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TEM images of (A) PU-trimethylol propane (TMP) magnetic composite nanoparticle (PTCP-20), (B) PU-castor oil (CO) magnetic composite nanoparticle (PCCP-20), (C) PU-MHHNA magnetic composite nanoparticle (PMCP-20), and (D) PU-DHHNA magnetic composite nanoparticle (PDCP-20).
