论文标题
扭曲弯曲列液晶中的非牛顿流变学
Non-Newtonian rheology in twist-bend nematic liquid crystals
论文作者
论文摘要
在这项工作中，我们提出了一个简单的定性模型，以描述扭曲弯曲列液晶的剪切流变行为。我们发现，在相对较低的剪切速率下，有效粘度随着剪切速率表现出所谓的剪切稀薄现象而降低。在中间剪切速率下，应力几乎与剪切速率（一种平稳）无关，并且在很大的剪切速率下进行了牛顿流变学。在我们的理论中，我们根据大尺度上与弯曲弯相相等的有效晶状体的粗粒剪切粘度系数来估计剪切速率的临界值。我们工作的结果与最近的实验研究一致。
In this work we present a simple qualitative model to describe shear rheological behavior of the twist-bend nematic liquid crystals. We find that at relatively low shear rate the effective viscosity decreases with the shear rate manifesting so-called shear-thinning phenomenon. At intermediate shear rate the stress is almost independent of the shear rate (a sort of plateau), and at large shear rate Newtonian rheology takes place. Within our theory we estimate the critical values of the shear rate in terms of coarse grained shear viscosity coefficients of the effective smectics equivalent to the twist-bend phase at large scales. The results of our work are in the agreement with recent experimental studies.
