80 results about "Benzidines" patented technology

The invention belongs to the technical field of polymer adsorbent materials, and particularly relates to an ionic polymer adsorbent material containing sulfonic groups and triazinyl, a preparation method and application thereof. A sulfonic acid group is introduced to a molecular structure unit of the nitrogen-rich polymer, and the specific surface area and the ion capacity of the polymer are controlled by adjusting the content of benzidine disulfonic acid; along with the increase of the proportion of benzidine disulfonic acid, the ion capacity of an adsorbent is gradually increased, the specific surface area is gradually reduced, the invention also discloses application of the ionic polymer containing sulfonic acid and triazinyl structure in dye adsorption, and the prepared polymer has high specific surface area, heat-resistant stability, adsorption performance and adsorption regeneration performance.

The invention belongs to the technical field of sensors, and relates to an array sensor based on cerium-based metal organic framework nano-enzyme and detection application of perfluoroalkyl compounds. The array sensor is a Ce-MOF triple enzyme activity array sensor and is provided with a plurality of mutually independent sensing channels; the sensing channel contains a Ce-MOF nano enzyme and a chromogenic substrate; the chromogenic substrates comprise a first chromogenic substrate, a second chromogenic substrate and a third chromogenic substrate, the first chromogenic substrate comprises 3, 3 ', 5, 5'-tetramethyl benzidine, the second chromogenic substrate comprises 2, 4-diaminophenol and 4-aminoantipyrine, and the third chromogenic substrate comprises xanthine, purine oxidase and nitrogen blue tetrazole. The MOF nano-enzyme array sensor constructed by the invention has relatively high sensitivity and selectivity in identification and distinguishing of PFASs compounds, not only can accurately distinguish single PFASs compounds, but also can perform quantitative detection, and has good response to PFASs with different concentrations.

The invention discloses a nano-enzyme-SERS (Surface Enhanced Raman Scattering) bifunctional sensor for detecting colorectal cancer markers with high sensitivity as well as a preparation method and application of the nano-enzyme-SERS bifunctional sensor. The preparation method comprises the following steps: coating a layer of platinum (Pt) on the surface of gold nanoparticles (AuNPs) by utilizing a chemical reduction method so as to form gold-platinum nanoparticles (Au (at) Pt NPs); assembling the synthesized Au (at) Pt NPs into an aminated capillary tube through electrostatic adsorption, so as to prepare a capillary tube SERS (Surface Enhanced Raman Scattering) substrate; the surface of Au (at) Pt NPs is modified with a marker aptamer through an Au-S bond, and the nano enzyme-SERS dual-function sensor is prepared. In the presence of hydrogen peroxide (H2O2), the Au (at) Pt NPs can catalyze the oxidation of 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) to generate oxidized TMB (oxTMB) with a strong SERS (Surface Enhanced Raman Scattering) signal. When Hcy exists, the reductive sulfydryl of Hcy consumes hydroxyl free radicals (. OH) generated by H2O2 decomposition, so that TMB oxidation is inhibited, and SERS signal intensity is weakened. A linear regression equation of the logarithm of the Hcy concentration and the signal intensity is drawn according to the SERS signal intensity, so that quantitative detection of the Hcy is realized.

The invention discloses a machine learning enhanced silver-based covalent organic framework nano-enzyme colorimetric detection method and application thereof, and constructs a nano-enzyme which is formed by loading silver nanoparticles on a covalent organic framework and has oxide-like enzyme activity, and the nano-enzyme is used for rapid visual detection of mercury ions. When mercury ions exist, silver ions in the COF-AgNPs can form silver amalgam with the mercury ions, so that a colorless substrate 3, 3 ', 5, 5'-tetramethyl benzidine is catalyzed to generate a blue oxidation product oxTMB. And the mercury content can be judged by detecting the absorbance and RGB value change of the chromogenic reaction. And meanwhile, a machine learning data analysis strategy of a support vector machine model is adopted to carry out five-fold layered cross validation analysis on the obtained absorbance value and RGB value, so that the detection range is expanded, and the detection sensitivity is improved.

