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In Situ Characterization of Dehydration during Ion Transport in Polymeric Nanochannels
Lu, Chenghai; Hu, Chengzhi; Ritt, Cody L.; Hua, Xin; Sun, Jingqiu; Xia, Hailun; Liu, Yingya; Li, Da-Wei; Ma, Baiwen; Elimelech, Menachem; Qu, Jiuhui
2021-09-08
Source PublicationJOURNAL OF THE AMERICAN CHEMICAL SOCIETY
ISSN0002-7863
Volume143Issue:35Pages:14242-14252
AbstractThe transport of hydrated ions across nanochannels is central to biological systems and membrane-based applications, yet little is known about their hydrated structure during transport due to the absence of in situ characterization techniques. Herein, we report experimentally resolved ion dehydration during transmembrane transport using modified in situ liquid ToF-SIMS in combination with MD simulations for a mechanistic reasoning. Notably, complete dehydration was not necessary for transport to occur across membranes with sub-nanometer pores. Partial shedding of water molecules from ion solvation shells, observed as a decrease in the average hydration number, allowed the alkali-metal ions studied here (lithium, sodium, and potassium) to permeate membranes with pores smaller than their solvated size. We find that ions generally cannot hold more than two water molecules during this sterically limited transport. In nanopores larger than the size of the solvation shell, we show that ionic mobility governs the ion hydration number distribution. Viscous effects, such as interactions with carboxyl groups inside the membrane, preferentially hinder the transport of the mono- and dihydrates. Our novel technique for studying ion solvation in situ represents a significant technological leap for the nanofluidics field and may enable important advances in ion separation, biosensing, and battery applications.
Department环境水质学国家重点实验室
WOS Research AreaChemistry, Multidisciplinary
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/45952
Collection环境水质学国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06520 USA
4.East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China
Recommended Citation
GB/T 7714
Lu, Chenghai,Hu, Chengzhi,Ritt, Cody L.,et al. In Situ Characterization of Dehydration during Ion Transport in Polymeric Nanochannels[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2021,143(35):14242-14252.
APA Lu, Chenghai.,Hu, Chengzhi.,Ritt, Cody L..,Hua, Xin.,Sun, Jingqiu.,...&Qu, Jiuhui.(2021).In Situ Characterization of Dehydration during Ion Transport in Polymeric Nanochannels.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,143(35),14242-14252.
MLA Lu, Chenghai,et al."In Situ Characterization of Dehydration during Ion Transport in Polymeric Nanochannels".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 143.35(2021):14242-14252.
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