1453results about How to "Good light stability" patented technology

An optical recording medium can be recorded at a high linear velocity of at least 10 m / s while maintaining an excellent light stability and favorable reflectance. A recording medium is constructed of a recording layer on a substrate, the recording layer including a first dye with a maximum absorption wavelength in a thin-film state of 450 nm to 620 nm inclusive as a first dye and being formed so as to include a second dye with an extinction coefficient of at least 0.5 for a recording wavelength. In this case, it is preferable for the second dye to have a maximum absorption wavelength of 620 nm to 750 nm inclusive in a thin-film state.

The invention relates to the liquid crystal field, and especially relates to a liquid crystal composition and applications thereof in the liquid crystal display field. The liquid crystal composition is composed of the following compounds in parts by weight: 5 to 40 parts of one or more compounds represented by the formula I, 2 to 30 parts of one or more compounds represented by the formula II, and 20 to 70 parts of one or more compounds represented by the formula III, and may also comprises 4 to 30 parts of one or more compounds represented by the formula IV, or / and 5 to 25 parts of one or more compounds represented by the formula V to IX. By the cooperation among the compounds, the rotation viscosity of the liquid crystal composition can be effectively reduced, the related performances of mixed liquid crystal are improved, and thus the responding time is reduced. The provided liquid crystal composition can be used to produce quick response liquid crystal display with a plurality of display modes.

The invention discloses a PVC hydrotalcite- rare earth- calcium zinc stabilizing agent and the method for preparing the same, which in detail erlates to plastic composite stabilizing agent and the preaparing method, belonging to chemical field. The main component for stabilizing comprises column- supported hydrotalcite, unsaturated rare earth, and epoxy aliphatic acid calcium zinc, and it is prepared through chemical synthesis, reformed treatment and optimization compound. The product is characterized by outstanding thermal stabilizing effect, good first stage coloring property, sound plasticizing property, good transparenty, weatherability, improved quality, high effeciciency, no toxicity, no pollution, low cost. It can replace expensive organotin thermal stabilizing agent and is widely used in PVC product preparation, such as water- supply pipes, section bar, transparent granulate, film, medical apparatus, toy, fridge stamp and box sheet material.

A layer arrangement comprising, at least in a binderless layer thereof, one or more vapor deposited pigments like the preferred nanocrystalline β-Cu-phthalocyanine nanocrystalline dye compound has been disclosed, wherein said layer arrangement is, in a preferred embodiment a photostimulable phosphor plate or panel having a binderless needle-shaped photostimulable alkali metal phosphor, and, more preferably, a CsBr:Eu2+ phosphor, showing besides a high image definition, an excellent preservation of color stability; and wherein the thus produced binderless photostimulable phosphor screen is overcoated with a strong protective layer in order to provide ability for easy transport through a scanning module, without jamming, in a diagnostic radiographic image reading system.

The invention discloses a two-photon formaldehyde fluorescent probe and preparation and application thereof. The probe is a novel formaldehyde probe taking 1,8-naphthalimide as a two-photon fluorogen on the basis of an intramolecular charge transfer mechanism. Probe molecules have good light stability and a large Stoke's shift, the probe can well detect the formaldehyde concentration in a neutral buffer solution, and meanwhile compared with other aldehyde compounds, the probe has good specificity on formaldehyde. It is well proved through two-photon confocal fluorescence microscopic imaging experiments that the probe can permeate through a cell membrane to enter cells and can detect a change of the formaldehyde concentration in the cells, and an effective research tool for researching the physiological action of formaldehyde in the cells is provided.

The invention discloses a method for preparing nitrogen and sulfur-doped fluorescent carbon quantum dots. According to the method, citric acid is taken as a carbon source, L-glutathione is taken as a nitrogen-sulfur dopant, a microwave oven is taken as a reaction platform, the carbon quantum dots with fluorescence properties are prepared in a heating manner, the residues and moisture are removed through dialysis and freeze drying, and quantum dot powder is obtained. The nitrogen and sulfur-doped carbon quantum dots are prepared by adopting the method disclosed by the invention; the method is simple in operation, low in cost, high in yield, simple in preparation process and equipment, free of a solvent, and easy to popularize and produce on a large scale, and can be rapidly finished within a short period of time; and the prepared carbon quantum dots have the advantages of good water solubility, high fluorescence properties, photobleaching resistance, adjustable emission spectrum, good biocompatibility, low cytotoxicity and the like, and have a good application prospect in the fields of bioimaging, biosensors and photo-electric devices.