The invention belongs to the technical field of tin ion detection, and provides a method for detecting tin ions based on Ce-UiO-66-NO2 nano enzyme. The method comprises the following steps: mixing Ce-UiO-66-NO2 nano-enzyme with colorless 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) to generate blue oxidation-state TMB, then adding a sample containing tin ions (Sn < 2 + >), and reducing the oxidation-state TMB by utilizing the strong reducibility of the tin ions (Sn < 2 + >), so that the color of the solution becomes light; the tin ions (Sn < 2 + >) are qualitatively detected according to color change, or the tin ions (Sn < 2 + >) are quantitatively detected by utilizing a linear relation between the change of the absorbance value of the solution before and after the tin ions (Sn < 2 + >) are added and the concentration of the tin ions (Sn < 2 + >). The method has the advantages of low detection limit, high selectivity and good stability, and realizes the purpose of rapid detection of tin ions in tap water.

The invention relates to the technical field of analytical chemistry and food pharmacy detection, in particular to a rutin antioxidant activity colorimetric determination method based on a composite nano enzyme, which comprises the following steps: mixing a to-be-detected sample solution with an ABTS free radical cation working solution to carry out first reaction, so that an antioxidant substance in a sample and ABTS free radical cations are subjected to scavenging reaction; adding the composite nano enzyme, a 3, 3 ', 5, 5'-tetramethyl benzidine solution and a hydrogen peroxide solution into a system after the first reaction is completed, and initiating a second reaction; and measuring the absorbance value of the system after the second reaction under a specific wavelength, comparing the absorbance value with the standard curve obtained through the treatment in the same step, and calculating the antioxidant activity expressed by the equivalent concentration of rutin in the sample to be detected. By optimizing reaction conditions, the method provided by the invention simplifies operation steps and can provide accurate measurement results in a wider concentration range.

The invention provides a high-entropy nano enzyme. The chemical formula of the high-entropy nano enzyme is Mn < 0.4 > Co < 0.4 > Ni < 0.4 > Cu < 0.4 > Zn < 0.4 > Fe < 2.0 >) O. The invention also provides a preparation method of the high-entropy nano-enzyme, which comprises the following steps: dissolving manganese nitrate tetrahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, copper nitrate trihydrate, zinc nitrate hexahydrate and sodium citrate in deionized water to prepare a clear solution A; dissolving potassium ferricyanide in deionized water to prepare a clear solution B; directly pouring the solution B into the solution A, stirring, standing and aging the obtained mixed solution at room temperature, and centrifugally collecting a product; and calcining the sample powder in a muffle furnace to obtain the high-entropy nano-enzyme. The invention further provides a catalyst which is composed of the high-entropy nano enzyme, 3, 3 ', 5, 5'-tetramethyl benzidine and H2O2. The invention also provides a method for detecting reduced glutathione by using the microfluidic paper chip analysis device. The invention provides a new normal form for constructing a multifunctional biosensing and environment monitoring platform.

The present invention aims to provide polyimides and molded articles such as films that are environmentally safe, soluble in organic solvents, and have excellent transparency. [Solution] The above problem can be solved by a polyimide having a tetracarboxylic dianhydride component and a diamine component, wherein the diamine component includes a fluorine atom-containing diamine having a CF3-O- structure selected from 2,2'-bis(trifluoromethoxy)benzidine, 3,3'-bis(trifluoromethoxy)benzidine, and / or 2,3'-bis(trifluoromethoxy)benzidine, and the tetracarboxylic dianhydride component includes a tetracarboxylic dianhydride having a fluorene structure and an alicyclic tetracarboxylic dianhydride.

The invention discloses a method for preparing high-purity 3,3'-diaminobenzidine by a two-step temperature increase method, which relates to the technical field of preparation of benzidine compounds. The preparation steps are: two-step temperature increase reaction: 3,3'-dichlorobenzidine hydrochloride, copper salt, water and liquid ammonia are added sequentially in a stainless steel autoclave, and a two-step temperature increase reaction is performed; filtration crystallization: filtering to obtain a dark brown ammoniate, hot melting, hot filtering, cooling crystallization to obtain a crude product; purification: the crude product is added with water, activated carbon and ammonium thiohydrochloride, fully dissolved and filtered, the filtrate is slowly cooled and crystallized to obtain a relatively pure product, and the purification step is repeated multiple times to obtain high-purity 3,3'-diaminobenzidine. The advantages of the present invention are: a two-stage temperature increase preparation method is adopted to reduce impurity generation and obtain a high-purity product; purification uses ammonium thiohydrochloride as an antioxidant to reduce the generation of oxidative impurities, improve purity, and purified wastewater can be applied, with good economy and environmental protection, and with a high yield.

