Functionalized nanostructured films

• US 5,674,592 A
• Filed: 05/04/1995
• Issued: 10/07/1997
• Est. Priority Date: 05/04/1995
• Status: Expired due to Term

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Johnson, Harry E., Debe, Mark K., Schultz, Robert K., Clark, John C., Ross, Danna L.
• Primary Examiner(s): Robinson, Ellis
• Assistant Examiner(s): KYRIAKOU, CHRISTOS
• Application Number:
  US08/434,925
• Time in Patent Office: 887 Days
• Field of Search: 428/161, 428/164, 428/156, 428/172, 428/141, 428/378, 428/379, 428/380, 427/534, 427/407.1, 427/434.3, 118/402
• US Class Current: 428/161
• CPC Class Codes: B05D 1/185 applying monomolecular layers B05D1/204 takes precedence
• CPC Class Codes: B05D 5/08 to obtain an anti-friction or anti-adhesive surface rendering particulate materials free-flowing in general, e.g. making them hydrophobic B01J2/30
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: F05D 2300/512 Hydrophobic, i.e. being or having non-wettable properties
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24521 with component conforming to contour of nonplanar surface
• CPC Class Codes: Y10T 428/24545 Containing metal or metal compound
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/2938 Coating on discrete and individual rods, strands or filaments
• CPC Class Codes: Y10T 428/2942 Plural coatings

Abstract

Low energy surfaces based on nanostructured films exhibit advancing and receding contact angles for liquids such that (1) the difference between the advancing and receding contact angles approaches zero and (2) the advancing and receding contact angles approach 180°. The low energy surface of the present invention comprises a nanostructured film coated with an organized molecular assembly (OMA). Advantageously, the chemical and wetting characteristics of the surface can be altered by changing the functionality of the OMA end groups exposed to the environment in contact with the surface of the nanostructured film.

Claims

1. A low energy surface composite comprising A nanostructured film comprising a plurality of discrete, elongated nanostructure elements of a first material conformally coated with a second material layer of molecules that form an organized molecular assembly creating a surface of a substantially homogeneous chemical functionality and wherein the nanostructure elements have an areal number density of 0.1 to 500/μ

m².

2. The nanostructured film according to claim 1 wherein the organized molecular assembly is a self-assembled monolayer.

3. The nanostructured film according to claim 1 wherein the nanostructure elements have an aspect ratio greater than 3.

4. A low energy surface composite comprising A nanostructured film having a surface which when brought in contact with a liquid has an advancing and a receding contact angle for the liquid such that the contact angle hysteresis approaches zero, wherein the nanostructured film comprises a plurality of discrete, elongated nanostructure elements of a first material conformally coated with a second material layer of molecules of an organized molecular assembly creating a surface of a substantially homogeneous chemical functionality and wherein the nanostructure elements have an areal number density of 0.1 to 500/μ

m².

5. The nanostructured film according to claim 4 wherein the organized molecular assembly is a self-assembled monolayer.

6. The nanostructured film according to claim 5 wherein the nanostructure elements have an aspect ratio greater than 3.