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Magnetic and fluorescent silica particles (sicastar®-M-CT-greenF and -redF) are produced by hydrolysis of orthosilicates and related compounds. They have a hydrophilic surface with terminal Si-OH-groups. The magnetic silica particles are available with red fluorescence (sicastar®-M-CT-redF, excitation: 569 nm, emission: 585 nm) and with green fluorescence (sicastar®-M-CT-greenF, excitation: 485 nm, emission: 510 nm). They consist of cluster-typed aggregates in the size range of 3 – 10 µm with a mean diameter of 6 microns.
The particles are delivered in aqueous suspension without any surfactants.