81results about How to "High photochemical stability" patented technology

Coupling of anodic electrochromic compounds by a covalent bond or a bridge link which provides for electronic communication between the coupled electrochromic compounds results in coupled electrochromic compounds which exhibit greater stability as well as electrochromic activity that differs from the monomeric electrochromic compounds. Extension of the absorption spectrum into the near-infrared region of the spectrum is frequently observed. The coupled electrochromic compounds are highly suitable for use in electrochromic media used to produce electrochromic devices.

The invention is concerned with novel cross-linkable, photoactive polymer materials with 3-aryl-acrylic acid esters and amides as well as their use as orienting layers for liquid crystals and for the production of non-structured or structured optical elements and multi-layer systems.

UV-photostable, topically applicable cosmetic / dermatological compositions contain at least one dibenzoylmethane UV-sunscreen compound and at least one photostabilizing silicon-containing s-triazine compound substituted with two aminobenzoate or aminobenzamide groups.

Photostable cosmetic compositions contain, formulated into a cosmetically acceptable vehicle, at least one UV-screening system that includes:(a) at least one dibenzoylmethane compound, and(b) at least one 2-pyrrolidinone-4-carboxy ester compound having the following formula (I):in which:R1 is a linear or branched C1-C20 alkyl radical, andR2 is a linear or branched C1-C20 alkyl radical which optionally includes a C5-C6 ring member, the phenyl radical, the benzyl radical or the phenethyl radical.

Sterically stabilized second-order nonlinear optical chromophores and devices incorporating the same are embodied in a variety of chromophore materials. An exemplary preferred chromophore includes an electron donor group, an electron acceptor group and a ring-locked bridge structure therebetween, with the bridge structure being directly connected to the electron donor via a single bond. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group and a ring-locked bridge structure between the electron donor group and the electron acceptor group, with two free double bonds, one located between the donor and the bridge and the other located between the (fused) ring bridge and the acceptor. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group, and a bridge structure therebetween, with the chromophores having no carbon-carbon double bond between the donor and the (fused) ring bridge. In this class, there is only one unlocked carbon-carbon double bond between the (fused) ring bridge and the acceptor. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group, and a ring-locked bridge structure therebetween, with a built-in electron-withdrawing cyano group on the last ring of the (fused) bridge. Another exemplary preferred chromophore includes any electron donor group, an electron acceptor group including a linear conjugated triene bearing four cyano groups, and any bridge structure therebetween.

Cosmetic / sunscreen compositions contain a combination of at least one dibenzoylmethane sunscreen compound and a photostabilizing amount of at least one dithiolane compound of formula (I) below:

Photostable UV-photoprotecting cosmetic sunscreen compositions contain (a) an effective UV-photoprotecting amount of at least one dibenzoylmethane compound sunscreen, (b) an effective radiation-photostablizing amount of at least one pyrrolidinone compound having the formula (I) below:and, advantageously, at least one liquid fatty phase and at least one lipophilic active sunscreen agent of low solubility, formulated into (c) a cosmetically acceptable support therefor.

Topically applicable, improvedly photostabilized, photoprotective cosmetic / dermatological compositions contain (i) an effective UV-screening amount of at least one dibenzoylmethane sunscreen and an effective photostabilizing amount of (ii) at least one oil containing at least one amide structural unit and (iii) at least one compound accepting the excited triplet level energy of said at least one dibenzoylmethane sunscreen, formulated into (iv) a topically applicable, cosmetically / dermatologically acceptable support therefor.

Topically applicable, improvedly photostabilized, photoprotective cosmetic / dermatological compositions contain (i) an effective UV-screening amount of at least one dibenzoylmethane sunscreen and an effective photostabilizing amount of (ii) at least one bis-resorcinyl triazine compound and (iii) at least one compound accepting the excited triplet level energy of said at least one dibenzoylmethane sunscreen, notably at least one 4-hydroxybenzylidenemalonate compound, 4-hydroxycinnamate compound, fluorene compound, piperidinol salt, or mixture thereof, formulated into (iv) a topically applicable, cosmetically / dermatologically acceptable support therefor.

