Scanning electron micrograph of macroporous pDCPD γFe2O3/Fe3O4 nanocomposite foam obtained via ring opening metathesis polymerisation (ROMP) of high internal phase emulsion. The FeOx-NP composite ROMP foams are magnetic and can be attracted to a permanent magnet. Moreover, when subjected to an alternating magnetic field can be inductively heated. More details are presented by Sebastijan Kovačič et al, p 208.