Composite membrane with integral rim
View Patent ↗Composite membranes that are adapted for separation, purification, filtration, analysis, reaction and sensing. The composite membranes can include a porous support structure having elongate pore channels extending through the support structure. The composite membrane also includes an active layer comprising an active layer material, where the active layer material is completely disposed within the pore channels between the surfaces of the support structure. The active layer is intimately integrated within the support structure, thus enabling great robustness, reliability, resistance to mechanical stress and thermal cycling, and high selectivity. Methods for the fabrication of composite membranes are also provided.
1. A planar composite membrane, comprising:
a planar porous support structure comprising anodic aluminum oxide and having a first major surface and a mutually opposed second major surface, the porous support structure comprising substantially parallel elongate pore channels extending through the support structure from the first major surface to the second major surface;
an active layer comprising an active layer material, the active layer being disposed within the elongate pore channels between the first major surface and the second major surface; and
an aluminum rim integrally formed with an outer peripheral edge of said porous support structure, wherein the aluminum rim is directly bonded to the porous support structure without the use of an intermediate bonding material.
2. The composite membrane recited in claim 1 , wherein said active layer is completely disposed within the elongate pore channels.
3. The composite membrane recited in claim 2 , wherein said active layer is spaced inwardly from each of said first and second major surfaces.
4. The composite membrane recited in claim 3 , wherein said active layer is spaced inwardly from each of said first and second major surfaces by at least about 1 nm.
5. The composite membrane recited in claim 1 , wherein said porous support structure has an average thickness of at least about 0.1 μm and not greater than about 500 μm.
6. The composite membrane recited in claim 1 , wherein said active layer has a thickness of not greater than about 5 μm.
7. The composite membrane recited in claim 1 , wherein said active layer comprises Pd.
8. The composite membrane recited in claim 2 , wherein said active layer comprises Pd alloyed with at least one element selected from Cu and Ag.
9. The composite membrane recited in claim 1 , wherein said active layer comprises an amorphous metal alloy.
10. The composite membrane recited in claim 1 , wherein said active layer comprises a first active layer material and a second active layer material that is different than said first active layer material.
11. The composite membrane recited in claim 10 , wherein said first active layer material is adapted to separate a gas species.
12. The composite membrane recited in claim 11 , wherein said second active layer material is a catalytic material.
13. The composite membrane recited in claim 1 , wherein the porous support structure and the aluminum rim are integrally formed by the anodization of a single sheet of aluminum foil.