究

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摘要

We have studied solutions of the surfactants cetyltrimethylammoniumbromide (CTAB) and dodecyltrimethylammoniumbromide (DTAB) in liquid ammonia with respect to the formation of lyotropic phases. For this purpose, a set-up for performing X-ray scattering experiments at temperatures up to 120degreesC on samples containing liquid ammonia has been developed. Both systems form hexagonal and monoclinic lyotropic phases above the dissolving temperature of the surfactant, thus representing the first examples for lyotropic phases in liquid ammonia, and for monoclinic phases in nonaqueous solvents. The phase diagrams of CTAB/liquid NH3 and DTAB/liquid NH3 show similarities to their respective aqueous systems. However, the regions of existence of monoclinic phases are much larger in the ammonia system, while the cubic phases, as observed in the water based systems, do not seem to exist. The liquid-crystalline phases found provide potentiality for preparing mesoporous, nitride-based solids. [References: 25]
机译：我们已经研究了液氮中表面活性剂十六烷基三甲基溴化铵（CTAB）和十二烷基三甲基溴化铵（DTAB）的溶液，以形成溶致相。为此目的，已经开发出了一种用于在高达120摄氏度的温度下对含有液氨的样品进行X射线散射实验的装置。两种体系都在表面活性剂的溶解温度之上形成六方和单斜晶的溶致相，因此代表了液氨中的液致相和在非水溶剂中的单斜相的第一个实例。 CTAB /液态NH3和DTAB /液态NH3的相图显示了与它们各自的水性体系的相似之处。但是，氨系统中单斜相的存在区域要大得多，而水基系统中所观察到的立方相似乎不存在。发现的液晶相为制备介孔的，基于氮化物的固体提供了潜力。 [参考：25]

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