Regensburg 2007 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Poster II
DY 30.62: Poster
Thursday, March 29, 2007, 16:00–18:00, Poster D
Switching Behavior of Thermoreversible Nematic Gels — •Matthias Müller1, Andreas Timme2, Wolfgang Schöpf1, Günter Lattermann2, and Ingo Rehberg1 — 1Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth — 2Makromolekulare Chemie I, Universität Bayreuth, D-95440 Bayreuth
We investigated the physical properties of a thermoreversible (physical) gel consisting of a nematic liquid crystal mixed with an organogelator in the planar configuration. In our sample materials the temperature of the gel-sol transition lies above the clearing point of the liquid crystal. Therefore the director stays aligned, after the gel network has formed. The main interest of this study is the change in the switching behavior between the gel and the pure liquid crystalline material, when applying an electric field. As expected, we found an increase of the threshold voltage for the Fréedericksz transition due to the gel network. Beyond that we experienced hysteresis effects, the are induced by the gelator.