摘要:
A hydraulic binder, dry premixes and cement compositions, having improved property to maintain unaltered, brilliance and colouring quantity for a longer time period, characterized in that they contain, in bulk, particles of a photocatalyst able to oxidize in the presence of light, oxygen and water the polluting substances present in the environment.
摘要:
In the formation of an oxide film on an aluminum fiber, it has been difficult to form a thick alumina coating film on the aluminum fiber which already has a natural oxide film formed thereon. To overcome this problem, there is provided a method for forming an alumina coating film which enables the deep penetration of oxygen into an aluminum fiber by employing a three-stage heating treatment and an alumina fiber formed by the method. Also provided is a system for producing water by photocatalytic reaction, in which a photocatalyst comprising the alumina fiber coated with titania is irradiated with light from a light source to generate an active oxygen species, diffusing the active oxygen species in water to impart the function of the active oxygen species to water. The system can perform washing by utilizing an oxidation reaction with the resulting water. Further, provided is a gas treatment system which comprises the alumina fiber coated with titania to impart a photocatalytic function to the aluminum fiber.
摘要:
A method of making the surface of a base material ultrahydrophilic which comprises the step of coating the surface with a layer containing photocatalytic semiconductor material such as titania and the step of photoexciting the photocatalytic material to adjust the angle of contact of the surface of the above layer with water to about 10° or less. When this method is applied to the surface of a base material such as mirror, lens or windowpane, the growth of waterdrops is prevented and the base material becomes highly antifogging. The articles treated by this method do not undergo any deposition of contaminants on the surfaces thereof and are readily cleaned by rainfall or washing with water.
摘要:
A hydraulic binder, dry premixes and cement compositions, having improved property to maintain unaltered, brilliance and colouring quantity for a longer time period, characterized in that they contain, in bulk, particles of a photocatalyst able to oxidize in the presence of light, oxygen and water the polluting substances present in the environment.
摘要:
A humidity-controlling tile can be produced by mixing 70 wt% of porous alumina particles having specific pores (having pore diameters of about 3 to 8 nm and a pore volume of about 0.4 cc/g) as aggregate with 20 wt% of glass frit as binder and 10 wt% of clay a plastic material with the water content controlled suitably, press-molding the slurry thus obtained into a tile-shaped product, and firing the product at a temperature (about 850 °C) lower than the melting temperature of alumina but higher than that of the binder (glass frit) to bind the porous alumina particles with molten glass frit. The tile ahs a structure wherein porous alumina particles having the above specific pores and being adjacent to each other are bonded to each other with glass frit, thus being useful as a humidity-controlling functional material having a high humidity-controlling performance.
摘要:
An aqueous titanium oxide-dispersed sol comprising titanium oxide particles dispersed in water, said sol comprising chloride ions in an amount of 50 to 10,000 ppm by weight as the chlorine element. Titanium tetrachloride is hydrolyzed to form an aqueous titanium oxide-dispersed sol and the chloride ion concentration thereof is controlled. Another aqueous titanium oxide-dispersed sol comprising brookite-type titanium oxide particles dispersed in water, said titanium oxide particles having an average particle size of not more than 0.5 µm and a specific surface area of not less than 20 m 2 /g. Addition of titanium tetrachloride to hot water at 75 to 100°C followed by hydrolysis at 75°C to the boiling point of the mixture.
摘要翻译:包含分散在水中的二氧化钛颗粒的二氧化钛水分散溶胶,所述溶胶含有作为氯元素的重量为50〜10,000ppm的氯离子。 水化四氯化钛以形成氧化钛水分散溶胶,并控制其氯离子浓度。 另一种分散在水中的板钛矿型氧化钛颗粒的二氧化钛分散溶胶,所述氧化钛颗粒的平均粒度不大于0.5μm,比表面积不小于20m 2 / g 。 在75〜100℃的热水中加入四氯化钛,然后在75℃水解至混合物的沸点。
摘要:
Described herein is the use of a combination of organic additives that is particularly advantageous for the preparation of cementitious compositions having a high conservation of the degree of white, which contain in mass a photocatalyst that is able to oxidize, in the presence of light, air and ambient humidity, pollutant substances present in the environment, the said photocatalyst being, in particular, titanium dioxide prevalently in the form of anatase. The above combination of additives comprises the following: a melamine resin; a cellulose ether; a polymer chosen from among an ethylene polymer, an acrylic polymer, and a terpolymer comprising as co-monomers at least one ester of acrylic acid with an alcohol and at least one ester of vinyl alcohol with a carboxylic acid, or alternatively, an acrylic, styrene or butadiene latex; and a chemically modified starch.