Preparation of α-alumina nanoparticles with various shapes via hydrothermal phase transformation under supercritical water conditions

2nd International Conference on Competitive Materials and Technological Processes

Hakuta, Y.^1 ; Nagai, N.^2 ; Suzuki, Y.-H.^2 ; Kodaira, T.^1 ; Bando, K.K.^1 ; Takashima, H.^1 ; Mizukami, F.^1,2

National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki 305-8565, Japan^1

Kawaken Fine Chemicals Co., Ltd., 103-0012 Tokyo, Japan^2

关键词: Alumina particles;    Boehmite nanoparticles;    High thermal conductivity;    Industrial materials;    Industrial product;    Size and shape;    Supercritical water conditions;    Synthetic methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/47/1/012045/pdf
DOI  :  10.1088/1757-899X/47/1/012045

来源: IOP

【 摘 要 】

Alumina (Al2O3) fine particles are widely used as industrial materials including fillers for metal or plastics, paints, polisher, cosmetics and electric substrates, due to its high hardness, chemical stability, and high thermal conductivity. The performance of those industrial products is closely related to the particle size or shape of the alumina particles used, and thus a new synthetic method to control size, shape, and crystal structure of the aluminum oxide is desired for the improvement of the performance. Hydrothermal phase transformation using various aluminum compounds such as oxide, hydroxide, and salt as a staring material, is known as one of the synthetic methods for producing alumina fine particles; however, the influence about the size and shape of the starting aluminum compounds has been little mentioned, although they strongly affect the size and shape of the final products. In this study, we investigated the influence of the shape, size and crystal structure of the starting aluminum compounds on those of the products, and newly succeeded in the production of rod-like α-Al2O3nanoparticles from fibrous boehmite nanoparticles using hydrothermal phase transformation under supercritical water conditions.