Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals

Abstract Graphene oxide (GO) forms a well-aligned lyotropic liquid crystal (LC) phase in aqueous dispersions at relatively low concentrations. Under a remarkably wide range of shear rates, we report hitherto unobserved shear-induced polarized light image patterns, a Maltese cross combined with shear...

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Autores principales:	Jacek K. Wychowaniec, Maria Iliut, Bartłomiej Borek, Christopher Muryn, Oleksandr O. Mykhaylyk, Steve Edmondson, Aravind Vijayaraghavan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/f8abbffe3d0840b9a4345f73d5dfcfcd
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spelling	oai:doaj.org-article:f8abbffe3d0840b9a4345f73d5dfcfcd2021-12-02T14:40:26ZElastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals10.1038/s41699-020-00193-x2397-7132https://doaj.org/article/f8abbffe3d0840b9a4345f73d5dfcfcd2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41699-020-00193-xhttps://doaj.org/toc/2397-7132Abstract Graphene oxide (GO) forms a well-aligned lyotropic liquid crystal (LC) phase in aqueous dispersions at relatively low concentrations. Under a remarkably wide range of shear rates, we report hitherto unobserved shear-induced polarized light image patterns, a Maltese cross combined with shear banding, recorded in real time and in situ during rheological measurements. This is shown to be a result of elastic flow instabilities that manifest as a helical flow in alternating bands of left- and right-handed helices, arising from a combination of shear flow and Taylor-type vortex flow. The instability is observed for LCs formed from large aspect ratio GO particles owing to their unique viscoelastic properties, but not for smaller aspect ratio particles. This phenomenon coincides with rheopecty and anomalous small-angle X-ray scattering patterns under shear flow, which confirm the instabilities. The results presented here could lead to advanced control over macroscopic periodic alignment in technologically relevant dispersions of two-dimensional material particles.Jacek K. WychowaniecMaria IliutBartłomiej BorekChristopher MurynOleksandr O. MykhaylykSteve EdmondsonAravind VijayaraghavanNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ChemistryQD1-999ENnpj 2D Materials and Applications, Vol 5, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Chemistry QD1-999 Jacek K. Wychowaniec Maria Iliut Bartłomiej Borek Christopher Muryn Oleksandr O. Mykhaylyk Steve Edmondson Aravind Vijayaraghavan Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals
description	Abstract Graphene oxide (GO) forms a well-aligned lyotropic liquid crystal (LC) phase in aqueous dispersions at relatively low concentrations. Under a remarkably wide range of shear rates, we report hitherto unobserved shear-induced polarized light image patterns, a Maltese cross combined with shear banding, recorded in real time and in situ during rheological measurements. This is shown to be a result of elastic flow instabilities that manifest as a helical flow in alternating bands of left- and right-handed helices, arising from a combination of shear flow and Taylor-type vortex flow. The instability is observed for LCs formed from large aspect ratio GO particles owing to their unique viscoelastic properties, but not for smaller aspect ratio particles. This phenomenon coincides with rheopecty and anomalous small-angle X-ray scattering patterns under shear flow, which confirm the instabilities. The results presented here could lead to advanced control over macroscopic periodic alignment in technologically relevant dispersions of two-dimensional material particles.
format	article
author	Jacek K. Wychowaniec Maria Iliut Bartłomiej Borek Christopher Muryn Oleksandr O. Mykhaylyk Steve Edmondson Aravind Vijayaraghavan
author_facet	Jacek K. Wychowaniec Maria Iliut Bartłomiej Borek Christopher Muryn Oleksandr O. Mykhaylyk Steve Edmondson Aravind Vijayaraghavan
author_sort	Jacek K. Wychowaniec
title	Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals
title_short	Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals
title_full	Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals
title_fullStr	Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals
title_full_unstemmed	Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals
title_sort	elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f8abbffe3d0840b9a4345f73d5dfcfcd
work_keys_str_mv	AT jacekkwychowaniec elasticflowinstabilitiesandmacroscopictexturesingrapheneoxidelyotropicliquidcrystals AT mariailiut elasticflowinstabilitiesandmacroscopictexturesingrapheneoxidelyotropicliquidcrystals AT bartłomiejborek elasticflowinstabilitiesandmacroscopictexturesingrapheneoxidelyotropicliquidcrystals AT christophermuryn elasticflowinstabilitiesandmacroscopictexturesingrapheneoxidelyotropicliquidcrystals AT oleksandromykhaylyk elasticflowinstabilitiesandmacroscopictexturesingrapheneoxidelyotropicliquidcrystals AT steveedmondson elasticflowinstabilitiesandmacroscopictexturesingrapheneoxidelyotropicliquidcrystals AT aravindvijayaraghavan elasticflowinstabilitiesandmacroscopictexturesingrapheneoxidelyotropicliquidcrystals
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Elastic flow instabilities and macroscopic textures in graphene oxide lyotropic liquid crystals

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