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The coating of n[SiO1.5-(CH2)3(NH2)] ultrathin layers on the surface of Fe3O4 nanoparticles and the analysis of their coating dynamics

P. ZAMORA IORDACHE1,* , V. ŞOMOGHI1, I. SAVU1, N. PETREA1, G. MITRU1, R. PETRE1, B. DIONEZIE2, V. ORDEANU3, L. KIM4, L. MUTIHAC4

Affiliation

  1. Scientifical Research Center for NBC Defence and Ecology, 225, Olteniţei, Bucharest,Romania
  2. Politehnica University of Bucharest – Biomaterials Research Center, 313, Spl. Independentei, Bucharest, Romania
  3. Medico-Military Scientifical Research Center, 37, C.A. Rosetti, Bucharest, Romania
  4. University of Bucharest, Department of Analytical Chemistry, 4-12, Regina Elisabeta Blvd., 030018 Bucharest, Romania

Abstract

This paper presents the unitary and controlled synthesis of nanostructures of the type Fe3O4-n[SiO1.5-(CH2)3(NH2)]-Snθ [Fe3O4 = magnetic core; n[SiO1.5-(CH2)3(NH2)] = coating layer; -NH2 = layer made up of groups which play an important part in biochemical interface; Snθ = exterior layer of biochemical cross-linked molecules]. The purpose of obtaining these nanostructures is to fix Fe3O4-n[SiO1.5-(CH2)3(NH2)]-Snθ on microorganism surface through covalent chemical bounds in order to determine them in magnetic field, as a function of the mass and volume of the microorganisms attached to the nanostructures. The nanocomposite materials with physical and chemical features induced in a controlled way in the basic physical structure in order to handle in a controlled manner the host structures, constitute a research field of current interest. The nanostructures we have drawn up are also important in fields connected to chemistry, such as: selective/unselective chemical separation, molecular macrocomplexes labeling, chemical/biological detection media and others.

Keywords

Fe3O4-SiO2-NH2 core-shell nanoparticle, Superparamagnetic, Cross-linked molecule.

Citation

P. ZAMORA IORDACHE, V. ŞOMOGHI, I. SAVU, N. PETREA, G. MITRU, R. PETRE, B. DIONEZIE, V. ORDEANU, L. KIM, L. MUTIHAC, The coating of n[SiO1.5-(CH2)3(NH2)] ultrathin layers on the surface of Fe3O4 nanoparticles and the analysis of their coating dynamics, Optoelectronics and Advanced Materials - Rapid Communications, 2, 8, August 2008, pp.491-497 (2008).

Submitted at: June 10, 2008

Accepted at: July 16, 2008