Compositions comprising nanosized objects (i.e., nanoparticles) in which at least one observable marker, such as a radioisotope or fluorophore, is incorporated within the nanosized object. The nanosized objects include, for example, metal or semi-metal oxide (e.g., silica), quantum dot, noble metal, magnetic metal oxide, organic polymer, metal salt, and core-shell nanoparticles, wherein the label is incorporated within the nanoparticle or selectively in a metal oxide shell of a core-shell nanoparticle. Methods of preparing the volume-labeled nanoparticles are also described.

Topically applicable, improvedly photostabilized, photoprotective cosmetic / dermatological compositions contain (i) an effective UV-screening amount of at least one dibenzoylmethane sunscreen and an effective photostabilizing amount of (ii) at least one bis-resorcinyl triazine compound and (iii) at least one compound accepting the excited triplet level energy of said at least one dibenzoylmethane sunscreen, notably at least one 4-hydroxybenzylidenemalonate compound, 4-hydroxycinnamate compound, fluorene compound, piperidinol salt, or mixture thereof, formulated into (iv) a topically applicable, cosmetically / dermatologically acceptable support therefor.

The invention provides application of Mn-doped core-shell structure zinc sulfide quantum dot ZnS:Mn / Zn taken as fluorescent security agent, as well as waterborne fluorescent falsification-resistant ink and a preparation method of the waterborne fluorescent falsification-resistant ink. The waterborne fluorescent falsification-resistant ink comprises the following raw materials in percentage by weight: 15-20 percent of n-butanol, 5-10 percent of ZnS:Mn / ZnS quantum dot, 0.5-1 percent of sodium dodecyl benzene sulfonate, 0.1-0.5 percent of foam killer SP-23, 0.1-0.5 percent of polyacrylate sodium, and water in balancing amount. The waterborne fluorescent falsification-resistant ink is colourless under the natural condition while can give out a blood orange light under the radiation of ultraviolet light. In addition, the main components of the waterborne fluorescent falsification-resistant ink comprise alcohol and the waterborne quantum dot, ink additive and less additives, water is the solvent, and the pollution is less, so that the environmental-friendly fluorescent falsification-resistant ink caters for the development trend of fluorescent falsification-resistant ink in the future, and has a broad application prospect.

Topically applicable cosmetic / dermatological photoprotective compositions contain at least one dibenzoylmethane UV-screening agent, and, as a photostabilizer therefor, at least one arylalkyl benzoate compound of formula (I) or (II) below:with the proviso that:(i) the subject compositions are characteristically devoid of any octyl methoxycinnamate; and(ii) same are other than a solution of butyl methoxydibenzoylmethane in 2-phenylethyl benzoate, 2-phenylethyl o-toluate, 2-phenylethyl p-toluate or in a 2-phenylethyl o-toluate / 2-phenylethyl p-toluate (1 / 1) mixture.

Photostable sunscreen compositions containing at least one cinnamic acid ester UV-B filter and at least one particular s-triazine compound have improved effectiveness with respect to UV-B radiation.

Photostable, topically applicable cosmetic / dermatological compositions contain at least one dibenzoylmethane compound UV-A sunscreen and at least one merocyanine sulfone compound.

Photostable, topically applicable cosmetic / dermatological compositions contain at least one dibenzoylmethane sunscreen compound and at least one photostabilizing siloxane-containing arylalkyl amide compound of formula (I) below:

The invention discloses a silver halide-titanium silicon aerogel ternary composite photocatalyst and a preparation method thereof. The preparation method comprises the steps that a TiO2-SiO2 aerogel bulk material is prepared by combining a sol-gel method with a supercritical drying method, Ag nanoparticles are deposited in aerogel mesopores, AgX particles are prepared through a redox reaction between Ag and FeX3, and then the AgX-TiO2-SiO2 composite photocatalyst is prepared. Accordingly, the ternary composite photocatalyst which has the advantages of being high in catalytic activity, long in catalytic time and easy to recycle simultaneously is prepared by utilizing the titanium silicon aerogel bulk material as a carrier of the AgX nanoparticles and fully exerting the synergistic photocatalytic effect of AgX, TiO2 and SiO2.

