The present invention addresses the problem of providing a method for producing a fibrous carbon nanohorn aggregate with higher efficiency. According to one embodiment of the present invention, a method for producing a carbon nanohorn aggregate comprising a fibrous carbon nanohorn aggregate, is provided, which includes a step (a) of fixing the end of a rod-shaped carbon target to a fixing jig, and a step (b) of irradiating the rod-shaped carbon target with a laser light, and moving the irradiation position of the laser light in the longitudinal direction of the rod-shaped carbon target without rotating the rod-shaped carbon target.

The present technology provides an adsorbent material that includes a silicate composition, wherein the silicate composition includes a crystalline phase; wherein the silicate composition may have an interconnected porous scaffold having a total mercury (Hg) pore volume of about 0.005 cc/g to about 0.25 cc/g for pores having a diameter of about 20-10,000 Å and a total nitrogen (N) pore volume of about 0.02 cc/g to about 0.1 cc/g for pores having a diameter of about 20-600 Å.

The positive electrode active material is capable of reducing positive electrode resistance, exhibiting better output characteristics, and having high mechanical strength when the positive electrode active material is used in a lithium ion secondary battery. Secondary particles have a d50 of 3.0 to 7.0 μm, a BET specific surface area of 2.0 to 5.0 m.sup.2/g, a tap density of 1.0 to 2.0 g/cm.sup.3, and an oil absorption amount of 30 to 60 ml/100 g. In each of a plurality of primary particles having a primary particle size of 0.1 to 1.0 μm, a coefficient of variation of the concentration of an additive element M is 1.5 or less. The volume of a linking section between the primary particles per primary particle, obtained from the total volume of the linking section and the number of primary particles constituting the secondary particles, is 5×10.sup.5 to 9×10.sup.7 nm.sup.3.

The present invention relates to a pigment for a black electrophoretic display having high electrical insulation and excellent dispersibility in the visible region. An objective of the present invention is to provide black titanium dioxide as a pigment for an electrophoretic display. In addition, another objective of the present invention is to provide an ink composition for an electrophoretic display comprising a black titanium dioxide pigment, and an electrophoretic display.

A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

Provided is a method for forming graphene nanoholes to form nonoholes in a graphene sheet, the method comprising a process (a) of forming a functional group-bonded region in a graphene sheet, and a process (b) of heating the graphene sheet having the functional group-bonded region to remove the functional group-bonded region to form nanoholes.

Regeneration of degraded cathode particles in lithium-ion batteries is achieved using a combination of hydrothermal treatment of cycled electrode particles followed by short thermal annealing. The methods provide for direct regeneration of Li-ion cathode materials including LiCoO.sub.2, LiMn.sub.2O.sub.4, LiFePO.sub.4, and Li.sub.xNi.sub.y Mn.sub.z Co.sub.1−y−zO.sub.2, in an economical and environmentally-friendly process.

An iron-containing Chevrel phase material, contains iron and Mo.sub.6S.sub.8 clusters, in particular an iron-containing Chevrel phase material having a formula Fe.sub.xMo.sub.6S.sub.8, wherein 2≤x≤4. The iron-containing Chevrel phase provides an efficient catalyst for the electrochemical production of ammonia from water and nitrogen gas.

A structure body includes a free-standing structure including a fibrous member and/or a shell. The fibrous member and/or a shell are each a layered body formed of at least one light-absorbing layer and at least one dielectric layer. The light-absorbing layer includes a light-absorbing material that has an absorption in a visible light region, and the dielectric layer includes a dielectric material. The fibrous member and/or the shell have a three-dimensionally continuous configuration.

The object of the present invention is to provide silicon doped metal oxide particles for UV absorption, which average molar absorption coefficient in the wavelength range of 200 nm to 380 nm, is enhanced. Provided is silicon doped metal oxide particles in which the metal oxide particles are doped with silicon, wherein an average molar absorption coefficient in the wavelength range of 200 nm to 380 nm, of a dispersion in which the silicon doped metal oxide particles are dispersed in a dispersion medium, is improved as compared with similar metal oxide particles not doped with silicon.