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US 9,312,046 B2Granted
Composite materials with magnetically aligned carbon nanoparticles having enhanced electrical properties and methods of preparation
AssigneesSouth Dakota Board of Regents, Georgia Tech Research Corporation
InventorsHaiping Hong, G.P. (Bud) Peterson, David R. Salem
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Abstract
Magnetically aligned carbon nanoparticle composites have enhanced electrical properties. The composites comprise carbon nanoparticles, a host material, magnetically sensitive nanoparticles and a surfactant. In addition to enhanced electrical properties, the composites can have enhanced mechanical and thermal properties.
Claims18
A magnetically aligned carbon nanoparticle composite composition comprising:
- carbon nanoparticles, a host material, magnetically sensitive nanoparticles, and a surfactant, wherein said magnetically sensitive nanoparticles are present in the composition from about 1 wt. % to about 15 wt. %, wherein said surfactant attaches to the carbon nanoparticles thereby connecting the carbon nanoparticle with the magnetically sensitive nanoparticles by electrostatic attraction;
- wherein said composition is magnetically aligned and, once magnetically aligned, has increased electrical conductivity of at least three orders of magnitude, in at least one direction, relative to a composite having the same composition without magnetic alignment.
A magnetically aligned carbon nanoparticle composite prepared by a process comprising:
- providing a host material in a liquid state;
- adding carbon nanoparticles, magnetically sensitive nanoparticle, and surfactant to the liquid host material to form a liquid composite, wherein said surfactant attaches to the carbon nanoparticles thereby connecting the carbon nanoparticles with the magnetically sensitive nanoparticles by electrostatic attraction, and wherein said magnetically sensitive nanoparticles are added in an amount between about 1 wt. % and about 15 wt. %;
- optionally, physically agitating the liquid composite;
- solidifying;
- and
- applying a magnetic field to the liquid composite during, and/or prior to, the solidifying step;
- and
- forming a magnetically aligned carbon nanoparticle composite, wherein said magnetically aligned carbon nanoparticle composite has increased electrical conductivity of at least three orders of magnitude, in at least one direction, relative to a composite having the same composition without magnetic alignment.
5 more elements
Dependencies are inferred from the claim text.