Synthesis, Magnetic Properties, and Relaxivity of CoFe@C and NiFe@C Nanocomposites


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Abstract

Core–shell CoFe@C and NiFe@C nanocomposites were prepared by gas-condensation synthesis. CoFe@C and NiFe@C particles had bcc and fcc cores, respectively. The treatment of these nanocomposites with hydrochloric acid revealed that they are more chemically stable than Fe@C composites. The maximum specific magnetization of CoFe@C and NiFe@C nanocomposites at room temperature in the field with a strength of 27 kOe was 125 and 58 G cm3/g, respectively. The processes of longitudinal and transverse relaxation of nuclear proton spins of aqueous suspensions of nanocomposites in various magnetic fields (0.5, 1, and 2 kOe) were studied. NiFe@C and CoFe@C nanocomposites have high transverse relaxivity values and can be used as magnetic markers for detection of low concentrations of bioobjects by NMR relaxometry.

About the authors

I. V. Byzov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Institute of Ecology and Genetics of Microorganisms, Ural Branch, Russian Academy of Sciences

Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Perm, 614081

A. A. Mysik

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

A. S. Konev

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin

Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Ekaterinburg, 620002

S. I. Novikov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

A. Ye. Yermakov

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Institute of Ecology and Genetics of Microorganisms, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin

Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Perm, 614081; Ekaterinburg, 620002

M. A. Uimin

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Institute of Ecology and Genetics of Microorganisms, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin

Author for correspondence.
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Perm, 614081; Ekaterinburg, 620002

A. S. Minin

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Institute of Ecology and Genetics of Microorganisms, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin

Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Perm, 614081; Ekaterinburg, 620002

V. S. Gaviko

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108

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