Self-assembled magnetic arrays

Patent metadata

Field	Value
Publication number	US-9532729-B2
Application number	US-201113825762-A
Country	US
Kind code	B2
Filing date	Sep 27, 2011
Priority date	Sep 27, 2010
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A magnetic device includes a substrate and an array including a plurality of magnetic particles, in which a magnetic dipole moment direction of each magnetic particle in a majority of the magnetic particles in the array alternates with respect to a magnetic dipole direction of a directly adjacent magnetic particle or directly adjacent magnetic particles in the array.

First claim

What is claimed is:

1. A magnetic device comprising:
a substrate;
an array including a plurality of magnetic particles arranged in a single layer on the substrate, wherein a magnetic dipole moment direction of each magnetic particle in a majority of the magnetic particles alternates with respect to a magnetic dipole direction of a directly adjacent magnetic particle in the array, wherein an average maximum dimension of each particle of the plurality of magnetic particles is between about 50 nm to about 100 microns, and wherein directly adjacent particles within the array are separated by a spacing of 5 nm or less;
a fluid flow channel having a bottom surface arranged adjacent to the array, wherein the magnetic dipole moment direction of each magnetic particle in the majority of the magnetic particles is oriented orthogonal to the bottom surface of the fluid flow channel; and
a chaotic mixer arranged in the fluid flow channel, wherein a structure of the chaotic mixer is arranged and configured to create a fluid force, within a fluid flowing in the fluid channel, in a direction toward the array.

2. The magnetic device according to claim 1 , wherein the magnetic particles in the array comprise permanent magnets.

3. The magnetic device according to claim 1 , wherein the magnetic particles in the array comprise a superparamagnetic material.

4. The magnetic device according to claim 1 , wherein the magnetic particles in the array comprise one or more of NdFeB, SmCo, FePt, and iron oxide.

5. The magnetic device according to claim 1 , further comprising a suspension layer, wherein the array of magnetic particles is located in the suspension layer.

6. The magnetic device according to claim 5 , wherein the suspension layer comprises a curable polymer.

7. The magnetic device according to claim 6 , wherein the polymer comprises polyurethane, epoxy, poly(methyl methacrylate) (PMMA), or polydimethylsiloxane (PDMS).

8. The magnetic device according to claim 1 , further comprising:
a sheet coated with an adhesive that adheres to the array of magnetic particles.

9. The magnetic device according to claim 1 , wherein the plurality of magnetic particles in the array is close-packed.

10. The magnetic device according to claim 1 , further comprising a plurality of fluid flow channels arranged adjacent to the array.

Assignees

• Weissleder Ralph
• Lee Hakho
• Issadore David
• Massachusetts Gen Hospital

Inventors

• Weissleder Ralph
• Lee Hakho
• Issadore David

Classifications

• H01F1/009 Primary

  bidimensional, e.g. nanoscale period nanomagnet arrays (H01F10/007 takes precedence) · CPC title

• A61B5/055 Primary

  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging · CPC title

• G01R33/383

  using permanent magnets · CPC title

• B03C1/0332

  using permanent magnets · CPC title

• B03C1/288

  disposed at the outer circumference of a recipient · CPC title