Adosh O Mehta

US Patent:

7993541, Aug 9, 2011

Filed:

Feb 12, 2007

Appl. No.:

11/705383

Inventors:

Rameshwar Nath Bhargava - Ossining NY, US
Haranath Divi - Croton on Hudson NY, US
Adosh Mehta - Highland Mills NY, US

Assignee:

Nanocrystals Technology LP - Briarcliff Manor NY

International Classification:

H01F 1/00

US Classification:

252 6251R, 977774, 977811, 977824, 977830, 977838, 428403, 428407

Abstract:

The present application is directed to the preparation and use of a class of nanoparticles that contain a single Quantum Confined dopant. A QCA nanocrystal comprises of a plurality of host atoms in a nanocrystal of a size of less than 10 nm with a single atom of a dopant (or activator). This single QCA dopant, when confined, becomes polarized and creates a large magnetic-moment in a nanosize host that contains atoms of unpaired spins. The quantum confined atom (QCA) which is now pinned, triggers the alignment of the host atoms resulting in nanosize magnetic domain. Engineering of nanomagnets based on QCA nanoparticles can be used in different applications such as: sensors, drug delivery, bio-tagging, cell/DNA tagging, magnetic memories and others.

US Patent:

20200243230, Jul 30, 2020

Filed:

Feb 23, 2018

Appl. No.:

16/488201

Inventors:

- Elmsford NY, US
Robert L. HARTMAN - Warren NJ, US
Adosh Mehta - New City NY, US
Christian Michel - Ossining NY, US
Vyom Parashar - Ossining NY, US
Rajan Pillai - New York NY, US

International Classification:

H01F 1/00
H01F 1/03
H01F 41/02

Abstract:

Ferromagnetic nanoparticles which are converted from paramagnetic, antiferromagnetic, ferrimagnetic or weak ferromagnetic nanoparticles by incorporation of a dopant, the dopant having a concentration less than 0.5%. Major changes occur in the magnetic properties of the host material. A weak paramagnetic material such as MnOis been converted to a ferromagnetic material that has a Curie point beyond 700 C. and shows almost temperature independent coercivity and magnetic moment. These ferromagnetic nanoparticles can be used as contrast agent, as a vehicle for targeted drug delivery, high temperature magnets, high density magnets, magnetic circuits and many more devices utilizing local interaction of the magnetic field.