ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Nanosize anatase TiO2 powders have been synthesized by hydrothermal synthesis by usingtechnical grade TiOSO4 as precursor and urea as precipitating agent. The initial pressure of the reactionsystem was set at 6 MPa. Stirring speed was fixed at 300r/min. The reaction system reacted at thetemperature ranged from 110 to 150ºC for holding 2hrs to 8hrs and the concentration of the precursor wasranged from 0.25M to1.5M. XRD patterns show that the synthesized powders are in the form of anatasephase. Calculated grain size is ranged from 6.7 to 8.9nm by Scherrer method from the line broadening ofthe (101) diffraction peak of anatase. The specific surface area of the powders synthesized under differentconditions is ranged from 124 to 240m2/g. The grain size of the powders increases with the increase of thereaction temperature, holding time and precursor concentration, respectively. The specific surface areadecreases with the increase of reaction temperature and holding time, and does not obviously change withthe change of precursor concentration when the concentration of the precursor is less than 1M. However,when the concentration is higher than 1M, the specific surface area will decrease quickly with the increaseof the precursor concentration. XRD and DSC-TG analysis shows that the synthesized anatase TiO2 willbegin to transform to rutile TiO2 at about 840ºC. When heated to 1000ºC for holding 1h, the anatasepowders will transform to rutile completely
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2017.pdf
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