A positive electrode for a rechargeable lithium battery includes a positive active material including small particle diameter monolith particles having a particle diameter of about 1 μm to about 8 μm and including a first nickel-based lithium metal oxide, and large particle diameter secondary particles having a particle diameter of about 10 μm to about 20 μm and including a second nickel-based lithium metal oxide. An X-ray diffraction peak intensity ratio (I(003)/I(104)) of the positive electrode is greater than or equal to about 3. A rechargeable lithium battery includes the positive electrode.

Provided are group-III nitride nanoparticles that prevent the piezoelectric field caused by strains on the nanoparticles, achieving good luminous efficiency. The group-III nitride nanoparticle represented by Al.sub.xGa.sub.yIn.sub.zN (0≤x, y, z≤1) incorporating two crystal structures; a wurtzite structure and a zincblende structure, in a single particle. As another example, the group-III nitride nanoparticle has a core-shell structure with a core and a shell, in which the particle constituting the core contains two crystal structures; the wurtzite structure and the zincblende structure, in the particle. Nanoparticles containing the two crystal structures can be produced by using a phosphorus-containing solvent as a reaction solvent, and the mixture ratio of the two crystal structures, (wurtzite structure)/(zincblende structure), is 20/80 or higher.

Magnetic beads comprise a plurality of magnetic nanoparticles, dispersed in a non-magnetic matrix. The magnetic beads have an average particle size of 0.1 μm to 100 μm. The matrix may comprise an inorganic metal oxide or a polymer. The magnetic beads have a specific surface area of at least 40 m.sup.2/g.

Disclosed herein are embodiments of composite hexagonal ferrite materials formed from a combination of Y phase and Z phase hexagonal ferrite materials. Advantageously, embodiments of the material can have a high resonant frequency as well as a high permeability. In some embodiments, the materials can be useful for magnetodielectric antennas.

The present disclosure generally relates to metal oxide semiconductor nanomaterial compositions that include hemostatic polymers and pharmaceutical agents. Methods of producing the noted nanomaterials, and of their use in therapeutic applications are also described.

An object of the present disclosure is to provide a method for producing a core-shell porous silica particle with an increased thickness of the shell. The object is met by a method for producing a core-shell porous silica particle, the method including the following steps: (a) preparing; (b) forming a shell precursor; (c) forming a shell; (d) preparing; (e) forming a shell precursor; and (f) forming a shell; wherein the steps (d) through (f) are further repeated one to three times, in which case the step of forming a shell described in step (d) refers to step (f).

Provided are a composite precursor of a cathode active material, the composite precursor including a cobalt hydroxide and a cobalt oxyhydroxide, where an X-ray diffraction spectrum of the composite precursor has a first peak observed at a diffraction angle (2θ) of 19.5°±0.5° and a second peak observed at a diffraction angle (2θ) of 38.5°±0.5°; a cathode active material prepared from the composite precursor; a cathode and a lithium battery including the composite precursor; and a method of preparing the composite precursor.

A nanoparticle for radiation protection is provided. The nanoparticle for radiation protection comprises a first metal oxide nanoparticle. The nanoparticle for radiation protection may further comprise a second metal oxide layer formed on a surface of the first metal oxide nanoparticle. The nanoparticle for radiation protection may have a polar interface between the first metal oxide nanoparticle and the second metal oxide layer.

A nickel complex oxide having a carbon content of 0.15% by mass or lower.

Disclosed is a novel composition of matter that provides highly efficient energy conversion from NIR to NIR wavelengths, with either up-, down-, or both up- and down-converting transitions. Disclosed is a composition having the molecular formula NaYF.sub.4:Yb.sub.xTm.sub.yNd.sub.z, where 0≤x≤0.98, 0≤y≤0.02, and 0≤z≤0.06. Also disclosed is a core-shell structure, wherein the core is a composition having the molecular formula NaYF.sub.4:Yb.sub.xTm.sub.yNd.sub.z, where 0≤x≤0.98, 0≤y≤0.02, and 0≤z≤0.06, and the shell is composition having the molecular formula NaYF.sub.4:Nd.sub.w, where 0≤w≤0.1.