Surface functionalized Langmuir-Blodgett films for immobilization of active moieties
First Claim
1. A process for chemically modifying a hydrophobic surface of a Langmuir-Blodgett film so as to make said surface hydrophilic, said process comprising:
- a. providing a Langmuir-Blodgett film having a hydrophobic surface of omega unsaturated covalent bonds formed from an amphiphilic, bifunctional surface active material having a hydrophobic tail group bearing an omega terminus of double or triple bonded unsaturation; and
b. exposing the hydrophobic surface of the Langmuir-Blodgett film to a reagent which reacts with the surface of the Langmuir-Blodgett film for a time sufficient so as to oxidize said omega unsaturated covalent bonds to provide hydrophilic groups on said surface thus providing a hydrophilic surface on the Langmuir-Blodgett film.
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Abstract
Langmuir-Blodgett films having hydrophobic surfaces are chemically modified to convert the hydrophobic surfaces to hydrophilic surfaces for immobilization of active moieties having bioactive, immunoactive, thermoactive, electroactive, optoactive or redoxactive properties. Langmuir-Blodgett films having a hydrophobic surface of omega unsaturated covalent bonds are formed from an amphiphilic, bifunctional surface active material having a hydrophobic tail group bearing an omega terminus of double or triple bonded unsaturation. The amphiphilic material may be fatty acids, phospholipids or porphyrins, and is preferably omega-tricosenoylamide or omega-tricosenoic acid. Chemical modification is carried out by exposing the hydrophobic surface to a reagent such as alkaline or acidic potassium permanganate, potassium dichromate or osmium tetroxide which oxidizes the omega unsaturated covalent bonds to provide hydrophilic groups such as hydroxyl or carboxylic acid groups. These groups make the film surface hydrophilic and function as sites for attachment of the active moieties.
29 Citations
48 Claims
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1. A process for chemically modifying a hydrophobic surface of a Langmuir-Blodgett film so as to make said surface hydrophilic, said process comprising:
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a. providing a Langmuir-Blodgett film having a hydrophobic surface of omega unsaturated covalent bonds formed from an amphiphilic, bifunctional surface active material having a hydrophobic tail group bearing an omega terminus of double or triple bonded unsaturation; and b. exposing the hydrophobic surface of the Langmuir-Blodgett film to a reagent which reacts with the surface of the Langmuir-Blodgett film for a time sufficient so as to oxidize said omega unsaturated covalent bonds to provide hydrophilic groups on said surface thus providing a hydrophilic surface on the Langmuir-Blodgett film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A process for preparing a Langmuir-Blodgett film/supra-molecular complex, said process comprising:
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a. providing a Langmuir-Blodgett film having a hydrophobic surface of omega unsaturated covalent bonds formed from an amphiphilic, bifunctional surface active material having a hydrophobic tail group bearing an omega terminus of double or triple bonded unsaturation; b. exposing the hydrophobic surface of the Langmuir-Blodgett film to a reagent which reacts with the surface of the Langmuir-Blodgett film for a time sufficient so as to oxidize said omega unsaturated covalent bonds on said surface so as to form hydroxyl or carboxylic acid groups thus providing a hydrophilic surface on the Langmuir-Blodgett film; and c. exposing the hydrophilic surface of the Langmuir-Blodgett film to a chemical reagent that is active to the surface of the film for a time sufficient to provide immobilization of the chemical reagent on the film surface, to thereby result in the creation of a Langmuir-Blodgett film/supra-molecular complex.
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29. A Langmuir-Blodgett film/supra-molecular complex prepared by the following steps:
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a. providing a Langmuir-Blodgett film having a hydrophobic surface of omega unsaturated covalent bonds formed from an amphiphilic, bifunctional surface active material having a hydrophobic tail group bearing an omega terminus of double or triple bonded unsaturation; b. exposing the hydrophobic surface of said Langmuir-Blodgett film to reagents which react with the surface of the Langmuir-Blodgett film for a time sufficient so as to oxidize said omega unsaturated covalent bonds so as to form hydroxyl or carboxylic acid groups on said surface thus providing a hydrophilic surface on the Langmuir-Blodgett film; and c. exposing the hydrophilic surface of the Langmuir-Blodgett film to an additional chemical reagent that is active to the surface of the film for a time sufficient to provide immobilization of the additional chemical reagent on the film surface to result in a Langmuir-Blodgett film/supra-molecular complex. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A process for chemically modifying a hydrophobic surface of a Langmuir-Blodgett film so as to provide a hydroxyl or carboxylic acid functionality on said surface, said process comprising:
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a. providing a Langmuir-Blodgett film having a hydrophobic surface of omega unsaturated covalent bonds formed from an amphiphilic, bifunctional surface active material having a hydrophobic tail group bearing an omega terminus of double or triple bonded unsaturation; and
,b. exposing the hydrophobic surface of the Langmuir-Blodgett film to a reagent which reacts with the surface of the Langmuir-Blodgett film for a time sufficient so as to oxidize said omega unsaturated covalent bonds on the surface thus providing a carboxylic acid or hydroxyl functionality on the Langmuir-Blodgett film.
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48. A process for chemically modifying a hydrophobic surface of a Langmuir-Blodgett film so as to make said surface hydrophilic, said process comprising:
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a. providing a Langmuir-Blodgett film having a hydrophobic surface of omega unsaturated covalent bonds, said Langmuir-Blodgett film comprising built-up monolayers of amphilphilic material wherein the amphiphilic material is selected from the group consisting of omega-tricosenoylamide and omega-tricosenoic acid; and b. exposing the hydrophobic surface of the Langmuir-Blodgett film to a regent which reacts with the surface of the Langmuir-Blodgett film for a time sufficient so as to oxidize said omega unsaturated covalent bonds to provide hydrophilic groups on said surface thus providing a hydrophilic surface on the Langmuir-Blodgett film.
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Specification