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Tunable sieving of small gas molecules using horizontal graphene oxide membrane

Authors
Lee, Seung EunJang, JidonKim, JongwoonWoo, Ju YeonSeo, SeunghwanJo, SunghwanKim, Ji-WeonJeon, Eun-SeokJung, YousungHan, Chang-Soo
Issue Date
1-9월-2020
Publisher
ELSEVIER
Keywords
Gas separation; Graphene oxide membrane; Nanochannel; Layered structure; Molecular sieving
Citation
JOURNAL OF MEMBRANE SCIENCE, v.610
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MEMBRANE SCIENCE
Volume
610
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/53207
DOI
10.1016/j.memsci.2020.118178
ISSN
0376-7388
Abstract
Graphene oxide membrane (GOM) has attracted extensive attraction as a molecular sieve for the separation of water, ions, and gases. However, angstrom-level control of the GOM interlayer spacing for separating the specific size of gas molecule is difficult and the vertical transport mechanism of molecules through the GOM is highly complex because of the existence of several possible pathways. Here we fabricated GOMs with different angstrom-scale interlayer spacing through heat treatment and made them allow horizontal entrance and transport of gas molecules. The GOMs with angstrom channels exhibited superior performance in permeance in horizontal mode and moderate selectivity for H-2/CO2 and He/CO2 by tuning the sieving size of the channels. Molecular dynamics (MD) sim-ulations reveal that the precisely controlled interlayer spacing plays a primary role as a molecular sieve indeed, but increased graphitic area, a result of heat treatment, also affects observed selectivity. Our results provide insight into the transport mechanism of gas molecules through GO nanochannel, which has not been accurately identified due to its complex behavior and suggest the possibility of studying nanochannels as effective vehicle for separating molecules precisely.
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공과대학 (기계공학부)
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