Wu, D (reprint author), Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China.
This short paper investigates the small angle X-ray scattering (SAXS) characteristic of SiO2 colloid prepared by sol-gel process using tetraethoxysilane (TEOS) as precursor and C8H17 (C6H4) (EO) H-n (Tx, n = 4. 5, 6. 5, 10) as surfactant and NH4OH as catalyst. Based on SAXS analysis about the negative deviation from Porod's law and the correction of the deviation, the geometric structure of the colloidal particle including the colloidal core size distribution, the average thickness of the interface layer (shell) between the colloidal core and the dispersed medium and the colloidal particle (core + shell) size distribution are determined. This information is helpful for understanding the physical chemistry property of colloid.