Department of Chemistry and Kanbar Laboratory for Nanomaterials

Bar-Ilan University Center for Advanced Materials & Nanotechnology

Bar-Ilan University, Ramat-Gan, 52900, Israel

In the last few years we have employed three techniques for the fabrication of metal oxides nanoparticles. These methods are: Sonochemistry, Microwave dielectric heating, and RAPET (Reaction under Autogenic Pressure at Elevated Temperatures).

An introduction to these three methods will be presented in my presentation and examples will be given.

In the sonochemical method we will emphasize the difference in the products obtained from a precursor which is volatile solute (transition metal carbonyls) and a precursor that is a nonvolatile solute. The first precursor will yield an amorphous product because of the fast cooling rates obtained upon the collapse of the bubble whereas the latter yields a nanocrystalline product.

The Microwave reactions were conducted in a domestic microwave oven that underwent a modification to include a distillation column. We will present the antimicrobial effect of a metal oxide strongly dependent on the particle size. The mechanism of the bacteria killing will be discussed. Another example of doping one metal oxide in another for example doping MnO in ZnO is made easy by the use of microwave radiation.

For the RAPET section we will present results in which transition metal oxides encapsulated in a carbon shell are being produced. The precursors for these reactions are the corresponding alkoxides. The same RAPET reaction under identical conditions was also carried out between the poles of a strong magnetic field (10T). In certain cases the magnetic field has no effect on the products while for others a dramatic change is observed.

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1. Coating anti-bacterial nanoparticles on flat and curved surfaces, and fighting resistant bacteria by employing the sonochemical method
2. Coating Flat and Curved Surfaces by Nanoparticles Using Ultrasound and Microwave Radiations
3. Synthesis of doped ZnO nanopowders in microwave hydrothermal reactors
4. Combining microwave and pressure techniques for hydrothermal synthesis of ZnO and ZrO₂ nanopowders doped with a range of metal ions
5. Producing metal oxide nanoparticles by the sonochemical, microwave and RAPET techniques.
6. Doping of ZnO nanopowders with Mn, Ni and Cr In an ultrasound and microwave driver hydrothermal reaction
7. Novel Methods for the Fabrication of Nanomaterials and Their Applications
8. Application of ultrasonically produced nano zerovalent iron for the degradation of chloroethenes
9. Doping of ZnO nanopowders with Mn and Cr in an ultrasound and microwave driven hydrothermal reaction