Abstract: An aqueous ink jet composition of the present disclosure includes: at least one dye selected from the group consisting of C.I. Solvent Yellow 160:1, C.I. Disperse Yellow 82, and C.I. Disperse Yellow 184; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of an ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of a polyalkylene glycol; and an anionic dispersant.

Abstract: A magnetic bead contains: a Fe-based magnetic metal powder; and a coating layer with which a particle surface of the Fe-based magnetic metal powder is coated. The Fe-based magnetic metal powder contains a crystal grain having a grain diameter of 1 nm or more and 60 nm or less in a ratio of 30% by volume or more and 100% by volume or less. In addition, the coating layer may contain an oxide and has an average thickness of 10 nm or more and 200 nm or less.

Abstract: A magnetic bead contains: a magnetic metal powder; and a coating layer with which a particle surface of the magnetic metal powder is coated. When the magnetic bead is left to stand in a state of a dispersion obtained by dispersing the magnetic bead in water, a time until an initial absorbance of the dispersion attenuates to 80% of an absorbance when the standing is started is 90 seconds or longer.

Abstract: A magnetic bead includes: a magnetic metal powder; and a coating layer that covers a particle surface of the magnetic metal powder, has an average thickness of 20 nm or more, and is made of an oxide material. A coercive force is 1.0 Oe, which is equal to 80 A/m, or less. The magnetic metal powder may contain an amorphous structure or a nanocrystalline structure. The magnetic metal powder may be made of an alloy containing Fe as a main component.

Abstract: A biological material extraction carrier includes a magnetic bead including a magnetic metal powder and a first coating layer that coats a particle surface of the magnetic metal powder and that is made of a first oxide material, and an oxide powder, in which a particle surface is made of a second oxide material, and an average particle diameter is smaller than that of the magnetic bead. Further, the average particle diameter of the magnetic bead is preferably 0.5 ?m or more and 50 ?m or less.

Abstract: A magnetic bead reagent contains: a magnetic bead containing a Fe-based metal soft magnetic particle and a silica film that has an average thickness of 20 nm or more and that covers the Fe-based metal soft magnetic particle; a surfactant; and a dispersion medium in which the magnetic bead is dispersed. The surfactant may be a nonionic surfactant.

Abstract: A magnetic bead separation method includes: storing, in a container, a mixed liquid containing a magnetic bead and a liquid containing target molecules, and adsorbing the target molecules on the magnetic bead, the magnetic bead containing a Fe-based metal soft magnetic particle and a coating film with which the Fe-based metal soft magnetic particle is coated, and having a saturation magnetization of 50 emu/g or more and 250 emu/g or less; applying an external magnetic field to the container and magnetically attracting at least a part of the magnetic bead by the external magnetic field; and applying an acceleration to the container while the magnetic bead is magnetically attracted by the external magnetic field and desorbing the liquid adhering to the magnetic bead.

Abstract: An aqueous ink jet composition contains: C.I. Disperse Red 364; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of the ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of the polyalkylene glycol; and an anionic dispersant.

Abstract: A filtration separator for magnetic particles includes a storage tank that stores a liquid in which magnetic particles are dispersed, and that has a bottom portion and a side wall portion, a stirring mechanism having a rotating shaft portion inserted into the storage tank in a direction crossing a face of the bottom portion, and a stirring impeller that is coupled to the rotating shaft portion and that stirs the liquid by rotation of the rotating shaft portion, a magnet mechanism that is provided in at least a part of the side wall portion, and that can switch a magnetic force in the storage tank between an on state and an off state, and that adsorb the magnetic particles in the liquid to the side wall portion when it is in the on state, and a filtration mechanism having a filter provided in the bottom portion of the storage tank, and a discharge port from which the liquid after passing through the filter is discharged.

Abstract: An aqueous ink jet composition according to the present disclosure includes: C.I. Disperse Red 364 as a first component; a second component which is a dispersant having a chemical structure of at least one of a sulfo group and a salt thereof; and a third component having an indigo skeleton and a chemical structure of at least one of a sulfo group and a salt thereof.

Abstract: An electrophoretic display device capable of having retention property of electrophoretic particles and exhibiting excellent display characteristics, and an electronic apparatus. The electrophoretic display device includes an element substrate, a counter substrate disposed to face counter substrate, a molecule X provided between the element substrate and the counter substrate, an electrophoretic dispersion liquid containing electrophoretic particles and a dispersion medium, wherein the electrophoretic dispersion liquid is disposed between counter substrate and molecule X, wherein molecule X includes an aromatic ring having a cyclic structure, for example, benzene, toluene, xylene, and the like.

Abstract: An aqueous ink jet composition of the present disclosure includes at least one specific dye selected from the group consisting of C.I. Disperse Orange 25 and C.I. Disperse Brown 27; an anionic dispersant; and a material A which is at least one compound selected from the group consisting of a polyalkylene glycol, a derivative thereof, and a phenyl azo compound different from the specific dye.

Abstract: An aqueous ink jet composition of the present disclosure includes: at least one dye selected from the group consisting of C.I. Solvent Yellow 160:1, C.I. Disperse Yellow 82, and C.I. Disperse Yellow 184; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of an ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of a polyalkylene glycol; and an anionic dispersant.

Abstract: An aqueous ink jet composition according to the present disclosure includes: C.I. Disperse Red 364 as a first component; a second component which is a dispersant having a chemical structure of at least one of a sulfo group and a salt thereof; and a third component having an indigo skeleton and a chemical structure of at least one of a sulfo group and a salt thereof.

Abstract: An aqueous ink jet composition contains: C.I. Disperse Red 364; a material A which is at least one compound selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), an ethylene oxide adduct of tristyrylphenol, a derivative of the ethylene oxide adduct of tristyrylphenol, a polyalkylene glycol, and a derivative of the polyalkylene glycol; and an anionic dispersant.

Abstract: An electrophoretic display device capable of having retention property of electrophoretic particles and exhibiting excellent display characteristics, and an electronic apparatus. The electrophoretic display device includes an element substrate, a counter substrate disposed to face counter substrate, a molecule X provided between the element substrate and the counter substrate, an electrophoretic dispersion liquid containing electrophoretic particles and a dispersion medium, wherein the electrophoretic dispersion liquid is disposed between counter substrate and molecule X, wherein molecule X includes an aromatic ring having a cyclic structure, for example, benzene, toluene, xylene, and the like.