سال انتشار: ۱۳۹۱
محل انتشار: اولین همایش ملی کاربرد نانوتکنولوژی در صنایع نفت و پتروشیمی
تعداد صفحات: ۳
Kourosh Motevalli – Applied Chemistry Department, Fundamental Sciences Faculty, Islamic Azad University, South Tehran Branch
Zahra Yaghoubi – Industrial Faculty, Islamic Azad University, South Tehran Branch, Tehran, Iran
The Main aim of this work is establishing a simple and effective processing route for the preparation of NaTaO3 nanopowder by combining conventional and well established ceramic processing techniques, such as the solid state synthesis of submicron sized powder [1-9] and subsequent efficient milling to nano-range in an agitator bead mill. The influences of the milling time and different rotation speeds of the agitator shaft were followed by measurements of the particle size and size distribution and specific surface area. The optimization of the process resulted in a successful preparation of NaTaO3 nanopowder. Furthermore, the nanopowder was isostatically pressed between 250 MPa and 740 MPa and its compaction-response diagram was constructed. In this research, We report the processing of NaTaO3 nanopowder by combining the solid state synthesis and subsequent milling in the agitator bead mill. The effect of different rotation speeds of the agitator shaft on the comminution process was followed by laser granulometry. The morphology and specific surface area of the powders were investigated by scanning electron microscopy and the N2 adsorption method, respectively. With the optimized milling parameters we obtained NaTaO3 nanoparticles with an average size of 25 nm and a narrow particle size distribution. The result is comparable to other processing techniques, such as solution-based chemical routes or mechanochemical synthesis, however, the presented method does not require any complicated processing and it can be easily upscaled to yield large quantities of the NaTaO3 nanopowder. Furthermore, the compaction behaviour of the obtained nanopowder was investigated, and a compaction-response diagram was constructed revealing good compactability of the powder. The green compacts, isostatically pressed at 740 MPa, had a relative density of 70% and a narrow pore size distribution with an average pore radius of 4 nm [1-9].