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Lifetime of dynamic heterogeneity in an ionic liquid system

등록일
2008년 8월 12일 11시 51분 36초
접수번호
1299
발표코드
31P127포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 <발표Ⅱ>
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
박상원, 정연준
서울대학교 화학부, Korea
We study the influence of ion shape asymmetry and charge distribution on dynamic heterogeneity in ionic liquids by the molecular dynamics simulations performed on two schematic models. At one model the charge of anions is locally distributed, while at the other the charge is delocalized. Ion asymmetry results in poor packing ability, which gives rise to a lower melting temperature. Reduced depth of the potential wells due to delocalized charge distribution and a polymorphic structure due to multiple geometry on ion pairing can result in slow dynamics and dynamic heterogeneity. Here, we find that the dynamics of the both models is faster than that of single-site charges from mean square displacement calculation, and that the both models display heterogeneous dynamics. Further, we investigate the lifetime of dynamic heterogeneity in these systems by calculating a three-time correlation function.

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