The application discloses a preparation method of carbon dot nanometer enzyme, which comprises the following steps: dissolving oxalic acid, polyacetyl imine and ferric nitrate in ultrapure water, heating and mixing, cooling to room temperature, centrifuging, filtering, dialyzing and taking supernatant to obtain the carbon dot nanometer enzyme; and a double-mode detection method for colorimetric and fluorescent detection of glyphosate in fruits and vegetables is constructed by using the prepared oxalic acid carbon dot nanometer enzyme, acetylcholinesterase, acetylcholine, 3,3',5,5'-tetramethyl benzidine and H2O2. The oxalic acid carbon dot nanometer enzyme is prepared by doping ferric nitrate and tetraethylenepentamine with oxalic acid as a precursor, has excellent peroxidase-like activity, and a colorimetric and fluorescent double-mode detection method for glyphosate is constructed by using the oxalic acid carbon dot nanometer enzyme, the double-mode detection results can be verified with each other, and the accuracy and reliability of the detection results are significantly improved.

The invention relates to the field of high polymer materials, in particular to an oil-water-resistant polyimide resin insulating material and a preparation method thereof.The oil-water-resistant polyimide resin insulating material comprises a polyimide precursor, core-shell structure inorganic filler and a DMAc / NMP mixed solvent, and the polyimide precursor is prepared from ODA, BPDA, PMDA and 2, 3, 4-triazole. 2, 2-bis (trifluoromethyl) benzidine is prepared through segmented feeding and polymerization; the core-shell filler takes silicon dioxide as a core and is grafted with an amino silane and fluoroalkyl silane double-coupling layer. The preparation method comprises the steps of core-shell filler synthesis, staged polymerization, ultrasonic dispersion and three-stage gradient curing. The material forms a gradient cross-linked network with a compact surface and a loose interior, after the material is soaked in ATF oil containing 0.5% of water at 155 DEG C for 2000 h, the weight change rate is smaller than or equal to 1.2%, the insulation resistance retention rate is larger than 95%, and the material has excellent oil-water erosion resistance, insulativity and mechanical property and has wide application prospects.

The invention discloses a polyamide semi-solid electrolyte, which comprises polyamide, a lithium salt and an electrolyte, wherein the polyamide is obtained by polymerizing polybasic acyl halide, 4, 4 '-diamino-2, 2'-bis (trifluoromethoxy) benzidine and a diamine monomer 1; the diamine monomer 1 is at least one of amino-terminated polyethylene glycol and amino-terminated polysiloxane. The invention also discloses a preparation method of the polyamide semi-solid electrolyte, which comprises the following steps: carrying out polymerization reaction on 4 '-diamino-2, 2'-bis (trifluoromethoxy) benzidine, a diamine monomer 1 and polybasic acyl halide in an organic solvent, and adding proline to remove HCl so as to obtain a polyamide solution; then adding lithium salt into the polyamide solution, and uniformly mixing to prepare a thin film; and soaking or wetting the thin film with an electrolyte to obtain the polyamide semi-solid electrolyte with high lithium salt content. The invention also discloses an application of the polyamide semi-solid electrolyte. The fabric has high ionic conductivity.

This invention discloses a method for preparing covalent organic framework microcapsules immobilized enzymes and their applications. Using sodium polystyrene sulfonate-doped calcium carbonate as a template, polyethyleneimine and enzyme molecules are sequentially adsorbed onto the calcium carbonate surface based on electrostatic interactions. Trialdehyde phloroglucinol and benzidine are simultaneously added to the calcium carbonate template with the adsorbed enzyme. Based on the enzyme-induced catalytic effect, covalent organic framework microcapsules are generated on the calcium carbonate surface. After post-treatment to remove the calcium carbonate template, the covalent organic framework microcapsule immobilized enzyme is finally obtained. When used for the conversion of pyruvate to lactate, the immobilized enzyme activity retains 70% of the free enzyme activity. After eight cycles, the immobilized enzyme activity still retains 89% of the initial activity, exhibiting high immobilized enzyme activity and stability. The preparation method is simple, environmentally friendly, and has significant application potential.

