Interfacial Structure and Partitioning of Nitrate Ions in Reverse Micelles
Interfacial Structure and Partitioning of Nitrate Ions in Reverse Micelles
复制标题
DOI：
10.1021/acs.jpca.8b09751
复制
发表时间：
2019-01-10
影响因子：
2.9
通讯作者：
Patterson, Joshua D.
中科院分区：
文献类型：
--
作者：
Blackshaw, K. Jacob;Varmecky, Meredith G.;Patterson, Joshua D.
用溶液中的反胶束(RMS)作为海雾气溶胶(SSA)粒子的替代物，研究了NO3-的界面性质。通过调节双(2-乙基己基)琥珀酸磺酸钠(AOT)均方根的大小，我们能够用红外光谱分离出NO3-界面的振动特征。界面NO_3~-在非对称伸展坐标(u(3))上的红外光谱发生蓝移，相对于NO_3~-在水溶液中有较小的峰分裂。这些观察结果与RM水溶液内部界面区域氢键可用性降低是一致的。我们证明了Rm内部的界面和核心区之间的NO3-的分配可以用界面和水NO3-光谱的线性组合来确定。通过对NO3-界面分配曲线的拟合，我们证明了一种确定RMS内掺杂离子物种定量界面亲和力(CHI(界面))的方法。
The interfacial properties of NO3- were investigated using reverse micelles (RMs) in solution as proxies for sea spray aerosol (SSA) particles. By tuning the size of bis(2-ethylhexyl) sulfosuccinate sodium salt (AOT) RMs doped with NO3- we are able to isolate the vibrational signature of interfacial NO3- using infrared spectroscopy. The infrared spectrum of interfacial NO3- along the asymmetric-stretch coordinate (u(3)) is blue-shifted and possesses smaller peak splitting relative to NO3- in aqueous solution. These observations are consistent with the reduced hydrogen bonding availability of the interfacial region within the RM aqueous interior. We show that the partitioning of NO3- between the interfacial and core regions of the RM interior can be determined using a linear combination of interfacial and aqueous NO3- spectra. By fitting the interfacial partitioning curve of NO3- we demonstrate a method of determining quantitative interfacial affinity (chi(Interface)) for ionic species doped within RMs.