A positive electrode active material for lithium secondary batteries, includes: a lithium composite metal compound containing secondary particles formed by aggregation of primary particles; and a lithium-containing tungsten oxide, in which the lithium-containing tungsten oxide is present at least in interparticle spaces of the primary particles, and in a pore distribution of the positive electrode active material for lithium secondary batteries measured by a mercury intrusion method, a surface area of pores having a pore diameter in a range of 10 nm or more to 200 nm or less is 0.4 m.sup.2/g or more and 3.0 m.sup.2/g or less.

A core-shell quantum dot including a core including a first semiconductor nanocrystal, the first semiconductor nanocrystal including zinc, tellurium, and selenium and a semiconductor nanocrystal shell disposed on the core, the semiconductor nanocrystal shell including zinc and selenium, sulfur, or a combination thereof and a production thereof are disclosed, wherein the core-shell quantum dot does not include cadmium, lead, mercury, or a combination thereof, wherein the core-shell quantum dot(s) includes chlorine, wherein in the core-shell quantum dot, a mole ratio of chlorine with respect to tellurium is greater than or equal to about 0.01:1 and wherein a quantum efficiency of the core-shell quantum dot is greater than or equal to about 10%.

A silica particle dispersion liquid includes a silica particle that satisfies (i) to (iii) below: (i) an average particle diameter d is 5 to 300 nm; (ii) an occlusion amount of a basic substance per 1 g of the particle is 2 mg or more; and (iii) a Sears number Y exceeds 12.0.

The invention relates to nanoparticles of a composite material comprising a light absorbing agent dispersed in a matrix of a mineral oxide, to a method for the preparation of such nanoparticles, to the use of said method to modify the hue of nanoparticles of composite material comprising a light absorbing agent, and to an ophthalmic lens comprising such nanoparticles.

A positive electrode active material for lithium secondary batteries, includes: a lithium composite metal compound containing secondary particles formed by aggregation of primary particles; and a lithium-containing tungsten oxide, in which the lithium-containing tungsten oxide is present at least in interparticle spaces of the primary particles, and in a pore distribution of the positive electrode active material for lithium secondary batteries measured by a mercury intrusion method, a surface area of pores having a pore diameter in a range of 10 nm or more to 200 nm or less is 0.4 m.sup.2/g or more and 3.0 m.sup.2/g or less.

A sodium-based electrode active material and a secondary battery comprising the same are provided. The electrode active material is represented by the following Chemical Formula 1, and has an orthorhombic crystal system and a space group of Cmcm. [Chemical Formula 1] Na.sub.x[Mn.sub.1-y-zM.sup.1.sub.yM.sup.2.sub.z]O.sub.2-A.sub.. In Chemical Formula 1, x may be 0.5 to 0.8. M.sup.1 and M.sup.2 may be, regardless of each other, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nd, Mo, Tc, Ru, Rh, Pd, Pb, Ag, Cd, Al, Ga, In, Sn, or Bi. y may be from 0 to 0.25. z may be from 0 to 0.25. A may be N, O, F, or S, and may be 0 to 0.1.

A method of preparing a boron allotrope-organic lateral heterostructural article includes providing an article comprising a substrate comprising a portion thereof coupled to a boron allotrope comprising an elemental boron layer; generating an organic compound vapor from a solid organic compound source, said organic compound vapor having a higher enthalpy of adsorption on said substrate compared to enthalpy of adsorption on said boron allotrope; and contacting said organic compound vapor with said article to selectively deposit said organic compound on a substrate portion not coupled to said boron allotrope to provide a heterostructural article comprising said organic compound and said boron allotrope laterally adjacent one to the other and providing a lateral interface one with the other.

The present invention provides a method of evaluating a characteristic of a positive electrode active material for non-aqueous electrolyte secondary batteries, including a lithium-metal composite oxide powder including a secondary particle configured by aggregating primary particles containing lithium, nickel, manganese, and cobalt, or a lithium-metal composite oxide powder including both the primary particles and the secondary particle. The secondary particle has a porous internal structure. The characteristic being evaluated is a slurry pH, a soluble lithium content rate, or a porosity.

A -sialon phosphor represented by general formula: Si.sub.6zAl.sub.zO.sub.zN.sub.8z (0<z<4.2) has as a host crystal, a crystal structure identical to that of a -sialon crystal phase and having a bulk density of 0.80 g/cm.sup.3 or more and 1.60 g/cm.sup.3 or less. Also, a light-emitting element includes the -sialon phosphor and a semiconductor light-emitting element capable of exciting the -sialon phosphor.

Disclosed are a pharmaceutical use of a gold cluster and a substance containing the gold cluster and the preparation method and use thereof. The gold cluster and substance containing the gold cluster can inhibit the aggregation of A and -syn, has excellent effects on the levels of cell models and animal models, and can be used to prepare drugs for preventing and treating Alzheimer's disease and/or Parkinson's disease.