Zeolite nanosheet membrane
Oxide materials, thin films, coatings, and methods of preparing the same are disclosed herein. In certain embodiments the oxide material can have an MWW type framework or an MFI type framework. In one embodiment, the method includes: providing a suspension of an exfoliated layered oxide material in a solvent; and filtering the suspension through a porous support to provide a film of the oxide material, optionally directly on the porous support. Secondary grown films of the oxide material and methods of preparing the same are also provided. Thin zeolite films are attractive for a wide range of applications including molecular sieve membranes and catalytic membrane reactors, permeation barriers, low dielectric constant materials for microelectronics and sensor components for selective sensing.
1. A method of making a film of a zeolite, the method comprising:
providing a composite comprising a layered zeolite having an MFI type framework and a polymer, wherein the layers of the zeolite are exfoliated by the polymer;
contacting the composite with a solvent under conditions effective to dissolve the polymer and provide a suspension of nanosheets of the zeolite in the solvent to provide a suspension of an exfoliated layered zeolite having an MFI type framework in a solvent; and
filtering the suspension through a porous support to provide a film of the zeolite on the porous support.
2. The method of claim 1 further comprising calcining the zeolite at a temperature of 400° C. to 700° C. for 1 hour to 48 hours.
3. The method of claim 1 wherein conditions effective further comprise sonicating the nanosheets of the zeolite in the solvent to disperse the nanosheets in the solvent.
4. The method of claim 1 wherein providing the composite comprising the layered zeolite and the polymer comprises:
providing a layered zeolite; and
melt blending the layered zeolite with the polymer.
5. The method of claim 1 wherein the polymer is selected from the group consisting of polystyrene, polypropylene, a polyolefin, a polymethacrylate, polyvinylalcohol, a polyacrylamide, a polycaprolactone, a copolymer of ethylene, a copolymer of propylene, a copolymer of acetate, poly(ethylene terephthalate), a nylon, a polysulfone, a polyimide, a polyamidimide, a polybenzaimidazole, and combinations thereof.
6. The method of claim 1 wherein conditions effective to dissolve the polymer comprise a temperature of no greater than 200° C.
7. The method of claim 1 wherein conditions effective to dissolve the polymer comprise a temperature of no greater than 100° C.
8. The method of claim 1 wherein conditions effective to dissolve the polymer comprise a temperature of about room temperature.
9. The method of claim 1 wherein the solvent is an organic solvent.