Micro-machined filter for magnetic particles

Patent metadata

Field	Value
Publication number	US-2021106933-A1
Application number	US-202017130029-A
Country	US
Kind code	A1
Filing date	Dec 22, 2020
Priority date	Sep 13, 2018
Publication date	Apr 15, 2021
Grant date	—

Abstract

A method for filtering magnetic particles includes spinning a filter including a plurality of pores within a substrate. The method further includes applying, subsequent to spinning the filter, an external magnetic field to the filter. The method includes disposing a solution including a first particle and a second particle onto the filter. The first particle includes a magnetic particle of interest. The method further includes separating the first particle from the second particle by capturing the first particle within a pore of the plurality of pores within the substrate.

First claim

What is claimed is:

1 . A filter system for filtering magnetic particles comprising:
a micro-machined filter comprising a plurality of pores within a substrate; a chamber comprising a surface for spinning the filter; and a magnetic field generating device for applying a magnetic field to the filter.

2 . The filter system of claim 1 , wherein the substrate comprises a semiconductor material.

3 . The filter system of claim 2 , wherein the semiconductor material is silicon.

4 . The filter system of claim 1 , wherein the substrate comprises a dielectric material.

5 . The filter system of claim 4 , wherein the dielectric material comprises glass.

6 . The filter system of claim 1 , wherein the substrate comprises a non-magnetic material.

7 . The filter system of claim 1 , wherein pores of the plurality of pores have a plurality of widths.

8 . The filter system of claim 1 , wherein a pore of the plurality of pores has a width that is greater than a magnetic particle of interest.

9 . The filter system of claim 1 , wherein the magnetic particles are iron, nickel, cobalt, or an alloy thereof.

10 . A micro-machined filter for filtering magnetic particles, the micro-machined filter comprising:
a plurality of pores within a substrate; and a magnetic liner arranged on sidewalls of pores of the plurality of pores; and wherein a pore of the plurality of pores has a width that is greater than a magnetic particle of interest, such that the magnetic particle of interest binds to the magnetic liner within the pore.

11 . The micro-machined filter of claim 10 , wherein the substrate is a semiconductor material.

12 . The micro-machined filter of claim 11 , wherein the semiconductor material is silicon.

13 . The micro-machined filter of claim 10 , wherein the substrate is a dielectric material.

14 . The micro-machined filter of claim 13 , wherein the dielectric material is glass.

15 . The micro-machined filter of claim 10 , wherein the substrate is a non-magnetic material.

16 . The micro-machined filter of claim 10 further comprising a coating comprising a ligand for the magnetic particle of interest.

17 . The micro-machined filter of claim 14 , wherein magnetic particle of interest binds to the ligand.

18 . The micro-machined filter of claim 10 , wherein the magnetic liner comprises iron, nickel, cobalt, or an alloy thereof.

19 . The micro-machined filter of claim 10 , wherein the magnetic particle comprises iron, nickel, cobalt, or an alloy thereof.

20 . The micro-machined filter of claim 10 , wherein pores of the plurality of pores have a plurality of widths.

Assignees

• IBM

Inventors

• Khan Babar
• Kinser Emily R

Classifications

• B03C1/288

  disposed at the outer circumference of a recipient · CPC title

• B01D39/2003

  Glass or glassy material · CPC title

• B01D39/1692

  Other shaped material, e.g. perforated or porous sheets · CPC title

• B03C2201/22

  characterised by the magnetic field, e.g. its shape or generation · CPC title

• B03C2201/18

  Magnetic separation whereby the particles are suspended in a liquid · CPC title