Apparent Non-Newtonian Behavior of Ionic Liquids,The Journal of Physical Chemistry B

当前位置： X-MOL 学术 › J. Phys. Chem. B › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Apparent Non-Newtonian Behavior of Ionic Liquids
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-03-19 , DOI: 10.1021/acs.jpcb.0c01760
Agnès Piednoir ₁ , Audrey Steinberger ₂ , Cécile Cottin-Bizonne ₁ , Catherine Barentin ₁

Affiliation

A significant viscosity variation with the shear rate has been observed for several ionic liquids in rheometry experiments above a critical shear rate. Depending on the liquid and the rheological conditions, both viscosity increase and decrease have been reported. So far, these variations have been interpreted as a signature of a non-Newtonian behavior. However, the measured critical shear rates are orders of magnitude below the ones predicted by numerical simulations. In this work, we perform new rheometry experiments with both ionic liquids and Newtonian liquids to elucidate this discrepancy. For these two types of liquids, both a viscosity decrease and increase have been measured depending on the geometry of the rheometer and the zero-shear viscosity of the liquid. We interpret the viscosity decrease as resulting from viscous heating, since the viscosity of the investigated liquids is also highly temperature-dependent, and the viscosity increase as resulting from the development of instabilities at high shear rates.

中文翻译：

离子液体的表观非牛顿行为

在流变学实验中，已观察到几种离子液体在临界剪切速率以上时粘度随剪切速率的变化很大。根据液体和流变条件，已经报道了粘度的增加和降低。到目前为止，这些变化已被解释为非牛顿行为的特征。但是，测得的临界剪切速率比数值模拟预测的临界剪切速率低几个数量级。在这项工作中，我们将对离子液体和牛顿液体进行新的流变学实验，以阐明这种差异。对于这两种类型的液体，已经根据流变仪的几何形状和液体的零剪切粘度测量了粘度的降低和增加。我们将粘度下降解释为由粘性加热引起的，

更新日期：2020-03-20

点击分享查看原文

点击收藏

阅读更多本刊最新论文