Picture of person typing on laptop with programming code visible on the laptop screen

World class computing and information science research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

Explore

The pumping phenomenon in smectic C* liquid crystals

Stewart, I.W. (2010) The pumping phenomenon in smectic C* liquid crystals. Liquid Crystals, 37 (6-7). pp. 799-809. ISSN 0267-8292

Full text not available in this repository. Request a copy from the Strathclyde author

Abstract

It is known from experiments that smectic C* liquid crystals arranged in a bookshelf geometry between two parallel glass plates can exhibit a pumping phenomenon under the application of an electric field when the lower plate is fixed and the upper plate is allowed the possibility of some movement. This phenomenon, which reflects a change in the cell thickness via mechanical vibrations of the top plate, is known to occur when the direction of an applied electric field is suddenly reversed. An elementary model is developed that describes some of the key features of this effect and is directly relevant to the observations reported in the literature. Two aspects are considered: first, the effect of a simple field reversal, and secondly, the frequency-induced effects of an alternating electric field. A steady increase in the cell thickness occurs under alternating fields and this reflects a pumping phenomenon as the director orientation couples to the flow.