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Fractal nematic colloids
Hashemi, S. M. (Author), Jagodič, Uroš (Author), Mozaffari, M. R. (Author), Ejtehadi, M. R. (Author), Muševič, Igor (Author), Ravnik, Miha (Author)

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Abstract
Fractals are remarkable examples of self-similarity where a structure or dynamic pattern is repeated over multiple spatial or time scales. However, little is known about how fractal stimuli such as fractal surfaces interact with their local environment if it exhibits order. Here we show geometry-induced formation of fractal defect states in Koch nematic colloids, exhibiting fractal self-similarity better than 90% over three orders of magnitude in the length scales, from micrometers to nanometres. We produce polymer Koch-shaped hollow colloidal prisms of three successive fractal iterations by direct laser writing, and characterize their coupling with the nematic by polarization microscopy and numerical modelling. Explicit generation of topological defect pairs is found, with the number of defects following exponential-law dependence and reaching few 100 already at fractal iteration four. This work demonstrates a route for generation of fractal topological defect states in responsive soft matter.

Language:English
Keywords:soft matter physics, colloidal particles, nematics, fractals, topology
Tipology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Year:2017
Publisher:Nature Publishing Group
Number of pages:str. 12106-1-14026-9
Numbering:Vol. 8
UDC:53
ISSN on article:2041-1723
DOI:10.1038/ncomms14026 This link opens in a new window
COBISS.SI-ID:30202663 This link opens in a new window
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Downloads:427
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Record is a part of a journal

Title:Nature communications
Publisher:Springer Nature
ISSN:2041-1723
COBISS.SI-ID:2315876 This link opens in a new window

Document is financed by a project

Funder:EC - European Commission
Funding Programme:FP7
Project no.:304040
Name:Channelfree liquid crystal microfluidics
Acronym:FREEFLUID

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:16.02.2018

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