Author : Gregor Posnjak
Publisher : Springer
ISBN 13 : 3319982613
Total Pages : 192 pages
Book Rating : 4.3/5 (199 download)
Book Synopsis Topological Formations in Chiral Nematic Droplets by : Gregor Posnjak
Download or read book Topological Formations in Chiral Nematic Droplets written by Gregor Posnjak and published by Springer. This book was released on 2018-09-06 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book Gregor Posnjak unravels the long-standing mystery of the internal director structure of chiral nematic droplets, which has been studied both experimentally and theoretically since the 1970s. To do so, he develops a new method for the reconstruction of director fields from a set of fluorescent confocal polarising microscopy images, which he augments with a simulated annealing algorithm. This allows the full reconstruction of 3D director fields, describing the ordering of the liquid crystal. The reconstruction procedure and its principles, which are applicable to other methods of studying vector fields, are explained in detail. The method is subsequently used to explore complex 3D structures in chiral nematic liquid crystal droplets with perpendicular surface anchoring. Twentyfour distinct states are identified and presented, including the layered structures of different symmetries and states with multiple topological point defects, separated by localized chiral structures. In closing, the book reports on the first observation of topological point defects with higher topological charges q = −2 and q = −3.