The invention belongs to the field of biological analysis and detection and relates to fluorescent probes for labelling and / or detecting lipid droplets in cells as well as preparation and applicationsof the fluorescent probes. The probes are synthesized with 4-bromo-1,8-naphthalic anhydride as an initial material and take 1,8-naphthalimide as a fluorophore, a C12 alkyl long chain as a specific lipid droplet positioning group and an N-containing group on the 4th site of a naphthalene ring as a fluorescence enhanced and stabilized group. The probes are simple to prepare and have high yield. Compared with existing Nile red and boron dipyrromethene lipid droplet fluorescent probes, the probes have high light stability and large stokes shift and are more suitable for fluorescence imaging. Theprobes have very important application value in cell labelling fluorescent imaging and biomedical fields.

The invention provides a high-weatherability imitation-wood crust foaming material with high hardness, good toughness, high weatherability and low cost. According to the invention, titanium pigment and an ultraviolet absorbent are added to a common forming material. High weatherability and high thermal stability of rutile type titanium dioxide are utilized; and excellent thermal stability, chemical stability and light stability of the ultraviolet absorbent are utilized. The two materials are adopted in combination in the foaming material, such that the thermolability of the PVC material is effectively reduced, and the weatherability of the foaming material is improved. Organic or inorganic toners are adopted, such that an imitation-wood effect can be achieved through the blending of the toners. With the technical scheme provided by the invention, the appearance of the material is improved; and the use of wood powder is avoided, such that use of wood is reduced. Therefore, the material is beneficial for environmental protection. With the material provided by the invention, the risks during the production and the application processes are reduced.

The invention belongs to the technical field of the preparation of chemical sunscreen agents, and discloses a high-ultraviolet absorption lignin / chemical sunscreen agent microcapsule adopting lignin as a wall material, and a preparation method thereof. The method comprises the following steps: 1, dissolving 1-20 parts by weight of lignin in 100-200 parts by weight of an aqueous solution with the pH value of 12, adjusting the pH value of the obtained solution to 7-10, and filtering out insoluble substances to obtain a lignin solution; and 2, mixing 10-50 parts by weight of the lignin solution obtained in step 1 with 1-10 parts by weight of a chemical sunscreen agent, and carrying out ultrasonic radiation under a power of 200-1500 W for 10 s to 5 min in order to obtain a lignin / chemical sunscreen agent microcapsule emulsion. The lignin / chemical sunscreen agent microcapsule has the advantages of excellent ultraviolet absorption performance, avoiding of light degradation of the chemical sunscreen agent, good stability, effective avoiding of direct contact and damages of the chemical sunscreen agent to skins, and great application prospect in the field of sunscreen and skincare products.

The invention discloses a method for preparing the hydrophobic nano titanium powder. Nano titanium dioxide is firstly conducted the inorganic surface processing in the liquid phase of the nano titanium water dispersion, and then is conducted the organic surface processing, and finally the nano titanium serum is filtered and washed until the electrical conductivity of the filtrate is less than 500 micro simens per centimeter, and is dried and crashed to get the hydrophobic nano titanium dioxide powder. The invention integrates the inorganic and the organic surface processing of the nano titanium dioxide, so that the surface nature of the nano titanium dioxide is changed, and the filtration speed of the nano titanium dioxide in the solid-liquid separation process is increased, and the loss rate of the nano titanium dioxide is reduced, and the craftwork flow process is short, and the operation is convenient and is easy to be controlled. The prepared nano titanium dioxide powder not only has good hydrophobic nature, but also has excellent light stability.

The present invention belongs to the field of nanometer material and biological analysis and detection technology, and is especially preparation process of water soluble CdTe / CdS / ZnS quantum dot in core-shell-shell structure. The preparation process includes mixing zinc salt or zinc oxide with water soluble sulfhydryl compound in water phase, injecting prepared solution of CdTe / CdS in core-shell structure to obtain CdTe / CdS / ZnS precursor solution, setting the precursor solution in a glass tube and performing microwave radiation reaction in a microwave reactor to obtain CdTe / CdS / ZnS quantum dot in core-shell-shell structure. The process is completed in water phase, and is safe and simple. The CdTe / CdS / ZnS quantum dot in core-shell-shell structure has high fluorescence quantum efficiency, high water solubility, excellent stability and high biocompatibility, and may be applied widely in fluorescent marker for biological analysis and detection.