319results about How to "Obvious color change" patented technology

The invention discloses hydrogel photonic crystal microspheres, and a preparation method and an application thereof. The preparation method comprises the steps of (1) preparation of silica emulsion droplets, (2) preparation of silica photonic crystal microspheres, (3) preparation of silica-hydrogel hybrid photonic crystal microspheres, and (4) preparation of inverse-opal-structured hydrogel photonic crystal microspheres. In the step (3), acrylamide, acrylic acid, methylene bisacrylamide and a photo-initiator are allowed to penetrate into the silica photonic crystal microspheres; ultraviolet irradiation is carried out, such that acrylamide and acrylic acid monomers are cured, such that the silica-hydrogel hybrid photonic crystal microspheres are obtained. With the method provided by the invention, the obtained hydrogel photonic crystal microspheres have a three-dimensional ordered porous structure, wherein the pores have a compact hexagonal stacking ordered structure. With the method, technical problems of angle dependence and slow response to small molecules of existing hydrogel photonic crystal films can be solved.

The invention discloses a colorimetric detection method of hydrogen peroxide. The colorimetric detection method comprises the following steps: mixing a sample solution containing hydrogen peroxide with a molybdenum disulfide solution, a color developing agent and a buffer solution, and measuring the content of the hydrogen peroxide in the sample by adopting a visual colorimetry or an ultraviolet-visible spectrophotometer after reaction. According to the colorimetric detection method, the chromogenic reaction of the hydrogen peroxide and the color developing agent is catalyzed by using molybdenum disulfide as a catalyst to detect the hydrogen peroxide, and the concentration of the hydrogen peroxide is semi-quantitatively determined by adopting a visual colorimetry, or the concentration of the hydrogen peroxide is quantitatively determined by adopting an ultraviolet spectrophotometer. According to the colorimetric detection method, the problems of high operation requirement for detection of the hydrogen peroxide, complicated detection process, high detection cost, long detection time, large background interference and the like in the prior art can be solved. The colorimetric detection method disclosed by the invention is low in cost, simple and convenient to operate, and capable of realizing visible quick detection of the hydrogen peroxide.

The invention discloses a fluorescent probe for detecting hydrogen sulfide (H2S) and hypochlorous acid (HClO) in cell lysosomes simultaneously or respectively as well as a preparation method and application of the fluorescent probe, and belongs to the field of analytical chemistry. The molecular formula of the probe disclosed by the invention is C44H43N9O7, and the structural formula of the probe is shown in the formula (I). According to the invention, multiple target molecules (H2S, HClO and H2S/ HClO) are simultaneously or respectively detected by a single probe, and different signal responses can be produced for different target molecules. The probe of the invention has the specificity of selecting H2S and HClO, and strong capacity of resisting interference of other molecules. The fluorescent probe disclosed by the invention can be applied to detection of H2S and HClO in a water environment and a cellular level, is a simple, fast and sensitive molecular specificity detection reagent of H2S and HClO and has broad application prospects in the field of biomolecule detection.

The invention relates to a fine roughing treatment technology for the surface of electrolytic copper foil. The fine roughing treatment technology includes the following processes of primary roughing, secondary roughing, primary curing, secondary curing, third-level roughing, zinc and nickel alloy plating, oxidization preventing, silane coupling agent treating and drying. The copper foil produced through the technology has relatively low surface roughness, meanwhile has very high stripping resisting strength, especially shows excellent bonding strength on plates of Tg 170 or above and is very suitable for low-loss and ultra-low-loss high-speed circuit boards. Key technology indexes of the copper foil produced through the technology reach the level of the same kind of products of advanced copper foil manufacturers such as Mitsui Mining and Smelting (MHT), Furukawa Electric (MP) and JX Nippon Oil (JTC-LC), replaces imported copper foil of the same kind and is applied to high multi-layer high-end plates, HDI high-end plates, halogen-free high-end plates and other high-end plates in China or Euramerican countries.

