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Thermogravimetric analysis of superparamagnetic iron oxide magnetic nanoparticle (Fe3O4-MNP), silica-coated magnetic nanoparticle (SiO2-MNP), SiO2-MNP surface modified with 3-aminopropyltriethoxysilane (amine-derived SiO2-MNP), and tissue plasminogen activator (tPA) bound to SiO2-MNP (SiO2-MNP-tPA).
