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Proceedings Paper

Evolution of large-scale structure during phase ordering in liquid crystals
Author(s): K. Diekmann; M. Schumacher; Horst Stegemeyer
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Paper Abstract

The phase ordering kinetics of various liquid crystalline systems turning from a disordered to an ordered phase induced by a rapid temperature quench was investigated. The process of phase ordering as evolution of large scale structure can be described by the growth of a characteristic length L. The exponents n of the universal growth law L(t) approximately tn have been determined. For the early stage of the phase ordering process we obtained values for n between 0.5 and 1 dependent on the depth of the temperatures quench. These results for mainly spherical shaped nematic and SB-germs are discussed in terms of the Allen-Cahn- theory for the movement of an antiphase boundary. 0.5 as a lower limiting value confirms the classical theory while 1 as an upper limiting value can be explained by the introduction of a volume driving force. The late stage was investigated in different Blue Phase systems. We obtained values for n between 0.1 and 0.2 dependent on the various systems but not dependent on the quench depth. The exponents lie distinctly below theoretically predicted values. The role of broken symmetry is discussed critically.

Paper Details

Date Published: 1 January 1998
PDF: 4 pages
Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); doi: 10.1117/12.301267
Show Author Affiliations
K. Diekmann, Univ. Paderborn (Germany)
M. Schumacher, Univ. Paderborn (Germany)
Horst Stegemeyer, Univ. Paderborn (Germany)

Published in SPIE Proceedings Vol. 3319:
Liquid Crystals: Chemistry and Structure
Marzena Tykarska; Roman S. Dabrowski; Jerzy Zielinski, Editor(s)

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