Springer Theses

Topological Formations in Chiral Nematic Droplets

Authors: Posnjak, Gregor

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  • Nominated as an outstanding Ph.D. thesis by the Jožef Stefan Institute and the University of Ljubljana, Slovenia 
  • Reports the first observation of topological point defects with higher topological charges q = −2 and q = −3
  • Provides a detailed description of the augmented fluorescent confocal polarising microscopy method, together with concrete examples to make the experimental method readily reproducible 
  • Includes optical microscopy images of chiral nematic droplets and a detailed analysis of the director field structures for simpler recognition in experiments 
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  • ISBN 978-3-319-98261-8
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About this book

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. 

Table of contents (10 chapters)

Table of contents (10 chapters)
  • Introduction

    Pages 1-3

    Posnjak, Gregor

  • Liquid Crystals—An Overview

    Pages 5-27

    Posnjak, Gregor

  • Liquid Crystal Droplets

    Pages 29-39

    Posnjak, Gregor

  • Experimental Inspection of Director Fields

    Pages 41-51

    Posnjak, Gregor

  • Materials and Experimental Setup

    Pages 53-62

    Posnjak, Gregor

Buy this book

eBook n/a
  • ISBN 978-3-319-98261-8
  • Digitally watermarked, DRM-free
  • Included format: PDF, EPUB
  • ebooks can be used on all reading devices
Hardcover n/a
  • ISBN 978-3-319-98260-1
  • Free shipping for individuals worldwide
Softcover n/a
  • ISBN 978-3-030-07475-3
  • Free shipping for individuals worldwide
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Bibliographic Information

Bibliographic Information
Book Title
Topological Formations in Chiral Nematic Droplets
Authors
Series Title
Springer Theses
Copyright
2018
Publisher
Springer International Publishing
Copyright Holder
Springer Nature Switzerland AG
eBook ISBN
978-3-319-98261-8
DOI
10.1007/978-3-319-98261-8
Hardcover ISBN
978-3-319-98260-1
Softcover ISBN
978-3-030-07475-3
Series ISSN
2190-5053
Edition Number
1
Number of Pages
XIII, 186
Number of Illustrations
15 b/w illustrations, 112 illustrations in colour
Topics