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室温离子液体[Emim][PF6]和[Bmim][PF6]压致相变的拉曼散射研究

DOI: 10.11858/gywlxb.2013.02.013, PP. 253-260

Keywords: 室温离子液体,拉曼光谱,相变,高压

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Abstract:

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。

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