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Fine particle dispersion compositions and uses thereof

a technology of dispersion composition and fine particles, applied in the field of dispersion compositions, can solve the problems of introducing additional complications or disadvantages into the refrigeration and air-conditioning system, and achieve the effect of improving thermal conductivity

Inactive Publication Date: 2006-02-09
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] The present invention additionally relates to a synthetic oil composition comprising fine particles of metal or metal oxide and at least one dispersant, said oil having enhanced thermal conductivity based on the presence of the dispersed fine particles.

Problems solved by technology

Most of the proposals introduce additional complications or disadvantages into the refrigeration and air-conditioning systems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Silver Nanoparticles

[0060] Silver nanoparticles were prepared by heating silver stearate to a temperature of 200° C. in an alumina boat in a tube furnace for one hour. A white solid sublimed to the cool portion of the tube. The black product in the boat was washed with acetone, which was decanted and the solid was air dried. A portion of the dried solid material was combined with 2,2,4-trimethylpentane producing a yellow colored mixture. The yellow mixture was shaken by hand until the the mixture developed a brown color indicating that the particles were well dispersed. A transmission electron micrograph of an evaporate of this dispersion showed well separated particles of 10-20 nanometer size.

example 2

Preparation of Copper Nanoparticles

[0061] Copper nanoparticles were prepared by heating copper formate to a temperature of 150° C. in an alumina boat for one hour. The resulting solid from the boat was combined with octane to produce a colorless suspension. Tyndall scattering was produced by shining a light beam through the suspension indicating a particles size of less than 50 nanometers.

example 3

Preparation of a Silver Dispersion in Lubricating Oil

[0062] A dispersion of silver particles was prepared by combining silver stearate and Zerol® 150 (linear alkylbenzenes sold by Shrieve Chemicals, The Woodlands, Tex.) in a 1 liter round bottom flask. The flask was then heated with stirring for one hour at 200° C. The product was a black dispersion of silver particles in oil. The particles were collected and analyzed by transmission electron microscopy and shown to be in the 10 to 20 nanometers in size range.

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PUM

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Abstract

The present invention relates to dispersion compositions comprising synthetic oils or other heat transfer fluids and fine particles. The compositions also comprise at least one dispersant. The dispersion compositions have improved thermal conductivity properties, which may translate to improved energy efficiency performance in a variety of heat transfer applications. Such applications include vapor compression air conditioning and refrigeration systems of all types, secondary heat transfer fluids, and other heating or cooling fluid applications.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority benefit of U.S. provisional application 60 / 599,330, filed on Aug. 5, 2004.FIELD OF THE INVENTION [0002] The present invention relates to dispersion compositions comprising synthetic oils and fine particles. The compositions also contain at least one dispersant to provide for more uniform suspensions. Some of these dispersion compositions have improved thermal conductivity properties, which may translate to improved energy efficiency performance in a variety of heat transfer dependant applications. Such applications include vapor compression air conditioning and refrigeration systems of all types, secondary heat transfer fluids, and other heating or cooling fluid applications. BACKGROUND [0003] Environmental concerns regarding excessive energy consumption have prompted many industries to modify their commercial products and / or equipment designs to conserve energy. In addition, the U.S. Government has mand...

Claims

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Application Information

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IPC IPC(8): C10G47/24
CPCC09K5/10C10M171/008C10M2201/05C10M2201/062C10M2203/065C10M2207/2835C10N2230/06C10M2219/044C10N2210/01C10N2210/02C10N2210/04C10N2210/08C10N2220/082C10M2209/1033C10N2010/14C10N2010/02C10N2010/08C10N2010/04C10N2020/06C10N2030/06Y02P20/10C10N2010/16
Inventor LECK, THOMAS J.SPAHR, DOUGLAS ERICMAHLER, WALTER
Owner EI DU PONT DE NEMOURS & CO
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