Reference : Measuring the Anisotropy in Interfacial Tension of Nematic Liquid Crystals
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/50220
Measuring the Anisotropy in Interfacial Tension of Nematic Liquid Crystals
English
Honaker, Lawrence [> >]
Sharma, Anjali mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)]
Schanen, Andy [> >]
Lagerwall, Jan mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)]
15-Jun-2021
Crystals
MDPI AG
11
6
Optical and Molecular Aspects of Liquid Crystals
687
Yes (verified by ORBilu)
2073-4352
[en] <jats:p>Liquid crystal (LC) phases typically show anisotropic alignment-dependent properties, such as viscosity and dielectric permittivity, so it stands to reason that LCs also have anisotropic interfacial tensions. Measuring the interfacial tension ? of an LC with conventional methods, such as pendant drops, can be challenging, however, especially when we need to know ? for different LC aligning conditions, as is the case when we seek ??, the interfacial tension anisotropy. Here, we present measurements of ?? of the common synthetic nematic LC compound 5CB against water using a microfluidic droplet aspiration technique. To ensure tangential and normal alignment, respectively, we add poly(vinyl alcohol) (PVA) and sodium dodecylsulfate (SDS), respectively, as a stabilizer and measure ? for different concentrations of stabilizer. By fitting the Szyszkowski equation to the data, we can extrapolate to zero-stabilizer concentration, obtaining the ? of 5CB to pure water for each alignment. For normal alignment, we find ??=31.9?0.8 mN?m-1, on the order of 1 mN?m-1 greater than ?$_$=30.8?5 mN?m-1 for tangential alignment. This resonates with the empirical knowledge that 5CB aligns tangentially to an interface with pure water. The main uncertainty arises from the use of polymeric PVA as tangential-promoting stabilizer. Future improvements in accuracy may be expected if PVA can be replaced by a low molar mass stabilizer that ensures tangential alignment.</jats:p
European Commission - EC ; Fonds National de la Recherche - FnR
http://hdl.handle.net/10993/50220
10.3390/cryst11060687
H2020 ; 648763 - INTERACT - Intelligent Non-woven Textiles and Elastomeric Responsive materials by Advancing liquid Crystal Technology
FnR ; FNR9784104 > Lawrence William Honaker > LIMEFLOW > Liquid Metals Subject To Flow: From Fundamental Soft Matter Physics To Stretchable Electronics > 15/10/2015 > 14/10/2019 > 2015

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