The
effect of pressure on soot particle nanostructure has been
investigated by Raman spectroscopy. For the first time soot samples
produced in a set of coflow methane–air laminar diffusion flames
stabilized in a high-pressure combustion chamber, and collected by
thermophoresis, have been analyzed to obtain chemical/structural information.
The first-order Raman spectra of soot particles collected at several
elevated pressures have been analyzed and compared. As a result, within
the investigated range of pressures, i.e., from 10 to 20 bar, our
measurements show that soot nanostructure does not depend on the pressure
conditions. Changes in soot nanostructure were only observed as a
function of flame residence time. The results herein presented are
particularly relevant by considering the importance of nanostructure
on the soot reactivity toward oxidation and on the fact that soot
from practical combustion devices is mostly produced at high pressure.
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