Determination of SiO_2 colloid core size by SAXS

摘要

A colloid is a suspension in which the dispersed phase (i.e. sol particle or colloidal particle) is so small (in nanoscale) that gravitational forces are negligible and interactions are dominated by short-range forces, such as van der Waals attraction and surface charges [1]. According to the physical chemistry theory of the colloidal core and an interface layer that wraps about the colloid core. The average size of the colloidal cores, denoted as D, is an important parameter of a colloid system, which can help one to understand the structure and the aggregating mechanism of the colloid. To the best of our knowledge, the determination of D remains unreported. In this short paper we try to determine D of SiO_2 colloid cores prepared by base-catalyzed hydrolysis and condensation of alkoxides in alcohol by small angle X-ray scattering (SAXS). The analysis was directly based on slit-smeared SAXS data.