摘要:
Provided is a process for producing satisfactory particles held in porous silica. The process comprises (a) the step of preparing porous silica, (b) the step of bringing the porous silica into contact with a liquid which contains either a metal or a compound that has the metal as a component element and infiltrating the liquid into the pores of the porous silica, and (c) the step of subjecting, after the step (b), the impregnated porous silica to a heat treatment to thereby form fine particles comprising the metal or the metal compound in the pores of the porous silica. When porous silica is synthesized by hydrolyzing an alkoxysilane in a solvent-free system, it is possible to synthesize porous silica having a fine pore diameter. Use of this porous silica as a template facilitates formation of particles (e.g., W, Cu, Cr, Mn, Fe, Co, or Ni or an oxide of any of these metals) that show peculiar properties not observed in the bulk material.
摘要:
A porous silica which can be formed into various shapes excellent transparency, capable to be nanoparticulated, capable to be obtained at a high efficiency even when a cationic surfactant having 7 or less carbon atoms is used. Alkoxysilane is dispersed with a cationic surfactant in which a hydrophobic moiety has 2 to 7 of carbon atoms, and added water of which pH is adjusted to 0-2 with the amount of 2-4 equivalents to the alkoxysilane, and mildly hydrolyzed to obtain a monolithic mesoporous silica of which a pore diameter is not less than 0.5 nm and less than 2 nm. A pore diameter can be controlled by adding an organic silane to the system. By adding polyethylene glycol to the synthesis system, a monolithic mesoporous silica nanoparticle is obtained.
摘要:
Provided is a process for producing satisfactory particles held in porous silica. The process comprises (a) the step of preparing porous silica, (b) the step of bringing the porous silica into contact with a liquid which contains either a metal or a compound that has the metal as a component element and infiltrating the liquid into the pores of the porous silica, and (c) the step of subjecting, after the step (b), the impregnated porous silica to a heat treatment to thereby form fine particles comprising the metal or the metal compound in the pores of the porous silica. When porous silica is synthesized by hydrolyzing an alkoxysilane in a solvent-free system, it is possible to synthesize porous silica having a fine pore diameter. Use of this porous silica as a template facilitates formation of particles (e.g., W, Cu, Cr, Mn, Fe, Co, or Ni or an oxide of any of these metals) that show peculiar properties not observed in the bulk material.
摘要:
An air conditioning register includes a retainer having an elongated opening, a first fin, and a plurality of second fins. The first fin is arranged along long sides of the opening at a downstream position in the retainer. The second fins are arranged along short sides at an upstream position in the retainer. The retainer includes a pair of facing inner wall surfaces corresponding to the long sides of the opening. First inclined surfaces that are continuous with the long sides of the opening and second inclined surfaces that are continuous with the first inclined surfaces through ridges are each formed in the corresponding inner wall surface of the retainer.
摘要:
It is possible to prolong service life of a discharge lamp of hot-cathode type and to reduce a diameter thereof. A discharge lamp 1 is provided with an electrode 3. The electrode 3 has a heater 4 made up a coil portion 4a, and a first lead wire portion 4b and a second lead wire portion 4c that respectively extend from rear ends of this coil portion 4a and applied by an electron emission material 3a. In the electrode 3, a first lead-in wires 6a is connected to the first lead wire portion 4b and a second lead-in wires 6b is connected to the second lead wire portion 4c, so that the coil portion 4a is arranged vertically along the tube axis of the glass tube 2. The electrode 3 is also provided a sleeve 7 covering surrounding of the coil portion 4a and having openings in the faces respectively opposite to the forward end and rear end of the coil portion 4a. An open end 7a of the sleeve 7 exceeds a forward end of the coil portion 4a, thereby protecting the coil portion 4a.
摘要:
Powdery fullerene is milled in an oxygen atmosphere, whereby mechanical impacts are applied to the fullerene and a carbon cage of the fullerene is dynamically distorted to the extent that an energy for conversion of atmospheric oxygen to a singlet excited state is accomplished from the distorted carbon cage to atmospheric oxygen. Singlet oxygen, i.e. an efficient oxidant in various industrial fields, is generated by solid-state reaction under stable conditions without necessity of photo-irradiation. The singlet oxygen also enables efficient oxidation of fullerene itself.
摘要:
An abnormality monitoring device monitors a PWM driving signal output from a driving section of an associated motor control system to judge whether the driving section is operating abnormally. By monitoring the output of the driving section, the monitoring device can detect an abnormality of the driving section before the motor can respond to the abnormal drive signal to a significant degree (e.g., to a degree readily discernable to a rider of a motorcycle on which the motor control system is employed in combination with an electronic throttle system).
摘要:
A contactless communication system information carrier which is high in handleability and yield but low in cost is provided. It includes a core piece 11 in which an IC chip 1 with an antenna coil 3 integrally formed on one surface is fitted inside a recess 6 of a core piece body 5, a non-metal spacer 14 in which the core piece 11 is fitted to a fitting part 16 located in a center of the spacer 14 to retain the core piece 11, and a metal weight 15 placed and coupled so as to surround an outer periphery of the spacer 14. The antenna coil 3 and the metal weight 14 are separated from each other via the spacer 14.
摘要:
It is possible to enhance the luminance of a cold-cathode type discharge lamp and to contribute to a prolongation of service life thereof. A discharge lamp 1 is provided with an electrode 3 having a cup 4 with such a shape that a bottom is provided at each of both opposed ends of the glass tube 2. The cup 4 is connected to a lead-in wire 8 which is inserted through the end of the glass tube 2 and held thereby. The collision-preventing ring 5 covering an end surface of the cup 4 is provided to the open end 4a of the cup 4. The porous tungsten disk 6 impregnated with a ternary metal oxide composed of barium (Ba), aluminum (Al), and calcium (Ca) as an electron emission material is provided at a bottom in an inside of the cup 4.
摘要:
A fluorescent lamp 1 is constructed in which more than two lead wires (5), (6), (11) and (12) are connected to respective electrodes (3) and (4) of both end portions of a glass tube (2), the glass tube (2) having a uniform diameter of less than 6.5 mm. Also, when the fluorescent lamp 1 is manufactured, an electrode assembly in which two glass beads are fixed to more than two lead wires extended from the electrodes, mercury amalgam being welded to the lead wires is used, the electrode assembly is temporarily fastened by welding the inside glass bead to the glass tube, mercury is evaporated by heating the mercury amalgam and the inside of the glass tube is sealed by welding the outside glass bead to the glass tube.