| Summary: | 碩士 === 國立中正大學 === 化學工程研究所 === 91 === In order to study the effect of ultrasonic sprayer on synthesis of nano intermetallics materials, using combustion synthesis via ultrasonic sprayer. The liquid reactant was nebulization by ultrasonic sprayer and then went to react by combustion synthesis. The nano intermetallic materials (NiCo) were successfully prepared by ultrasonic sprayer combustion. The size of product was smaller (14.9±3.2nm) than the product of liquid phase combustion on hot plate (28±22.5nm). The same as particle size distribution variation. The particle size was quite uniform. It was observed that the particle size decrease with the pressure of ultrasonic sprayer increasing. As the temperature of reaction was decreasing, the particle size also was decreasing.
By using titanium sulfate as titanium source for combustion synthesis, in the synthesis reaction of titania and metal titanates. Because many metal titanates such as FeTiO3, Al2TiO5, PbTiO3, MnTiO3, Na2Ti3O7, Zn2TiO4 and MgTi2O5 were successfully prepared by combustion synthesis, it’s possible for titanium sulfate and nitric acid to substitute titanium nitrate in combustion synthesis. The prepared metal titanates materials have been examined using SEM, TEM and the particle size analyses. These analyses indicate the existence of a nano scale, for prepared metal titanates. The combustion will be more violent and completing with adding nitric acid from recorded combustion sequences and the gases FT-IR analyses. With adding nitric acid, the combustion temperature is increasing and the yield of iron titanate will be increasing. With adding nitric acid the reaction exhaust bulk gases that release heat off and make product fluffy, thus the particle size will be decreasing.
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