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Modern technologies open the possibilities to fabricate the nanomaterials with various dimensionalities of nanostructures. An attractive category of nanomaterials are nanoparticles. Nanoparticles become more and more important in many areas, especially in development of new high-tech materials. Clay minerals (especially clay particles as vermiculite, kaolinite or montmorillonite) are materials that have interesting features, which can be predestinate for industrial usage e.g. ceramic, paper-making, pharmaceutical, cosmetics industry. Nano-dimensional layered character of phyllosilicates (subgroup of clays) opens new perspectives for their utilization in nanotechnology.

For that reason is very important to know variances of properties of individual particles fraction (fundamental chemical and physical properties), because many properties of solid particles are not only a function of the materials bulk properties, but also depend on the particle size distribution. These properties changes arise from the increasing influence of surface properties in comparison to volumetric bulk properties as the particle size decreases (Wieczorek-Ciurowa et al., 2007).

The milling methods represent one of the most popular approaches to produce clay nanoparticles by the mechanical way. Fine grinding is normally carried out in energy intensive grinding mills such as planetary mill, scillating mill and jet mill (Gommeren et al., 2000). Besides size reduction, the ground particles exhibited mechanochemical effect due to severe and high-intensity energy delivered by the grinding mill onto the particles which led to structural changes at near surface region where the solids came into contact under mechanical forces. Jet mills are commonly used to produce particle sizes between 1µm and 10 µm. This technique is relatively simple preparation method for particles with defined size, although is energy consuming (Palaniandy et al., 2008).

This work was solved in the frame of the research project of GAČR 205/09/0352 and Ministry of Education, Youth and Sport of Czech Republic MSM 619 891 0016.

Wieczorek-Ciurowa K., Gamrat K. (2007). Some aspects of mechanochemical reactions. Materials Science-Poland 25, 219-232.

Gommeren H.J.C., Heitzmann D.A., Moolenaar J.A.C., Scarlett B. (2000). Modelling and control of a jet mill plant. Powder Technology 108, 147-154.

Palaniandy S. , Azizli K. A. M., Hussin H., Hashim S. F. S.(2008). Mechanochemistry of silica on jet milling. Journal of materials processing technology 205, 119-127.