A selective emitter exhibiting heat resistance up to 1000° C., comprising a metal body, a first dielectric layer provided on one surface of the metal body, a composite layer provided on another surface of the first dielectric layer at an opposite side to the metal body side, and a second dielectric layer provided on another surface of the composite layer at an opposite side to the first dielectric layer, the composite layer being a layer provided with a metal or semiconductor dispersed in an oxide of the metal or the semiconductor.

Hollow structure particles which contain titanium oxide and silica, in which the crystal type of the titanium oxide is rutile type; a method for producing the hollow structure particles; a white ink which contains these hollow structure particles as a coloring agent; use of the white ink in inkjet recording; and an inkjet recording method which uses the white ink.

Plurality of nanocrystalline percent by volume crystalline ceramic oxide beads, wherein the nanocrystalline ceramic oxide beads have an average crystallite size up to 250 nm, wherein each bead collectively comprises, on a theoretical oxides basis, at least one of Al.sub.2O.sub.3, SiO.sub.2, TiO.sub.2, or ZrO.sub.2 at least 40 weight percent, and at least 1 weight percent of at least one of a transition metal oxide or at least one Bi.sub.2O.sub.3 or CeO.sub.2, based on the total weight of the nanocrystalline ceramic oxide beads, and are visibly dark and infrared transmissive. The beads are useful, for example, in pavement markings.

The titanium oxide powder of the present invention is a titanium oxide powder which has a BET specific surface area of 5 m.sup.2/g or more and 15 m.sup.2/g or less, and contains octahedral-shaped particles, wherein each octahedral-shaped particle thereof has line segments each of which connects two apexes which face each other and has a maximum value of the line segments, an average value of the maximum values is 300 nm or higher and 1000 nm or lower, and a value (D90/D10) is 1 or higher and 3 or lower, wherein the value is obtained by dividing a value (D90), which corresponds to 90% in a cumulative number percentage of the maximum values of line segments each of which connects two apexes which face each other, by a value (D10) which corresponds to 10% in the cumulative number percentage.

The titanium oxide powder of the present invention is a titanium oxide powder which has a BET specific surface area of 5 m.sup.2/g or more and 15 m.sup.2/g or less, and contains octahedral-shaped particles, wherein each octahedral-shaped particle thereof has line segments each of which connects two apexes which face each other and has a maximum value of the line segments, an average value of the maximum values is 300 nm or higher and 1000 nm or lower, and a value (D90/D10) is 1 or higher and 3 or lower, wherein the value is obtained by dividing a value (D90), which corresponds to 90% in a cumulative number percentage of the maximum values of line segments each of which connects two apexes which face each other, by a value (D10) which corresponds to 10% in the cumulative number percentage.

There is provided a functional layer including a layered double hydroxide. The functional layer further contains titania.

There is provided a functional layer including a layered double hydroxide. The functional layer further contains titania.

The invention relates to a method for treating a residue obtained from the chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.

There is provided a functional layer including layered double hydroxide. The functional has an average porosity of 1 to 40% and an average pore diameter of 100 nm or less.

There is provided a functional layer including layered double hydroxide. The functional has an average porosity of 1 to 40% and an average pore diameter of 100 nm or less.