Coupled mutual diffusion in aqueous (ammonium monovanadate plus butyl-substituted sulfonated resorcinarene) solutions: An experimental and theoretical approach
Coupled mutual diffusion in aqueous (ammonium monovanadate plus butyl-substituted sulfonated resorcinarene) solutions: An experimental and theoretical approach
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DOI：
10.1016/j.jct.2021.106465
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发表时间：
2021-04-14
影响因子：
2.6
通讯作者：
Leaist, Derek G.
中科院分区：
文献类型：
--
作者：
Galindres, Diana M.;Eslava, Valeria J.;Leaist, Derek G.
采用泰勒色散法在 298.15 K 下测量了大环盐四钠 5,11,17,23-四磺酸亚甲基-2,8,14,20-四(丁基)间苯二酚[4]芳烃 (Na(4)BRA) 水溶液的二元相互扩散系数 (D)。通过数据外推获得的Na(4)BRA的极限扩散系数用于评估BRA(4-)离子的极限电导率和流体动力学半径。分析了磺化间苯二芳烃的流体动力学半径随烷基取代基长度的增加而变化。在本工作的第二部分中，通过测量 NH4VO3(1) + Na(4)BRA(2) 水溶液的表观三元互扩散系数，研究了一钒酸铵对 Na(4)BRA 水溶液扩散的影响。在二元 Na(4)BRA 水溶液（未添加 NH4VO3）中，BRA(4-) 离子以与较小且相对移动的 Na+ 抗衡离子相同的速度扩散，以保持电中性。随着NH4VO3浓度的升高，NH(4)BRA的主扩散系数下降到支持NH4VO3溶液中BRA(4-)离子的示踪扩散系数。 NH4VO3 和Na(4)BRA 的耦合扩散是显着的。特别是，Na(4)BRA 浓度梯度产生显着的 NH4VO3 逆流耦合流。 Nernst 方程用于提供 Na(4)BRA 和 NH(4)VO3 强耦合扩散的静电解释。 (C) 2021 年由爱思唯尔有限公司出版。
Binary mutual diffusion coefficients (D) of aqueous solutions of the macrocyclic salt tetrasodium 5,11,17,23-tetrakissulfonatemethylen-2,8,14,20-tetra(butyl)resorcin[4]arene (Na(4)BRA) have been measured at 298.15 K by the Taylor dispersion method. The limiting diffusion coefficient of Na(4)BRA obtained by extrapolation of the data is used to evaluate the limiting conductivity and hydrodynamic radius of the BRA(4-) ion. The change in the hydrodynamic radius of sulfonated resorcinarenes with increasing the length of alkyl substituents is analysed. In the second part of this work, the effect of ammonium monovanadate on the diffusion of aqueous Na(4)BRA was investigated by measuring apparent ternary mutual diffusion coefficients for aqueous NH4VO3(1) + Na(4)BRA(2) solutions. In binary aqueous Na(4)BRA solutions (no added NH4VO3), the BRA(4-) ions diffuse at the same speed as the smaller and relatively mobile Na+ counterions to maintain electroneutrality. As the NH4VO3 concentration is raised, the main diffusion coefficient of NH(4)BRA drops to the tracer diffusion coefficients of BRA(4-) ions in supporting NH4VO3 solutions. Coupled diffusion of NH4VO3 and Na(4)BRA is significant. In particular, Na(4)BRA concentration gradients produce significant counter-current coupled flows of NH4VO3. Nernst equations are used to provide an electrostatic interpretation of the strongly coupled diffusion of Na(4)BRA and NH(4)VO3. (C) 2021 Published by Elsevier Ltd.