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dc.contributor.authorGoh, Siew Wei
dc.contributor.authorN. Buckley, Alan
dc.contributor.authorGong, Bill
dc.contributor.authorWoods, Ronald
dc.contributor.authorN. Lamb, Robert
dc.contributor.authorFan, Liang-Jen
dc.contributor.authorYang, Yaw-wen
dc.date.accessioned2017-05-03T16:59:15Z
dc.date.available2017-05-03T16:59:15Z
dc.date.issued2008
dc.date.modified2009-10-30T04:43:55Z
dc.identifier.issn08926875
dc.identifier.doi10.1016/j.mineng.2008.03.014
dc.identifier.urihttp://hdl.handle.net/10072/26329
dc.description.abstractSurface spectroscopic characterisation of some Cu and Ag thiolate multilayers on metal and metal sulfide substrates was undertaken to establish unequivocally the composition and possible orientation of the multilayer species. This information was sought to attempt to explain the undiminished floatability of sulfide minerals observed for collector coverage exceeding a monolayer. The thiol collectors investigated were dithiophosphate and 2-mercaptobenzothiazole (MBT), and bulk CuMBT and AgMBT complexes were prepared for comparison with the corresponding multilayers. Surface optimised synchrotron X-ray photoelectron spectra and partial electron yield near-edge X-ray absorption fine structure (NEXAFS) spectra confirmed that the Cu dithiolate, detected by secondary ion mass spectroscopy (SIMS), was no more than a minor constituent of the corresponding multilayer. The photoelectron spectra for multilayer CuMBT and AgMBT were similar to those for the corresponding bulk complexes. NEXAFS spectroscopy detected some CuII in bulk CuMBT prepared from cupric ions but not cuprous. The SIMS data were consistent with multilayer patches or islands on top of a chemisorbed monolayer and hence continued exposure of the monolayer in the presence of the multilayer. For each multilayer investigated, the SIMS data provided no evidence to support a multinuclear cluster structure as is present in the corresponding bulk thiolate, but nor could they exclude such a possibility. Angle-dependent NEXAFS spectroscopy at the N K-edge confirmed that MBT monolayers were aligned and revealed that the metal thiolate multilayer was not aligned relative to the substrate, but might nevertheless have been ordered in a cluster structure. It was surmised that undiminished floatability of sulfide minerals with multilayer collector coverage could probably be attributed to the patch-wise nature of the multilayer.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeNetherlands
dc.publisher.urihttp://www.sciencedirect.com/science/journal/08926875
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom1026
dc.relation.ispartofpageto1037
dc.relation.ispartofissue12-14
dc.relation.ispartofjournalMinerals Engineering
dc.relation.ispartofvolume21
dc.rights.retentionY
dc.subject.fieldofresearchPhysical chemistry
dc.subject.fieldofresearchChemical engineering
dc.subject.fieldofresearchResources engineering and extractive metallurgy
dc.subject.fieldofresearchcode3406
dc.subject.fieldofresearchcode4004
dc.subject.fieldofresearchcode4019
dc.titleThiolate layers on metal sulfides characterised by XPS, ToF-SIMS and NEXAFS spectroscopy
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2008
gro.hasfulltextNo Full Text
gro.griffith.authorWoods, Ronald


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