Synthesis and Optical Analysis of Ellipsoidal Hematite (α-Fe2O3) Colloidal Particles

• Main Authors: Ming-yi Liu, 劉明益
• Other Authors: Chi-chung Hua
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/90064517751926768957

碩士 === 國立中正大學 === 化學工程所 === 98 === The dispersion property and structural features of colloidal particles can be characterized by light scattering techniques. Previous studies of ellipsoidal colloidal particles lack complete light scattering characterizations. In this study, we describe the synthesis and optical analysis of ellipsoidal colloidal particles made of hematite. The ellipsoidal hematite particles were prepared by forced hydrolysis method, which disperse well in water after adding TMAH surfactant. The dynamics and structure of bare hematite particles and TMAH-stabilized hematite particles were investigated by dynamic light scattering (DLS), depolarized dynamic light scattering (DDLS), and static light scattering (SLS). The dispersity of the two types of colloidal particles can be characterized by DLS, giving the effective radius of particles. Compared with SEM results, the size and shape of the particles in solution state can be reasonably obtained by DDLS and SLS. Overall, we found that the SLS analysis using the ellipsoid form factor can best described the size and shape of the colloidal particles synthesized.