摘要:
The invention relates to a method for producing fluorescent inorganic nanoparticles, whereby the nanoparticles are comprised of a host material containing at least one dopant. The inventive synthesis involving the use of organic solvents results in a significantly better yield than that achieved in prior art water synthesis. Articles of all types can be advantageously marked and, by using automated methods, can be reliably authenticated based on a characteristic emission. In addition, the size distribution of the produced nanoparticles is tighter thus rendering a subsequent separation according to size unnecessary.
摘要:
The present invention relates to Luminescent nanoparticles comprising
(a) a core made from a luminescent metal salt selected from phosphates, sulfates or fluorides, being surrounded by (b) a shell made from a metal salt or oxide capable of preventing or reducing energy transfer from the core after its electronic excitation to the surface of the nanoparticle, e.g. a shell made from a non-luminescent metal salt or oxide, which are characterized by higher quantum yields and can be used in various fields including light generation and security marking.
摘要:
The invention relates to a dental material, which contains surface-modified nanoparticles with an average particle size of less than 25 nm in the form of a filler, said nanoparticles being selected from the salts of barium, strontium, rare-earth metals, scandium or yttrium, or from wolframates. The surface of said nanoparticles is modified by an organic compound that bonds with the nanoparticles by means of a functional group containing N, P, S and/or O. Said dental material exhibits an excellent X-ray opacity, in addition to important processing characteristics such as transparency or dispersion stability.
摘要:
The present invention relates to a method for the production of nanoparticulate metal(III) vanadates or vanadate/phosphate mixed crystals, comprising the reaction in a reaction medium of a reactive vanadate source and optionally a phosphate source dissolvable or dispersible in the reaction medium and of a reactive metal(III) salt dissolvable or dispersible in the reaction medium under heating, wherein the reaction medium contains water and a polyol in a volume ratio of 20/80 to 90/10, and the particles thereby obtained. The synthesis provides a high yield of metal(III) vanadate or vanadate/phosphate having a narrow particle size distribution. Doped embodiments thereof are distinguished by excellent luminescence properties.
摘要:
The invention relates to a printing method according to which, during the printing process, one or more narrow nozzles eject a printing liquid, and to a printing liquid suitable for such a method. The invention is particularly suitable for forgery-proof printing on papers or articles. According to the invention, the printing liquid contains nanoparticles that can be induced to fluoresce or phosphoresce. Said nanoparticles are small crystalline particles that can be induced to fluoresce or phosphoresce on their own or when mixed with dopants. Individual dots (10, 12) can be printed by means of a printing liquid that contains said nanoparticles. Due to their small size of from 1 to 1000 nanometers, preferably in the range of 300 nanometers or even much smaller depending on nozzle diameter, there is no risk of very narrow ink jet nozzles getting plugged. The induction and fluorescence emission frequency ranges are narrow-band so that for a security control of the print the respective wavelength-specific induction or detection is required, thereby increasing protection against forgery.
摘要:
Die vorliegende Erfindung betrifft Verfahren zur Herstellung fluoreszenzfähiger, anorganischer Nanopartikel, wobei die Nanopartikel aus einem wenigstens einen Dotanden enthaltenden Wirtsmaterial bestehen. Durch die erfindungsgemäße Synthese mit organischen Lösungsmitteln kann eine wesentlich bessere Ausbeute erzielt werden als bei der Wassersynthese vom Stand der Technik. Gegenstände aller Art können vorteilhaft markiert und mittels automatisiertem Verfahren sicher anhand charakteristischer Emission authentifiziert werden. Weiter ist die Größenverteilung der hergestellten Nanopartikel enger, was eine nachträgliche größenselektive Trennung überflüssig macht.
摘要:
The present invention relates to nanoparticles being dispersible in fluorine-containing media, comprising:
an inorganic nanoparticle core, and an outer layer comprising an organic compound modifying the surface of the nanoparticle core and having a first portion comprising at least one linking group for the nanoparticle and a second portion comprising at least one fluorinated group, a process for their manufacture and fluorinated media containing the same.
摘要:
The invention relates to phase transfers of nanoparticles and to a catalysis using said nanoparticles. The aim of the invention is to facilitate a transfer of nanoparticles from an organic solution to an inorganic, especially, aqueous solution. To this end, a generically describable substance class, for example the commercially available 4-dimethylaminopyridine (DMAP), which is for example dissolved in water, is added to the organic solution in sufficient amounts. This measure has the effect that the nanoparticles are readily transferred in a one-step process from the organic phase (in each case in the top section) to the inorganic phase (in each case in the lower section) in the sample container.
摘要:
The invention relates to a method for producing fluorescent inorganic nanoparticles, whereby the nanoparticles are comprised of a host material containing at least one dopant. The inventive synthesis involving the use of organic solvents results in a significantly better yield than that achieved in prior art water synthesis. Articles of all types can be advantageously marked and, by using automated methods, can be reliably authenticated based on a characteristic emission. In addition, the size distribution of the produced nanoparticles is tighter thus rendering a subsequent separation according to size unnecessary.