The effect of ozone on the structure and physicochemical properties of ultradisperse diamond and shungite nanocarbon elementsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A comparative study of the effect of ozonization on the physicochemical properties
of naturally and synthetically generated nanocarbon materials, shungite carbon (ShC) and
ultra disperse diamond (UDD) after special treatment in the form of monodisperse single
nanodiamond particulates (mdsn-D), that have a similar two-level structural pattern (hier -
archical system structure) and curved graphene shells or their fragments contribute to the formation of the structure and surface properties of both ShC and mdsn-D particles, was conducted.
The ozonization kinetics of ShC and mdsn-D showed their high catalytic activity during
ozone decomposition. Upon ozonization, the graphene shell is removed selectively from
the surface of the diamond core of mdsn-D, as shown by Fourier transform-infrared (FT-IR)
spectroscopy and derivatography data. A distinctive characteristic of ShC is a substantial
change in structural parameters upon ozonization: structural porosity increases and the size
of coherent scatter domains decreases in the direction perpendicular to graphene layers [as
shown by small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM),
and selected area electron diffraction (SAED) data], which agrees with adsorption experiments
that showed an increase in ultramicroporosity and mesoporosity upon ozonization of
ShC. The molecular probe technique was used to monitor changes in microporosity of ShC
and mdsn-D.