Effects of the pH of Initial Solution on Hydrothermally Synthesized TiO2 Nanoparticles
محل انتشار: ماهنامه بین المللی مهندسی، دوره: 25، شماره: 2
سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 837
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شناسه ملی سند علمی:
JR_IJE-25-2_014
تاریخ نمایه سازی: 17 خرداد 1393
چکیده مقاله:
In this paper, we focused on the effects of the pH of initial solution on the chemical composition, size and morphology of hydrothermally synthesized titanium dioxide nanoparticles. TiCl4 and NaOH were used as titanium source and precipitant, respectively. Chemical phase and structure of samples were determined by X-Ray Diffraction (XRD) analysis. Scanning Electron Microscopy (SEM) images were used for size and morphology evaluation of the resulting particles. Also, Simultaneous Thermal Analysis (STA) was used for evaluation of phase transformations during calcination process. Results indicated that increase in the initial pH of the solution leads to increase in crystallite size of hydrothermally obtained nanopowder, which is because of enhanced growth condition resulting from the increasing concentration of hydroxide groups in the solution. Particle sizes of the synthesized nanopowders were smaller than 100 nm and the average particle sizes decreased from 60 to 25 nm by increasing initial pH from 3 to 7. The results also showed that at initial pH=>9 the resulting synthesized nanopowders were in amorphous state and calcination at 700˚C led to sodium titanate.
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نویسندگان
m.r vaezi
Division of Advanced Materials, Materials and Energy Research Center (MERC), Iran, Karaj
n.a arefian
Division of Advanced Materials, Materials and Energy Research Center (MERC), Iran, Karaj
m Farzalipour Tabriz
Division of Advanced Materials, Materials and Energy Research Center (MERC), Iran, Karaj
a Esmaielzadeh Kandjani
Division of Advanced Materials, Materials and Energy Research Center (MERC), Iran, Karaj