{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360004233575192576.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1039/c3ce41561a"}},{"identifier":{"@type":"URI","@value":"http://pubs.rsc.org/en/content/articlepdf/2013/CE/C3CE41561A"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Preparation of water-dispersible TiO2 nanoparticles from titanium tetrachloride using urea hydrogen peroxide as an oxygen donor"}],"description":[{"notation":[{"@value":"TiO2 nanoparticles were prepared from titanium tetrachloride (TiCl4) in CH2Cl2 at 80 °C for 30 h, 42 h and 70 h using urea hydrogen peroxide (UHP) as an oxygen donor with a TiCl4 : UHP molar ratio of 1 : 2. The XRD patterns and Raman spectroscopy results showed that the products consisted of anatase TiO2. IR and solid-state 13C NMR with cross polarization and magic angle spinning techniques revealed the presence of urea. TEM observation revealed that the products prepared by the reactions for 30 and 42 h consisted of water-dispersible spheroid nanoparticles with a long axis of ~5 nm, while an aggregation of nanoparticles was evident upon reaction for 70 h. Thermogravimetry, inductively-coupled plasma emission spectrometry and CHN analysis showed that the amount of urea increases in the following order: TiO2_42h, TiO2_70h, TiO2_30h. The photocatalytic activity of the products dispersible in water (TiO2_30h and TiO2_42h) was estimated based on the degradation behaviour of methylene blue, and TiO2_42h showed higher photocatalytic activity than TiO2_30h. It is proposed that TiCl4 was directly oxidized by UHP to form anatase TiO2 in the early stage of the process."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004233575192587","@type":"Researcher","foaf:name":[{"@value":"Naoko Watanabe"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233575192198","@type":"Researcher","foaf:name":[{"@value":"Taichi Kaneko"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233575192332","@type":"Researcher","foaf:name":[{"@value":"Yuko 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Yanagida"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233575192199","@type":"Researcher","foaf:name":[{"@value":"Atsuo Yasumori"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004233575192452","@type":"Researcher","foaf:name":[{"@value":"Yoshiyuki Sugahara"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"14668033"}],"prism:publicationName":[{"@value":"CrystEngComm"}],"dc:publisher":[{"@value":"Royal Society of Chemistry 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