CZ – TechConnect Briefs

Analysis of Water Resistance and Mechanical Performance of Microporous Polyurethane Membrane Laminated Waterproof Breathable Fabrics

Razzaque A., Tesinova P., Technical University of Liberec, CZ

Composite waterproof breathable textile fabric made with membrane must be characterized by better water resistance and simultaneously good possible permeability of water vapour in order to use as protective clothing or sportswear. This paper describes [...]

Carcinoma cellular uptake, imaging, and targeting by RGDS- and TAT-conjugated upconversion and/or magnetic nanoparticles

Horák D., Kostiv U., Proks V., Jirák D., Institute of Macromolecular Chemistry AS CR, CZ

Specific targeting and in vivo visualization of cancer cells is of crucial importance for early detection and treatment of cancer. We have developed monodisperse poly(ethylene glycol) (PEG)-modified SiO2-coated Fe3O4 superparamagnetic nanoparticles [1] with size tuned [...]

Nanofiller-modified microfibrillar composites: origin of complex effect of nanoparticles with different geometry

Kelnar I., Kratochvíl J., Padovec Z., Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, CZ

Microfibrillar composites (MFCs) are polymer – polymer composites prepared by drawing of suitable polymer blends, where application of various nanofillers have strong potential to eliminate basic disadvantage of MFC arising from limited parameters of polymer [...]

Cavitation Disintegration of Microparticles and Nanoparticles in Dense Liquid Dispersions

Dvorsky R., Svoboda L., Trojková J., Bednář J., Mančík P., Kostura B., Vysoká škola báňská – Technická univerzita Ostrava, CZ

With the current rapid development of nanotechnology, top-down preparation of nanoparticles by various disintegration techniques became an important industrial sector. In addition to the presently common high speed bead mills working with particles in liquid [...]

Temperature Stability of AgCu Nanoparticles

Sopousek J., Zobac O., Vykoukal V., Bursik J., Roupcova P., Broz P., Pinkas J., Vrestal J., Masaryk University, CZ

The Ag-Cu nanoparticles (NPs) were prepared from metallo-organic precursors by solvothermal synthesis. The CALPHAD approach was used for prediction of the Ag-Cu phase diagram in both macro and nano scales. The detailed experimental characterization was [...]

Energy and Charge Transfer between Quasi-zero-dimensional Nanostructures

Kral K., Mensik M., Institute of Physics, Academy of Sciences of Czech Republic, CZ

Theory is presented of the electronic excitation and electronic charge transfer between quantum dots. Kinetic equations describing this irreversible transfer are developed using quantum transport approach. The non-adiabatic property of the electron coupling to the [...]

Preparation of Photocatalytic Silicon Core-shell Nanoparticles Covered by ZnS Shell in Solid-Gas Reaction

Dvorsky R., Praus P., Svoboda L., Matýsek D., Dropa T., Trojková J., Šollová K., VŠB-Technical University of Ostrava, CZ

For easy handling in some practical processes, active nanoparticles are usually deposited on surfaces of larger carrier particles. In our previous work, the particles of montmorillonite MMT with a mean size of 300 nm served [...]

Preparation of Composite of ZnS Nanoparticles and Montmorillonite by Cavitation Deposition

Praus P., Svoboda L., Kostura B., VŠB-Technical University of Ostrava, CZ

The ZnS-montmorillonite (MMT) nanocomposite was formed by cavitation implosion of ZnS nanoparticles into MMT pores. As a result of very high impact velocities at collisions of ZnS nanoparticles and MMT particles increase of a number [...]

Thermoelectric properties of nanocomposite Bi2Te3 layers prepared by PLD

Zeipl R., Jelinek M., Vlčekb M., Kocourek T., Vanišc J., Institute of Physics ASCR, CZ

We present some thermoelectric properties of Bi2Te3 nano-layers of different thickness prepared by Pulsed Laser Deposition such as the thermal conductivity, in-plain electrical conductivity and the Seebeck coefficient. Layers are prepared under various deposition conditions. [...]

Gaseous Nanobubbles – Surface Nanopatterning Elements

Janda P., Tarabkova H., J. Heyrovsky Institute of Physical Chemistry ASCR, CZ

Gaseous nanobubbles adhering to solid surfaces immersed in de-ionized water were found to exhibit interfacial forces capable of nanopatterning hydrophobic surfaces at mild conditions. Random and net-like periodic nanopattern imprinted in polymeric film represent images [...]