The invention belongs to the technical field of functional polyurethane materials and in particular relates to a composition as well as a preparation method and application thereof to a force-induceddiscoloration material field. The invention provides the composition and the composition is prepared from the following raw materials: dihydroxyspiropyran, polyol, an organic amine type catalyst, diisocyanate, a chain extender and a crosslinking agent. The invention further provides the preparation method of the composition and also provides the application of the composition or a product obtainedby the preparation method to the force-induced discoloration material field. tensile experimental determination can show that color changes of the product prepared by the technical scheme are remarkable before and after stretching; meanwhile, the composition has good tensile strength and the tensile performance index is better than that of a reference substance. According to the composition as well as the preparation method and the application thereof to the force-induced discoloration material field, provided by the invention, the technical defects of a polyurethane based force-induced discoloration material in the prior art of poor force responsiveness and insensitive discoloration are solved.

The invention discloses a photonic crystal hydrogel membrane with pH value and ionic strength response, a preparation method and an application thereof. The photonic crystal hydrogel membrane comprises Fe3O4 nano particles and polyacrylamide-methacrylate acetic acid hydrogel, wherein the Fe3O4 nano particles are uniformly dispersed in the hydrogel and are arranged in a one-dimensional chain shape, and the concentration of the nano particles in the membrane is 1 to 50 mg/mL. The preparation method of the photonic crystal hydrogel membrane comprises the steps of uniformly mixing the Fe3O4 nano particles and hydrogel monomers, so as to generate curing reaction through ultraviolet light, and soaking in a soluble carbonate aqueous solution at last, so as to obtain the required membrane. The preparation method has the advantages of simplicity in operation, strong repeatability and convenience in large-scale preparation, the carboxyl quantity of the obtained membrane is controllable, the membrane is monochromatic, obvious color change occurs under the stimulation of pH value or ionic strength, and naked-eye detection is facilitated.

The invention discloses a mine protecting suit fabric with synergetic functions of bacteria resisting, static resisting, toxic gas monitoring and dust poison filtering and a preparation method thereof. The protecting suit material comprises a body protecting fabric, a sterilization protecting suit fabric and a gasochromic protecting suit fabric, wherein the body protecting fabric comprises a pieceof base cloth which is processed by MXene conductivity and an MXene filtering layer of which the surface comprises hydrophilic functional groups which can be reacted with mine toxic gas and a wear and static resisting hydrophobic layer, the body protecting fabric is taken as the body of a protecting suit, a function fabric which is modified by a dispersing agent and a silver nanowire sterilization agent is adopted by the parts of collar, sleeves and the like where bacteria are easily bred of the protecting suit, and therefore the bacteria can be effectively killed; an outer layer which has agasochromic protecting function is adopted by the sleeves so that mining workers can be warned because the color on a gasochromic layer is significantly changed when encountering mine toxic gas, and therefore mine operation safety is ensured.

The invention discloses an electrochromic device based on ZnO nanotubes and a preparation method thereof. The electrochromic device comprises a working electrode, a counter electrode, and electrolyte, wherein the working electrode is ITO glass and is coated with a methyl viologen modified ZnO nanotube array, and the counter electrode is ITO glass or ITO glass coated with a NiO film. The preparation method comprises the steps of working electrode preparation, counter electrode preparation, electrolyte preparation and electrochromic device packaging. For working electrode preparation, first, a ZnO nanorod array is prepared by a hydrothermal method, then, the ZnO nanorod array is eroded by KOH solution into a nanotube array, and finally, the nanotube array is modified with small molecules of methyl viologen. The electrochromic device of the invention has high stability and obvious color change, and has a great advantage in the aspect of making intelligent discoloring windows, displays, electronic paper and the like.

The invention discloses a coumarin-benzothiazolyl hydrazone compound, a preparation method and application thereof. Specifically, the structural formula of the coumarin-benzothiazolyl hydrazone compound is shown as the specification. The hydrazone fluorescent probe compound provided by the invention has multifunctionality, also can realize identification and quantitative detection of Cu<2+> ions by visible spectrophotometry and fluorescent spectrometry, and has good anti-interference performance, high selectivity and sensitivity in the presence of other ions.

