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Ion-Exchange Processes between Surface Layer and Core of Reverse Micelles of NaAOT+Tergitol NP-4 during Evaporation Crystallization of KNO3
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-09-12 00:00:00 , DOI: 10.1021/acs.cgd.7b00718 Alexander I. Bulavchenko 1 , Darya I. Beketova 1 , Marina G. Demidova 1 , Tatyana Yu. Podlipskaya 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-09-12 00:00:00 , DOI: 10.1021/acs.cgd.7b00718 Alexander I. Bulavchenko 1 , Darya I. Beketova 1 , Marina G. Demidova 1 , Tatyana Yu. Podlipskaya 1
Affiliation
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Liquid extraction and microdroplet probing of the composition of reverse microemulsions (NaAOT+Tergitol NP-4, NaAOT, and Tergitol NP-4 in n-decane) with aqueous salt solutions (KNO3, NaNO3, and KNO3+NaNO3) were used to determine the distribution of Na+ and K+ between the surface layer and the micelle core in the processes of evaporation crystallization of KNO3 and NaNO3 salts. It is shown that, at high content of NaAOT, K+ cations in micelle core are virtually completely replaced by Na+ and no crystallization of KNO3 in NaAOT micelles is observed. At low content of NaAOT in mixed micelles and small solubilization capacity (less than 1 vol %) partial exchange takes place and crystallization of KNO3 begins from a mixture of KNO3+NaNO3 salts. During crystallization, micelle cores become depleted in potassium nitrate, which causes reverse exchange of K+ cations, associated with AOT–, for Na+ contained in the micelle core. As a result, mainly KNO3 crystallizes in mixed micelles.
中文翻译：
KNO 3蒸发结晶过程中NaAOT + Tergitol NP-4反向胶束表面层与核心之间的离子交换过程
用盐水溶液（KNO 3，NaNO 3和KNO 3 + NaNO 3）对反向微乳状液（NaAOT +甘露醇NP-4，NaAOT和Tergitol NP-4在正癸烷中）进行液体萃取和微滴探测。在KNO 3和NaNO 3盐的蒸发结晶过程中，用于确定Na +和K +在表面层和胶束核心之间的分布。结果表明，在高含量的NaAOT下，胶束核心中的K +阳离子几乎完全被Na +取代，并且没有KNO 3的结晶。在NaAOT胶束中观察到。在混合胶束中NaAOT含量低且溶解能力小（小于1％（体积））时，发生部分交换，并且KNO 3的结晶从KNO 3 + NaNO 3盐的混合物开始。期间结晶，胶束芯变得耗尽硝酸钾，这会导致的K逆交换+阳离子，与相关联的AOT - ，的Na +包含在胶束芯。结果，主要KNO 3在混合胶束中结晶。
更新日期：2017-09-12
中文翻译：
KNO 3蒸发结晶过程中NaAOT + Tergitol NP-4反向胶束表面层与核心之间的离子交换过程
用盐水溶液（KNO 3，NaNO 3和KNO 3 + NaNO 3）对反向微乳状液（NaAOT +甘露醇NP-4，NaAOT和Tergitol NP-4在正癸烷中）进行液体萃取和微滴探测。在KNO 3和NaNO 3盐的蒸发结晶过程中，用于确定Na +和K +在表面层和胶束核心之间的分布。结果表明，在高含量的NaAOT下，胶束核心中的K +阳离子几乎完全被Na +取代，并且没有KNO 3的结晶。在NaAOT胶束中观察到。在混合胶束中NaAOT含量低且溶解能力小（小于1％（体积））时，发生部分交换，并且KNO 3的结晶从KNO 3 + NaNO 3盐的混合物开始。期间结晶，胶束芯变得耗尽硝酸钾，这会导致的K逆交换+阳离子，与相关联的AOT - ，的Na +包含在胶束芯。结果，主要KNO 3在混合胶束中结晶。
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