CD Bioparticles has developed a large selection of polystyrene micro- and nanoparticles. Polystyrene particles are prepared by using emulsion and emulsion-free polymerization process. Coated or conjugated particles are prepared either by passive adsorption or covalent coupling. Functionalized polystyrene nanoparticles and polystyrene particles can be applied for a variety of applications such as drug delivery materials, polystyrene latex particles www.cd-bioparticles.com/product/polystyrene-ps-list-219.html