Mobility of liquids intercalated into the interplane space of graphite oxide as revealed by a combination of 19F NMR, 1H NMR and EPR spin probe methods. Issue 35 (28th August 2020)

• Record Type: Journal Article
• Authors: Chumakova, Natalia A.; Tkachev, Yaroslav V.; Vorobiev, Andrey Kh.; Rebrikova, Anastasya T.; Korobov, Mikhail V.
• Is Part Of: Physical chemistry chemical physics. Volume 22:Issue 35(2020)
• Page Start: 19969
• Page End: 19974
• Publication Date: 2020-08-28
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d0cp03773g
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : 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. Abstract : 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 H2 O, CH3 CN and CF3 CH2 OH were detected inside the corresponding swollen GO samples. For H2 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.