Polyelectrolyte multilayer films at liquid-liquid interfaces
The present invention is directed to methods for providing a polyelectrolyte multilayer film at a liquid-liquid interface. Such methods include steps of sequentially-depositing layers of cationic and anionic polyelectrolytes at a liquid-liquid interface that is formed between immiscible first and second liquids whereby a polyelectrolyte multilayer film is provided at the liquid-liquid interface. In certain preferred embodiments, the first liquid is an aqueous solution and the second liquid is a liquid crystal. In alternative embodiments, the first liquid is an aqueous solution and the second liquid is an oil. The invention further encompasses polyelectrolyte multilayer films provided by the disclosed methods as well as applications utilizing such materials.
1. A polyelectrolyte multilayer film positioned at a liquid-liquid interface between two immiscible liquids, comprising a polyelectrolyte multilayer film having sequentially-deposited layers of cationic and anionic polyelectrolytes wherein said polyelectrolyte multilayer film is positioned between immiscible first and second liquids, and wherein said first liquid is an aqueous solution and said second liquid is a liquid crystal.
2. The polyelectrolyte multilayer according to claim 1 wherein the liquid crystal is in the form of a droplet.
3. The polyelectrolyte multilayer according to claim 1 wherein the first liquid is in the form of a droplet.
4. A modified liquid crystal comprising a liquid crystal and a polyelectrolyte multilayer film deposited on said liquid crystal.
5. The modified liquid crystal according to claim 4 wherein the polyelectrolyte multilayer film is deposited directly on the liquid crystal.
6. The modified liquid crystal according to claim 4 wherein the polyelectrolyte multilayer film includes an excipient capable of interacting with an analyte present in an aqueous phase contacted with the polyelectrolyte multilayer film, said interacting causing a change in the orientation or ordering of the liquid crystal.
7. The modified liquid crystal according to claim 4 wherein the liquid crystal is in the form of a droplet.
8. A liquid crystal device, comprising:
(a) a container;
(b) a liquid crystal disposed within said container; and
(c) a polyelectrolyte multilayer film deposited on a surface of the liquid crystal.