Journal ArticleDOI
Untersuchungen am Graphitoxid V. Über den Bildungsmechanismus des Graphitoxids
H. P. Boehm,M. Eckel,W. Scholz +2 more
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TLDR
The graphite oxide is not formed from graphite and agents which easily transfer oxygen unless the graphite is first oxidized to graphite salt CA− · 2 HA as mentioned in this paper.Abstract:
Graphitoxid entsteht aus Graphit und leicht Sauerstoff abgebenden Oxydationsmitteln nur dann, wenn der Graphit zuerst zum Graphitsalz (CA− · 2 HA) oxydiert wird. Die weitere Oxydation verlauft um so schneller und vollstandiger, je mehr Wasser die Oxydations-mischung enthalt, wobei jedoch eine kritische Konzentration, bei der die Graphitsalze zersetzt werden, nicht uberschritten werden darf. In konz. HClO4 gelingt auch die elektrochemische Oxydation zu Graphitoxid. Bei der Bildung von Graphitoxid geht nahezu kein Kohlenstoff verloren; das Netzwerk der Kohlenstoffatome in den Schichten des Graphitoxids enthalt keine Locher oder Fehlstellen.
Graphite oxide is not formed from graphite and agents which easily transfer oxygen unless the graphite is first oxidized to the graphite salt CA− · 2 HA. The more water there is in the oxidation mixture, the faster and the more completely graphite oxide is formed upon further oxidation. The water content must not, however, exceed a critical concentration, above which the graphite salts are decomposed. Electrochemical formation of graphite oxide is possible in conc. HClO4. Practically no carbon is lost in the preparation of graphite oxide. Therefore, there are no holes within the network of carbon atoms in the graphite oxide layers.read more
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Graphene and Graphene Oxide: Synthesis, Properties, and Applications
TL;DR: An overview of the synthesis, properties, and applications of graphene and related materials (primarily, graphite oxide and its colloidal suspensions and materials made from them), from a materials science perspective.
Journal ArticleDOI
Chemical methods for the production of graphenes.
Sungjin Park,Rodney S. Ruoff +1 more
TL;DR: The use of colloidal suspensions to produce new materials composed of graphene and chemically modified graphene is reviewed, which is both versatile and scalable, and is adaptable to a wide variety of applications.
Journal ArticleDOI
Enhanced mechanical properties of nanocomposites at low graphene content.
TL;DR: Graphene platelets significantly out-perform carbon nanotube additives in terms of mechanical properties enhancement, and may be related to their high specific surface area, enhanced nanofiller-matrix adhesion/interlocking arising from their wrinkled (rough) surface, as well as the two-dimensional geometry of graphene platelets.
Journal ArticleDOI
Palladium Nanoparticles on Graphite Oxide and Its Functionalized Graphene Derivatives as Highly Active Catalysts for the Suzuki−Miyaura Coupling Reaction
TL;DR: In contrast to the conventional Pd/C catalyst, graphite oxide and graphene-based catalysts gave much higher activities with turnover frequencies exceeding 39,000 h(-1), accompanied by very low palladium leaching (<1 ppm).
Journal ArticleDOI
Graphene oxide-assisted membranes: Fabrication and potential applications in desalination and water purification
TL;DR: In this paper, a review of different fabrication and modification strategies for various innovative graphene oxide-assisted desalination membranes, including freestanding GO membranes, GO-surface modified membranes and casted GO-incorporated membranes, is presented.
References
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Journal ArticleDOI
On the Atomic Weight of Graphite
Journal ArticleDOI
Untersuchungen über Graphitoxyd
Ulrich Hofmann,Ernst König +1 more
TL;DR: Aus der Ubereinstimmung der aus den Rontgendaten berechneten und unter Xylol bestimmten spezifischen Gewichte folgt, das bei getrockneten Graphitoxydpraparaten alle Bestandteile betrachtlicher Menge, die in der Analyse gefunden werden, mit Ausnahme der Asche vom Elementarkorper umschlossen Werden.
Journal ArticleDOI
Über die Säurenatur und die Methylierung von Graphitoxyd
Ulrich Hofmann,Rudolf Holst +1 more