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dc.contributor.author
Rodriguez-Palomo, Adrian
dc.contributor.author
Lutz-Bueno, Viviane
dc.contributor.author
Cao, Xiaobao
dc.contributor.author
Kadar, Roland
dc.contributor.author
Andersson, Martin
dc.contributor.author
Liebi, Marianne
dc.date.accessioned
2021-03-26T16:24:06Z
dc.date.available
2021-02-13T04:23:24Z
dc.date.available
2021-02-16T13:46:55Z
dc.date.available
2021-03-26T16:24:06Z
dc.date.issued
2021-02-18
dc.identifier.issn
1613-6810
dc.identifier.issn
1613-6829
dc.identifier.other
10.1002/smll.202006229
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/469337
dc.identifier.doi
10.3929/ethz-b-000469337
dc.description.abstract
Self-assembled materials such as lyotropic liquid crystals offer a wide variety of structures and applications by tuning the composition. Understanding materials behavior under flow and the induced alignment is wanted in order to tailor structure related properties. A method to visualize the structure and anisotropy of ordered systems in situ under dynamic conditions is presented where flow-induced nanostructural alignment in microfluidic channels is observed by scanning small angle X-ray scattering in hexagonal and lamellar self-assembled phases. In the hexagonal phase, the material in regions with high extensional flow exhibits orientation perpendicular to the flow and is oriented in the flow direction only in regions with a high enough shear rate. For the lamellar phase, a flow-induced morphological transition occurs from aligned lamellae toward multilamellar vesicles. However, the vesicles do not withstand the mechanical forces and break in extended lamellae in regions with high shear rates. This evolution of nanostructure with different shear rates can be correlated with a shear thinning viscosity curve with different slopes. The results demonstrate new fundamental knowledge about the structuring of liquid crystals under flow. The methodology widens the quantitative investigation of complex structures and identifies important mechanisms of reorientation and structural changes.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc/4.0/
dc.subject
lyotropic liquid crystals
en_US
dc.subject
microfluidics
en_US
dc.subject
nanostructures
en_US
dc.subject
rheology
en_US
dc.subject
scanning small angle X-ray scattering
en_US
dc.subject
self-assembly
en_US
dc.subject
X-ray imaging
en_US
dc.title
In Situ Visualization of the Structural Evolution and Alignment of Lyotropic Liquid Crystals in Confined Flow
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial 4.0 International
dc.date.published
2021-01-27
ethz.journal.title
Small
ethz.journal.volume
17
en_US
ethz.journal.issue
7
en_US
ethz.pages.start
2006229
en_US
ethz.size
10 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Weinheim
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2021-02-13T04:23:30Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-03-26T16:24:15Z
ethz.rosetta.lastUpdated
2021-03-26T16:24:15Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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