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AssigneesUnited States as Represented by the Secretary of the Army, The UAB Research Foundation
InventorsEugenia P. Kharlampieva, Veronika Koziovskaya, Yun Wang, Donald Cropek, Imee Arcibal
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A novel type of ultrathin cationic hydrogel coatings are provided that have high, quick and reversible swelling/shrinkage transitions and surface wettability in response to pH changes. The poly(4-vinyl pyridine) (PVP) hydrogel films are produced by selective cross-linking of PVP copolymers in layer-by-layer (LbL) films assembled by spin-assisted method. These multilayer hydrogels exhibit drastic and reversible 10-fold swelling when the pH is changed from neutral to acidic. The swelling amplitude of these coatings is controlled by varying cross-link densities within the films. The pH-responsive hydrogels open new prospects for developing “intelligent” materials with sharp stimuli-triggered responses for applications in sensing, transport regulation, and self-cleaning coatings.
A pH-responsive layered composition comprising at least two spin-assisted layer-by-layer spun copolymer layers, wherein the spun layers have a plurality of cross-linkable side-groups attached thereto, and wherein the spun layered composition when hydrated swells when protonated and has a reduced volume when deprotonated.
A pH-responsive spin-assisted layer-by-layer layered composition comprising at least two glutaraldehyde cross-linked spun layers of a copolymer comprising 4-vinylpyridine and having a plurality of amino side-groups attached thereto, and wherein the spun layered composition when hydrated swells when protonated and has a reduced volume when deprotonated.
A method of forming a pH-responsive composition, the method comprising the steps of:
Dependencies are inferred from the claim text.