Micro-machined filter for magnetic particles

Patent metadata

Field	Value
Publication number	US-12263423-B2
Application number	US-202318318762-A
Country	US
Kind code	B2
Filing date	May 17, 2023
Priority date	Sep 13, 2018
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

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, the filter system comprising:
a micro-machined filter comprising:
a plurality of pores within a substrate; and
a magnetic liner arranged on sidewalls and a bottommost surface of pores of the plurality of pores;
a coating directly on the magnetic liner, the coating comprising a ligand for the magnetic particle of interest, the ligand positioned such that the magnetic liner is between the ligand and the sidewalls or bottommost surface of the 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.

2. The filter system of claim 1 , wherein the substrate is 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 is a dielectric material.

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

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

7. The filter system of claim 1 , wherein the magnetic particle of interest binds to the ligand.

8. The filter system of claim 1 , wherein the magnetic liner comprises iron, nickel, cobalt, or an alloy thereof.

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

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

11. The filter system of claim 1 , further comprising a chamber coupled to the micro-machined filter.

12. The filter system of claim 11 , wherein the chamber comprises a surface for spinning the micro-machined filter about an axis arranged substantially perpendicular to the surface.

13. The filter system of claim 12 , wherein the chamber is capable of adjusting a spin speed of the micro-machined filter from about 10 revolutions per minute (RPM) to about 50,000 RPM at a spin acceleration of about 10 to about 5000 RPM per second.

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

• B01D39/20

  of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires (porous ceramic material {C04B38/00} ; sintering metals C22C1/04; {making porous sintered metal bodies B22F3/10, honeycomb filters B01D46/2418, materials used for filtering exhaust gases of an internal combustion engine F01N3/022, ceramic honeycomb structures C04B38/0006}) · CPC title

• B03C2201/18

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