The various liquid-crystal phases (called mesophases together with plastic crystal phases) can be characterized by the type of ordering. One can distinguish positional order (whether molecules are arranged in any sort of ordered lattice) and orientational order (whether molecules are mostly pointing in the same direction).

The liquid crystal state is a distinct phase of matter observed between the crystalline (solid) and isotropic (liquid) states. There are many types of liquid crystal states, depending upon the amount

2021年8月25日 · When cooled, most liquids undergo a simple phase transition to an ordered crystalline solid, a relatively rigid substance that has a fixed shape and volume. In the phase diagrams for these liquids, there are no regions between the liquid and solid phases.

A liquid crystal is a thermodynamic stable phase characterized by anisotropy of properties without the existence of a three-dimensional crystal lattice, generally lying in the temperature range between the solid and isotropic liquid phase, hence the term mesophase. Liquid crystal materials are unique in their properties and uses.

Liquid crystal (LC) phases represent a unique state of matter characterized by both mobility and order on a molecular and at the supramolecular levels. This behaviour appears under given conditions, when phases with a characteristic order intermediate to that of a three dimensionally ordered solid and a completely

2018年10月1日 · Depending on the arrangement of the molecules in a mesophase, or its symmetry, liquid crystals are subdivided into nematics, cholesterics, smectics, and columnar mesophases. Molecular arrangements of these mesophases are depicted in Fig. 1. Fig. 1. Molecular arrangements in liquid crystalline mesophases.

2000年2月1日 · The liquid crystal phase possesses some of the characteristics of the order, evidenced by X-ray diffraction, found in crystalline solids (Fig. 1a) and some of the disorder, evidenced by ease of flow, existing in liquids. The molecules in liquid crystal phases diffuse much like the molecules in a liquid, but they maintain some degree of ...

2023年1月30日 · Properties of Liquid Crystals. Liquid Crystal Displays (LCDs) Nematic and Smectic Phases. Chiral phases; Contributors and Attributions; A true liquid is isotropic, meaning that its properties are uniform in all directions— the result of

What are Liquid Crystals? Liquid crystal materials generally have several common characteristics. Among these are a rod-like molecular structure, rigidness of the long axis, and strong dipoles and/or easily polarizable substituents. The distinguishing characteristic of the liquid crystalline state is the tendency of the molecules (mesogens) to ...

Liquid crystals consist of anisotropic molecules and show a degree of order between the crystal and the isotropic phase. The least ordered liquid crystal phase only exhibits a one-dimensional long range orientational order. This is the so-called nematic phase.