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dc.contributor.authorLiu, Yang
dc.contributor.authorTeng, Wei
dc.contributor.authorChen, Gang
dc.contributor.authorZhao, Zaiwang
dc.contributor.authorZhang, Wei
dc.contributor.authorKong, Biao
dc.contributor.authorHozzein, Wael N
dc.contributor.authorAl-Khalaf, Areej Abdulkareem
dc.contributor.authorDeng, Yonghui
dc.contributor.authorZhao, Dongyuan
dc.date.accessioned2019-06-19T13:09:41Z
dc.date.available2019-06-19T13:09:41Z
dc.date.issued2018
dc.identifier.issn2041-6520
dc.identifier.doi10.1039/c8sc02967a
dc.identifier.urihttp://hdl.handle.net/10072/385684
dc.description.abstractAlumina materials have widely been used in industrial fields, such as catalysis and adsorption. However, due to the fast sol–gel process and complicated crystalline-phase transformation, the synthesis of alumina materials with both highly ordered mesostructures and crystallized frameworks remains a great challenge. Herein, we report a novel vesicle-aggregation-assembly strategy to prepare highly ordered mesoporous γ-alumina microspheres with unique shifted double-diamond networks for the first time, by using diblock copolymer poly(ethylene oxide)-b-poly(methyl methacrylate) (PEO-b-PMMA) as a template and aluminum isopropoxide as a precursor in a tetrahydrofuran (THF)/hydrochloric acid binary solvent. During the gradual evaporation of THF and H2O, the as-made Al3+-based gel/PEO-b-PMMA composites can be obtained through a co-assembly process based on the hydrogen bonding interaction between hydroxyl groups of alumina oligomers and PEO segments of the diblock copolymers. The formed composites exhibit a spherical morphology with a wide size distribution (diameter size 1–12 μm). Furthermore, these composite microspheres possess an inverse bicontinuous cubic mesostructure (double diamond, Pn[3 with combining macron]m) with Al3+-based gel buried in the PEO-b-PMMA matrix in the form of two intertwined but disconnected networks. After a simple calcination at 900 °C in air, the structure of the resultant mesoporous alumina changes to a relatively low symmetry (shifted double diamond, Fd[3 with combining macron]m), ascribed to the shifting of the two alumina networks due to loss of the templates. Meanwhile, the unit cell size of the alumina mesostructure decreases from ∼131 to ∼95 nm. The obtained ordered mesoporous alumina products retain the spherical morphology and possess ultra-large mesopores (∼72.8 nm), columnar frameworks composed of γ-alumina nanocrystalline particles (crystal size of ∼15 nm) and high thermal stability (up to 900 °C). As a support of Au nanoparticles, the formed Au/mesoporous γ-alumina composite catalysts have been used in the catalytic reduction of 4-nitrophenol with a high kinetic constant k of 0.0888 min−1, implying promising potential as a catalyst support.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherROYAL SOC CHEMISTRY
dc.relation.ispartofpagefrom7705
dc.relation.ispartofpageto7714
dc.relation.ispartofissue39
dc.relation.ispartofjournalCHEMICAL SCIENCE
dc.relation.ispartofvolume9
dc.subject.fieldofresearchChemical Sciences
dc.subject.fieldofresearchcode03
dc.titleA vesicle-aggregation-assembly approach to highly ordered mesoporous gamma-alumina microspheres with shifted double-diamond networks
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dc.description.versionAccepted Manuscript (AM)
gro.rights.copyright© 2018 Royal Society of Chemistry. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorZhao, Dongyuan


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