Điều khiển kích thước các hạt nano sắt từ

• Ngôn ngữ: vie
• Ký hiệu phân loại: 620.5 Nanotechnology
• Thông tin xuất bản: Khoa học và Công nghệ các trường đại học kỹ thuật, 2013
• Mô tả vật lý: 20-26
• Bộ sưu tập: Metadata
• ID: 557369

Tóm tắt

The effects of temperature, stirring rate and surfactants on the size of precipitated magnetite nanoparticles were investigated. For all the samples, the X-ray diffraction patterns and the saturation magnetizations of about 80 emu g-1 confirm the formation of magnetite and the absence of any impurity other than magnetite. The experimental results show that the average particle size decreases and the particle size distribution narrows down with increasing temperature and stirring rate. The reduction in size becomes more significantly by the surfactants. With the presence of 1 percent wt. sodium dodecyl benzene sulfonate the magnetite particle diameter is reduced by a factor of 2. The obtained results also indicate that the particle size is determined by the nucleation and growth rate of the ferrihydrite precursor. The particle growth is mainly achieved by the diffusion of solutes from the solution.