On the methods of determining material constants in ferroelectric smectic C* liquid crystals

H. Takezoe Tokyo Institute of Technology, Department of Textile and Polymeric Materials, O-okayama, Meguro-ku, Tokyo, 152, Japan

K. Kondo Tokyo Institute of Technology, Department of Textile and Polymeric Materials, O-okayama, Meguro-ku, Tokyo, 152, Japan; Hitachi Research Laboratory, Hitachi Ltd., 4026 Kuji-cho, Hitachi-shi, 319-12, Japan

K. Miyasato Tokyo Institute of Technology, Department of Textile and Polymeric Materials, O-okayama, Meguro-ku, Tokyo, 152, Japan

S. Abe Tokyo Institute of Technology, Department of Textile and Polymeric Materials, O-okayama, Meguro-ku, Tokyo, 152, Japan

T. Tsuchiya Tokyo Institute of Technology, Department of Textile and Polymeric Materials, O-okayama, Meguro-ku, Tokyo, 152, Japan

A. Fukuda Tokyo Institute of Technology, Department of Textile and Polymeric Materials, O-okayama, Meguro-ku, Tokyo, 152, Japan

E. Kuze Tokyo Institute of Technology, Department of Textile and Polymeric Materials, O-okayama, Meguro-ku, Tokyo, 152, Japan

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Abstract

The methods to determine the material constants in ferroelectric Sm C* are summarized. The material constants dealt with are (1) the transition temperature, (2) the tilt angle, (3) the helical pitch, (4) the refractive index, (5) the spontaneous polarization, (6) the critical field to unwind the helix, (7) the elastic constant and (8) the viscosity coefficient. Based on the results obtained for 2-methylbutyl p-(p-n-alkoxybenzylideneamino) cinnamates (nOBAMBC), the importance of using properly prepared monodomain cells of high quality is emphasized by comparing our results obtained using the cells without surface treatment with others using the cells treated unidrectionally.

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On the methods of determining material constants in ferroelectric smectic C* liquid crystals

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On the methods of determining material constants in ferroelectric smectic C* liquid crystals

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