The University of Dublin | Trinity College -- Ollscoil Átha Cliath | Coláiste na Tríonóide
Trinity's Access to Research Archive
Home :: Log In :: Submit :: Alerts ::

TARA >
School of Physics >
Physics >
Physics (Scholarly Publications) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/35847

Title: Fractal Growth of a Conventional Calamitic Liquid Crystal
Author: CHAN, HO-KEI
Author's Homepage: http://people.tcd.ie/hchan
Keywords: Physics
Issue Date: 2004
Citation: Ingo Dierking, Ho-Kei Chan, Ferhat Culfaz & Simon McQuire, Fractal Growth of a Conventional Calamitic Liquid Crystal, Physical Review E, 70, 5, 2004, 051701-1 - 051701-8
Series/Report no.: Physical Review E
70
5
Abstract: We report observation of liquid crystal phase ordering via fractal growth aggregates for a calamitic, non-bent-core mesogen. Fractal growth of a conventional smectic-C (Sm-C) phase from the isotropic melt after a temperature quench was experimentally investigated with respect to time, cell gap, quench depth, and quench rate. The determined fractal dimensions relating to the area as well as the perimeter of the growing aggregates suggest a phase formation process via a percolation mechanism. Computer simulations of the phase ordering process give further evidence for percolation growth, qualitatively reproducing the observed textures and quantitatively leading to the same fractal dimensions. We propose a general model of fractal smectic liquid crystal growth, which accounts for all of the different systems observed so far, bent-core or “banana” phases as well as the observation of fractal phase ordering of a conventional Sm-C phase. The model is based on the “breaking” of the commonly observed growth anisotropy by strong in-layer molecular interactions. These are provided by hydrogen bonding in the Sm-C case discussed here and by steric interactions in the case of the bent-core phases discussed in previous publications.
Description: PUBLISHED
This paper presents a detailed comparison between simulated percolation clusters and the experimental fractal-like aggregates of a growing hydrogen-bonded liquid crystal phase. It presents strong evidence that the intriguing fractal growth behaviour observed for several liquid crystal phases is generally based on a percolation mechanism.
URI: http://dx.doi.org/10.1103/PhysRevE.70.051701
http://hdl.handle.net/2262/35847
Related links: http://pre.aps.org/abstract/PRE/v70/i5/e051701
Appears in Collections:Physics (Scholarly Publications)

Files in This Item:

File Description SizeFormat
Fractal growth.pdfPublished (publisher's copy) - Peer Reviewed109.26 kBAdobe PDFView/Open


This item is protected by original copyright


Please note: There is a known bug in some browsers that causes an error when a user tries to view large pdf file within the browser window. If you receive the message "The file is damaged and could not be repaired", please try one of the solutions linked below based on the browser you are using.

Items in TARA are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback