HIGH GAS BARRIER THIN FILMS THROUGH PH MANIPULATION OF CLAY

摘要

Bilayers of a polycation and a platelet suspension on a substrate demonstrate significant oxygen barrier properties by altering the pH of the platelet. When the lower pH platelet suspension contacts deposited polycation, more positive charge is created and more platelet suspension is deposited, thereby leading to a thicker film with better gas barrier properties.

主权项

1. A method of preparing an oxygen barrier film, the method comprising:
a. obtaining a substrate; b. exposing the substrate to a polycation solution with a pH of 6 or less to form a first layer; and c. exposing the substrate with the polycation to a platelet solution to form a second layer; wherein the first layer and second layer together form a bilayer; and wherein the oxygen transmission rate of the oxygen barrier film is decreased compared to the oxygen transmission rate of the substrate.