Processing

Please wait...

Settings

Settings

Goto Application

1. WO2020180999 - HIGH VERDET CONSTANT NANOPARTICLES AND METHODS FOR PRODUCING AND USING THE SAME

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

What is Claimed is:

1. A polymeric composition comprising a plurality of magnetic nanocomposite particles interspersed therein, wherein each of said magnetic nanocomposite particle comprises a magnetic nanoparticle having a plurality of organic polymer ligands attached to its surface, and wherein said polymeric composition has the Verdet constant of at least 5,000 °/T-m at 1310 nm wavelength.

2. The polymeric composition of claim 1, wherein the amount of said magnetic nanocomposite particles in said polymeric composition ranges from about 0.1 % by weight to about 50 % by weight.

3. The polymeric composition of claim 1, wherein said magnetic nanoparticle comprises a metal oxide nanoparticle, a complex metal oxide nanoparticle, or a combination thereof.

4. The polymeric composition of claim 3, wherein said magnetic nanoparticle comprises a paramagnetic metal ion, a ferromagnetic metal, or a combination thereof.

5. The polymeric composition of claim 4, wherein said magnetic nanoparticle comprises cobalt ferrite, iron oxide, or a combination thereof.

6. The polymeric composition of claim 1, wherein the amount of said organic polymer ligands attached to each of said magnetic nanoparticle is at least about 90% by weight.

7. The polymeric composition of claim 6, wherein the amount of said organic polymer ligands attached to each of said magnetic nanoparticle is at least about 95% by weight.

8. The polymeric composition of claim 6, wherein the thickness of said organic polymer ligands attached to each of said magnetic nanoparticle is at least about 2 nm.

9. The polymeric composition of claim 1, wherein said magnetic nanocomposite particles are homogeneously interspersed within said polymeric composition.

10. The polymeric composition of claim 1, wherein the average interparticle spacing between said magnetic nanocomposite particles is at least about 10 nm.

11. The polymeric composition of claim 1, wherein the mean particle size of said magnetic nanoparticle is from about 2 nm to about 100 nm.

12. The polymeric composition of claim 1, wherein the d50 mean particle size of said magnetic nanoparticle is about 5 nm.

13. The polymeric composition of claim 1, wherein the thickness of said organic polymer ligand is covalently attached to the surface of said magnetic nanoparticle.

14. The polymeric composition of claim 1, wherein said organic polymer ligand comprises poly(methyl methacrylate), polystyrene, polymethacrylates, DOPA, or a combination thereof.

15. The polymeric composition of claim 1, wherein said polymeric composition has at least about 5% transparency in the wavelength from about 400 nm to about 700 nm.

16. The polymeric composition of claim 1, wherein said polymeric composition has at least about 5% transparency in the wavelength from about 700 nm to about 1550 nm.

17. A magneto-optical device comprising a unit of magnetic nanocomposite particle of claim 1.

18. The magneto-optical device of claim 17, wherein said magneto-optical device is selected from the group consisting of a magneto-optical isolator, a magnetic-field sensor, a magnetic photonic crystal, a magnetic data-recording device, magneto-optical circulator, magneto-optical modulator, magneto-optical switch, and a magnetometer.

19. A method for producing a magnetic nanocomposite particle comprising a magnetic metallic nanoparticle and a plurality of organic polymers attached to the surface of said magnetic metallic nanoparticle, said method comprising:

reacting a magnetic nanocomposite particle comprising a plurality of first organic ligands with a second organic ligand under conditions sufficient to produce a magnetic nanocomposite particle comprising a plurality of said second organic ligand attached on the surface of said magnetic metallic nanoparticle; and reacting said magnetic nanocomposite particle comprising a plurality of said second

organic ligand with a polymerizing agent under conditions sufficient to produce

said magnetic nanocomposite particle comprising said plurality of organic polymers attached to the surface.

20. The method of claim 19, wherein said polymerization comprises atom transfer radical polymerization reaction.

21. The method of claim 19, wherein said magnetic metallic nanoparticle has a mean particle size in the range of from about 5 nm to about 50 nm.

22. The method of claim 19, wherein the total amount of said organic polymers attached to the surface of said magnetic metallic is at least about 99% by weight of said magnetic nanocomposite particle.

23. The method of claim 19, wherein said second organic ligand comprises a polymerizable functional group that is adapted for a surface initiated polymerization reaction with said polymerizing agent.

24. The method of claim 23, wherein said polymerizable function group comprises a halogenated alkyl group.

25. The method of claim 19, wherein said magnetic nanocomposite particle has the Verdet constant of at least 5000 °/T-m at 1550 nm wavelength.

26. A solid substrate comprising (i) a solid substrate layer and (ii) a plurality of thin layers of a polymeric composition of claim 1, wherein each thin layer of said polymeric composition of claim 1 is separated by a separation film.

27. The solid substrate of claim 26, wherein said solid substrate layer comprises a material selected from the group consisting of glass, cellulose acetate, polystyrene,

polycarbonate, polyacrylate, polymethacrylate, polyester, polyimide, polyamide, polycarbonate, perfluoropolymer, cyclic olefmic copolymer, and a cellulose derived polymer.

28. The solid substrate of claim 26, wherein each thin layer of said polymeric composition of claims 1 has a thickness ranging from about 2 nm to about 2 mm.

29. A method for producing a solid substrate of claim 28, said method comprising:

(a) placing a solution of said polymeric composition of claim 1 in a solvent to the surface of said solid substrate layer;

(b) evaporating the solvent to produce a layer of said polymeric composition of claim i ;

(c) placing a solution of a separation film material in a solvent to said layer of

polymeric composition of claim 1 produced in said step (b);

(d) evaporating the solvent to produce a separation film on top of said layer of

polymeric composition of claim 1;

(e) placing another solution of said polymeric composition of claim 1 in a solvent to said separation film produced in said step (d);

(f) evaporating the solvent to produce another layer of said polymeric composition of claim 1; and

(g) optionally repeating said steps (c) and (f) to produce a desired number of said polymeric composition of claim 1 layers on said solid substrate layer.