TECHNICAL ASPECTS OF MEASUREMENT OF ELASTIC-CONSTANTS AND DIAMAGNETICANISOTROPY OF NEMATIC LIQUID-CRYSTALS

Authors
KEDZIERSKI J RASZEWSKI Z RUTKOWSKA J OPARA T ZIELINSKI J ZMIJA J DABROWSKI R
Citation
J. Kedzierski et al., TECHNICAL ASPECTS OF MEASUREMENT OF ELASTIC-CONSTANTS AND DIAMAGNETICANISOTROPY OF NEMATIC LIQUID-CRYSTALS, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 249, 1994, pp. 129-140
Citations number
18
Categorie Soggetti
Crystallography
Journal title
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals → ACNP
ISSN journal
1058725X
Volume
249
Year of publication
1994
Pages
129 - 140
Database
ISI
SICI code
1058-725X(1994)249:<129:TAOMOE>2.0.ZU;2-F
Abstract
We have measured the critical values of electric E(C) and magnetic H-C fields in different types of Freedericksz transitions for 4-trans-n-h exyl-cyclohexyl- isothiocyanatobenzene (6CHBT). Capacitive and optical methods have been employed to detect these transitions. In the case o f twist-type deformation we have proposed a new interference method fo r threshold fields determination. On the basis of these measurements d iamagnetic anisotropy Delta(chi) splay K-11, twist K-22 and bend K-33 elastic constants have been calculated for cells of various thickness, coated with different polyimides.