# US 8,465,808 B2 · Process for depositing an organic acid on the surface of a metal composition

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- Number: US 8,465,808 B2
- Document ID: US8465808B2
- Status: Granted
- Kind: B2
- Application number: 11/542,742
- Filed: 2006-10-04
- Published: 2007-04-05
- Granted: 2013-06-18
- Earliest claimed: 2005-10-05
- Assignees: Duquesne University of the Holy Spirit
- Applicants: Ellen S. Gawalt
- Inventors: Ellen S. Gawalt
- Web page: https://patentgrep.com/patent/US8465808B2

## CPC

- B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23)
- A61L 27/306: {Other specific inorganic materials not covered by A61L27/303 - A61L27/32}
- A61L 29/106: {Inorganic materials other than carbon}
- A61L 31/088: {Other specific inorganic materials not covered by A61L31/084 or A61L31/086}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- B05D 1/02: performed by spraying
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

A process for modifying a surface of a metal is provided. The process includes providing a metal surface having a metal oxide, contacting the metal oxide with an organic acid having a hydroxamic acid, a sulphonic acid, or a carboxylic acid functional group, and depositing the organic acid on the surface of the metal oxide for providing a modified metal surface. Modified metal compositions are disclosed having a metal surface or a metal alloy surface having a metal oxide, and an organic acid having a functional group that is deposited onto the surface of the metal oxide forming a self assembled monolayer, multiple monolayers, or a film of a sulphonate, a hydroxamic acid, or a carboxylate with —COOH, —OH and —NH2 terminal tail groups on the native oxide surface of the metal or the metal alloy.

## Claims

### Claim 1

A process for modifying a surface of a metal comprising:
providing a metal surface having a metal oxide, wherein said metal is stainless steel,
contacting said metal oxide with an organic acid solution or aerosol having a combination of a concentration of from 0.35 mM to 2.0 mM and a temperature ranging from above 0° Centigrade to 120° Centigrade and having a hydroxamic acid or a carboxylic acid functional group, wherein said carboxylic acid has a formula CO2HCnH2nX or wherein said hydroxamic acid has a formula XCONHOH, and wherein X is selected from the group consisting of CH3, COOH, OH, NH2, and Br, and n is a number ranging from greater than about 4 to less than or equal to 30, and
depositing said organic acid having said functional group on the surface of said metal oxide by solution or spray deposition for providing a modified metal surface wherein said organic acid that is deposited on said surface of said metal oxide has a monolayer free of micelle or island formation and a thickness ranging from greater than or equal to 12 Angstroms to less than or equal to 100 Angstroms.

### Claim 2

A process for modifying a surface of a metal comprising:
providing a metal surface having a metal oxide, wherein said metal is nitinol,
contacting said metal oxide with an organic acid solution or aerosol having a combination of a concentration of from 0.35 mM to 2.0 mM and a temperature ranging from above 0° Centigrade to 120° Centigrade and having a hydroxamic acid or a carboxylic acid functional group, wherein said carboxylic acid has a formula CO2HCnH2nX or wherein said hydroxamic acid has a formula XCONHOH, and wherein X is selected from the group consisting of CH3, COOH, OH, NH2, and Br, and n is a number ranging from greater than about 4 to less than or equal to 30, and
depositing said organic acid having said functional group on the surface of said metal oxide by solution or spray deposition for providing a modified metal surface wherein said organic acid that is deposited on said surface of said metal oxide has a monolayer free of micelle or island formation and a thickness ranging from greater than or equal to 12 Angstroms to less than or equal to 100 Angstroms.

### Claim 3

A process for modifying a surface of a metal comprising:
providing a metal surface having a metal oxide, wherein said metal is a metal alloy,
contacting said metal oxide with an organic acid solution or aerosol having a combination of a concentration of from 0.35 mM to 2.0 mM and a temperature ranging from above 0° Centigrade to 120° Centigrade and having a hydroxamic acid or a carboxylic acid functional group, wherein said carboxylic acid has a formula CO2HCnH2nX or wherein said hydroxamic acid has a formula XCONHOH, and wherein X is selected from the group consisting of CH3, COOH, OH, NH2, and Br, and n is a number ranging from greater than about 4 to less than or equal to 30, and
depositing said organic acid having said functional group on the surface of said metal oxide by solution or spray deposition for providing a modified metal surface wherein said organic acid that is deposited on said surface of said metal oxide has a monolayer free of micelle or island formation and a thickness ranging from greater than or equal to 12 Angstroms to less than or equal to 100 Angstroms.

### Claim 4 (depends on 3)

The process of claim 3 including wherein said metal alloy comprises at least two or more of the elements selected from the group consisting of iron, nickel, chromium, manganese, tantalum, silicon, titanium, copper, zirconium, and molybdenum.