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.citation.epage10271en_US
dc.citation.issueNumber37en_US
dc.citation.spage10265en_US
dc.citation.volumeNumber31en_US
dc.contributor.authorOlutaş, E. B.en_US
dc.contributor.authorBalcı, F. M.en_US
dc.contributor.authorDag, Ö.en_US
dc.date.accessioned2016-02-08T09:38:40Z
dc.date.available2016-02-08T09:38:40Z
dc.date.issued2015en_US
dc.departmentDepartment of Chemistryen_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 (V1), 2Dhexagonal (H1), and micelle cubic (I1) mesophases with increasing SA/ C12E10 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.5b02225en_US
dc.identifier.eissn1520-5827
dc.identifier.issn0743-7463
dc.identifier.urihttp://hdl.handle.net/11693/20959
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/acs.langmuir.5b02225en_US
dc.source.titleLangmuiren_US
dc.subjectCarbon filmsen_US
dc.subjectCarbonizationen_US
dc.subjectConductive filmsen_US
dc.subjectCrystalline materialsen_US
dc.subjectMixturesen_US
dc.subjectNanocrystalsen_US
dc.subjectPorous materialsen_US
dc.subjectProton conductivityen_US
dc.subjectSemiconductor quantum dotsen_US
dc.subjectSilicaen_US
dc.subjectSurface active agentsen_US
dc.subjectAmbient conditionsen_US
dc.subjectCarbon quantum dotsen_US
dc.subjectCarbonization processen_US
dc.subjectLower frequenciesen_US
dc.subjectLyotropic liquid crystallineen_US
dc.subjectMesostructured silicaen_US
dc.subjectMesostructured silica filmsen_US
dc.subjectProton conductingen_US
dc.subjectNonionic surfactantsen_US
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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