Data from Hacettepe University Provide New Insights into Nanocrystals (Structural evolutions in Ti and TiO2 powders by ball milling and subsequent heat-treatments)
By a News Reporter-Staff News Editor at Nanotechnology Business Journal -- Fresh data on Nanocrystals are presented in a new report. According to news reporting from Ankara, Turkey, by VerticalNews journalists, research stated, "In this study, nanocrystalline Ti and TiO2 powders were synthesized by wet milling of Ti powder within water and reactive milling of Ti powder under oxygen atmosphere, respectively. The wet milling processes were performed at 300 rpm milling speed for different milling durations (6, 12, 24, and 48 h)."
The news correspondents obtained a quote from the research from Hacettepe University, "Subsequent heat-treatments of the as-milled powders were performed at 200-800 degrees C for 1 h in an air atmosphere. Structural characteristics of the as-milled and the heat-treated powders were investigated by X-ray diffraction (XRD). The crystallite size, lattice strain and lattice parameters of the powders were also calculated. It has been realized that during the wet milling process, elemental Ti powder undergoes an hcp to fcc polymorphic transformation, which is related to grain refinement and plastic strain. In addition, TiO2 powders are produced after heat-treatments at 600 and 800 degrees C. Reactive milling of the elemental Ti powder in pressurized oxygen atmosphere leads to nartocrystalline TiO2 powders with an average crystallite size of about 10 nm after 48 h milling time. The subsequent heat-treatments of the asmilled TiO2 powders results in the increase of the crystallite size up to 70-150 nm. In order to understand the thermal behavior of the as-milled powders, thermal analysis (DTA) and thermogravimetric analysis (TGA) were employed."
According to the news reporters, the research concluded: "The activation energy of the nanocrystalline TiO2 powders was determined by the Kissinger method is 128 +/- 3 kJ/mol."
For more information on this research see: Structural evolutions in Ti and TiO2 powders by ball milling and subsequent heat-treatments. Ceramics International, 2014;40(7):11123-11130. Ceramics International can be contacted at: Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England. (Elsevier - www.elsevier.com; Ceramics International - www.elsevier.com/wps/product/cws_home/405926)
Our news journalists report that additional information may be obtained by contacting B. Avar, Hacettepe University, Dept. of Engn Phys, SNTG Lab, TR-06800 Ankara, Turkey.
Keywords for this news article include: Ankara, Turkey, Eurasia, Nanotechnology, Nanocrystalline, Emerging Technologies
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