Biomedical Engineering Reference
In-Depth Information
groups are decomposed with the formation of volatile products in
different temperature intervals. The temperature profiles of these
volatiles measured by TDMS could be considered as “the chemical
identifiers” of UDD both in the as-received forms and after chemical
modifications.
It was shown that the problem of unification of different UDD,
distinguished by the details of synthesis and extraction technologies,
can hardly be solved by additional acid purification. Such a
treatment does not remove entirely the difference in the initial
surface properties of different UDD. Moreover, the use of identical
“standard” procedure for the extraction of UDD from the detonation
carbon soot of different types does not lead to the necessary level
“of the unification” of the UDD surface chemistry. One can suggest
that the chemical activity of UDD is controlled by stable “hereditary”
features formed on the stage of detonation synthesis. These features
are not removed entirely by standard extraction procedure in the
UDD production. The modification of UDD surface by soft thermal
oxidation in air can be considered as the simple and effective method
of the unification of the chemical properties of UDD surface, at least
with respect to the oxygen-containing functional groups.
The studies of noble gases in UDD by means of TDMS allowed
clarifying some questions of cosmochemical relevance. In particular,
valuable information was obtained on the processes of trapping of
noble gases by nanodiamond grains in interstellar space and on the
mechanisms of noble gas release from these grains in the course of
the laboratory studies.
Acknowledgment
This work was funded in part by the Russian Federal Agency for
Science and Innovations, State Contract No. 02.523.12.3024 dated
August 06, 2009.
References
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Dokl.
, 611-613 (in Russian).
2. Greiner, N. R., Philips, D. S., Johnson, J. D., and Volk, F. (1988). Diamonds
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