title: Effect of additives on electrokinetic properties of colloidal alumina suspension.
abstract: Additive interactions and their effects on electrokinetic properties of colloidal alumina suspension are presented in this study. Dibasic ammonium citrate (DAC), natural egg albumin, and octanol-2 are chosen as additives. The surface charge behavior of a 5% (w/v) colloidal alumina suspension in the presence of these additives has been studied in detail. The optimum dosage of DAC to have a stable suspension is found to be 3 mg/g of alumina whereas it is 105 and 164 mg/g of alumina for albumin and octanol-2, respectively. Albumin was found to be a better dispersant than DAC and interacts more strongly than DAC with the surface of alumina, while octanol-2 shows physisorbing characteristics. Turbidity measurements indicate that albumin and DAC interact. When the DAC : albumin molar ratio exceeds 10, the turbidity of the solution is higher than the turbidity of pure albumin, indicating the formation of complexes.
authors.affiliation: Regional Research Laboratory (CSIR), Bhubaneswar, 751013, India. saberip@yahoo.com
authors.forename: Sarama
authors.initials: S
authors.lastname: Bhattacharjee
authors.forename: Bimal P
authors.initials: BP
authors.lastname: Singh
authors.forename: Laxmidhar
authors.initials: L
authors.lastname: Besra
mesh_terms: D000418:Albumins / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry*; D019343:Citric Acid / Q000031:analogs & derivatives / Q000737:chemistry; D003102:Colloids / Q000737:chemistry; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009391:Nephelometry and Turbidimetry; D000442:Octanols / Q000737:chemistry; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D013535:Suspensions / Q000737:chemistry; D013816:Thermodynamics
chemical_list: D000418:Albumins; D003102:Colloids; D000442:Octanols; D000644:Quaternary Ammonium Compounds; D013535:Suspensions; D019343:Citric Acid; D000537:Aluminum Oxide