ИСТИНА

Graphite oxide (GO) is a non-stoichiometric derivative of graphite prepared by oxi-dation of pure graphite in acidic conditions. GO is a layered material consisting of monoa-tomic layers – graphene oxide planes – mainly formed by sp3-carbon atoms bonding to oxy-gen-containing groups – carboxyl, carbonyl, hydroxyl, epoxy, etc. Graphite oxide easily swells in polar liquids; swelling is accompanied by an increase in inter-plane distance from 5–7Å in the dry material to 30–50Å in the swollen state. Using differential scanning calo-rimetry it was found that liquids intercalated in between GO planes do not demonstrate phase transition “liquid-solid”; this means that properties of intercalated liquids differ from the properties of bulk liquids. The goal of this contribution is to study the molecular mobili-ty of acetonitrile in between oxidized graphene planes using spin probe technique, which has never been used before for this aim. We found out that two types of intercalated acetonitrile – liquid-like and solid-like –present simultaneously in between graphene planes; the substance with intermediate mobili-ty was not observed. The ratio of the amount of liquid-like and solid-like intercalated ace-tonitrile depends on temperature. Micro-viscosity of liquid-like phase was found to be higher than one of bulk acetonitrile; this property depends on the amount of the intercalated liquid. It could be assumed that liquid-like acetonitrile is localized in unoxidized regions of graph-ite oxide, whereas solid-like one is localized in oxidized regions.