Viscosity of Nematic Liquid Crystals

Contents:

Chapter 1: Concepts of the hydrodynamics of liquid crystals • Anisotropy of the viscosity coefficients of liquid crystals • Relationships of the processes of the shear flow of liquid crystals and rotation of the liquid crystal director

Chapter 2: Methods for measuring the viscosity of nematic liquid crystals • The shear flow method • Ultrasound methods of measuring the viscosity of nematic liquid crystal • The method of the rotating magnetic field • The methods associated with the examination of the dynamics of reorientation of the liquid crystal in the magnetic or electrical field • The method of light scattering on thermal fluctuations of the director of liquid crystals

Chapter 3: Theory of the temperature dependence of the viscosity of nematic liquid crystals • Activation mechanism • The free volume model • The Diogo-Martins theory • Calculation of the viscosity coefficient of nematic liquid crystals using the kinetic equation • Calculation of the internal friction and rotational viscosity coefficients by the method of the nonuniform statistical operator • Description of the viscosity of nematic liquid crystals by the molecular dynamics methods

Chapter 4: Dependence of the viscosity of nematic liquid crystals on temperature and pressure • Activation nature of the temperature dependence of rotational viscosity • Relationship of viscosity with molecular packing and free volume • Comparison of the experimental data with the results of the molecular-statistical approach to describing the viscosity of the nematic liquid crystal • Pressure dependence of the viscosity of nematic liquid crystals • Temperature dependence of dynamic viscosity and Mesovich and Leslie viscosity coefficients

Chapter 5: Effect of the molecular structure on the viscosity of nematic liquid crystals • Effect of the dimensions and form of the molecule and of its fragments on viscosity and its temperature depend • Effect of the polarity of the molecule and its fragments or  viscosity of liquid crystal substances

Chapter 6: Viscosity of mixtures of nematic liquid crystals • Viscosity of mixtures of mesogens • The viscosity of liquid crystal solutions of non-mesogenic compounds • Viscosity of mixtures of nematic liquid crystals with optically active additions • Viscosity of liquid crystal materials • Calculation of the viscosity of the developed materials • Approaches to the development of liquid crystal material for various applications from the viewpoint of their viscosity properties

References

Index