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dc.contributor.authorÇağlar Duvarcı, Özlem
dc.contributor.authorÇiftçioğlu, Muhsin
dc.date.accessioned2017-05-29T08:39:00Z
dc.date.available2017-05-29T08:39:00Z
dc.date.issued2012-09
dc.identifier.citationÇağlar Duvarcı, Ö. and Çiftçioğlu, M. (2012). Preparation and characterization of nanocrystalline titania powders by sonochemical synthesis .Powder Technology, 228, 231-240. doi:10.1016/j.powtec.2012.05.022en_US
dc.identifier.issn0032-5910
dc.identifier.urihttp://dx.doi.org/10.1016/j.powtec.2012.05.022
dc.identifier.urihttp://hdl.handle.net/11147/5626
dc.description.abstractNanocrystalline mesoporous titania powders were synthesized by hydrolyzing titanium isopropoxide in ethanol-water mixtures which were ultrasonically treated without using any templates or chemicals. Titanium isopropoxide-ethanol mixture was added dropwise to a water-ethanol mixture placed in an ultrasonic bath. The properties of the sonochemically synthesized powder were compared with those of the powders prepared without ultrasonic treatment along with Degussa P-25 titania powder. The phase structure, crystallite size, surface area, particle size, powder density were determined and sintering behavior was analyzed in this work. The nanotitania powder prepared during ultrasonic induced hydrolysis (TiO 2-U) was determined to be formed from a mixture of anatase and brookite phases at 25°C. The brookite phase in nanotitania powder prepared without ultrasonic treatment (TiO 2-NoU) was detected at 70°C. The anatase-rutile phase transformation was completed in the 500-700°C range for both powders. The average crystallite sizes of the powders at 25°C were determined as 10 and 5nm for TiO 2-NoU and TiO 2-U, respectively. The surface area decreased from 238 to106m 2/g for TiO 2-NoU and from 287 to 82m 2/g for TiO 2-U when the calcination temperature was increased from 200 to 500°C. The evolution of the N 2 adsorption-desorption behavior with calcination temperature and the corresponding pore size distributions/volumes was attributed to the formation of closely packed submicron aggregates during powder synthesis and calcination. The sintering behavior was concluded to be controlled by 7-10nm crystallites and the submicron aggregates. The determination of the densification behavior of titania powders prepared by different methods with various levels of dopants may prove to be very useful for a better understanding of the phase/pore structure evolution which is crucial for a significant number of applications.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.isversionof10.1016/j.powtec.2012.05.022en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectNanocrystalline titaniaen_US
dc.subjectPrecipitationen_US
dc.subjectShrinkage curveen_US
dc.subjectSinteringen_US
dc.subjectUltrasonic treatmenten_US
dc.titlePreparation and characterization of nanocrystalline titania powders by sonochemical synthesisen_US
dc.typearticleen_US
dc.contributor.authorIDTR115874en_US
dc.contributor.authorIDTR11652en_US
dc.contributor.institutionauthorÇağlar Duvarcı, Özlem
dc.contributor.institutionauthorÇiftçioğlu, Muhsin
dc.relation.journalPowder Technologyen_US
dc.contributor.departmentİYTE, Mühendislik Fakültesi, Kimya Mühendisliği Bölümüen_US
dc.identifier.volume228en_US
dc.identifier.startpage231en_US
dc.identifier.endpage240en_US
dc.identifier.wosWOS:000307132300029
dc.identifier.scopusSCOPUS:2-s2.0-84863429270
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


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