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Biocompatible Magnetic Micro‐ and Nanodevices: Fabrication of FePt Nanopropellers and Cell Transfection
Author(s) -
Kadiri Vincent Mauricio,
Bussi Claudio,
Holle Andrew W.,
Son Kwanghyo,
Kwon Hyunah,
Schütz Gisela,
Gutierrez Maximiliano G.,
Fischer Peer
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202001114
Subject(s) - materials science , nanotechnology , biocompatible material , remanence , transfection , magnetic nanoparticles , nanoparticle , magnet , neodymium magnet , ferromagnetism , magnetization , biomedical engineering , cell culture , magnetic field , medicine , physics , quantum mechanics , biology , genetics
The application of nanoparticles for drug or gene delivery promises benefits in the form of single‐cell‐specific therapeutic and diagnostic capabilities. Many methods of cell transfection rely on unspecific means to increase the transport of genetic material into cells. Targeted transport is in principle possible with magnetically propelled micromotors, which allow responsive nanoscale actuation and delivery. However, many commonly used magnetic materials (e.g., Ni and Co) are not biocompatible, possess weak magnetic remanence (Fe 3 O 4 ), or cannot be implemented in nanofabrication schemes (NdFeB). Here, it is demonstrated that co‐depositing iron (Fe) and platinum (Pt) followed by one single annealing step, without the need for solution processing, yields ferromagnetic FePt nanomotors that are noncytotoxic, biocompatible, and possess a remanence and magnetization that rival those of permanent NdFeB micromagnets. Active cell targeting and magnetic transfection of lung carcinoma cells are demonstrated using gradient‐free rotating millitesla fields to drive the FePt nanopropellers. The carcinoma cells express enhanced green fluorescent protein after internalization and cell viability is unaffected by the presence of the FePt nanopropellers. The results establish FePt, prepared in the L1 0 phase, as a promising magnetic material for biomedical applications with superior magnetic performance, especially for micro‐ and nanodevices.