Porous membrane patterning technique
View Patent ↗A porous membrane patterning technique is provided. In one embodiment, a porous membrane may be patterned via printing on the porous membrane with a solvent such that the porous membrane collapses where the solvent is applied. In another embodiment, a patterned porous membrane may be formed by casting a solution including at least components of the porous membrane into voids of a casting plate or stencil, removing the casting plate, and letting the remaining components go through a phase inversion process to form porous membrane regions.
1. A method for patterning a porous membrane, comprising:
receiving an input comprising a pattern, wherein the pattern defines a closed flow area; and
controlling a printer to apply a solvent to a surface of a porous membrane in the desired pattern such that the porous membrane collapses where the solvent is applied.
2. The method of claim 1 , wherein the pattern is a repeating pattern.
3. The method of claim 1 , wherein the pattern comprises at least one collapsed region having a thickness of 0.02 mm to 0.35 mm.
4. The method of claim 1 , wherein the flow area comprises at least one branch or arm terminating in a larger reservoir.
5. The method of claim 1 , wherein the porous membrane is a nitrocellulose membrane.
6. The method of claim 1 , wherein the porous membrane is disposed only on certain portions of a substrate.