1. Polytetrafluoroethylene porous membrane, method for producing same and waterproof air-permeable filter

2. However, researchers acknowledge that further investigation is challenging because “the complexity of penguin plumage would be difficult to replicate in a man-made porous membrane or mesh.”

3. The hollow fiber has an Anisotropal porous membrane fistular construction and the ratio of surface area to volume is much larger than for a ultrafiltration membrane, so higher centrifugal force can be exerted, leading to more rapid filtration and more filtrate than can be obtained from traditional centrifugal ultrafiltration

4. Moreover, compared with traditional CF-UF, the hollow fiber has an Anisotropal porous membrane fistular construction, and the ratio of surface area to volume is much larger than for a ultrafiltration membrane, so higher centrifugal force can be exerted, leading to more rapid filtration and more filtrate than can be obtained from traditional