1. A method of performing a selective embolization, the method comprising: a) selecting a targeted tissue within a mammalian patient; and b) delivering to the targeted tissue one or more first particles, the first particles each comprising a core and a coating; wherein the first particle core comprises a first acrylic-based hydrogel polymer; and the first particle coating comprises a poly[bis(trifluoroethoxy)phosphazene] and/or a derivative thereof.