Temperature dependence of multilayering at the free surface of ionic liquids probed by X-ray reflectivity measurements.
Temperature dependence of multilayering at the free surface of ionic liquids probed by X-ray reflectivity measurements.
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DOI：
10.1021/la200252z
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发表时间：
2011-05
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影响因子：
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通讯作者：
Naoya Nishi;T. Uruga;H. Tanida;T. Kakiuchi
中科院分区：
文献类型：
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作者：
Naoya Nishi;T. Uruga;H. Tanida;T. Kakiuchi
采用X射线反射率测量方法，研究了温度对离子液体双（壬基丁磺酰基）酰胺三辛基甲基铵（[TOMA（+）][C（4）C（4）N（-）]）和双（壬基丁磺酰基）酰胺三己基十四烷基鏻（[THTDP（+）][C（4）C（4）N（-）]）表面成层的影响. [TOMA（+）][C（4）C（4）N（-）]和[THTDP（+）][C（4）C（4）N（-）]都在表面形成多层膜。[TOMA（+）][C（4）C（4）N（-）]表面的多层膜结构随温度的变化很小，而[THTDP（+）][C（4）C（4）N（-）]表面的多层膜结构随温度的升高明显扩散.不同的温度依赖性似乎与最近报道的[TOMA（+）][C（4）C（4）N（-）]和[THTDP（+）][C（4）C（4）N（-）]在离子液体中的界面结构的超低速动力学的差异有关|水界面
The effect of the temperature on the surface layering of ionic liquids has been studied for two ionic liquids, trioctylmethylammonium bis(nonafluorobutanesulfonyl)amide([TOMA(+)][C(4)C(4)N(-)]) and trihexyltetradecylphosphonium bis(nonafluorobutanesulfonyl)amide ([THTDP(+)][C(4)C(4)N(-)]), using X-ray reflectivity measurements at 285, 300, and 315 K. Both [TOMA(+)][C(4)C(4)N(-)] and [THTDP(+)][C(4)C(4)N(-)] develop multilayers at the surface. The structure of the multilayers at the [TOMA(+)][C(4)C(4)N(-)] surface shows little temperature-dependent change, whereas that at the [THTDP(+)][C(4)C(4)N(-)] surface clearly becomes diffused with increasing temperature. The different temperature dependence seems to be related to the difference in the recently reported ultraslow dynamics of the interfacial structure of [TOMA(+)][C(4)C(4)N(-)] and [THTDP(+)][C(4)C(4)N(-)] at the ionic liquid|water interface.