Predicting the size of salt-containing aqueous Na-AOT reverse micellar water-in-oil microemulsions with consideration for specific ion effects
Predicting the size of salt-containing aqueous Na-AOT reverse micellar water-in-oil microemulsions with consideration for specific ion effects
复制标题
考虑特定离子效应，预测含盐 Na-AOT 反胶束油包水微乳液的尺寸
DOI：
10.1016/j.jcis.2020.11.007
复制
发表时间：
2021
影响因子：
9.9
通讯作者：
Graeve, Olivia A.
中科院分区：
文献类型：
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作者：
Ridley, Robyn E.;Fathi-Kelly, Hoorshad;Kelly, James P.;Vasquez, Victor R.;Graeve, Olivia A.
反胶束溶液是一种水溶性稳定的体系，其中表面活性剂分子在连续的有机相中包围着水滴。在它们的许多应用中，它们可用于合成可控团聚的纳米颗粒。在这里，我们考虑的作用，具体的离子效应在反胶束尺寸reduction.ExperimentsDynamic光散射测量和Gouy-Chapman双电层模型相结合，研究水/AOT/异辛烷反胶束体系（wo= 10）。不同浓度的FeSO 4、Mg（NO3）2、CuCl 2、Al（NO3）3、Fe（NO3）3、Y（NO3）3、NaBH 4、ZrOCl 2和NH 4 OH的反胶束的溶剂动力学直径（D）与其计算的德拜屏蔽长度κ−1之间存在线性关系，随着D的降低和盐浓度（c）的增加而观察到。发现通过比较反胶束尺寸作为c-1/的函数的线性拟合2，我们确定了分子尺寸可以描述为德拜屏蔽长度、阳离子价态（z）和比阴离子水合半径（ran）的函数，其中D = 3.1zκ−1+bi，且bi与tran线性相关。我们的模型准确地预测了反胶束的大小与另外的一价，二价和三价盐的主要水解阳离子物种具有的电荷是等于阳离子的化合价。
HypothesisReverse micellar solutions are thermodynamically stable systems in which surfactant molecules surround water droplets within a continuous organic phase. Among their many applications, they can be used for the synthesis of nanoparticles of controlled agglomeration. Here, we consider the role specific ion effects play in reverse micelle size reduction.ExperimentsDynamic light scattering measurements and the Gouy-Chapman electrical double layer model were combined to study water/AOT/isooctane reverse micellar systems (wo= 10). Linear relationships between the solvodynamic diameter (D) of reverse micelles containing various concentrations of FeSO4, Mg(NO3)2, CuCl2, Al(NO3)3, Fe(NO3)3, Y(NO3)3, NaBH4, ZrOCl2, and NH4OH, and their calculated Debye screening lengths, κ−1, were observed with decreasingDand increasing salt concentration (c).FindingsBy comparing the linear fits for reverse micelle size as a function ofc−1/2, we determined the size can be described as a function of the Debye screening length, cation valency (z), and specific anion hydrated radius (ran), whereD= 3.1zκ−1+bi, andbiis linearly related toran. Our model accurately predicts reverse micelle sizes with the addition of monovalent, divalent, and trivalent salts for which the primary hydrolyzed cation species has a charge that is equal to the cation valency.