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  The impact of colloidal surface-anchoring on the smectic A phase

Püschel-Schlotthauer, S., Meiwes Turrión, V., Hall, C. K., Mazza, M. G., & Schoen, M. (2017). The impact of colloidal surface-anchoring on the smectic A phase. Langmuir, 33(9), 2222-2234. doi:10.1021/acs.langmuir.6b03941.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-5F68-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1E66-C
Genre: Journal Article

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 Creators:
Püschel-Schlotthauer, Sergej, Author
Meiwes Turrión, Victor1, Author              
Hall, Carol K., Author
Mazza, Marco G.1, Author              
Schoen, Martin, Author
Affiliations:
1Group Non-equilibrium soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063308              

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 Abstract: Liquid-crystalline phases are known for their unique properties, i.e., the combination of fluidity and long range orientational and/or positional order. The presence of a colloidal particle gives rise to perturbations of this order locally. These perturbations are the origin of inter-colloidal forces driving the colloidal self-assembly in a directed manner. Hence, the understanding of these perturbations is the first step in understanding and controlling the self-assembly process. Here, we perform Monte Carlo simulations to investigate the perturbations of orientational and positional order in asmectic A phase caused by a spherical colloid. We model the host phase via an interaction potential that reproduces characteristic features of phase behavior, structure, dynamics, and elasticity [S. Püschel-Schlotthauer et al., J. Chem. Phys. 2016, 145, 164903]. For strong homeotropic anchoring conditions, we find a Saturn ring defect and an onion structure in the smectic A phase; the latter has never been reported for colloids so far. For strong planar anchoring conditions, we find Boojum defects that become elongated at low temperature, similar to what is observed in experiments. However, for weak planar anchoring conditions a double surface ring defect is exhibited in the smectic A phase.

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Language(s): eng - English
 Dates: 2017-02-062017-03-07
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.langmuir.6b03941
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Title: Langmuir
Source Genre: Journal
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Pages: - Volume / Issue: 33 (9) Sequence Number: - Start / End Page: 2222 - 2234 Identifier: ISSN: 0743-7463