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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

2003

Vol. 21, No. 4

481-485

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.

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

2002

Vol. 20, No. 2

19-22

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.