The invention belongs to the technical field of analytical chemistry and particularly relates to a type of hypochlorous acid detection fluorescent probes and a preparation method and application thereof. The compounds have excellent selectivity of hypochlorous acid and are unresponsive to other common active oxygen/active nitrogen. The hypochlorous acid detection fluorescent probes are high in hypochlorous acid selectivity and sensitivity, and recognition with naked eyes instead of complicated instruments can be realized after response to hypochlorous acid; hypochlorous acid recognition in in-vivo level can be realized, and obvious color changes can be observed. The compounds can serve as the fluorescent probes to be applied to fields of hypochlorous acid detection, fluorescence imaging and the like.

The invention relates to the fields of chemical industry and materials, specifically to the field of electrochromic materials, more specifically to a viologen compound, and a preparation method and application thereof. Specifically, the viologen compound is as shown in a formula I which is described in the specification. The invention also relates to a viologen electrochromic material and an electrochromic device. The electrochromic material prepared in the invention has obvious color changes during coloring and fading and has certain cyclic stability and good application prospects.

The invention discloses a four-color high-fidelity printing process capable of realizing network low-precision pictures, belongs to the technical field of printing, and can realize the printing of a network 'low-precision picture, four-color printing high-definition and high-fidelity picture album 'by means of image collection, conversion, interpolation amplification and image leveling. Accordingto the method, the low-precision RGB picture can be randomly selected, and certainly, the high-precision RGB picture is better, that is, the selection range is wider; the high-fidelity printing colorgamut is expanded by more than 30% compared with the conventional four-color printing, so that the capability of expressing bright colors is greatly improved, the printing color gradation linearity ismore accurate, and the capability of expressing color depth change is enhanced; the adjustment of the brightness order linearity not only enables the color change in the dark tone color to be more obvious, but also enables the stereoscopic impression of a printed image to be enhanced.

The invention provides a fluorescence chemical sensor and a preparation method and application thereof. The structural formula of the fluorescence chemical sensor is shown as the formula (I), wherein R1 refers to sulfur or oxygen; and R2 refers to sulphonate, iodate, fluorphosphate or fluoborate. The preparation method for the fluorescence chemical sensor comprises the following steps of: (1) performing oxidation reaction on 4'-(N,N-dimethyl pyridyl amido)benzene under the action of an oxidant to obtain 4'-(N,N-dimethyl pyridyl amido)benzaldehyde; (2) reacting the 4'-(N,N-dimethyl pyridyl amido)benzaldehyde with a compound in a formula (III) to obtain a compound in a formula (II); and (3) reacting the compound in the formula (II) with copper ion-containing inorganic salt to obtain the fluorescence chemical sensor, wherein in the formulas (II) and (III), R1 refers to sulfur or oxygen; and R2 refers to sulphonate, iodate, fluorphosphate or fluoborate. The fluorescence chemical sensor can specifically, efficiently, timely and easily detect cyanide ions in aqueous solution.

The invention discloses a cat urine pH indicating material, a pH indicating cat litter and a preparation method thereof. The cat urine pH indicating material takes one or more of common soybean curb residues, common starch, starch fiber, modified starch, plant fibers, dextrin and flour as carriers and contains a pH value mixed indicator which accounts for 0.001-2% of the total weight of the pH value indicating material, and the pH value mixed indicator comprises, by weight, m-methyl red or methyl red and an indicator A with the weight ratio of 1 to (1-15). The pH indicating cat litter consistsof the pH indicating material and basic bean curd cat litter, wherein the pH indicating material accounts for 1-100% of the total weight of the cat litter. The consistency of the pH indicating material carrier and the basic cat litter in the material is guaranteed, so that the pH indicating material in the bean curd cat litter product is uniformly distributed, and the pH value of cat urine can beinstantly, accurately and stably indicated. The cat urine pH indicating material and the pH indicating cat litter are low in production cost, non-toxic and non-radioactive, the preparation process issimple and feasible, and the cat urine pH indicating material and the pH indicating cat litter have the advantages of no dust, good degradability, convenient use, environmental friendliness and the like.

The invention provides a long-chain p-nitrobenzoylhydrazone gelator. One side of the gelator is three long alkyl chains which have 16 C and are obtained through etherification, and the three long alkyl chains can form initial driving force for gelation through mutual action among carbon hydrogen; middle -NH obtained through a hydrazinolysis reaction can form stable gel with -CH and C=O adjacent to -NH through action of intermolecular hydrogen bonds and can also form corresponding binding sites with metal ions through coordination so as to further form the organic metal gel; the formed organic metal gel can realize rapid highly-selective fluorescent recognition of I<-> in water and is obvious in color changes, which enables detection with the naked eyes to be conveniently and rapidly realized; and the formed organic metal gel has good stability, is easy to store and carry and convenient to use and can be used for writing and storage of confidential materials.

