Provided are nanophosphor-attached inorganic particles that can suppress the degradation of the nanophosphor when sealed in glass, and a wavelength conversion member using the nanophosphor-attached inorganic particles. The nanophosphor-attached inorganic particle 10 include: inorganic particles 1 having an average particle diameter of 1 μm or more; and a nanophosphor 2 attached to surfaces of the inorganic particles 1.

Provided are nanophosphor-attached inorganic particles that can suppress the degradation of the nanophosphor when sealed in glass, and a wavelength conversion member using the nanophosphor-attached inorganic particles. The nanophosphor-attached inorganic particle 10 include: inorganic particles 1 having an average particle diameter of 1 μm or more; and a nanophosphor 2 attached to surfaces of the inorganic particles 1.

Provided are a method of preparing a metal oxide-silica composite aerogel, and a metal oxide-silica composite aerogel having an excellent weight reduction property prepared by the method. The method includes a step of adding an acid catalyst to a first water glass solution to prepare an acidic water glass solution (step 1); a step of adding a metal ion solution to the acidic water glass solution to prepare a precursor solution (step 2); and a step of adding a second water glass solution to the precursor solution and performing a gelation reaction (step 3) to yield a metal oxide-silica composite wet gel, wherein, in steps 2 and 3, bubbling of an inert gas is performed during the adding of the metal ion solution or the second water glass solution, respectively.

A magnesium oxide powder, including a specific magnesium oxide particle, can suppress an increase in viscosity when a resin is filled therewith and can realize high thermal conduction of a resin composition including the resin, and a filler composition, a resin composition, and a heat dissipation part including the magnesium oxide powder. The magnesium oxide powder includes a magnesium oxide particle, wherein an oil absorption of the magnesium oxide particle in the case of linseed oil measured according to JIS K 5101-13-1 is 2.5 mL/10 g or less.

A magnesium oxide powder, including a specific magnesium oxide particle, can suppress an increase in viscosity when a resin is filled therewith and can realize high thermal conduction of a resin composition including the resin, and a filler composition, a resin composition, and a heat dissipation part including the magnesium oxide powder. The magnesium oxide powder includes a magnesium oxide particle, wherein an oil absorption of the magnesium oxide particle in the case of linseed oil measured according to JIS K 5101-13-1 is 2.5 mL/10 g or less.

A device having a plurality of layers comprises a nucleation-inhibiting coating (NIC) disposed on a first layer surface in a first portion of a lateral aspect thereof; and a deposited layer comprised of a deposited material, disposed on a second layer surface, wherein an initial sticking probability against deposition of the deposited layer onto a surface of the NIC in the first portion is substantially less than the initial sticking probability against deposition of the deposited layer onto the second layer surface, such that the NIC is substantially devoid of a closed coating of the deposited material and wherein the NIC comprises a compound containing a rare earth element. The deposited layer can comprise a closed coating on the second layer surface in a second portion of the lateral aspect, and/or a discontinuous layer of at least one particle structure on a surface of the NIC.

A device having a plurality of layers comprises a nucleation-inhibiting coating (NIC) disposed on a first layer surface in a first portion of a lateral aspect thereof; and a deposited layer comprised of a deposited material, disposed on a second layer surface, wherein an initial sticking probability against deposition of the deposited layer onto a surface of the NIC in the first portion is substantially less than the initial sticking probability against deposition of the deposited layer onto the second layer surface, such that the NIC is substantially devoid of a closed coating of the deposited material and wherein the NIC comprises a compound containing a rare earth element. The deposited layer can comprise a closed coating on the second layer surface in a second portion of the lateral aspect, and/or a discontinuous layer of at least one particle structure on a surface of the NIC.

Disclosed is a technique for capturing, refining and storing byproduct hydrogen generated by a seawater electrolyzer, using the byproduct hydrogen in an energy system, and producing high-purity magnesium oxide from alkali byproducts additionally produced after seawater electrolysis. An energy system 100 may include a seawater electrolyzer 110 generating a chlorine substance by electrolyzing seawater, a hydrogen storage unit 120 capturing, refining, and storing byproduct hydrogen generated in the electrolysis process by the seawater electrolyzer, a fuel cell 130 using, as fuel, the byproduct hydrogen stored in the hydrogen storage unit, an MgO acquisition unit 140 converting, into magnesium oxide, magnesium hydroxide additionally generated from the seawater in the seawater electrolyzer, a hydrogen capture pipe 150 having one side coupled to the seawater electrolyzer and other side coupled to the hydrogen storage unit and transferring the byproduct hydrogen from the seawater electrolyzer to the hydrogen storage unit.

Disclosed is a technique for capturing, refining and storing byproduct hydrogen generated by a seawater electrolyzer, using the byproduct hydrogen in an energy system, and producing high-purity magnesium oxide from alkali byproducts additionally produced after seawater electrolysis. An energy system 100 may include a seawater electrolyzer 110 generating a chlorine substance by electrolyzing seawater, a hydrogen storage unit 120 capturing, refining, and storing byproduct hydrogen generated in the electrolysis process by the seawater electrolyzer, a fuel cell 130 using, as fuel, the byproduct hydrogen stored in the hydrogen storage unit, an MgO acquisition unit 140 converting, into magnesium oxide, magnesium hydroxide additionally generated from the seawater in the seawater electrolyzer, a hydrogen capture pipe 150 having one side coupled to the seawater electrolyzer and other side coupled to the hydrogen storage unit and transferring the byproduct hydrogen from the seawater electrolyzer to the hydrogen storage unit.

A process for producing magnesia can include contacting CO.sub.2-containing emissions with a magnesium-containing material to produce magnesium carbonate; subjecting the magnesium carbonate to calcination to produce a CO.sub.2 by-product and magnesia; and recycling at least a portion of the CO.sub.2 by-product for contacting the magnesium-containing material to produce the magnesium carbonate. The magnesium-containing material can include mining residues, such as phyllosilicate or chrysotile mining residue, and the magnesium carbonate produced can include precipitated nesquehonite that is subjected to calcination to produce the magnesia.