摘要:
A particle of a compound of the formula: Xa(YOb)c wherein X is a rare earth metal or a metal of Group IIA, IIB, IVB or VB of the Periodic Table, or a mixture of two or more thereof, Y is a metal which forms an anion with oxygen, or a mixture of two or more thereof, and a, b and c are such that the compound is stoichiometric, the particle having a size less than 100 nm is disclosed. It can be used in, for example, security marking and biotagging.
摘要:
A process is disclosed for preparing water soluble particles of a luminescent material which is a rare earth material, a doped compound semi-conductor or a doped inorganic compound which comprises coating particles of said luminescent material, either during production of the particles, or subsequently, with an organic acid or Lewis base such that the surface of the coating possesses one or more reactive groups.
摘要:
A fuel or fuel additives is disclosed which includes particles of cerium oxide which have been doped with a divalent or trivalent metal or metalloid which is a rare earth metal, a transition metal or a metal of group IIA, IIIB, VB, or VIB of the Periodic Table.
摘要:
A UV screening composition comprising novel particles which are capable of absorbing UV light so that electrons and positively charged holes are formed within the particles is disclosed. These particles comprise a host lattice incorporating a second component to provide luminescence trap sites and/or killer sites, said second component being niobium, vanadium, antimony, tantalum, strontium, calcium, magnesium, barium, molybdenum or silicon.
摘要:
A fuel or fuel additives is disclosed which comprise particles of cerium oxide which have been doped with a divalent or trivalent metal or metalloid which is a rare earth metal, a transition metal or a metal of group IIA, IIIB, VB, or VIB of the Periodic Table.
摘要:
Compounds having the formula Z2O3:Zx+ where Z is a rare earth metal and x is from 2 to 4, and nanoparticles thereof together with a process for their production and their uses are disclosed.
摘要翻译:具有式Z 2 O 3:Z x +的化合物,其中Z是稀土金属,x是2至4,并且公开了其纳米颗粒及其制备方法及其用途。
摘要:
The light emitter is fabricated from a silicon substrate (2) that has a layer of porous silicon (3) on its upper surface. A hole transporter (4) is applied to the upper surface of the porous silicon (2) and penetrates the channels (3′) formed within the porous silicon. An upper semitransparent p-type material such as NiO is used as the upper contact (5) to the hole transporter and a further contact is formed on the base of the silicon wafer (2). The penetration of the hole transporter into the interstices between the silicon particles significantly improves the efficiency of the light emitter by up to two orders of magnitude. The light emitter is particularly suited to use in VLSI and display applications.
摘要:
A UV screening composition comprises particles which are capable of absorbing UV light so that electrons and positively charged holes are formed within the particles. The particles are adapted to minimize migration to the surface of the particles of the electrons and/or the positively charged holes when the particles are exposed to UV light in an aqueous environment.
摘要:
The invention provides a particle comprising a metal oxide which is doped with at least one rare earth element, wherein the metal oxide is selected from titanium dioxide, zinc oxide, cerium oxide and mixtures of two or more thereof. The invention also provides a pharmaceutical composition comprising the particles, and to uses of the particles and composition in the treatment and diagnosis of cancer.
摘要:
A composition is described which comprises a component which is susceptible to free radical attack, said composition comprising, as a free radical scavenger, at least one particle having a size not exceeding 100 nm of an oxide of a rare earth or transition metal possessing adjacent oxidation states. The composition is preferable a UV sunscreen composition suitable also for cosmetic use.