1. An aqueous dispersion comprising a cerium oxide-doped, pyrogenically produced silicon dioxide, wherein the cerium oxide is introduced through an aerosol of a cerium salt solution or suspension and the average particle size in the dispersion is less than 100 nm.
2. The aqueous dispersion according to claim 1, in which the cerium content of the doped silicon dioxide range from 10 ppm to 10 wt. %.
3. The aqueous dispersion according to claim 1, wherein the BET surface of the cerium oxide-doped silicon dioxide range from 5 to 600 m2g.
4. The aqueous dispersion according to claim 2, wherein the BET surface of the cerium oxide-doped silicon dioxide range from 5 to 600 m2g.
5. The aqueous dispersion according to any of claim 1, in which the solids content in the dispersion is from 0.1 to 70 wt. %.
6. The aqueous dispersion according to claim 2, in which the solids content in the dispersion is from 0.1 to 70 wt. %.
7. The aqueous dispersion according to claim 3, in which the solids content in the dispersion is from 0.1 to 70 wt. %.
8. The aqueous dispersion according to claim 1, wherein the pH value of the dispersion is from 3 to 11.
9. The aqueous dispersion according to claim 2, wherein the pH value of the dispersion is from 3 to 11.
10. The aqueous dispersion according to claim 3, wherein the pH value of the dispersion is from 3 to 11.
11. The aqueous dispersion according to claim 4, wherein the pH value of the dispersion is from 3 to 11.
12. The aqueous dispersion according to claim 1, wherein its pH value amines or alkali hydroxides.
13. The aqueous dispersion according to claim 2, wherein its pH value amines or alkali hydroxides.
14. The aqueous dispersion according to claim 3, wherein its pH value amines or alkali hydroxides.
15. The aqueous dispersion according to claim 4, wherein its pH value amines or alkali hydroxides.
16. The aqueous dispersion according to claim 5, wherein its pH value amines or alkali hydroxides.
17. The aqueous dispersion according to claim 1, further comprising adjusting the pH value by adding a carboxylic acid of the formula CnH21CO2H, where n0-6 or n8,10,12,14,16, or dicarboxylic acid of the formula HO2C(CH2)nCO2H, where n0-4, or hydroxycarboxylic acids of the general formula R1R2C (OH) CO2H, where R1H, R2CH3, CH2CO2H, CH (OH) CO2H or glycolic acid, pyruvic acid, salicylic acid or mixtures thereof.
18. A process for the production of the aqueous dispersion according to claim 1, comprising dispersing cerium oxide-doped, pyrogenically produced silicon dioxide in aqueous solution by means of a high energy input.
19. The process for the production of an aqueous dispersion according to claim 18, further comprising grinding and dispersing said cerium oxide-doped silicon dioxide in an aqueous solvent, by subjecting particles to be dispersed to pressure of up to 3500 kgcm2, and expanding said particles through a nozzle, and causing said particles to collide with one another or against a wall of a device used for grinding and dispersing.
20. A process for the chemical-mechanical polishing of a semiconductor substrate or of a layer applied thereto by subjecting said substrate or layer to polishing action by the aqueous dispersion of claim 1.
21. A process for producing a finely particulate surface coating on paper comprising subject paper to the aqueous dispersion of claim 1 for coating the paper.
22. A process for treating a glass surface comprising polishing said glass with the aqueous dispersion according to claim 1.
23. An aqueous dispersion comprising cerium oxide-doped pyrogenically produced silica dioxide, wherein the cerium oxide in the form of a solution or suspension and is homogeneously mixed as an aerosol with a gaseous mixture obtained from flame oxidation or flame hydrolysis of a volatile silicon compound and allowed to react in a flame.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A device for stabilizing a medical appliance in association with a body part of a subject, the device comprising:
a generally planar platform having a perforate inner surface bordered by an outer surface, said inner and outer surfaces being disposed on an upper plane of said platform, the platform having an underside comprising a non-stick surface, said platform being suitably sized for positioning said non-stick surface adjacent a body part while securing a medical appliance in engagement with the body part, said platform including one or more securing apparatus attached to the platform for being arranged about the body part for retaining the platform non-stick surface adjacent the body part, said platform being interposed medial to the body part and portions of said securing apparatus.
