Mobility of liquids intercalated into the interplane space of graphite oxide as revealed by a combination of F NMR, H NMR and EPR spin probe methods

A combination of 19 F and 1 H NMR with the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence was used to examine the mobility of liquids in the interplane space of graphite oxide (GO) for the first time. The proposed approach allows for the reduction of NMR signals from immobile hydrogen-containing gr...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2020-09, Vol.22 (35), p.19969-19974
Main Authors: Chumakova, Natalia A, Tkachev, Yaroslav V, Vorobiev, Andrey Kh, Rebrikova, Anastasya T, Korobov, Mikhail V
Format: Article
Language:English
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Summary:A combination of 19 F and 1 H NMR with the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence was used to examine the mobility of liquids in the interplane space of graphite oxide (GO) for the first time. The proposed approach allows for the reduction of NMR signals from immobile hydrogen-containing groups on the surface of GO and for monitoring of the molecular mobility of intercalated liquids. The mobile fractions of H 2 O, CH 3 CN and CF 3 CH 2 OH were detected inside the corresponding swollen GO samples. For H 2 O, the amount of mobile liquid showed a peculiar temperature dependence where a certain portion survived well below 273 K. The sensitivity of the proposed 1 H NMR + CPMG procedure is also compared to the sensitivity of the EPR nitroxide spin probe method. A combination of 19 F and 1 H NMR with the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence was used to examine the mobility of liquids in the interplane space of graphite oxide (GO) for the first time.
ISSN:1463-9076
1463-9084
DOI:10.1039/d0cp03773g