板状粒子的耗尽诱导双轴双折射态
Depletion-induced biaxial nematic states of boardlike particles
摘要：
为了研究双轴向列液晶的稳定条件，我们研究了添加非吸附性理想稀释剂对胶体硬板状粒子相行为的影响。我们考虑到的存在下，通过引入一个有效的消耗之间的一对板状粒子的吸引力。在固定的耗尽逸度下，通过具有限制取向的平均场论确定稳定的液晶相。有趣的是，我们预测，稍微拉长板状颗粒的临界耗尽密度存在，其中系统经历了从各向同性液体的直接过渡到一个双轴晶相。因此，通过调整耗尽密度，一个简单的实验控制参数，人们可以稳定的状态，高双轴双折射阶，即使这些状态是不稳定的纯系统的板状粒子。
英文摘要：
With the aim of investigating the stability conditions of biaxial nematic liquid crystals, we study the effect of adding a non-adsorbing ideal depletant on the phase behavior of colloidal hard boardlike particles. We take into account the presence of the depletant by introducing an effective depletion attraction between a pair of boardlike particles. At fixed depletant fugacity, the stable liquid crystal phase is determined through a mean-field theory with restricted orientations. Interestingly, we predict that for slightly elongated boardlike particles a critical depletant density exists, where the system undergoes a direct transition from an isotropic liquid to a biaxial nematic phase. As a consequence, by tuning the depletant density, an easy experimental control parameter, one can stabilize states of high biaxial nematic order even when these states are unstable for pure systems of boardlike particles.
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