Magneto-dielectric polymer nanocomposites

Patent metadata

Field	Value
Publication number	US-9666342-B2
Application number	US-201615160233-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	May 27, 2010
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

In accordance with the present invention, novel superparamagnetic magneto-dielectric polymer nanocomposites are synthesized using a novel process. The tunability of the dielectric/magnetic properties demonstrated by this novel highly-viscous solvent-free polymer nanocomposite that is amenable to building 3D electromagnetic structures/devices by using processes such as 3D printing, compression molding or injection molding, when an external DC magnetic field is applied, exceeds what has been previously reported for magneto-dielectric polymer nanocomposite materials.

First claim

What is claimed is:

1. A superparamagnetic polymer nanocomposite material comprising:
a solvent-free low-loss polymer; and
single-domain magnetic Fe 3 O 4 nanoparticles having a mean size of 8 nm±1 nm coated with a surfactant and substantially uniformly dispersed in the solvent-free low-loss polymer at a concentration between 30% w/w and 80% w/w, forming a superparamagnetic polymer nanocomposite material.

2. The superparamagnetic polymer nanocomposite material of claim 1 , wherein a relative magnetic permeability of the superparamagnetic polymer nanocomposite material is greater than about 1.6 and the relative electric permittivity of the superparamagnetic polymer nanocomposite material is greater than about 5.5 for a frequency between 1 GHz and 6 GHz and under an applied DC magnetic field of approximately 1 kOe.

3. The superparamagnetic polymer nanocomposite material of claim 1 , wherein a dielectric loss tangent of the superparamagnetic polymer nanocomposite material is less than or equal to about 0.05 for a frequency between 1 GHz and 6 GHz and under an applied DC magnetic field of approximately 1 kOe.

4. The superparamagnetic polymer nanocomposite material of claim 1 , wherein a magnetic loss tangent of the superparamagnetic polymer nanocomposite material is less than or equal to about 0.05 for a frequency between 1 GHz and 6 GHz and under an applied DC magnetic field of approximately 1 kOe.

5. The superparamagnetic polymer nanocomposite material of claim 1 , wherein the nanocomposite material forms a 20 μm-thick film on a substrate.

6. The polymer nanocomposite material of claim 1 , wherein the concentration is 30% w/w.

7. The polymer nanocomposite material of claim 1 , wherein the concentration is 50% w/w.

8. The superparamagnetic polymer nanocomposite material of claim 1 , wherein the surfactant is selected from oleylamine and oleic acid.

9. The superparamagnetic polymer nanocomposite material of claim 1 , wherein the solvent-free low-loss polymer comprises a copolymer and butadiene resin.

10. The superparamagnetic polymer nanocomposite material of claim 1 , wherein the nanocomposite material forms a 3D freestanding structure.

11. The superparamagnetic polymer nanocomposite material of claim 1 , wherein the concentration is 80% w/w.

12. A superparamagnetic polymer nanocomposite material comprising:
a solvent-free low-loss polymer; and
single-domain magnetic CoFe 2 O 4 nanoparticles having a mean size of approximately 10 nm±1 nm coated with a surfactant and substantially uniformly dispersed in the solvent-free low-loss polymer at a concentration between 30% w/w and 80% w/w, forming a superparamagnetic polymer nanocomposite material.

13. The superparamagnetic polymer nanocomposite material of claim 12 , wherein the concentration is 30% w/w.

14. The superparamagnetic polymer nanocomposite material of claim 12 , wherein the concentration is 50% w/w.

15. The superparamagnetic polymer nanocomposite material of claim 12 , wherein the concentration is 80% w/w.

16. The superparamagnetic polymer nanocomposite material of claim 12 , wherein the single-domain nanocomposite material forms a 20 μm-thick film on a substrate.

Assignees

• Weller Thomas
• Wang Jing
• Srikanth Hariharan
• Morales-Silva Cesar A
• Repa Kristen L S
• Pal Susmita
• Univ South Florida

Inventors

• Weller Thomas
• Wang Jing
• Srikanth Hariharan
• Morales-Silva Cesar A
• Repa Kristen L S
• Pal Susmita

Classifications

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08K9/10

  Encapsulated ingredients · CPC title

• H01B3/441

  from alkenes · CPC title

• H01B3/006

  Other inhomogeneous material · CPC title