Phosphonate coating of commercial iron oxide nanoparticles for nanowarming cryopreserved samples.

"Conflicts of interest There are no conflicts to declare."

"The authors thank Dr Qi Shao for help with the HDF cell culture, Todd Rappe, Dr Gopinath Tata at the Minnesota NMR Center for help with HRMAS NMR, Dr Raj Suryanarayanan for use of the TGA and Dr Jon Rainier and Dr Rameshu Rallabandi for useful discussions and training. They also thank UMN's Department of Earth Science, and Institute for Rock Magnetism for providing instruments and assistance in characterization. This work was funded by 5 F31 DK124968-02, NSF EEC 1941543, R01 HL135046, and R01 DK117425. Research reported in this publication was supported by the Office of the Vice President of Research, College of Science and Engineering, and the Department of Chemistry at the University of Minnesota."