Tailoring the grafting density of organic modifiers at solid/liquid interfaces
AssigneeNorth Carolina State University
InventorsJan Genzer, Kirill Efimenko
Life of this patent
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Abstract
A method of depositing a functional group on a surface portion of an elastic substrate comprises the steps of: (a) stretching an elastic substrate having an initial surface portion to form an enlarged surface portion from the initial surface portion; then (b) conjugating a functional group on the enlarged surface portion; and then (c) releasing the substrate to form a reduced surface portion from the enlarged surface portion, with the reduced surface portion having an area less than the enlarged surface portion, and with the reduced surface portion having the functional group deposited therein at a greater density than the enlarged surface portion.
Claims38
A method of depositing a functional group on a surface portion of an elastic substrate, comprising the steps of:
- (a) stretching an elastic substrate having an initial surface portion to form an enlarged surface portion from said initial surface portion;
- then
- (b) conjugating a finctional group on said enlarged surface portion;
- and then
- (c) releasing said substrate to form a reduced surface portion from said enlarged surface portion, with said reduced surface portion having an area less than said enlarged surface portion, and with said reduced surface portion having said functional group deposited therein at a greater density than said enlarged surface portion.
A method of depositing a functional group on a surface portion of an elastic substrate, comprising the steps of:
- (a) stretching an elastic substrate having an initial surface portion to form an enlarged surface portion from said initial surface portion, the elastic substrate comprising poly(dimethyl siloxane);
- then
- (b) exposing the enlarged surface portion to a treatment to form a reactive group on the enlarged surface portion, said reactive group selected from the group consisting of a hydroxyl group, a carboxyl group, a peroxide group, and combinations thereof;
- then
- (c) depositing a functional group as a monolayer on the enlarged surface portion to react with the reactive group and chemically modify the enlarged surface portion, the finctional group being selected from the group consisting of M-SiCl3, M-SiCl2(OR), M-SiCl(OR)2, and combinations thereof, wherein M is selected from an aryl-containing group, F(CF2)y1(CH2)x1, or combinations thereof, wherein x1 ranges from 1 to 1,000 and y1 ranges from 1 to 1,000, and wherein R is a hydrocarbon group;
- and then
- (d) releasing said substrate to form a reduced surface portion from said enlarged surface portion, with said reduced surface portion having an area less than said enlarged surface portion, and with said reduced surface portion having said functional group deposited therein at a greater density than said enlarged surface portion.
Dependencies are inferred from the claim text.