Eur. Phys. J. B 10, 509-513 (1999)
https://doi.org/10.1007/s100510050880

Memory of silica aggregates dispersed in smectic liquid crystals: Effect of the interface properties

Research Institute for Solid State Physics and Optics, P.O.B. 49, 1525 Budapest, Hungary

Corresponding author: ^a jakli@power.szfki.kfki.hu

Received: 31 July 1998
Revised: 17 December 1998
Published online: 15 August 1999

Abstract

Previous studies on nematic liquid crystals containing silica particles indicated memory effects that might be due to hydrogen bonds between the individual silica particles. We made smectic liquid crystal dispersions containing silica particles with various surface properties. Using a neutron scattering technique we studied the interfacial surface effects on the structure of the silica aggregates, and on the smectic layer alignment. Our observations indicate that the stability of the memory correlates to the number of OH groups on the silica surfaces. The observations imply that, with fine-tuning of the OH content of the silica surfaces, various types of memory devices can be designed. We considered three different effects that can memorise the alignment of the liquid crystal. Measurements on tilted SmC phases indicate that surface effects become important only after repeated heating-cooling cycles, as the average size of the aggregates decrease.