Recent advances on nematic order reconstruction
published: Aug. 5, 2010, recorded: July 2010, views: 206
Report a problem or upload filesIf you have found a problem with this lecture or would like to send us extra material, articles, exercises, etc., please use our ticket system to describe your request and upload the data.
Enter your e-mail into the 'Cc' field, and we will keep you updated with your request's status.
Investigations on Pi-cell, a sandwich cell with the director rotating by 180°, are demonstrating the possibility to obtain nematic transitions between two textures with different topologies, for instance between an untwisted state and a Pi-twisted one. Fast topological changes can be observed by means of suitable electric fields or by micro/nano-confinement in the nematic bulk or close to a boundary surface. A strong frustration, in fact, as in the case of a strong local distortion, can induce transient and/or local biaxial states inside a nematic calamitic phase and the resultant nematic dynamics demands a full Landau-de Gennes Q-tensor description. In this work, we present Q-tensor numerical models capable to describe the nematic order dynamics in full details, comparing theoretical results with experiments. We will also discuss as nematic order reconstruction close to a boundary surface with strong or infinite anchoring conditions can provide transitions equivalent to anchoring breaking.
Download slides: clc2010_barberi_ranor_01.pdf (2.1 MB)
Download slides: clc2010_barberi_ranor_01.ppt (7.3 MB)
Link this pageWould you like to put a link to this lecture on your homepage?
Go ahead! Copy the HTML snippet !