Outline
- Abstract
- Keywords
- 1. Introduction
- 2. Experimental
- 3. Results and Discussion
- 4. Conclusions
- Acknowledgments
- References
رئوس مطالب
- چکیده
- کلید واژه ها
- 1. مقدمه
- 2. آزمایش ها
- 3. نتایج و بحث
- 4. نتیجه گیری
Abstract
Nano α-alumina particles were synthesized by a sol–gel method using aqueous solutions of aluminum isopropoxide and 0.5 M aluminum nitrate. 1/3-benzenedisulfonic acid disodium salt (SDBS) and sodium bis-2-ethylhexyl sulfosuccinate (Na(AOT)) were used as surfactant stabilizing agents. Solution was stirred for different periods (24, 36, 48 and 60 h) at 60 °C. The samples were then analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Introduction of surfactant stabilizing agents and different stirring times will affect the size and shape of particle formed and also the degree of aggregation. SDBS, however, produced better dispersion, finer particles and spherical shape nanoparticles, compared to Na(AOT). The finest particle size (20–30 nm) was obtained at 48 h stirring time with SDBS surfactant.
Conclusions
The sol–gel method was used for the synthesis of nano aAl2O3 from aluminum alkoxide complexes which were coupled with the presence of surface active agents, like Na(AOT) and SDBS. Selection and control of the precise stirring time together with surface active agents proved to be important in controlling the particles size, degree of aggregation and the particles shape. Nano a-Al2O3 was checked at 1200 8C, when the transformation was just completed. In comparison to Na(AOT), SDBS indicated a better dispersion and finer particles. Similarly, the shape of the nano a-alumina nanoparticles with SDBS was basically spherical. The micro structural observation showed that nanoscale a-Al2O3 powder with SDBS surfactant with 48 h stirring time was produced in the range of 20–30 nm.