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METHOD FOR PREVENTING AGGLORMERATION OF CHARGED COLLOIDS WITHOUT LOSS OF SURFACE ACTIVITY

United States Patent Application

20150275048
A1
View the Complete Application at the US Patent & Trademark Office
Lawrence Livermore National Laboratory - Visit the Industrial Partnerships Office Website
A method for chemically stabilizing polishing slurries in aqueous suspension to prevent their agglomeration while maintaining their surface activity is disclosed. The method prevents the formation of irreversible particle agglomerates during drying and permits the subsequent re-suspension of dried particles with no impact on the particle size distribution. The stabilization method can be customized based on knowledge of the colloid surface charge at suspension pH conditions, addition of a charged species having like charge to the colloid at the suspension conditions, and control of the concentrations of the charged species and other ions in suspension.
Dylla-Spears, Rebecca (Dublin, CA), Feit, Michael (Livermore, CA), Miller, Phillip E. (Livermore, CA), Steele, William A. (Tracy, CA), Suratwala, Tayyab I. (Pleasanton, CA), Wong, Lana L. (Pleasanton, CA)
14/ 437,453
October 16, 2013
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT [0002] The United States Government has rights in this invention pursuant to Contract No. DE-AC52-07NA27344 between the United States Department of Energy and Lawrence Livermore National Security, LLC for the operation of Lawrence Livermore National Laboratory.