초록 ▼

A method for forming filtration members using an electric potential to control the migration of electrically charged particles and hence to control the formation of a membrane layer on a substrate. In one embodiment, electrophoresis and electrodialysis processes are used to control the migration of

A method for forming filtration members using an electric potential to control the migration of electrically charged particles and hence to control the formation of a membrane layer on a substrate. In one embodiment, electrophoresis and electrodialysis processes are used to control the migration of sol particles and the deposition of the sol particles to provide a desired pore size associated with the membrane layer. In another embodiment, the substrate pores are impregnated with a reagent and, subsequently, electrophoresis and "reverse" electrophoresis processes are utilized to control the diffusion of ions in connection with the formation of the membrane layer.

대표청구항 ▼

[ What is claimed is:] [1.] A method for producing a filtration member, comprising:positioning a porous, conductive substrate having a thickness in a vessel containing a liquid medium means, said substrate also having an operating side and an opposing side and with said thickness therebetween;dispos

[ What is claimed is:] [1.] A method for producing a filtration member, comprising:positioning a porous, conductive substrate having a thickness in a vessel containing a liquid medium means, said substrate also having an operating side and an opposing side and with said thickness therebetween;disposing a first electrode in said liquid medium means on said operating side;disposing a second electrode in said liquid medium means on said opposing side;applying a first voltage potential relative to said substrate and said first electrode;applying a second voltage potential relative to said substrate and said second electrode, andforming a membrane layer on said substrate with said membrane layer having pores of a desired pore size, said forming step including diffusing electrically charged particles through said thickness of said substrate from said opposing side using at least one of said first and second voltage potentials and also including neutralizing particle charges adjacent said operating side using said electrically charged particles.