A magnetic nanofluid that includes magnetic transition metal ferrite nanoparticles, ferroelectric nanoparticles, and a carrier fluid, and a method of changing the temperature of an object (e.g., heating or cooling) using the magnetic nanofluid. The magnetic transition metal ferrite nanoparticles and ferroelectric nanoparticles can be present as a composite comprising both types of nanoparticles. The use of the magnetic nanofluid is associated with an increase in the Nusselt number in the presence of a magnetic field.

A magnetic nanofluid that includes magnetic transition metal ferrite nanoparticles, ferroelectric nanoparticles, and a carrier fluid, and a method of changing the temperature of an object (e.g., heating or cooling) using the magnetic nanofluid. The magnetic transition metal ferrite nanoparticles and ferroelectric nanoparticles can be present as a composite comprising both types of nanoparticles. The use of the magnetic nanofluid is associated with an increase in the Nusselt number in the presence of a magnetic field.

A water based double surfacted ferrofluid having magnetite nanoparticles (2-18 nm) coated with primary and secondary surfactants is synthesized. On the other hand, an aqueous dispersion of functionalized MWCNT (diameter=14-18 m, length=1.6-2.5 m) is prepared by acid treatment. A hybrid solutions in different v/v ratios yielded stable dispersions having both nanoparticles and nanotubes in itself behave as one system. The synthesized hybrid fluid show magnetic response and self-sustained homogeneity of in presence of magnetic field. In addition, the hybrid fluids exhibits a long term sedimentation and magnetic stability which enables one to use them for various applications like MRI, EMI shielding, energy conversion etc.

A material comprising positively and negatively charged nanoparticles, wherein one of said nanoparticles contained a magnetically responsive element, are combined with a support molecule, which is a long natural or synthetic molecule or polymer to make a magnetic nanoparticle assembly. When the magnetic nanoparticle assembly is combined with cells, it will magnetize those cells. The magnetized cells can then be washed to remove the magnetic nanoparticle assembly and the magnetized cells manipulated in a magnetic field.

A magnetic and thermally conductive material is provided, which includes a thermally conductive compound powder, and an iron-containing oxide at a surface of the thermally conductive compound powder, wherein the iron-containing oxide is an oxide of iron with an other metal, and the other metal is nickel, zinc, copper, cobalt, magnesium, manganese, yttrium, lithium, aluminum, or a combination thereof. A thermally conductive and dielectric layer is also provided, which includes a magnetic and thermally conductive material and a resin, wherein the thermally conductive material includes a thermally conductive compound powder, and an iron-containing oxide at a surface of the thermally conductive compound powder, wherein the iron-containing oxide is an oxide of iron with an other metal, and the other metal is nickel, zinc, copper, cobalt, magnesium, manganese, yttrium, lithium, aluminum, or a combination thereof.

The invention relates to a process for moving a droplet from a first location to a second location, which droplet comprises a magnetic material disposed in an aqueous medium. The invention also relates to a droplet assembly comprising a droplet, which droplet comprises a magnetic material disposed in an aqueous medium. Various uses of the droplet assembly are also described.

The invention relates to aqueous dispersions, comprising particles based on a magnetic iron oxide with dimensions of 20 nm, the surface of which is modified by the grafting of aminated groups R with a covalent bonding to the surface of said particles, wherein the isoelectronic point of particles with such a modified surface is 10. The invention further relates to a method for production of said aqueous suspensions and a method for modification of the surface of the particles present in said dispersions, in particular, by the immobilisation of polysaccharides such as dextrans, particularly for the formulation of magnetic compositions which may be administered in vivo and in particular for the formulation of injectable compositions of contrast agents for MRI.

The metal oxide particle dispersion for manufacturing a particulate magnetic recording medium contains metal oxide particles, solvent, and a polyester compound having one or more groups selected from the group consisting of a carboxyl group and a salt thereof, a phosphoric acid group and a salt thereof, a hydroxyl group and a nitrogen-substituted alkylene group, but substantially not containing ferromagnetic powder.

An aqueous MICR inkjet ink includes between 20% to 60% by weight of a magnetic iron oxide with cobalt doping, pigment dispersion, mixed with between 5% to 30% by weight of a humectant, in a water solution emulsion. The dispersion is milled in a wet media mill to obtain particle size in the 150 nm range. Additional humectant, surfactants, jetting agents, and stabilizing additives are added for the final ink composition.

The present invention belongs to the technical field of functional nanomaterials and petrochemicals, and proposes a temperature and salinity tolerant magnetic nanofluid, preparation method and use thereof, wherein the nanofluid comprises: magnetic core-shell structured nanoparticles Fe.sub.3O.sub.4@TiO.sub.2, with a content of 0.01-0.2 wt %, and water. The magnetic nanofluid is temperature and salinity resistant, and the magnetic core-shell structured nanoparticles Fe.sub.3O.sub.4@TiO.sub.2 are characterized in having small particle sizes and uniform dispersion, and are recyclable and reusable, and the recycling rate by using magnet after imbibition displacement experiments is as high as 96%, and the present invention provides an efficient solution for the huge problem in high efficiency development of ultra-low permeability reservoirs.