Nanomaterials - Consulting and education

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Dieter Vollath

Properties of Nanomaterials

Mechanical properties
The large amount of grain boundaries in bulk materials made of nanoparticles allows extended grain boundary sliding leading to high plasticity.

Catalytic Properties
Due to their large surface, nanoparticles made of transition element oxides exhibit interesting catalytic properties. In special cases, catalysis may be enhanced and more specific by decorating these particles with gold or platinum clusters.

Magnetic Properties
In magnetic nanoparticles, the energy of magnetic anisotropy may be that small that the vector of magnetization fluctuates thermally; this is called superparamagnetism. Such a material is free of remanence, and coercitivity. Touching superparamagnetic particles are loosing this special property by interaction, except the particles are kept at distance. Combining particles with high energy of anisotropy with superparamagnetic ones leads to a new class of permanent magnetic materials.

Optical Properties
Distributions of non-agglomerated nanoparticles in a polymer are used to tune the index of refraction. Additionally, such a process may produce materials with non-linear optical properties. Gold or CdSe nanoparticles in glass lead to red or orange coloration. Semi-conducting nanoparticles and some oxide-polymer nanocomposites exhibit fluorescence showing blue shift with decreasing particle size.

For further information please visit our Intensive Course Nanomaterials.