膜
蛭石
化学
水化能
表面电荷
电导率
盐度
海水
离子
化学工程
离子键合
空间电荷
纳米技术
化学物理
材料科学
复合材料
有机化学
地质学
物理化学
生物化学
海洋学
物理
量子力学
工程类
电子
作者
Yuanhao Liu,Xin Ding,Long Chen,Weiliang Tian,Xinru Xu,Kewei Zhang
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2023-03-30
卷期号:62 (14): 5400-5407
被引量:2
标识
DOI:10.1021/acs.inorgchem.2c04257
摘要
Aligned ion transport in the nanofluidic membrane is promising for efficient salinity-gradient energy conversion, while remaining rather challenging due to relatively inadequate mass transport and long-time durability. In this work, wet-chemically exfoliated and negatively charged vermiculite lamellas are readily restacked into free-standing membranes with massive arrays of nanochannels and a three-dimensional interface. The resulting vermiculite nanofluidic membranes possess excellent stability against harsh conditions including a wide pH range and high temperature and exhibit a different ion transport behavior from the macroscopic one due to the surface-charge-governed conductivity. The ionic conductivity is several orders of magnitude higher than that of the native solution at low concentrations. Moreover, the negatively charged lamellas create a space charge zone, making the nanofluidic membrane capable of coupling surface charge and space charge in confinement for salinity-gradient energy conversion from seawater and freshwater. Compared with other layered materials, the vermiculite-derived membranes have distinct advantages such as low cost, facile fabrication, and high stability. This work provides a new idea for designing nanofluidic membranes from phyllosilicate minerals, which offers opportunities for manufacturing nanofluidic devices.
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