The invention provides a method for detecting the total antioxidant capacity of saliva based on iron-based MOF nano-enzyme, and belongs to the field of biosensing. The method comprises the following steps: obtaining an MIL-53Fe nano enzyme; the preparation method comprises the following steps: mixing a diluent of MIL-53Fe nano-enzyme, a sodium acetate buffer solution, 3, 3 ', 5, 5'-tetramethyl benzidine and hydrogen peroxide for reaction, adsorbing a reaction solution by using filter paper, drying and curing by using a chitosan solution to obtain the visual microfluidic detection paper-based chip. Establishing a standard curve of the chromatic value and the ascorbic acid concentration; dropwise adding the treated saliva sample onto the paper-based chip, standing for reaction to obtain a chromatic value, and calculating according to the standard curve to obtain the total antioxidant capacity value of the saliva. Complex matrix interference is broken through, the detection sensitivity and portability are improved, and therefore clinical application of saliva TAC detection in noninvasive health monitoring is promoted.

The invention discloses a pentagonal porphyrinyl covalent organic framework material as well as a preparation method and application thereof. According to the material, 5, 10, 15, 20-tetra (4-aminophenyl) nickel porphyrin and N, N '-bis (4-formylphenyl)-N, N'-diphenyl benzidine are used as construction units, and a two-dimensional covalent organic framework structure with pentagonal pore topological characteristics is formed through a Schiff base condensation reaction. Ni-N4 coordination structures which are uniformly distributed in the material construct catalytic sites similar to a natural enzyme active center in a non-uniform pore microenvironment, and the material shows excellent and stable peroxidase-like catalytic activity. The preparation method of the material has the advantages of clear process steps and mild reaction conditions, and is suitable for stable and repeated preparation. A catechol inhibition type colorimetric sensing system constructed on the basis of the material has good analysis performance in the aspects of detection linear range, detection limit and the like and does not need to depend on large-scale instruments and equipment, and a detection result can be observed through naked eyes.

This invention provides a diazobiphenyl dye for thin-film polarizers, which is an analog of AD1. Thin-film polarizers prepared using this dye exhibit good optical quality, such as low light scattering, high dichroism ratio, broadband absorption, and / or stability to heat and light irradiation. This invention also provides a method for preparing the diazobiphenyl dye from two different monoazo dyes via a cross-coupling reaction. This method is eco-friendly because it does not use toxic benzidine as a raw material. The product (diazobiphenyl dye) obtained by this method can be purified in a simple and convenient manner, and the diazobiphenyl dye prepared by this method can have a symmetrical or asymmetrical structure. Furthermore, this invention provides a thin-film polarizer comprising the diazobiphenyl dye and an apparatus for display applications comprising the thin-film polarizer.

The application discloses an electrochemical biosensor based on specific nucleic acid aptamer fragments and glucose oxidase. The specific recognition of the same target object by the double nucleic acid aptamer is utilized to combine the modified metal organic framework compound and the magnetic nanoparticles with the target object to form a self-assembly structure, and the magnetic nanoparticles are separated out by utilizing the magnetism of the magnetic nanoparticles. Meanwhile, the specific catalytic action of the glucose oxidase on glucose produces hydrogen peroxide to further oxidize 3,3'-diamino benzidine to generate an electrochemical signal, and the metal organic framework compound and the magnetic nanoparticles both have peroxidase-like activity, which can further synergistically catalyze the oxidation of 3,3'-diamino benzidine by hydrogen peroxide, and the sensitivity is improved. Thus, based on the linear relationship between different concentrations of pathogen solutions and corresponding electrochemical signal intensities, the electrochemical biosensor realizes high-sensitivity detection of the hyacinth yellow rot fungus.

The invention discloses a nanogold and wood composite material, a preparation method, application and a method for determining the content of glucose in reconstituted tobacco, glucose oxidation is directly catalyzed through the nanogold and wood composite material (AuNPs and wood), the glucose and tetramethyl benzidine (TMB) are subjected to a chromogenic reaction, and the content of the glucose in the reconstituted tobacco is determined by combining the linear relation between absorbance and the glucose concentration. And whether the glucose exists in the reconstituted tobacco and the concentrated solution sample or not and the specific content of the glucose can be accurately judged. The method provided by the invention can quickly obtain a detection result within 30 minutes, is suitable for efficiently screening reconstituted tobacco and concentrated solution samples with the glucose content lower than 0.01 gL <-1 >, can accurately determine the actual content of glucose in the reconstituted tobacco and the concentrated solution, does not need to depend on a standard substance or carry out modeling maintenance, and is simple and convenient to operate. The equipment cost is obviously reduced; and the operation process is simplified.

