Magnetic nanoparticles embedded in polymer microparticles
Various aspects disclosed relate to hybrid nanoparticles embedded in non-magnetic microparticles. These materials can be used to directionally orient and impart an ordered structure to a variety of materials.
1. A particle (P) comprising:
a plurality of magnetic inorganic or organic particles (P1) embedded in at least one microparticle (P2), the microparticle (P2) comprising at least one polymeric material, wherein
the magnetic inorganic or organic particles (P1) have an average size of from about 10 nm to about 5000 nm,
the polymeric material comprises a thermoplastic resin comprising a polyetherimide, polycarbonate, polyether ether ketone, polyethersulfone, or combinations thereof, and
the average size of the particle (P) is from about 0.25 μm to about 75 μm.
2. The particle (P) of claim 1 , wherein the magnetic inorganic or organic particles (P1) comprise a metal oxide.
3. The particle (P) of claim 2 , wherein the metal oxide is NiO, Fe 2 O 3 , Fe 3 O 4 , MoO 3 , CeO 2 , Y 2 O 3 , TiO 2 , or combinations thereof.
4. The particle (P) of claim 1 , wherein the magnetic inorganic or organic particles (P1) respond to a magnetic field.
5. The particle (P) of claim 1 , wherein the magnetic inorganic or organic particles (P1) comprise from about 0.01% to about 25% w/w of the microparticle (P2).
6. The particle (P) of claim 1 , wherein the magnetic inorganic or organic particles (P1) have an average size of from about 10 nm to about 1000 nm.
7. The particle (P) of claim 2 , further comprising additional metal oxides selected from the group consisting of Al 2 O 3 , ZrO 2 , MgO, ZnO, and combinations thereof.
8. The particle (P) of claim 1 , wherein the average size of the particle (P) is from about 1 μm to about 75 μm.
9. The particle (P) of claim 1 , wherein the magnetic inorganic or organic particles (P1) are homogenously distributed throughout the microparticle (P2).
10. The particle (P) of claim 1 , wherein the magnetic inorganic or organic particles (P1) are substantially embedded in the microparticle (P2).
11. The particle (P) of claim 1 , wherein the magnetic inorganic or organic particles (P1) are at least partially disposed on the surface of the microparticle (P2).
12. The particle (P) of claim 11 , wherein the magnetic inorganic or organic particles (P1) cover from about 0.1% to about 50% of the surface area of the microparticle (P2).
13. A method of making the particle (P) of claim 1 , comprising:
contacting an aqueous composition comprising at least one surfactant with a solution of the at least one polymeric material dissolved in an organic solvent; and
emulsifying the aqueous composition and the solution to form a dispersion of organic droplets comprising the least one polymeric material and the magnetic inorganic or organic particles (P1);
wherein the magnetic inorganic or organic particles (P1) are dispersed in the aqueous composition or in the organic solvent.
14. The method of claim 13 , wherein the aqueous composition comprises deionized water.
15. The method of claim 13 , wherein the at least one surfactant comprises an ionic or non-ionic surfactant.
16. The method of claim 13 , wherein the magnetic inorganic or organic particles (P1) are dispersed in the aqueous composition.
17. The method of claim 13 , wherein the magnetic inorganic or organic particles (P1) are dispersed in the organic solvent.
18. The method of claim 13 , further comprising:
removing the organic solvent to form an aqueous dispersion of polymer particles (P) comprising the least one polymeric material and the magnetic inorganic or organic particles (P1).
19. A particle (P) comprising:
from about 0.01% to about 25% w/w of an iron oxide particle (P1) that responds to a magnetic field embedded in a polyetherimide microparticle (P2), wherein the iron oxide particle (P1) has an average size of from about 10 nm to about 5000 nm.
20. The particle (P) of claim 19 , wherein the iron oxide particle (P1) has an average size of from about 10 nm to about 1000 nm.