近年来，液晶得到了高速的发展，因其特有的性质，被广泛地应用于显示、智能膜、生物检测等领域。深入地理解液晶相态性质和分子结构的关系有着非常重要的意义。本课题将基于已有的基础，进一步研究具有特殊分子结构和丰富相态的T型液晶分子，探索分子结构和相态性质的内在关系。以T型液晶分子层状－无序相，层状－相列相和层状－近晶相为模型体系，研究各向异性液晶的二维相变行为，揭示液晶分子方向涨落对相变行为的影响，并结合理论预测，深入理解液晶二维相变的内在本质。同时将进一步探讨T型液晶分子系统中层内二维相变对三维层间结构的影响，和层内二维结构在层与层之间的相互关联。本课题的研究将加深人们对分子结构与相态性质关系的理解以及液晶二维相变内在本质的认识。

The recent developments of liquid crystals and their applications in displays, functional films and biosensors are attributed to their unique phase properties; therefore, the studies of the dependence of the phase properties of liquid crystals on their molecular structures are important. The project will investigate the phase behaviors of a T-shaped liquid crystal with a rod-like hard core and a flexible side chain linked at the middle. The lamellar-isotropic, lamellar-nematic, lamellar-smectic phases of the T-shaped molecules serve as a model system to study the two-dimensional phase transitions of liquid crystals. Due to the director fluctuations of liquid crystals, their behaviors are different from that of isotropic crystals and anisotropic crystals. The results will be compared with theoretical prediction to get a better understanding. The study of the project will provide useful information on the relationship between molecular structures and phase properties and the behaviors of two-dimensional phase transitions of liquid crystals.