2. A device for stabilizing a medical appliance in association with a body part of a subject, the device comprising:
a generally planar platform having a perforate inner surface and an outer surface, said inner and outer surfaces being disposed on an upper plane of said platform, the platform having an underside comprising a non-stick surface, said platform being suitably sized for positioning said non-stick surface adjacent a body part while securing a medical appliance in engagement with the body part, said platform including one or more securing apparatus attached to the platform for being arranged about the body part for retaining the platform non-stick surface adjacent the body part, said platform being interposed medial to the body part and portions of said securing apparatus; and
one or more hook members being integrally formed within the inner surface of said platform, wherein said hook members protrude generally horizontally from a portal in said inner surface.
3. The device of claim 1 or 2 further comprising a fastener secured to the upper plane of the platform for retaining the medical appliance in engagement with said platform.
4. The device of claim 1 or 2 further comprising a pad detachably installed on the underside of the platform, said pad having a non-stick surface for positioning adjacent said body part.
5. The device of claim 4 wherein said detachable pad further includes a medicament or an emollient disposed on the non-stick surface thereof.
6. The device of claim 1 or 2 further comprising a retractable tray secured to the upper plane of the platform, said tray incorporating subject identification and health data.
7. The device of claim 1 or 2 wherein said platform is translucent to permit observation therethrough.
8. The device of claim 7 wherein said platform is fabricated from a resin, plastic, polycarbonate, polymer, rubber, foam, acrylic, nylon, polystyrene, or composite material.
9. The device of claim 1 or 2 wherein said securing apparatus includes a flexible ring incorporated along a length thereof for accommodating an expansion or contraction of said securing apparatus.
10. The device of claim 1 further comprising a duct formed through the inner surface of said platform and projecting upwardly therefrom for positioning about said body part.
11. The device of claim 10 wherein said duct further comprises an interior circumference for removably constraining said body part, and
a seam formed through a surface of said duct and through the inner surface of said platform, the seam extending outwardly from said platform inner surface.
12. A method for stabilizing a medical appliance in association with a body part of a subject, the method comprising:
employing a device comprising a generally planar platform having a perforate inner surface bordered by an outer surface, said inner and outer surfaces being disposed on an upper plane of said platform, said platform having an underside comprising a non-stick surface, said platform being suitably sized for positioning said non-stick surface adjacent a body part of a subject, and having one or more retractable securing apparatus attached to the platform for being arranged about the body part for retaining the non-stick surface adjacent the body part, said platform being interposed medial to the body part and portions of said securing apparatus;
placing said non-stick surface of the device platform at a desired site adjacent the body part;
positioning a medical appliance for engagement with said device;
contacting the body part with the medical appliance;
releasing and placing said retractable securing apparatus about the body part; and
fastening said retractable securing apparatus to said device platform for retaining the body part in contact with said medical appliance.
13. The method of claim 12 wherein said contacting step further comprises positioning said medical appliance onto integument of said body part.
14. The method of claim 12 wherein said contacting step further comprises subcutaneously introducing said medical appliance into said body part.
15. The method of claim 12 further comprising the step of employing one or more hook members integrally formed within the inner surface of said device platform, said hook members protruding generally horizontally from a portal in said inner surface.
16. The method of claim 12 further comprising the step of employing a fastener secured to the upper plane of the platform for retaining the medical appliance in engagement with said platform.
17. The method of claim 12 further comprising the step of employing a pad being detachably installed onto the underside of the platform, said pad having a non-stick surface for positioning adjacent said body part.
18. The method of claim 12 further comprising the step of employing a pad being detachably installed onto the underside of the platform, said pad having a non-stick surface for positioning adjacent said body part, said non-stick surface including a medicament or an emollient disposed thereon.
19. The method of claim 12 further comprising the step of employing a retractable tray secured to the upper plane of the platform, said tray incorporating subject identification and health data.
20. The method of claim 12 further comprising the step of employing a flexible ring incorporated along a length of said securing apparatus for accommodating an expansion or contraction of said securing apparatus.