The invention discloses a colorimetric-fluorescence dual-mode detection method for salmonella and escherichia coli, and belongs to the technical field of biological detection. According to the invention, concanavalin A (ConA) is coupled with magnetic nanoparticles (MNPs) to form MNPs (at) ConA as a capture probe by recognizing the characteristic of capturing bacteria by sugar residues, and in addition, an antibody (Ab) can specifically recognize bacteria and is coupled with quantum dots (QDs) to form QDs (at) Ab as a fluorescence signal probe. The invention finds that MNPs can catalyze 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) to generate blue oxTMB which can be observed by naked eyes; and the QDs have strong fluorescence and can also be observed by naked eyes, so that obvious distinguishing is realized in Sal and Esc detection. And the signal is linearly related to the target bacteria, so that the visibility is good. The practicability of the method is verified by detecting milk tea, milk and fruit juice samples, and the recovery rate is 93.5-106%. The feasibility of detecting Sal and Esc by the method is verified, and the method has important application potential in food safety monitoring.

The invention provides a silane coupling polymer membrane for H2 / CO2 separation as well as a preparation method and application of the silane coupling polymer membrane. Soaking the support body in a 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane aqueous solution, taking out the support body, and naturally airing the support body until no obvious liquid drops exist on the surface of the support body; soaking the support body in a mixed water phase solution containing 3, 3 '-diaminobenzidine and melamine, removing redundant water phase solution after a period of time, and naturally airing; then soaking in a mixed organic phase solution containing paraphthaloyl chloride and trimesoyl chloride, and carrying out interfacial polymerization reaction on amino and acyl chloride on the surface of the support body to generate an initial polymer membrane; and then putting into a drying oven for heat treatment to obtain the final silane coupled bibenzimidazole and amide connected polymer film. The H2 permeability of the membrane under the conditions of 200 DEG C and 1 bar is 225 GPU, and the H2 / CO2 selectivity is 101. The method is simple to operate and short in preparation period; the gas separation performance is excellent at high temperature and high pressure, and large-scale preparation is easy.

The application discloses a kit for detecting transferrin and application thereof, and belongs to the technical field of transferrin content detection. The kit comprises a PBA-SiO2@Fe3O4 magnetic affinity probe and an Ab-Au, Pt, Cu@PDA nanoscale enzyme immune probe. When the transferrin exists, the PBA-SiO2@Fe3O4 magnetic affinity probe and the Ab-Au, Pt, Cu@PDA nanoscale enzyme immune probe are combined with the transferrin to form a sandwich structure similar to a sandwich. The catalytic performance of the Ab-Au, Pt, Cu@PDA nanoscale enzyme and the Raman enhancement activity of Au, Pt and Cu metal are utilized to make the substrate produce an oxidation product 3,3',5,5'-tetramethyl benzidine diimine with color developing capability, a novel transferrin multi-mode sensing platform with rapidness, sensitivity, selectivity and high reliability is established, and the visual sensing analysis can realize rapid semi-quantitative on-site detection of transferrin in samples. The method can be applied to on-site rapid detection of low-concentration transferrin in sweat, blood, urine and other samples.

The invention belongs to the technical field of biosensors, and discloses a preparation method and application of a polyacid / hydrotalcite composite mimic enzyme. According to the invention, the P2W18O62 / CoAl-LDH composite material is prepared and is applied to the colorimetric reaction process of 3, 3 ', 5, 5'-tetramethyl benzidine, so that the detection of H2O2 and AA is realized. AA can be used as a reducing agent in the system and can reduce blue oxTMB into colorless TMB. On the basis, a rapid and sensitive TMB / H2O2 / P2W18O62 / CoAl-LDH colorimetric sensing system is established to detect the AA. The linear detection range of AA is 10 to 50 mol / L, and the detection limit is 12.5 mol / L. The sensing system shows excellent selectivity, and the TMB / H2O2 / P2W18O62 / CoAl-LDH sensing system is used for detecting the AA in an actual fruit sample.

The invention discloses a preparation method and application of a piezoelectric composite film based on organic charge transfer eutectic, and the preparation method comprises the following steps: uniformly mixing organic charge transfer eutectic or eutectic components forming the organic charge transfer eutectic with polyvinylidene fluoride and a copolymer solution thereof to obtain a mixed solution, the piezoelectric composite film is prepared through electrostatic spinning; the eutectic component comprises an electron donor molecule and an electron acceptor molecule, the electron donor molecule is a polycyclic or heterocyclic aromatic molecule or benzidine molecule with a pi conjugated structure, and the electron acceptor molecule is an organic conjugated small molecule with a quinoneform structure or an aromatic molecule containing a cyano group. The piezoelectric composite film prepared by the method shows excellent flexibility, piezoelectric effect, long-term stability and the like, and a flexible piezoelectric device prepared by using the piezoelectric composite film as a piezoelectric layer has high output voltage, sensitive response and excellent stability, and can be used in the fields of low-quality energy collection and wearable sensors.

