Wyniki wyszukiwania - BazTech

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Influence of synthesis conditions on the properties of FeXCoYOZ - nanoparticles in SiO2Sol-gel film

Sidsky V. V., Gaishun V. E., Demidenko O. M., Savitskaya T. A., Panykov V. V., Semchenko A. V.

Journal of Automation Mobile Robotics and Intelligent Systems

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2009

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Vol. 3, No. 4

91-92

EN

Synthesis conditions influence on structure of FexCoyOz - nanoparticle in SiO2 - sol-gel coating is discussed. The samples are synthesized by hybrid sol - gel method including following stages: TEOS hydrolysis, introduction into sol of Co(NO3)2 . 6H20 and Fe(NO3)3 . 9H20, deposition of film-forming sol by spin-coating on silica substrate, heat treatment at the temperature from 200 up to 900 °C. The Synthesis conditions influence on a specific structural property of sol gel films is investigated by AFM.

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Application of sol-gel process for preparation of functional materials

Gaishun V. E., Demidenko O. M., Kosenok Y. A., Kovalenko D. L., Semchenko A. V., Strek W.

Journal of Automation Mobile Robotics and Intelligent Systems

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2009

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Vol. 3, No. 4

121-123

EN

A development of high-performance materials for electronics, optics, ceramics fabrication is restrained by traditional modes of their production. Basic technologies for materials include high-temperature physical and chemical processes and require special conditions to attain desired properties of final products. Advanced preparation methods for materials with new features are feasible on the basis of colloid-chemical processes and nanochemistry. In this respect the sol-to-gel transformation followed by solidification and chemical modification are of great interest to attain a variety of different functional properties of materials.

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Rheology of silica suspensions stabilized by ethylenediamine

Gaishun V. E., Potapenok Y. A., Tulenkova O. I., Pakhovtchyshin S. V., Stręk W.

Materials Science

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2003

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Vol. 21, No. 4

481-485

EN

The effect of ethylenediamine bridging, particle size and specific surface area of fumed silica on rheological properties of silica suspensions were studied with a cylinder rheometer. The apparent viscosity of suspensions of aerosils A-50, A-175, A-300 and A-380 irreversibly increases with shearing time at shear rates above a certain value. The critical shear rate for shear-induced bridging coagulation decreases with the increasing ethylenediamine concentration because of lowering of the energy barrier due to a compression of the electrical double layer. The suspensions become elastic pastes after the bridging coagulation.

4

Preparation and properties of colloidal nanosize silica dioxide for polishing of monocrystalline silicon wafers

Gaishun V. E., Tulenkova O. I., Melnichenko I. M., Baryshnin S. A., Potapenok Y. A., Xlebokazov A. P., Stręk W.

Materials Science

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2002

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Vol. 20, No. 2

19-22

EN

Colloidal silica can be used for final general metallographic polishing. It is used to polish single crystal silicon for electronic applications and, subsequently, polycrystalline silicon for solar cells, gallium arsenide, indium phosphide, titanium, gadolinium gallium garnet and sapphire. The silica dioxide are dispersed in water with alkaline compound added to obtain the desired pH.