TY - JOUR
T1 - Synthesis and investigation of reaction mechanisms of diamondoids produced using plasmas generated inside microcapillaries in supercritical xenon
AU - Oshima, Fumito
AU - Stauss, Sven
AU - Inose, Yoshifumi
AU - Terashima, Kazuo
PY - 2014/1
Y1 - 2014/1
N2 - We have synthesized diamondoids using dielectric barrier discharge microplasmas generated inside a microcapillary reactor in supercritical xenon. The plasmas were generated near the critical temperature (Tcrit=389: 75 K) and pressure (pcrit=5:84 MPa) of xenon in the ranges of T/Tcrit=0:9640: 983 and p/pcrit=0:9981: 026 under both batch-type and continuous flow conditions with gas flow rates of 0.01-0.5mLmin%1. Micro-Raman spectra of the synthesized particles showed features characteristic of diamondoids, while gas chromatography-mass spectrometry measurements revealed that diamondoids up to undecamantane were possibly synthesized. Further, the amount of obtained diamantane was greater than those obtained using previously reported diamondoid synthesis processes that involve plasmas in supercritical fluids. This increase is attributed to the higher solubility of the supercritical medium, i.e., xenon, and the higher efficiency of the microreactor. A detailed gas chromatography-mass spectrometry analysis showed that higher diamondoids grow in a stepwise manner via the alternate removal of hydrogen atoms and the addition of methyl groups.
AB - We have synthesized diamondoids using dielectric barrier discharge microplasmas generated inside a microcapillary reactor in supercritical xenon. The plasmas were generated near the critical temperature (Tcrit=389: 75 K) and pressure (pcrit=5:84 MPa) of xenon in the ranges of T/Tcrit=0:9640: 983 and p/pcrit=0:9981: 026 under both batch-type and continuous flow conditions with gas flow rates of 0.01-0.5mLmin%1. Micro-Raman spectra of the synthesized particles showed features characteristic of diamondoids, while gas chromatography-mass spectrometry measurements revealed that diamondoids up to undecamantane were possibly synthesized. Further, the amount of obtained diamantane was greater than those obtained using previously reported diamondoid synthesis processes that involve plasmas in supercritical fluids. This increase is attributed to the higher solubility of the supercritical medium, i.e., xenon, and the higher efficiency of the microreactor. A detailed gas chromatography-mass spectrometry analysis showed that higher diamondoids grow in a stepwise manner via the alternate removal of hydrogen atoms and the addition of methyl groups.
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U2 - 10.7567/JJAP.53.010214
DO - 10.7567/JJAP.53.010214
M3 - Article
AN - SCOPUS:84892380755
VL - 53
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 1
M1 - 010214
ER -