| abstract |
An asymmetric membrane, the asymmetric membrane comprising: a first asymmetric porous zone comprising a first porous asymmetry that increases with passing from the first outer surface through the first porous zone of the body; And a second asymmetric porous zone comprising a second porous asymmetry that increases as it passes through the second porous zone of the body from the second outer surface, wherein the first average pore size is greater than the second average pore size. A membrane, a method of making this membrane, and a method of using the membrane are disclosed. |