The invention discloses a method for preparing an anionic colorimetric sensing cellulosic material. A titanium dioxide film is deposited on the surface of filter paper cellulose by taking natural cellulose fiber material as a matrix, and taking tetrabutyl titanate as a precursor by a surface sol-gel process; a fluoride ion colorimetric sensing cellulosic material is obtained by introducing a fluoride ion-sensitive ligand alizarin complexant molecule single layer in a self-assembly way; and fluoride ions in solution can be detected by infiltrating the material prepared by the invention in the aqueous solution of anions for a certain period of time simply, and observing the color change of the material. The anionic colorimetric sensing cellulosic material prepared by the invention has the advantages of high sensitivity and selectivity to the fluoride ions, abundant material sources, low cost, simple preparation method and simple, rapid and economic fluoride oil detection.

The invention discloses a colorimetric detection method for the activity of telomerase based on a silver nanoprobe. The silver nanoprobe comprises silver nanoparticles and blunt-end hybrid duplexes modifying the surfaces of the silver nanoparticles. Each of the hybrid duplexes is formed by hybridization of single-stranded DNAs and a nucleotide sequence complementary to the single-stranded DNAs; the single-stranded DNAs are formed by successive connection of a continuous cytosine strand, a spacer strand and a telomerase-binding substrate strand; and the nucleotide sequence is completely complementary to the telomerase-binding substrate strand. The surfaces of the silver nanoparticles are modified by the hybrid duplexes in virtue of the continuous cytosine strands. The silver nanoprobe prepared in the invention is liable to aggregation and displaying of grayness due to rigid structures of double-stranded DNAs on the surfaces of the silver nanoparticles and stacking effect of the blunt ends on the surfaces of the silver nanoparticles; under the action of telomerase, the telomerase-binding substrate strands are allowed to extend, so swinging DNA terminals are formed on the surfaces of the silver nanoparticles, which enables the silver nanoparticles to have better stability; and the silver nanoparticles are tend to be disperse and to display a yellow color.

The invention belongs to the technical field of food processing, and in particular relates to a corn fiber gel-protein emulsifier and a preparation method thereof. The emulsifier comprises corn fiber gel and protein in a ratio of 0.25-10 (in mass ratio). The preparation method comprises the following steps: preparing a buffer liquid, preparing a corn fiber gel solution, preparing a protein solution, preparing a H2O2 and peroxidase solution, preparing a corn fiber gel and protein copolymer, standing, performing enzyme deactivation, concentrating and freeze-drying. The emulsifier is simple and convenient in processing and high in efficiency, the emulsification property of the corn fiber gel under different environment conditions (pH value/ion strength/temperature) is effectively improved, and meanwhile the copolymer of the corn fiber gel-protein is not remarkably changed in color and is free of adverse odor.

The invention discloses a preparation method and an application of a rapid detection kit for a copper-containing nanorod compound. The method comprises the following steps of preparing the copper-containing nanorod compound; adding glucose solutions with different concentrations into a centrifuge tube, adding glucose oxidase, adding the copper-containing nanorod compound and a color developing agent, adjusting the pH value, obtaining a standard curve with a good linear relation according to a relation between an absorbance value of the color developing agent at the wavelength of 652nm and theglucose concentration, and based on this, performing calculation to obtain the glucose content in a to-be-detected sample; and adding the copper-containing nanorod compound connected with an INS-aptamer into the centrifuge tube, adding insulin with different concentrations, adding a hydrogen peroxide solution and the color developing agent (TMB), obtaining a standard curve with a good linear relation according to a relation between the absorbance value of the color developing agent at the wavelength of 652nm and the insulin concentration, and based on this, performing calculation to obtain theinsulin content in the to-be-detected sample. The kit also can be used for distinguishing type 1 diabetes and type 2 diabetes. The method is obvious in phenomenon, easy and convenient in operation, high in sensitivity, and accurate and effective.