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dc.contributor.authorGreen, Alice
dc.contributor.authorChiang, Chang-Yang
dc.contributor.authorGreer, Heather Frances
dc.contributor.authorWaller, Ashleigh
dc.contributor.authorRuszin, Aron
dc.contributor.authorWebster, James
dc.contributor.authorNiu, Ziyin
dc.contributor.authorSelf, Katherine
dc.contributor.authorZhou, Wuzong
dc.date.accessioned2018-01-04T00:32:06Z
dc.date.available2018-01-04T00:32:06Z
dc.date.issued2017-02-01
dc.identifier.citationGreen , A , Chiang , C-Y , Greer , H F , Waller , A , Ruszin , A , Webster , J , Niu , Z , Self , K & Zhou , W 2017 , ' Growth mechanism of dendritic hematite via hydrolysis of ferricyanide ' , Crystal Growth & Design , vol. 17 , no. 2 , pp. 800-808 . https://doi.org/10.1021/acs.cgd.6b01655en
dc.identifier.issn1528-7483
dc.identifier.otherPURE: 248865936
dc.identifier.otherPURE UUID: c5c9ea4d-39f0-4d1f-b78a-9d2fe7a0ab91
dc.identifier.otherScopus: 85011372921
dc.identifier.otherORCID: /0000-0001-9752-7076/work/58054989
dc.identifier.otherWOS: 000393354100045
dc.identifier.urihttp://hdl.handle.net/10023/12421
dc.descriptionW.Z. thanks EPSRC for financial support to purchase the FEG SEM (EP/F019580/1).en
dc.description.abstractThe detailed process of the hydrolysis of ferricyanide into dendritic α-Fe2O3 (hematite) crystals with snowflake-like, feather-like and leaf-like morphologies has been investigated. [Fe(CN)6]3– anions were found to polymerize into large, disordered soft matter aggregates at an early stage. The nucleation of hematite crystals took place near the surface of these aggregates via further hydrolysis. After the crystals grew to a certain size, branches started to appear. When the concentration of ferricyanide was low (i.e. 2 mM to 3.8 mM), growth was preferentially along the six equivalent <112̅0> directions, resulting in a flat snowflake-like shape, while high concentrations (i.e. 9 mM to 500 mM) of ferricyanide led to the growth of selective directions along the <101̅1> zone axes, forming a feather-like or leaf-like morphology. Highly selective adsorption and surface hydrolysis of [Fe(CN)6]3– anions on α-Fe2O3 crystals was found to be a crucial process in the formation of these novel morphologies. It was found that the polymeri- sation of ferricyanide led to a reduction of pH value and that the formation of Fe2O3 increased pH value. The pH value of the solution at the point when the branches start to grow can significantly affect the distribution of Lewis acidic sites on different surfaces and, therefore, change the growth direction. The newly established mechanism is complementary to the classical theories of crystal growth.
dc.language.isoeng
dc.relation.ispartofCrystal Growth & Designen
dc.rightsCopyright © 2017 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1021/acs.cgd.6b01655en
dc.subjectQD Chemistryen
dc.subjectNDASen
dc.subject.lccQDen
dc.titleGrowth mechanism of dendritic hematite via hydrolysis of ferricyanideen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews.School of Chemistryen
dc.contributor.institutionUniversity of St Andrews.EaSTCHEMen
dc.identifier.doihttps://doi.org/10.1021/acs.cgd.6b01655
dc.description.statusPeer revieweden
dc.date.embargoedUntil2018-01-03
dc.identifier.urlhttp://pubs.acs.org/doi/suppl/10.1021/acs.cgd.6b01655en


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