In order to do the flocculation assay, we usually use kaolin suspension, in some papers it's said that the size of particles should be between 4-5 um, but I have access to two types of kaolin: kaolin being used as face masks etc., and industrial kaolin. The former is more precise in size and purity but I'm not sure whether this type of kaolin is somehow functionalized or went under any kinds of treatment or not...
Yes, there is a difference between the kaolin used in cosmetics and the industrial kaolin that is typically used in clay analysis. The kaolin used in cosmetics is often purified and tailored for skincare applications, where it is used as an active ingredient or as an aid in formulations, such as acting as a stabilizer or moisturizer, and its concentration can be high in some products. Meanwhile, industrial kaolin is mainly used in industrial applications, such as chemical reactions and clarification processes, and requires unique properties related to stability or charge introduction. Thus, each type has its own specific concentrations, uses, and conditions.
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