| Popis: |
Due to the characteristics such as fine grain, large surface area, high surface free energy and serious insufficient of atomic coordinate, nanoTiO2 is easy to conglobated in solution and further affect its application seriously. The agglomerate mechanism of nanoTiO2 in solution was studied and the reason of agglomeration was analyzed. Experiments were conducted to research the influence law on dispersing stability of nanoTiO2 powder in water by factors of dispersant type, dispersant content and dispersing process of ultrasonic dispersing and high-speed stirring. The dispersing stability of nanoTiO2 powder in water is evaluated by combining gravity deposition method with electronic microscopy analysis. According to the research, dispersant type and dispersant mixing amount have great influence on the dispersing property of nanoTiO2 powder, and the inorganic dispersant sodium tripolyphosphate achieved better dispersing effect. Furthermore, ultrasonic dispersing and high-speed stirring can improve the dispersing stability of nanoTiO2 powder and after high-speed stirring at first and then ultrasonic dispersing, the dispersing effect of nanoTiO2 powder is much better. |
