室温离子液体[Emim][PF_6]和[Bmim][PF_6]压致相变的拉曼散射研究  

Pressure-Induced Phase Transition of [Emim][PF_6] and [Bmim][PF_6] Studied by Raman Scattering

作　　者：朱祥[1] 王永强[1] 王征[1] 程学瑞[1] 袁朝圣[1] 陈镇平[1] 苏磊[1] 

机构地区：[1]郑州轻工业学院高压科学与技术研究中心,河南郑州450002

出　　处：《高压物理学报》2013年第2期253-260,共8页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(21273206;51002144);河南省高等学校青年骨干教师资助计划(2010GGJS-110);河南省教育厅自然科学基金(2009A140009);郑州轻工业学院博士科研基金

摘　　要：室温条件下,采用拉曼光谱仪和四柱型金刚石压砧(DAC),对两种室温离子液体的压致相变进行了详细的研究。实验表明,对于常压下为固态的1-乙基-3-甲基咪唑六氟磷酸盐([Emim][PF6],C6H11F6N2P)离子液体,压力增加到约0.86GPa时,发生固-固相变;对于常压下为液态的1-丁基-3-甲基咪唑六氟磷酸盐([Bmim][PF6],C8H15F6N2P)离子液体,压力增加到约0.62GPa时,发生液-固相变,增加到约1.45GPa时,发生固-固相变。此外,还对[Bmim][PF6]加压后的卸压过程进行了详细分析,结果表明:离子液体[Bmim][PF6]在0～2GPa范围内的压致相变是可逆的。In-situ pressure-induced phase transition of ionic liquids [Emim][PF6 ] and [Bmim] [PF6 ] have been studied under high pressure and room temperature by using Raman spectroscopy and high- pressure diamond anvil cell （DAC） apparatus. With the increase of pressure, [Emim] [PF6] experi- ences the solid-solid phase transition at about 0.86 GPa,and [Bmim][-PF6] experiences the liquid-solid phase transition at about 0.62 GPa and the solid-solid phase transition at about 1.45 GPa. Further- more,the decrease of pressure of [Bmim] [PF6-] has also been discussed in details. Pressure-released Raman spectra shows that the phase transition of [Bmim][PF6] is reversible under pressure up to 2 GPa.

关 键 词：室温离子液体 拉曼光谱 相变 高压 

分 类 号：O521.2[理学—高压高温物理]