Transparent reusable ultrahigh molecular weight polyethylene air filter
AssigneeThe Hong Kong University of Science and Technology
InventorsPing Gao, Qiao Gu, Shu Kwan Cheung
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Abstract
In particles removal with extremely high filtration efficiency and the ability to block submicron airborne particles by a sieving mechanism is provided. This novel nanoporous filter advantageously combines extremely high transmittance for visible light and ultraviolet light, reusability after cleaning or disinfection by ultraviolet irradiation or simple washing, a customizable sieving pore size ranging from a few nanometers to 500 nanometers, and the ability to carry bactericidal, virucidal or other reagents or particles on the nano or micro scale.
Claims11
A nanoporous nanofilm comprising:
- a nanofilm thickness of less than 1000 nanometers, and
- pores having an average pore size of less than 500 nanometers,
- wherein the nanofilm has a filtration efficiency of greater than 95% for 0.1 μm particles, and
- wherein the nanofilm exhibits a visible light transmittance of greater than 90%.
An ultra-light nanoporous polymer nanofilm with high filtration efficiency, low pressure drop, and extremely high optical transmittance comprising:
- a catalyst made of a silver nanowire, silver nanoparticles, graphene, or iron oxide;
- and
- a porous UHMWPE nanofilm exhibiting:
- a thickness of less than 1000 nanometers,
- an average pore size of less than 500 nanometers
- a filtration efficiency of greater than 95% for 0.1 μm particles,
- a pressure drop of less than 1000 Pa at a fluid velocity of 20 cm/s,
- a visible light transmittance of greater than 90%,
- a Young's modulus of greater than 1.5 GPa, and
- a tensile strength of greater than 800 MPa.
Dependencies are inferred from the claim text.