Brand Helmut R, Pleiner Harald
Theoretische Physik III, Universität Bayreuth, 95440, Bayreuth, Germany.
Max-Planck-Institute for Polymer Research, POBox 3148, 55021, Mainz, Germany.
Eur Phys J E Soft Matter. 2017 Mar;40(3):34. doi: 10.1140/epje/i2017-11523-7. Epub 2017 Mar 27.
We investigate the influence of transient or permanent elasticity on liquid phases with octupolar (tetrahedral) order, a question that has never been addressed before. The focus will be on optically isotropic liquid phases with tetrahedral order including the T phase and the chiral T phase introduced by Fel. It turns out that the presence of both, a network as well as tetrahedral order can lead to the formation of chiral domains of both hands in an optically isotropic fluid due to a completely novel mechanism, thus providing a possible macroscopic explanation for recent experimental observations. We study in detail how elasticity influences the macroscopic dynamics of both, the T and the T phase. The simultaneous presence of a transient network as well as of octupolar order is shown to lead to completely new cross-coupling phenomena for optically isotropic systems including transient dissipative elastic strains due to temperature gradients.
我们研究了瞬态或永久弹性对具有八极（四面体）有序性的液相的影响，这是一个此前从未被探讨过的问题。重点将放在具有四面体有序性的光学各向同性液相上，包括费尔引入的T相和手性T相。结果表明，由于一种全新的机制，网络结构和四面体有序性的同时存在会导致光学各向同性流体中形成双手性畴，从而为近期的实验观测提供了一种可能的宏观解释。我们详细研究了弹性如何影响T相和T*相的宏观动力学。结果表明，瞬态网络和八极有序性的同时存在会导致光学各向同性系统出现全新的交叉耦合现象，包括由温度梯度引起的瞬态耗散弹性应变。
