Cellulose nanofibril decorated with magnetic nanoparticles
The present invention relates to cellulose nanofibrils decorated with magnetic nanoparticles as well as a method for the preparation thereof and a material comprising the nanofibrils.
1. A cellulose nanofibril decorated with magnetic nanoparticles that are uniformly distributed on the nanofibril, wherein the nanoparticles are uniformly distributed along the nanofibril at a particle to particle inter-distance of at about the same length as the particle diameter.
2. The cellulose nanofibril according to claim 1 , wherein the magnetic nanoparticle is made of transition metal compounds or an oxide thereof.
3. The cellulose nanofibril according to claim 2 , wherein the magnetic nanoparticle is made of a compound selected from Co, Fe, Ni, Fe 2 O 3 , Fe 3 O 4 , CoFe 2 O 4 , NiFe 2 O 4 , CuFe 2 O 4 , MnFe 2 O 4 , and MgFe 2 O 4 .
4. The cellulose nanofibril according to claim 1 , wherein the size of the nanoparticles is in the range of 2-100 nm.
5. A magnetic suspension comprising a cellulose nanofibril decorated with magnetic nanoparticles that are uniformly distributed on the nanofibril.
6. A magnetic material comprising a cellulose nanofibril according to claim 1 .
7. A nanocomposite comprising the magnetic material according to claim 6 .
8. A magnetic membrane comprising the nanocomposite according to claim 7 .
9. A loud-speaker membrane comprising the magnetic membrane according to claim 8 .