The invention concerns a biocompatible oily ferrofluid comprising iron-oxide based magnetic nanoparticles and an oil phase comprising at least one fatty acid ester, characterized in that said magnetic nanoparticles are surface functionalized by molecules of one or more phospholipids, and in particular a biocompatible oily ferrofluid comprising iron-oxide based magnetic nanoparticles and an oil phase comprising at least one fatty acid ester, said iron-oxide based magnetic nanoparticles forming a colloidal dispersion in said oil phase from a temperature belonging to the range from 20 to 80° C., characterized in that said magnetic nanoparticles are surface functionalized by molecules of one or more phospholipids which do not completely cover the surface of the iron-oxide based magnetic nanoparticles, which in particular ensure a coverage rate of the surface of the iron-oxide based magnetic nanoparticles such that the fatty acid ester(s) present in the oil phase have access to the surface of the iron-oxide based magnetic nanoparticles. The invention also concerns the process for preparing such a biocompatible oily ferrofluid and its use as a contrast agent for magnetic resonance imaging or in the context of a cancer treatment by hyperthermia. Finally, the invention concerns a nanoemulsion comprising such a biocompatible oily ferrofluid.

A patterned surface structure formed from a ferrofluidic polymer resin having a plurality of magnetic nanoparticles. The polymer resin is patterned with a magnetic field that is applied to the ferrofluidic polymer resin during curing. The ferrofluidic polymer resin may be cast over a non-magnetic planar substrate. A magnetic field is applied to the ferrofluidic polymer resin to induce a pattern in a surface of the ferrofluidic polymer resin. The patterned ferrofluidic polymer resin is then cured to form the permanently patterned surface.

A process and a system for producing a stock solution for production of a ferrofluid is provided. The process includes contacting an acidic solution in a reaction container filled with an excess of a bulk material containing Fe(III) and optionally Fe(II). The acid reacts with the bulk material to form the stock solution (Ls) having dissolved ferric (Fe(III)) and optionally ferrous (Fe(II)) ions which is then separated from the bulk material.

The invention is directed to a method and a system for producing a ferrofluid comprising providing a stock solution with Fe(II) and Fe(III); mixing the stock solution with a base to form magnetic nanoparticles and a spent solution, said method further comprising a separation step of separating the nanoparticles from the spent solution by applying a magnet to immobilize the nanoparticles and remove at least part of the spent solution as supernatant from the immobilized nanoparticles. In another aspect, the invention is directed to the resulting ferrofluid.

A composition having high dispersibility of a magnetic particle to have storage stability and a heat transport device using the composition. The composition contains a particle and an aqueous medium including water. The particle contains a magnetic particle and a dispersant including polyacrylic acid or a salt thereof.

Embodiments of the present disclosure describe a magnetic substrate including a cured magnetic ink and a cured polymer resin, wherein the cured magnetic ink includes a plurality of functionalized magnetic iron oxide nanoparticles and wherein the magnetic substrate is a freestanding magnetic substrate.

The present invention describes a method to obtain magnetic aqueous ink composition for MICR (Magnetic Ink Character Recognition) ink jet printing comprising an aqueous dispersion of functionalized magnetic nanoparticles, humectant agents, solvents, biocide and water. It also allows obtaining stable inks for long periods with extremely high concentrations of magnetic nanoparticles with loading between 15% and 40% by mass and magnetic signals varying from 80 to 200%. Through the use and special combination of humectant agents, the present inventions increase the print head protection, by decreasing abrasiveness and increasing fluidity. The resulting ink has superior printing quality and increased service life of the printing system.

A method includes locating a first set of electromagnetic field emitting devices in a vicinity of the pressure source, using the first set of electromagnetic field emitting devices to generate a first electromagnetic field in a first shape that forms an enclosure containing the pressure source, pumping a magnetic fluid into the enclosure at a pumping pressure, and increasing the pumping pressure to overcome the pressure from the pressure source.

Provided are a magnetic fluid composite for display use which enables visually recognizing a subtle shape caused by a spiking phenomenon and which can exhibit a color other than black, and a magnetic fluid composite display device.

A magnetic fluid composite 1 for display use contains water 10, an oily magnetic fluid 20 and poorly magnetic light shielding pieces 30.

The light shielding pieces 30 have a flake shape and include respectively hydrophilic layers 31, light shielding layers 33 and hydrophilic layers 35 that are laminated in the written order.

The light shielding pieces 30 are arranged along the interface 1i between the water 10 and the oily magnetic fluid 20 so that the interface 1i between the water 10 and the oily magnetic fluid 20 is covered with a number of the light shielding pieces 30.

A magnetic fluid composite display device 2 includes a transparent container 40 including a glass container main body 41 and a resin lid 42, a magnetic fluid composite 1 placed inside the container, and a permanent magnet 50 configured to apply a magnetic force to the magnetic fluid composite 1.

A method of stabilizing electromagnetically charged particles, which includes coating electromagnetically charged particles with a protective layer; and etching the protective layer to produce a porous protective layer on the electromagnetically charged.