Abstract
1. 1. An air-driven electrophoretic ultracentrifuge designed for the investigation of the electrophoresis of colloidal systems in an ultracentrifugal field has been described. 2. 2. A graphical method for simultaneously determining the mobilities and sedimentation constants of colloidal particles from electrophoretic ultracentrifugal data has been developed. 3. 3. The electrophoretic mobilities of hydrous ferric oxide sols have been determined by the use of the electrophoretic ultracentrifuge. 4. 4. The particle size or sedimentation constant of hydrous ferric oxide sols increases with continuous exposure to the combined effect of an electrical and ultracentrifugal field. 5. 5. Low concentrations of potassium citrate lower the mobility of hydrous ferric oxide sols and increase their particle size and sedimentation constant.
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