Highly porous fibrous network materials for gas filtration
First Claim
Patent Images
1. A membrane comprising:
- at least a first substrate layer including a polyolefin modified with at least one ionic compound; and
at least a second layer including a three-dimensional network comprising a material selected from the group consisting of polysaccharide nanofibers, cellulose nanofibers, chitin nanofibers, chitosan nanofibers, polysaccharide nanofibrils, polysaccharide nanostrips, cellulose nanostrips, carbon nanofibers, carbon nanotubes, porous graphene nanosheets, porous graphene oxide nanosheets, bacterial cellulose, and combinations thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
Membranes are provided for filtering a gas, in some cases air. Membranes using a highly porous cellulose nano fibrous barrier layer with a highly porous (surface-charged) substrate can exhibit high flux, high retention, and low pressure drop in air filtration of toxic aromatic gases, fumes, bacteria, viruses, dusts, and particulate matters.
27 Citations
22 Claims
-
1. A membrane comprising:
-
at least a first substrate layer including a polyolefin modified with at least one ionic compound; and at least a second layer including a three-dimensional network comprising a material selected from the group consisting of polysaccharide nanofibers, cellulose nanofibers, chitin nanofibers, chitosan nanofibers, polysaccharide nanofibrils, polysaccharide nanostrips, cellulose nanostrips, carbon nanofibers, carbon nanotubes, porous graphene nanosheets, porous graphene oxide nanosheets, bacterial cellulose, and combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21)
-
-
11. A method of producing a filtration membrane comprising:
-
contacting a porous substrate, including polyolefin with at least one ionic compound, to form a substrate; and applying to the substrate a three-dimensional network including a material selected from the group consisting of polysaccharide nanofibers, cellulose nanofibers, chitin nanofibers, chitosan nanofibers, polysaccharide nanofibrils, polysaccharide nanostrips, cellulose nanostrips, carbon nanofibers, carbon nanotubes, porous graphene nanosheets, porous graphene oxide nanosheets, bacterial cellulose, and combinations thereof, to form the filtration membrane. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 22)
-
Specification