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dc.contributor.authorAtakul Savrık, Sevdiye
dc.contributor.authorBalköse, Devrim
dc.contributor.authorÜlkü, Semra
dc.date.accessioned2017-03-17T07:47:35Z
dc.date.available2017-03-17T07:47:35Z
dc.date.issued2011-05
dc.identifier.citationSavrık, S.A., Balköse, D., and Ülkü, S. (2011). Synthesis of zinc borate by inverse emulsion technique for lubrication. Journal of Thermal Analysis and Calorimetry, 104(2), 605-612. doi:10.1007/s10973-010-1159-0en_US
dc.identifier.issn1388-6150
dc.identifier.urihttp://doi.org/10.1007/s10973-010-1159-0
dc.identifier.urihttp://hdl.handle.net/11147/5078
dc.description.abstractLubricating oil additives based on boron compounds are promising materials for lubrication due to their tribological advantages such as antiwear efficiency, good film strength, and high temperature resistance. This article deals with the preparation of zinc borate particles that are well dispersed and colloidally stabilized in mineral oil. This method starts with preparing two inverse emulsions (water-in-oil) with sorbitan monostearate (Span 60) as a surfactant, light neutral oil as a continuous phase, and the aqueous solutions of borax decahydrate (Na2B4O7·10H 2O) and zinc nitrate (Zn(NO3)2·6H 2O) as the dispersed phases. The produced particles were zinc borate crystals having both rod-like and spherical morphologies, and the diameters of spherical particles were changing between 20 and 30 nm. FTIR spectra of the obtained particles showed the characteristic peaks of trihedral borate (B(3)-O) and tetrahedral borate (B(4)-O) groups as well as the specific peaks of the sorbitan monostearate. TG showed 30.42% and 22.08% mass loss at 600 °C for the samples prepared by inverse emulsion and precipitation techniques, respectively. The endothermic peak at 50 °C is observed due to the melting of sorbitan monostearate and the heat of melting is evaluated as -3.50 J/g. Tribological studies revealed that sorbitan monostearate not only outperformed as a dispersing agent of inorganic particles, but also it proved to be an anti-wear agent. Zinc borate produced by precipitation decreased the wear scar diameter from 1.402 to 0.639 mm and the friction coefficient from 0.099 to 0.064. The inverse emulsion was effective in decreasing wear scar diameter and the friction coefficient by lowering them to 0.596 and 0.089 mm, respectively.en_US
dc.description.sponsorshipScientific and Technical Research Council of Turkey (105M358)en_US
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.relation.isversionof10.1007/s10973-010-1159-0en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectDehydrationen_US
dc.subjectInverse emulsionen_US
dc.subjectLubricationen_US
dc.subjectZinc borateen_US
dc.subjectBorate mineralsen_US
dc.titleSynthesis of zinc borate by inverse emulsion technique for lubricationen_US
dc.typearticleen_US
dc.contributor.iztechauthorAtakul Savrık, Sevdiye
dc.contributor.iztechauthorBalköse, Devrim
dc.contributor.iztechauthorÜlkü, Semra
dc.relation.journalJournal of Thermal Analysis and Calorimetryen_US
dc.contributor.departmentİYTE, Mühendislik Fakültesi, Kimya Mühendisliği Bölümüen_US
dc.identifier.volume104en_US
dc.identifier.issue2en_US
dc.identifier.startpage605en_US
dc.identifier.endpage612en_US
dc.identifier.wosWOS:000289564700024
dc.identifier.scopusSCOPUS:2-s2.0-79958294513
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


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