Collective Translational-Rotational Coupling Motion of Molecules in

Liquids and Solutions

 

 

Hiroyasu Nomura, Shinobu Koda and Tatsuro Matsuoka

 

 

Contents

 

I. Introduction                                                                                                                                                               108

II. Experimental                                                                                                                                                           111

@1. Light Beating Scattering Measurements                                                                                                            111

@2. Ultrasonically Induced Birefringence Measurement                                                                                          113

III. Transnationaland Rotational Coupling Parameter R                                                                                         116

@1. Introduction                                                                                                                                                           116

@2. Theoretical Background                                                                                                                                       118

@3. Coupling between the Transnational and Rotational Motion of Molecules in

@@ Neat Liquid Crystals in Isotropic Phase                                                                                                            119

   1) Reorientational Relaxation Times ƒั                                                                                                                 119

   2) Coupling Parameter R of 5CB and MBBA                                                                                                     120

   3) Effects of Reorientational Relaxation Times and Coupling Parameter on

      Long Range Order of Isotropic Liquids                                                                                                           120

  4. Effects of Diluent on the Coupling Parameter R                                                                                              122

   1) Introduction                                                                                                                                                         122

   2) Diluent Effect on Phase Transition Temperature                                                                                            123

   3) Concentration Dependence of Reorientational Relaxation Time                                                                     124

   4) Concentration Dependence of Coupling Parameter R                                                                                    125

   5) MNR and Raman Scattering Measurements of 5CB-CCl 4 and TPP Systems                                            127

   6) Local Structure and Coupling Parameter                                                                                                        129

IV. Ultrasonically Induced Birefringence and Coupling Parameter R

    Theoretical Considerations                                                                                                                                     129

 1. Introduction                                                                                                                                                             129

 2. Theory                                                                                                                                                                     130

  1) Transport Equations                                                                                                                                            130

  2) Ultrasonically Induced Birefringence                                                                                                                 132

  3) Flow Birefringence                                                                                                                                               135

 APPENDIX: Comparison between irreversible statistical treatment and de Gennefs

   phenomenological one                                                                                                                                             135

V.Ultrasonically Induced Birefringence in Liquids

   and Solutions                                                                                                                                                           139

 1. Introduction                                                                                                                                                             139

 2. Modified Oka Theory of Rodlike Particles                                                                                                           140

 3. Ultrasonically Induced Birefringence in Isotropic Phase in Neat Liquid Crystal                                            142

 4. Frequency Dependence of Ultrasonically Induced Birefringence in Rod-like Particles                                   143

  1) Introduction                                                                                                                                                           143

  2) Birefringence of Rod-like Particles                                                                                                                      144

  3) Orientational Relaxation Times of Rod-like Particles                                                                                        147

 5. Ultrasonically Induced Birefringence in Rodlike Micelles in Entanglement Networks                                    148

  1) Introduction                                                                                                                                                          148

  2) Birefingence of Rodlike Micelles                                                                                                                         150

  3) Damped Oscillation Behaviour of Transient Ultrasonically Induced

     Birefringence of the Rodlike Micelles                                                                                                                151

 6. Ultrasonically Induced Birefringence in Polymer Solutions                                                                               153

VI.General Conclusion and Scope                                                                                                                               156