Accuracy of Nematic Visco-Elastic Constant Measurement Using Rayleigh Scattered Light

概要

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We calculated the accuracy of the Frank elastic constants and Leslie's viscosity constants obtained by photon correlation spectroscopy of Rayleigh scattered light (PSRS) for 5CB. The visco-elastic ratio, K_i/η_i, can be determined with an error of less than 1%. The value of K_2 obtained by using electric-field-applied PSRS (EFPSRS) is accurate to within 2.5%. Although K_1/K_2 can be obtained to within 2.5% by parameter fitting, the measurement error of K_3/K_2 was more than 20%. To improve the accuracy with which K_3/K_2 can be determined, we developed a new method that uses EFPSRS to obtain an absolute value of K_3 directly. According to our simulation, this method reduced the measurement error of all of the elastic constants and the viscosity coefficients η_<splay>, η_<twist>, and η_<bend> to less than 5%. We also calculated the measurement error of Leslie's viscosity constants. The value of μ_2 can be determined with an error of less than 5%, while other viscosity constants have errors of more than 15%. Our error estimation can be applied to measurements of any other liquid crystals obtained by using PSRS.
社団法人応用物理学会の論文
1995-10-15