Abstract:
A process for producing substantially anatase-free TiO2 by addition of a silicon halide in a reaction of TiCl4 and an oxygen-containing gas in a plug flow reactor is disclosed. Pigmentary properties such as gloss and CBU are enhanced without loss of durability.
Abstract:
A method and apparatus for reacting sodium vapor with gaseous chlorides in a flame to produce nanoscale particles of un-oxidized metals, composites and ceramics. The flame is operated under conditions which lead to condensation of a NaCl by-product onto the particles. The condensate encapsulates the particles and aids in controlling desired particle size and preventing undesirable agglomeration among the particles during synthesis. Following synthesis, oxidation of the particles is inhibited by the encapsulation, and handling character of the products is greatly enhanced. Electron microscopy has revealed that synthesized products are composed of discrete nanoparticles in a NaCl matrix. The NaCl encapsulate has been effectively removed from the particles by both washing and known sublimation technique at 800 DEG C under low pressure.
Abstract:
Die Erfindung betrifft Zusammensetzungen, enthaltend Polyorganosiloxane, einen Hydrosilylierungskatalysator, einen Inhibitor oder Moderator und dotiertes pyrogenes Titandioxid, deren Verwendung zum Aufbringen von Schutzbeschichtungen auf ein elektrisches oder elektronisches Bauteil oder Gerät sowie die Schutzbeschichtungen als solche.
Abstract:
Systems and methods of producing chemical compounds are disclosed. An example chemical production system includes an intake chamber having intake ports for entry of a gas mixture. An igniter ignites the gas mixture in the intake chamber. A nozzle restricts exit of the ignited gas mixture from the intake chamber. An expansion chamber cools the ignited gas with a cooling agent. The expansion chamber has an exhaust where the cooled gas exits the expansion chamber. A chemical compound product is formed in the expansion chamber.
Abstract:
It is disclosed that titania nanoparticles adequate for fabricating a photo-electrode of a dye-sensitized solar cell which is efficient and longlasting and a fabrication method thereof. The titania nanoparticles can provide high photoelectric conversion efficiency of the solar cell with help of fast electron mobility due to its high crystallinity and can reduce process time required for adsorbing the dye molecules on the surface of the titania nanoparticles. By modifying surface characteristics of the titania nanoparticles, it is allowed for dye molecules to be easily adsorbed on the surface of the titania nanoparticles and the life span of the dye molecules adsorbed on it is expanded with help of reduced photo-degradation rate of them at service conditions.
Abstract:
The present disclosure relates to a vapor phase process for producing a substantially anatase-free titanium dioxide pigment comprising: reacting a vaporous titanium dioxide precursor and an oxygen containing gas in a reactor; and introducing a mixture of liquid titanium dioxide precursor and a liquid or finely divided solid compound comprising a element selected from the group consisting of Li, Be, B, Na, Mg, Al, P, S, K, Ca, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Rb, Sr, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, and Pb, into the reactor at a point downstream of the addition of the vaporous titanium dioxide precursor, and the oxygen containing gas, and at a process temperature of about 1200 °C to about 1600 °C to produce titanium dioxide particles that are coated by the oxide formed from the element.
Abstract:
It is disclosed that titania nanoparticles adequate for fabricating a photo-electrode of a dye-sensitized solar cell which is efficient and longlasting and a fabrication method thereof. The titania nanoparticles can provide high photoelectric conversion efficiency of the solar cell with help of fast electron mobility due to its high crystallinity and can reduce process time required for adsorbing the dye molecules on the surface of the titania nanoparticles. By modifying surface characteristics of the titania nanoparticles, it is allowed for dye molecules to be easily adsorbed on the surface of the titania nanoparticles and the life span of the dye molecules adsorbed on it is expanded with help of reduced photo-degradation rate of them at service conditions.
Abstract:
This disclosure relates to a process for producing titanium dioxide, comprising: a) reacting a alloy comprising silicon and aluminum having a melting point of about 482 °C to about 660 °C, with chlorine gas at temperatures above 190 °C to form chlorides of silicon and aluminum; b) adding titanium tetrachloride to the chlorides of silicon and aluminum of step (a); c) oxidizing the chlorides of silicon and aluminum and titanium tetrachloride of step (b); and d) forming titanium dioxide.
Abstract:
Process for producing surface-modified metal oxide particles, characterized in that a) in a first reaction step, a surface modifier is introduced into a gas stream comprising metal oxide particles, and the resulting reaction mixture is exposed to a temperature of 130 to 250° C for a minimum residence time in the range from 1 to 60 s, and b) in an immediately subsequent, second reaction step, the solid reaction products are removed from the flowing reaction mixture by means of a filter apparatus and the reaction mixture present at the filter is treated at a temperature of 110 to 230° C for a minimum residence time in the range from 1 min to 1 hour.