The invention discloses a quantum dot composite material containing paraffin and a preparation method thereof. The quantum dot composite material includes a light-transmitting substrate, quantum dots and silicon dioxide nanospheres. The quantum dots are self-assembled on the surfaces of the silicon dioxide nanospheres. Each silicon dioxide nanosphere includes a shell layer being SiO2 and an inner core being the paraffin. The quantum dot composite material maintains the excellent characters of high luminescence efficiency, high photo-chemical stability and the like. The luminescence intensity of the composite material is relative to a special temperature sensitive value, so that the composite material can be used for correlating or monitoring special temperature. The composite material is excellent in reusability and the quantum dots are free from falling off.

Cadmium sulfide semi-conductor nanocrystalline wet-soild phase reaction preparation method comprises the following steps : mixing thioglycolic acid with cadmium chloride according to mol raito 1.8-2.2:1, grinding, adding deionized water to scouring off excess thioglycollic acid, filtering, rinsing filter cake with deionized water, mixing filter cake and sodium sulfide according to 1-3.5:2 mol ratio, grinding, obtaining light yellow solid, dissolving the above-mentioned light yellow solid in water, adding into acetone or ether, depositing the CdS sol, filtering, rinsing, drying, obtaining nano CdS crystal. Reaction condition of the inventive is temperate, inventive process is simple, yield is high, grain size of prepared granule is uniform, not congregate. The invention has good repeatability. compared with traditional bioluminescence probe(organic dye), excitation spectrum of nano crystal is broad, and continuously distributed, while emission spectrum is symmetrically distributed and narrow, color is adjustable, which has a good application prospect in bioluminescence probe.

The invention belongs to the field of inorganic luminescent materials, and in particular relates to a ratio type red light emitting fluorescent material and an application of the fluorescent materialas a pH probe. A base material of the ratio type red light emitting fluorescent material has a molecular formula of Ce / Eu:NaLu0.2Gd0.8F4, under the conditions that the excitation wavelength of ultraviolet light is 254 nm, Ce<3+> exhibits broadband emission, and the light emission wavelength range is from 300 nm to 480 nm, the strongest emission peak central wavelength of Eu<3+> is 620 nm, and stronger red emission is exhibited as a whole; and a fluorescence intensity ratio of the Eu<3+> to the Ce<3+> changes significantly as the pH is increased from 4 to 10. The fluorescent material provided by the invention can be applied to ratio type fluorescent pH detection. According to the fluorescent material provided by the invention, the ratio type detection method is not interfered by the external environment and has very high accuracy; the ratio type fluorescence pH detection method based the inorganic material provided by the invention provides a novel idea for obtaining the high-sensitivity inorganic fluorescent pH probe material with high photochemical stability, low toxicity and fast responsiveness and is expected to be widely used in the field of pH detection.

Topically applicable, photostable compositions with respect to UV radiation contain at least one dibenzoylmethane UV-screening agent and at least one arylalkyl benzoate compound and at least one amide-based oil.

The invention relates to delafossite structured CuMnO2 powder and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving divalent copper salt and divalent manganese salt, adding citric acid and PEG, stirring for dissolving, and adjusting the PH value to 2 to 3 with NH3.H2O, so as to obtain a reaction precursor; and S2, drying the reactionprecursor, grinding into powder, and performing annealing treatment in the process of heating to 900 to 1,200 DEG C at a heating rate of 5 to 15 DEG C per minute under an air atmosphere, maintainingthe temperature for 4 to 6 hours, then performing heat preservation at 1,000 to 1,200 DEG C for 2 to 4 hours under an inert atmosphere, and cooling. The preparation method provided by the invention has the advantages of short cycle and high purity, and is suitable for large-scale preparation and favorable to industrial production; and the CuMnO2 powder has high hole mobility, good photochemical stability and high conduction band energy.