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Toroidal Protein Adaptor Assembles Ferrimagnetic Nanoparticle Fibers with Constructive Magnetic Coupling

Toroidal Protein Adaptor Assembles Ferrimagnetic Nanoparticle Fibers with Constructive Magnetic Coupling

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PHAM, Tuan Anh, Andreas SCHREIBER, Stefan M. SCHILLER, Helmut CÖLFEN, 2017. Toroidal Protein Adaptor Assembles Ferrimagnetic Nanoparticle Fibers with Constructive Magnetic Coupling. In: Advanced Functional Materials. 27(7), 1604532. ISSN 1616-301X. eISSN 1616-3028

@article{Pham2017-02Toroi-37795, title={Toroidal Protein Adaptor Assembles Ferrimagnetic Nanoparticle Fibers with Constructive Magnetic Coupling}, year={2017}, doi={10.1002/adfm.201604532}, number={7}, volume={27}, issn={1616-301X}, journal={Advanced Functional Materials}, author={Pham, Tuan Anh and Schreiber, Andreas and Schiller, Stefan M. and Cölfen, Helmut}, note={Article Number: 1604532} }

Pham, Tuan Anh Inspired by nature, the synthesis of biohybrid nanocomposites containing inorganic nanoparticles (NPs) and biopolymers such as DNA and peptides as templates offers great potential for a wide range of applications. Using selective recognition schemes of 3D protein spaces for the assembly of magnetic nanocrystals is a challenge with great promise in the field of biomedicine and magnetic data storage. Here we apply the toroidal protein Hcp1 as an interparticle connector for the directed molecular assembly and ferrimagnetic coupling of biohybrid cobalt ferrite NP wires. The resulting biohybrid NP composites show bundles of nanofibers ranging from nano- to the microscale in length verified by TEM, EDX analysis and focused ion beam cut. Their magnetic characterization reveals an increase of the coercive field (+12%) reaching values of high-end Nd<sub>2</sub>Fe<sub>14</sub>B bulk magnets, enhanced saturation (+28%) and remanence magnetization (+38%) at 2 K compared to NPs lacking the protein connector. Thus, the combination of the nanoscale alignment of magnetic NPs with the molecular precision of the protein connectors leads to constructive addition of the magnetization reversal energy. This approach can be used to control magnetic properties for the design of materials with enhanced coercivity applicable for magnetic data storage, hyperthermia and theranostics. 2017-03-01T14:26:42Z Cölfen, Helmut Schiller, Stefan M. Schreiber, Andreas Schreiber, Andreas 2017-03-01T14:26:42Z eng Toroidal Protein Adaptor Assembles Ferrimagnetic Nanoparticle Fibers with Constructive Magnetic Coupling Pham, Tuan Anh Cölfen, Helmut 2017-02 Schiller, Stefan M.

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