Modified magnetite nanoparticle

K. M., Gu, H.W., Zhang, B Zhang, X.X. and Xu, B. (2006) A biocompatible method of decorporation bisphosphonate-modified magnetite nanoparticles to remove uranyl ions from blood. Journal of the American Chemical Society, 128 (41), 13358-13359. 

Immobilization of GpdQ on modified magnetite nanoparticles and of biomimetics attached to resins will be presented. Comprehensive characterization of activity and properties of the immobilized systems will be conducted as a starting point for future applications of these systems in bioremediation (Chap. 8). 

The next chapter will present an overview on how model complexes can, potentially, be used in applications for water decontamination by attaching them to insoluble polymers, for example, Merrifield resin. In addition, GpdQ will be immobilized onto dendrimer-modified magnetite nanoparticles to generate a potentially recyclable organophosphate bioremediation system. 

Generation 3 PAMAM dendrimer modified magnetite nanoparticles were synthesized after a modification of previously published methods (Fig. 8.16a) [1, 2]. In brief, aqueous solutions of ferric chloride and ferrous sulfate were combined under vigorous stirring and the magnetite subsequently co-precipitated by adding ammonia solution. 

PAMAM dendrimer modified magnetite nanoparticles were tested as supports for GpdQ and a biomimetic complex. Previous studies have shown that a G3-PA-MAM dendrimer has a beneficial effect for protein immobilization opposed to unsubstituted MNP [1]. The dendrimer was build up stepwise by alternating additions of methanofic methyl acrylate and ethylenediamine solutions. The pendant amine functions were then further functionalized with glutaraldehyde. 

Fig. 10 (a, b) Schematic mechanism demonstrated for a reflective color M-paper with magnetically controllable characteristics, (c, d) The intensity of magnetic field dependence on the reflection spectra of chiral nematic mixtures doped with magnetite nanoparticles that are surface modified with oleic acid and a chiral pyridine-based dopant, as well as photographs of both formulations before and after a magnetic field of 1,000 GS was applied (see photograph insets above) [364], (Copyright 2010, Taylor Francis)... 

A final example implies no surface modification. Using magnetite nanoparticles as seeds, Sun et al. [164] described the synthesis of magnetic core-poly(AAm) shell particles obtained by UV irradiation of an aqueous solution of F03O4, AAm, and MBA. The surface of the particles was then modified to introduce amino groups, subsequently linked to L-histidine labeled with Re, one of the most efficient radioisotopes for cancer radiotherapy. 

Shen, X.C. Fang, X.Z. Zhou, Y.H. Liang, H. (2004), Synthesis and characterization of 3-aminopropyltriethoxysilane-modified superparamagnetic magnetite nanoparticles. Chem, Lett, 33 1468-1469. 

Can, K Ozmen, M. Ersoz, M (2009). Immobilization of albumin on aminosilane modified superparamagnetic magnetite nanoparticles and its characterization. Colloids Surf. B, 71,154-159. 

Figure 3.13 TEM Image of the Magnetic Pd Nanocatalyst Prepared by Direct Decomposition of [Pd2(dba)3] onto Amino-Modified Silica-Coated Magnetite Nanoparticles as Support. Adapted...

Jandky C, Kormanyos A, Visy C (2011) Magnetic hybrid modified electrodes, based on magnetite nanoparticle containing polyaniline and poly (3,4-ethylenedioxythiophene). J Solid State Electrochem 15 2351-2359... 

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