Inventors:
Andrew M. Homola - San Jose CA
Sondra L. Rice - San Jose CA
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
B01J 1300
Abstract:
A magnetic dispersion is prepared by adjusting the pH of a mixture containing magnetic particles to a value which results in a positive electrostatic charge on the particles, while a mixture containing colloidal silica particles at the same pH results in negative electrostatic charges on the silica particles. Combining these mixtures causes the silica particles to coat and irreversibly bond to the magnetic particles resulting in better dispersion and less aggregation of the magnetic particles.