14C/12C Variations of Samples Exposed in Air According to Carbon Structure and Air Temperature

Autor:	Ki Suk Sung, Wan Hong, Gyujun Park, Jung Hun Park
Rok vydání:	2013
Předmět:	Archeology Materials science Analytical chemistry chemistry.chemical_element Cold air Nanotechnology Carbon nanotube Redox law.invention chemistry law Air temperature General Earth and Planetary Sciences Pyrolytic carbon Carbon Accelerator mass spectrometry
Zdroj:	Radiocarbon. 55:593-598
ISSN:	1945-5755 0033-8222
Popis:	Various carbon structures, including carbon nanofilament (CNF), single-wall carbon nanotube (SWCNT), multi-wall carbon nanotube (MWCNT), and pyrolytic graphite sheet (PGS), were exposed in air to determine how they vary according to carbon structure and air temperature. CNF is the carbon structure used in accelerator mass spectrometry (AMS) radiocarbon dating (Santos et al. 2007). When CNF and MWCNT were exposed in cold air (3 or −18 °C) for longer than 6 hr, their 14C/12C ratio increased (>5 × 10–14). When heated in an oven (200 or 250 °C) for longer than 12 hr, their 14C/12C ratio decreased. However, when SWCNT and PGS were exposed in air cooled to 3 °C for 12 hr, their 14C/12C ratio did not increase. This phenomenon is very curious, and is useful for the development of a storage method for carbon samples made by reduction reactions of CO2.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d0eb3567e42628635485c0e5c5551eda https://doi.org/10.1017/s0033822200057738 Zobrazit plný text záznamu