Structure for molecular separations

1. An assembly for producing a structure for molecular separations comprising:

a substrate;

a plurality of template materials positioned on the substrate, the template materials being double-stranded DNA molecules, the template materials positioned in an arrangement for leaving pores suitable for molecular separations when the template materials are removed, such that the pores formed by the double-stranded DNA molecules are substantially uniform in width along their length; and

a sieve material positioned on the substrate around the template materials, the sieve material having a composition and being shaped for producing the structure for molecular separations after removal of the template materials.

2. The assembly of claim 1 wherein the substrate has a surface upon which the sieve material is shaped to produce a membrane for molecular separations.

3. The assembly of claim 2 wherein the membrane produced is a first membrane and the substrate is a second membrane.

4. The assembly of claim 1 further comprising catalytic materials attached to the template materials.

5. The assembly of claim 4 wherein the catalytic materials are transitions metals.

6. The assembly of claim 4 wherein the catalytic materials are metal atoms, metal ions or metal oxides.

7. The assembly of claim 2 wherein the membrane has opposing major surfaces.

8. The assembly of claim 7 wherein the pores extend generally perpendicular to the opposing major surfaces.

9. The assembly of claim 7 wherein the pores extend through the membrane between the opposing major surfaces.

10. The assembly of claim 2 wherein the membrane has a thickness within a range of from about 0.1 micron to about 100 microns.

11. The assembly of claim 1 wherein the sieve material is a ceramic material.

12. A process of producing a structure for molecular separations comprising:

providing an assembly comprising:

a substrate;

a plurality of template materials positioned on the substrate, the template materials being double-stranded DNA molecules, the template materials positioned in an arrangement for leaving pores suitable for molecular separations when the template materials are removed, such that the pores formed by the double-stranded DNA molecules are substantially uniform in width along their length; and

a sieve material positioned on the substrate around the template materials, the sieve material having a composition and being shaped for producing the structure for molecular separations after removal of the template materials; and

removing the template materials to leave pores in the sieve material that are substantially uniform in width along their length, thereby producing the structure suitable for molecular separations.

13. The process of claim 12 wherein the sieve material is formed into a membrane and the template materials are positioned to leave substantially aligned pores in the membrane.

14. The process of claim 13 wherein the template materials are attached to a surface of the substrate and the sieve material is applied onto the surface and around the template materials to form the membrane.

15. The process of claim 13 wherein the membrane has opposing major surfaces.

16. The process of claim 15 wherein the pores extend generally perpendicular to the opposing major surfaces.

17. The process of claim 15 wherein the pores extend through the membrane between the opposing major surfaces.

18. The process of claim 13 wherein the membrane has a thickness within a range of from about 0.1 micron to about 100 microns.

19. The process of claim 12 wherein the sieve material produces a ceramic structure.

20. The process of claim 12 further comprising, after removing the template materials, reducing the diameter of the pores in a controlled fashion.

21. The process of claim 12 further comprising attaching catalytic materials to the template materials, and leaving the catalytic materials attached to the pores when the template materials are removed.

22. The process of claim 21 wherein the catalytic materials are transitions metals.

23. The process of claim 21 wherein the catalytic materials are metal atoms, metal ions or metal oxides.