Why certain liquids have the liquid crystal properties?

摘要

The creation reasons of liquid crystal state have not explained up to now. This article is devoted for the elaboration a new solution of this problem. Author found the new calculation method of expression Σ(r_i)~2 which is a function of temperature, molecular weight and light wavelength. The Σ(r_i)~2 characterise the molecule of liquid and is connected with the distance polarizability tensor components α_(||1), α_(⊥1) by the formula. Σ(r_i)~2 = ( Z r_o)~(1/2) [(α_(||1))~(1/2)/2 + (α_(⊥1))~(1/2)]. For liquid crystal one can obtain two values of Σ(r_i)~2. First the Σ(r_i)~2_(T_o) for the transition temperature T_o the isotropic liquid state of liquid crystal and second Σ(r_i)~2_(T_c) for the transition temperature to the solid state of liquid Crystal. These quantities must to satisfy the relation Σ(r_i)~2_(T_o) < Σ(r_i)~2_(T_c) for all liquid crystals. If it is inversely the liquid does not posses the liquid crystal properties.