Laser-heated microfurnace: gas analysis & graphite morphology

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dc.contributor.authorSmith, AMen_AU
dc.contributor.authorYang, Ben_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorMann, Men_AU
dc.date.accessioned2010-11-05T01:32:46Zen_AU
dc.date.available2010-11-05T01:32:46Zen_AU
dc.date.issued2009-06-04en_AU
dc.date.statistics2009-06-04en_AU
dc.description.abstractpreparing ultra-small graphite samples from CO2 at the ~5 μg of carbon level (Smith et al. 2006, 2007, 2008). Recent effort has focused on automation using a LABview interface, which has permitted feedback control of the catalyst temperature as the reaction proceeds and logging of reaction parameters. Additionally, an automatic system has been developed to control the temperature of the cold finger for trapping CO2 (–196°C), trapping H2O (–80°C) and releasing these gases (25°C) during sample transfer and during the reaction. We have utilized a quadrupole mass spectrometer to study the gas composition during the reaction, in order to better understand the underlying chemical reactions for such small samples and to better estimate the overall efficiency of the process. Early results show that all CO2 is converted to CO by reduction on the iron catalyst within a few minutes of applying laser power. The reaction pressure stabilizes after ~20 minutes; however, some CO is not converted to graphite. The cold trap temperature of –80°C is effective at trapping H2O so there is little CH4 production. We have trialled a number of different iron catalysts (Cerac -325, Sigma Aldrich -400 and 25 nm Fe nanopowder) as well as Fe2O3 (reduced in situ to Fe) and have studied the graphite morphology by scanning electron microscopy (SEM). There is a marked difference in morphology with catalyst type; however, each graphite performs well in the cesium sputter ion source of the ANTARES AMS facility. These developments allow us to systematically optimize the performance of the apparatus and to develop a second generation device.en_AU
dc.identifier.citationSmith, A. M., Yang, B., Hua, Q., & Mann, M. (2009). Laser-heated microfurnace: gas analysis & graphite morphology. Presentation to the 20th International Radiocarbon Conference, 31st May - 5th June 2009. Big Island, Hawaii: Kailua-Kona. In Radiocarbon, 52(2), 769-782. doi:10.1017/S0033822200045781en_AU
dc.identifier.conferenceenddate5 June 2009en_AU
dc.identifier.conferencename20th International Radiocarbon Conferenceen_AU
dc.identifier.conferenceplaceHawaii: Kailua-Konaen_AU
dc.identifier.conferencestartdate31 May 2009en_AU
dc.identifier.govdoc3022en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleRadiocarbonen_AU
dc.identifier.pagination769-782en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2823en_AU
dc.identifier.urihttps://doi.org/10.1017/S0033822200045781en_AU
dc.identifier.volume52en_AU
dc.language.isoenen_AU
dc.publisherCambridge University Pressen_AU
dc.publisher.placeCambridge University Pressen_AU
dc.subjectGraphiteen_AU
dc.subjectCarbonen_AU
dc.subjectGas analysisen_AU
dc.subjectMorphologyen_AU
dc.subjectFurnacesen_AU
dc.subjectLaser-radiation heatingen_AU
dc.titleLaser-heated microfurnace: gas analysis & graphite morphologyen_AU
dc.typeConference Abstracten_AU
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