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“Carboxyl functionalized glass spheres” means the glass beads with COOH groups. These glass will have some special optical effects if they mix with some polymers. If there are no glass beads with COOH groups, glass beads without COOH groups are also Ok for me.

Dear gentleman/lady: I’m a student in University of Akron. I want to buy some “carboxyl functionalized glass spheres” with 300nm diameter. I checked the some website, such as Duke and Bangs. It is pity that only the glass spheres above 3 microns (µm) are available. Can anyone give me some advice about “carboxyl functionalized glass spheres” with 300nm diameter? Thanks and best wishes to you! Best Regards