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  • 03월 10일 13시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제105회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Ionic liquids in-vacuo

2010년 3월 27일 14시 54분 35초
목24B3심 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 15시 : 00분
Royal Society of Chemistry 심포지움
저자 및
Pete Licence
The University of Nottingham, United Kingdom
Ionic liquids are, in general, organic based salts with melting points below 100 °C. This lecture describes a series of completely new experiments that are only made possible because these liquids are composed entirely of ions and consequently have almost zero vapour pressure, i.e. they do not evaporate even under vacuum. We have recognised that this lack of volatility allows ionic liquids to be used in a whole range of analytical instruments that require high vacuum for their operation. We have obtained high quality X-ray photoelectron spectroscopy (XPS) data of the pure liquids as well as the liquids doped with simple metal salts. XPS provides information about the electronic structure of different elements within a compound and has sufficient sensitivity to distinguish between atoms of the same element situated in chemically distinct environments, (see fig, left). Under our analysis conditions, liquid RTILs emit a surprisingly good photoelectron flux; hence, excellent XPS data can be obtained in a very short collection time (> 5 mins). Furthermore, since the RTIL is electrically conducting, none of the problems associated with differential charging are encountered, and charge neutralisation is not required. RTILs appear to be very stable during exposure to the X-ray source, we have observed no evidence of either out-gassing, after initial pump-down, or beam damage to the sample. The lecture will also give an overview of other activities from our group including the investigation of spectroelectrochemistry at UHV (EC-XPS) and the determination of thermodynamic data, including (ΔHvap ), using more traditional surface techniques including temperature programmed desorption (TPS) and line of sight mass spectrometry (LOSMS).