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Enhancing properties by the use of nanoparticles

a technology of nanoparticles and nanoparticles, applied in the field of composite materials, can solve the problems of short shelf life and usually found silver conten

Inactive Publication Date: 2005-08-11
NANO MET ZERO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The silver-coated nanoclays exhibit excellent antimicrobial properties, remain stable, and require less silver to achieve the same surface area as solid silver particles, enhancing their cost-effectiveness and application in various compositions.

Problems solved by technology

They are often unstable, however, and have a short shelf life.
Another problem of the commercially available solutions is that the majority of the silver content is usually found to be silver ions.
This poses a large problem in medical applications where silver ions rapidly combine with ubiquitous chloride to form an insoluble white precipitate.

Method used

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  • Enhancing properties by the use of nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0088] In order to deposit silver metal on nanoclay, silver ions were reduced in the presence of Laponite using the Tollen's reagent, which is able to undergo reduction by either an aldehyde or ketone to form silver metal via the following reaction:

Ag(NH3)2OH+glucose→Ag0

[0089] The Tollen's reagent was prepared by adding two drops of 10% NaOH to 5 mL of 5% AgNO3 to form a gray-brown precipitate. This precipitate was then dissolved by the dropwise addition of 2% NH4OH to yield a total Tollen's reagent volume of 30 mL.

[0090] A solution of silver-loaded Laponite XLS was prepared by adding 600 mg of Laponite XLS to 50 mL of distilled water and using a magnetic stirrer to exfoliate for 20 minutes. To this solution, 800 mg of glucose were added and the stirring continued for 10 minutes to ensure complete dissolution of the glucose. To this, 10 mL of Tollen's reagent as prepared above were added. After two hours of continuous stirring, the solution turned golden yellow in color. Further r...

example 2

[0091] The formation of silver metal from silver ions was also investigated using NaBH4:

4AgNO3+NaBH4→4Ag0

[0092] Dropwise addition of 32 mg of AgNO3 dissolved in 5 mL of H2O to a solution containing 500 mg of exfoliated Laponite XLS and 4 mg NaBH4 yielded a golden yellow solution. This addition order for this particular reaction was determined to give the smallest particle size.

example 3

[0093] Nanoparticles of silver-laponite were prepared by reduction with sodium citrate, although the reduction by this method was more difficult to control. Citric acid was added to an exfoliated Laponite XLS solution, followed by the addition of silver nitrate. 10% NaOH was added dropwise to form the sodium salt of citric acid until the solution turned faintly yellow. In many cases, the over-addition of sodium hydroxide caused the silver particles to fall out of solution.

AgNO3+sodium citrate→Ag0

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Abstract

Composite materials comprising nanoparticles functionalized with metals are disclosed. The composite materials may be used in a variety of applications, including in coating compositions, cosmetic and pharmaceutical compositions, absorbent articles, and the like.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims priority from U.S. provisional application Ser. No. 60 / 515,758 filed Oct. 30, 2003.FIELD OF THE INVENTION [0002] The present invention relates to composite materials that are functionalized nanoparticles and in particular, metal-loaded nanoclays. Additionally, the present invention relates to a method of forming such composite materials. BACKGROUND OF THE INVENTION [0003] For centuries, silver metal has been known to be an agent capable of killing many different microbial species. It was commonly used to purify drinking solutions or administered to sick individuals before the existence of modern antibiotics. Even after the discovery of penicillin and its descendents, colloidal silver solutions were often used in cases in which troublesome bacteria had become resistant to antibiotics. [0004] Colloidal silver solutions are commercially available today. They are often unstable, however, and have a short shelf life. T...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F13/15A61K8/04A61K8/11A61K8/19A61K8/25A61L15/18A61L15/40A61L15/42A61L15/44A61L15/46A61L15/48A61Q11/00A61Q19/00B01J20/00B05D3/02B05D7/00B32B15/02B32B18/00C09C1/62
CPCA61F13/8405Y10T428/2991A61K8/0241A61K8/19A61K8/25A61K2800/413A61K2800/621A61L15/18A61L15/42A61L15/46A61L2300/102A61L2300/104A61L2300/624A61Q11/00A61Q19/00B82Y5/00A01N25/28A61K8/0245A61K9/5115C09D1/00A61F2013/8426
Inventor DISALVO, ANTHONY L.MORDAS, CAROLYN J.
Owner NANO MET ZERO
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