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Synthesis of of TiO_2, Y_2O_3 micro nanospheres composite oxide and its near-infrared reflectance performance

Author: ZhuangJie
Tutor: YuXiBin
School: Shanghai Normal University
Course: Applied Chemistry
Keywords: Titanium Dioxide yttrium oxide sol-gel process homogeneous precipitation method ball milling method NIR reflectance
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 36
Quote: 0
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Abstract


In this paper, TiO2 precursor was prepared by sol-gel process with tetrabutyl titanate as raw material, then titanium oxide microspheres of different crystal forms were obtained from the precursor by different sintering temperatures. Y2O3 nanospheres were synthesized through homogeneous precipitation method, with Y（NO3）3, NaOH and urea as materials. TiO2-Y2O3 composite coating was obtained by ball milling method from the samples prepared. The composition, structure, morphology and reflectance properties of the samples were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, TG Dynamic Stability Controln （TG-DSC）, FE-scanning electronic microscope （FE-SEM）. Various factors and the preparing method on the sample morphology was investigated, also, the growth mechanism of the spheres was studied. The main contents are as follows:1.With sol-gel method and surfactants as auxiliary, TiO2 microspheres precursor of narrow dispersion were prepared, whose average diameter was 800nm. TiO2 microspheres were obtained by proper heat treating. The size and morphology does not change after heat treatment. By controlling the temperature of heat treating, titanium dioxide microspheres of anatase and rutile type can be obtained. XRD, TG-DSC and SEM have been employed to analyzed the construction of product, reflection properties of the sample was determined by UV-VIS-NIR-spectrometer.2.With homogeneous precipitation method, and surfactants as auxiliary, precursor of different diameter were prepared. Y2O3 nanospheres of different particle size were obtained by proper heat treating.The diameter is between 40nm and 250nm. The size and morphology does not change after heat treatment. XRD, TG-DSC, FE-SEM and TEM have been employed to analyzed the construction of products, reflection properties of the sample was determined by UV-VIS-NIR-spectrometer.3.Disperse TiO2 and Y2O3 prepared into water-borne or solvent acrylic resin respectively to carry coating experiments. The results show that the best filler for TiO2 coating is the microspheres obtained at 900℃for 2h, the best filler of Y2O3 coating is the Y2O3 nanospheres which particle size is 180nm.4.With TiO2 and Y2O3 as raw materials, Oily acrylic resin and hexamethylenetetramine as dispersant, TiO2-Y2O3 composite coating was obtained by ball milling method。The effect of the dopant ratio, ball/powder weight ratio, milling time and the dosage of aerogel were investigated. UV-VIS-NIR-spectrometer was employed for the reflection properties of the coatings prepared. The optimum condition for the preparation of TiO2-Y2O3 composite coating with best reflection properties was obtained, the preparation conditions follow the ratio with yttrium∶titanium =1:1, ball:paint=3:4, ball milling time for two hours.

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