Patent ID: 9289727
Filing Date: 2016-03-22
CPC Classification: B01D

Claim Text:
1. A process for fabricating membrane filters, comprising: mixing an aqueous solution containing a metal salt and an aqueous solution containing an alkali to prepare a nanostrand solution comprising a metal hydroxide, filtrating the nanostrand solution through a porous substrate to make an accumulation of fibrous nanostrands on the porous substrate thereby fabricating a nanostrand sheet, and filtering a solution containing organic molecules through the nanostrand sheet to form a filter cake comprising an accumulation of the organic molecules on the nanostrand sheet, the organic molecules being cross-linkable oligomers or cross-linkable polymers, wherein a maximum diameter of a first pore formed by way of gaps between the nanostrands and extending through the nanostrand sheet from one surface side to another surface side is greater than or equal to 3 nm and smaller than or equal to 5 nm, and wherein a maximum diameter of a second pore formed through the filter cake and extending through the filter cake from one surface side to another surface side is greater than or equal to 0.5 nm and smaller than or equal to 5 nm.