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Evolution of structural dimensions in mesoporous template precursor from hexagonal lyotropic liquid crystals
journal contribution
posted on 2020-01-01, 00:00 authored by Guang Wang, C J Garvey, Jane Zhang, Luke O'DellLuke O'Dell, A M Krause-Heuer, Maria ForsythMaria Forsyth, T A Darwish, S Miloš, Lingxue KongLingxue KongProducing nanopores from hexagonal lyotropic liquid crystals (LLCs) templates requires not only retaining phase morphology of the templates but also precisely controlling structural dimensions of unit cells. In this study, SAXS and 2H NMR are used to investigate dimensional evolutions of ternary systems consisting of polymerizable species, (ethylene glycol) diacrylate (PEGDA) and/or 2-hydroxyethyl methacrylate (HEMA), in a LLCs template of hexagonally packed cylinders formed from dodecyl trimethylammonium bromide (DTAB) and water. With the addition of those polymerizable species, the system rearranges into a new hexagonal system with a smaller aggregation number, smaller pores and a thicker pore wall thickness. The hexagonal system will coexist with an aqueous-rich phase containing isotropically distributed DTAB if sufficient PEGDA is applied but the single hexagonal system could be restored by partially replacing the PEGDA with HEMA. The mobility of DTAB molecules within the aggregates varies depending on monomer compositions. The changes in structural dimensions of the unit cells and phase behaviors after adding polymerizable monomers allow dimensional control of mesochannels and potentially enable the control of selectivity and robustness of polymerized nanomaterials via molecular design.
History
Journal
Journal of physics. Condensed matter : an Institute of Physics journalVolume
32Issue
7Article number
075101Pagination
1 - 11Publisher
IOP PublishingLocation
Amsterdam, The NetherlandsPublisher DOI
eISSN
1361-648XLanguage
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
Keywords
hexagonal lyotropic liquid crystalsstructural dimensionphase behaviortemplate methoddodecyl trimethylammonium bromideScience & TechnologyPhysical SciencesPhysics, Condensed MatterPhysicsGLYCOL) DIACRYLATE HYDROGELPOLYMER MEMBRANESPHASE-BEHAVIORX-RAYRETENTIONTRANSPORTDYNAMICSPORESCondensed Matter Physics
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