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Gas‐phase Preparation of SO 3 ‐Graphite: Host‐Exchange and Exfoliation
Author(s) -
Feicht Patrick,
Breu Josef
Publication year - 2015
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201500168
Subject(s) - intercalation (chemistry) , exfoliation joint , materials science , graphite , trioxide , pulmonary surfactant , breakage , chemical engineering , shear force , chemistry , composite material , sulfur , chromatography , nanotechnology , organic chemistry , metallurgy , graphene , engineering
The reaction of sulfur trioxide with graphite via gas phase led to an intercalation of a double layer of sulfur trioxide with a basal spacing of 11.1 Å. The SO 3 ‐graphite was obtained atom‐efficient as a single phase product without the need of purification. The increased basal space should facilitate an exfoliation by rendering the tactoids more shear labile. A further weakening of the attractive forces within a stack was done by the replacement of sulfur trioxide with the surfactant perfluorobutanesulfonic acid leading to a basal spacing of 16.8 Å. The large basal spacings were also preserved in suspension and no defects were created. The mechanical exfoliation with ultrasound predominantly broke the platelets. A rotor‐stator device offering high shear forces was found to exfoliate the platelets more gently but there was still a good number of very small particles.