Tunable Sieving of Ions Using Graphene Oxide: Swelling Peculiarities in Free-Standing and Confined States

被引：12
作者：
Eliseev, Andrei A. [1 ,2 ]
Gurianov, Konstantin E. [1 ]
Poyarkov, Andrei. A. [1 ]
Komkova, Maria A. [2 ]
Sadilov, Ilia S. [1 ]
Chumakov, Andrei P. [3 ]
Petukhov, Dmitrii I. [1 ,2 ]
机构：
[1] Lomonosov Moscow State Univ, Dept Mat Sci, Moscow 119991, Russia
[2] Lomonosov Moscow State Univ, Chem Dept, Moscow 119991, Russia
[3] ESRF European Synchrotron, F-38000 Grenoble, France
来源：
NANO LETTERS | 2023年 / 23卷 / 21期
基金：
俄罗斯科学基金会;
关键词：
graphene oxide; swelling; in operando study; X-ray diffraction; membranes; ion sieving; MEMBRANES; WATER; SEPARATION; GAS; PERMEATION; HYDRATION; MOLECULE;
D O I：
10.1021/acs.nanolett.3c02247
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The paper describes a comparative study of swelling processes in free-standing graphene oxide (GO) membranes and GO laminates encapsulated with epoxy glue. For free-standing graphene oxide membranes, a huge variation in d-spacing in the range of 8-12 & Aring; depending on the ambient humidity and from 12 to >30 & Aring; depending on the electrolyte type and its concentration was revealed using direct in situ and in operando XRD studies. Limited swelling at various humidity levels as well as in electrolyte solution with low constriction/expansion of epoxy-encapsulated GO is counterposed to that of free-standing graphene oxides. The swelling suppression was explained by both physical constriction and the intercalation of amines into GO laminates, which was proved by local EDX studies. This results in ion diffusivity variation for over 2 orders of magnitude in free-standing and constrained graphene oxide membranes and provides factual evidence for tunable sieving of ions with confined graphene oxides.
引用
收藏
页码：9719 / 9725
页数：7
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