**6. Acknowledgment**

The financial support of MATNANTECH Program of the Romanian Ministry of Education and Research, by means of CEEX project no. 16/2005-2007, to achieve this contribution is gratefully acknowledged.

The authors are gratefully acknowledged for their collaboration with C. Radovici for XRD, C. Nistor for DLS and S. Serban for TGA from National Research and Development Institute for Chemistry and Petrochemistry-ICECHIM, Bucharest and to "Petru Poni" Institute of Macromolecular Chemistry, Romanian Academy, Iasi team which provided maleic copolymers.

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**7** 

*Romania* 

**Tailored and Functionalized Magnetite Particles** 

**for Biomedical and Industrial Applications** 

*1Centre of Advanced Research in Bionanoconjugates and Biopolymers, "Petru Poni"* 

Magnetic particles have a significant role in nanotechnology due to their surface properties and their applicability in physical and chemical processes like ionic exchange, specific complexation, biocompatibility and bioactivity, capacity of selection and transport for cells

Magnetite is an interesting superparamagnetic nanomaterial, considered as a challenge by the modern research related magnetic applications, due to its high susceptibility at oxidation

The name "superparamagnetic" refers to those particles that in presence of magnetic field are attracted and in absence of the magnetic field the particles don't have residual magnetism. The importance of magnetite particles is related to their most important properties - magnetic and catalytic. These properties are strongly dependent on the selected

These magnetic particles are used in many applications that involve their immobilization and transport in the presence of magnetic field, or magnetically tagged biological entities

The chapter describes the most important approaches in the preparation of magnetite particles, as presented in the literature. An introspective view of biomedical, industrial and

The magnetite particles are usually attracted to each other. Electrostatic or steric stabilization represent the main step in obtaining "core-shell" magnetic particles with magnetite core and a shell formed by different surfactants. We summarize here some examples and also some data previously reported by our group (figure 1) on the preparation of magnetite particles coated by different Si-containing compounds (monomers and polymers) (Durdureanu-Angheluta et al., 2008; Durdureanu-Angheluta et al., 2009;

as compared to other magnetic compounds (Cornell & Schwertmann, 1996).

due to the intrinsic penetrability of magnetic fields into human tissue.

catalytic applications of magnetite micro- and nanoparticles is also reported.

and chemical compounds (Safarik & Safarikova, 2002).

Durdureanu-Angheluta et al., 2010; Pricop et al., 2010).

**1. Introduction** 

method of preparation.

Anamaria Durdureanu-Angheluta1,2,

*Technical University of Iasi, Iasi,* 

Mariana Pinteala1 and Bogdan C. Simionescu1, 2

*Institute of Macromolecular Chemistry of Romanian Academy, Iasi, 2Department of Natural and Synthetic Polymers, "Gh. Asachi"* 

S. (2010). Emerging Applications of Stimuli-Responsive Polymer Materials. *Nature Materials*, Vol. 9, No. 2, (January 2010), pp. (101-113), ISSN 1476-4660

