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US06916514B2 Cationic shelled particle 失效
阳离子壳粒

Cationic shelled particle
摘要:
The invention relates to a cationic shelled particle comprising a colloidal alumina core having a median diameter of between 20 and 2000 nm and a positive charge, a layer on the surface of said core particle having a negative charge and comprising particles of a median diameter of less than 30% of the median diameter of said core particle, and an outer layer of positive charge.
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