Strong acid-nonionic surfactant lyotropic liquid-crystalline mesophases as media for the synthesis of carbon quantum dots and highly proton conducting mesostructured silica thin films and monoliths

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dc.authorid0000-0002-1129-3246en_US
dc.authorid0000-0002-0386-589X
dc.authorid0000-0001-6562-236X
dc.contributor.authorOlutaş, Elif Berna
dc.contributor.authorBalcı, Fadime Mert
dc.contributor.authorDağ, Ömer
dc.date.accessioned2021-06-23T19:37:39Z
dc.date.available2021-06-23T19:37:39Z
dc.date.issued2015
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Kimya Bölümüen_US
dc.description.abstractLyotropic liquid-crystalline (LLC) materials are important in designing porous materials, and acids are as important in chemical synthesis. Combining these two important concepts will be highly beneficial to chemistry and material science. In this work, we show that a strong acid can be used as a solvent for the assembly of nonionic surfactants into various mesophases. Sulfuric acid (SA), 10-lauryl ether (C12E10), and a small amount of water form bicontinuous cubic (V-1), 2D-hexagonal (H-1), and micelle cubic (I-1) mesophases with increasing SA/mole ratio. A mixture of SA and C12E10 is fluidic but transforms to a highly ordered LLC mesophase by absorbing ambient water. The LLC mesophase displays high proton conductivity (1.5 to 19.0 mS/cm at room temperature) that increases with an increasing SA content up to 11 SA/C12E10 mole ratio, where the absorbed water is constant with respect to the SA amount but gradually increases from a 2.3 to 4.3 H2O/C12E10 mole ratio with increasing SA/C12E10 from 2 to 11, respectively. The mixture of SA and C12E10 slowly undergoes carbonization to produce carbon quantum dots (c-dots). The carbonization process can be controlled by simply controlling the water content of the media, and it can be almost halted by leaving the samples under ambient conditions, where the mixture slowly absorbs water to form photoluminescent c-dot-embedded mesophases. Over time the c-dots grow in size and increase in number, and the photoluminescence frequency gradually shifts to a lower frequency. The SA/C12E10 mesophase can also be used as a template to produce highly proton conducting mesostructured silica films and monoliths, as high as 19.3 mS/cm under ambient conditions. Aging the silica samples enhances the conductivity that can be even larger than for the LLC mesophase with the same amount of SA. The presence of silica has a positive effect on the proton conductivity of SA/C12E10 systems.en_US
dc.identifier.doi10.1021/acs.langmuir.5b02225
dc.identifier.endpage10271en_US
dc.identifier.issn0743-7463
dc.identifier.issue37en_US
dc.identifier.pmid26332603en_US
dc.identifier.scopus2-s2.0-84942134190en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage10265en_US
dc.identifier.urihttps://doi.org/10.1021/acs.langmuir.5b02225
dc.identifier.urihttps://hdl.handle.net/20.500.12491/8193
dc.identifier.volume31en_US
dc.identifier.wosWOS:000361935500019en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.institutionauthorOlutaş, Elif Berna
dc.language.isoenen_US
dc.publisherAmer Chemical Socen_US
dc.relation.ispartofLangmuiren_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectLyotropic Liquid Crystalen_US
dc.subjectCarbon Quantum Dots
dc.titleStrong acid-nonionic surfactant lyotropic liquid-crystalline mesophases as media for the synthesis of carbon quantum dots and highly proton conducting mesostructured silica thin films and monolithsen_US
dc.typeArticleen_US

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