Communication: Are hydrodynamic models suited for describing the reorientational dynamics of ions in ionic liquids? A case study of methylimidazolium tetra(hexafluoroisopropoxy)aluminates.
Communication: Are hydrodynamic models suited for describing the reorientational dynamics of ions in ionic liquids? A case study of methylimidazolium tetra(hexafluoroisopropoxy)aluminates.
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交流：流体动力学模型是否适合描述离子液体中离子的重新取向动力学？
DOI：
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发表时间：
2010
影响因子：
4.4
通讯作者：
H. Weingärtner
中科院分区：
文献类型：
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作者：
Mian;Safak Bulut;I. Krossing;H. Weingärtner
报道了六种以六氟异丙氧基铝酸盐（[Al（hfip）（4）]（-））为阴离子的同系离子液体的介电弛豫谱。在几百ps的时间尺度上，主模主要是由阳离子重取向引起的.由于粘度低，阳离子改性基本上不改变粘度，这些离子液体是测试旋转动力学的流体动力学模型的有趣的候选人。计算的流体动力学体积是非常低的，大致同意从文献数据计算的值与相同的阳离子，但不同的阴离子液体。与磁弛豫数据的比较表明，这些特性是在转动动力学中发现的，而不是介电弛豫所特有的。总的来说，这些观测结果强烈反对流体动力学方法对离子取向动力学的适用性。
We report on dielectric relaxation spectra of six homologous ionic liquids (ILs) with tetra(hexafluoroisopropoxy)aluminate ([Al(hfip)(4)](-)) as a common anion. The dominating mode on the time scale of several 100 ps mainly results from cation reorientation. Because the viscosities are low and cation modification does not substantially change the viscosity, these ILs are interesting candidates for testing hydrodynamic models of rotational dynamics. The calculated hydrodynamic volumes are extraordinarily low, and roughly agree with values calculated from literature data for ILs with the same cations, but different anions. Comparison with magnetic relaxation data shows that the peculiarities are founded in the rotational dynamics and are not special to dielectric relaxation. Collectively, the observations make a strong case against the applicability of hydrodynamic approaches to the orientational dynamics of ions.
影响因子：
15
作者：
Turton, David A.;Hunger, Johannes;Wynne, Klaas
通讯作者：
Wynne, Klaas