The present invention aims to provide polyimides and molded articles such as films that are environmentally safe, soluble in organic solvents, and have excellent transparency and mechanical properties. [Solution] The above problem can be solved by a polyimide having a tetracarboxylic dianhydride component and a diamine component, wherein the diamine component includes a fluorine atom-containing diamine having a CF3-O- structure selected from 2,2'-bis(trifluoromethoxy)benzidine, 3,3'-bis(trifluoromethoxy)benzidine, and / or 2,3'-bis(trifluoromethoxy)benzidine, and the tetracarboxylic dianhydride component includes an acid dianhydride having an ether bond and an alicyclic tetracarboxylic dianhydride.

The application relates to the technical field of titanium dioxide, and discloses a preparation process of surface-modified porous titanium dioxide and application thereof. The porous titanium dioxide has a large number of pore structures, a large specific surface area, and many adsorption sites, and is grafted with a hydroxyl-containing histidine-based polyamide containing a salicylaldehyde Schiff base structure, an imidazole structure and a polyamide structure, can have a strong coordination with Pb 2+ , Hg 2+ , and thus has excellent adsorption performance. 3,3'-diamino-benzidine is used as a polymerization monomer, the benzidine structure has heat resistance, the benzidine structure is introduced into the main chain of the polyamide after polymerization, the polyamide has excellent high-temperature resistance, the polyamide molecular chain does not pyrolyze at high temperature, the surface-modified porous titanium dioxide adsorbent still has high adsorption efficiency, and the surface-modified porous titanium dioxide adsorbent can meet the actual application of the adsorbent in the treatment of wastewater in a complex system such as high temperature.

The application provides a one-step forming graphite crucible and a preparation method and device thereof, and the graphite crucible comprises the following raw materials in parts by mass: 70-80 parts of artificial graphite powder, 10-15 parts of mesophase carbon microbeads, 10-15 parts of vermicular graphite powder, 20-25 parts of thermosetting phenolic resin, 1-2 parts of additives, 1-2 parts of a release agent, and 1-3 parts of benzidine; in the patent, the thermosetting phenolic resin is used as a binder; the thermosetting resin has certain fluidity under heating and pressurization, and a solidification reaction occurs, so that a secondary powder grinding process after mixing is omitted, and the product does not need to be impregnated for densification and strength improvement, powder mixing is more uniform, and the product after forming has better homogeneity.

The invention discloses a composite film based on organic charge transfer eutectic and a preparation method and application thereof.The composite film comprises a polymer matrix and the organic charge transfer eutectic dispersed in the polymer matrix, and the polymer is selected from one or more of polyvinylidene fluoride and copolymers thereof. The organic charge transfer eutectic comprises an electron donor molecule and an electron acceptor molecule, the electron donor molecule is a polycyclic or heterocyclic aromatic molecule or benzidine molecule with a pi conjugated structure, and the electron acceptor molecule is an organic conjugated small molecule with a quinone structure or an aromatic molecule containing a cyano group. The eutectic composite film based on organic charge transfer has excellent flexibility and dielectric property, and a flexible self-functional device prepared by using the eutectic composite film as a sensing layer has high output voltage and high stable sensitive response, and can be used in the fields of low-quality energy collection and wearable sensors.

The invention relates to the technical field of chemical engineering separation, and discloses a method for purifying a 3, 3 '-diaminobenzidine crude product and application, the method comprises the following steps: (1) mixing the 3, 3'-diaminobenzidine crude product with a good solvent for the first time to obtain a solution containing 3, 3 '-diaminobenzidine; wherein the good solvent comprises an organic matter containing a nitrogen element and / or an organic matter containing a sulfur element; (2) carrying out second mixing on a solution containing 3, 3 '-diaminobenzidine and a solventing-out agent; wherein the solventing-out agent comprises water and / or monohydric alcohol; and (3) aging the product obtained by the second mixing, then carrying out second solid-liquid separation on the product obtained by the aging, and washing and drying the solid obtained by the second solid-liquid separation. The method provided by the invention has the advantages of mild conditions, no need of nitrogen protection and low solvent consumption, and the 3, 3 '-diaminobenzidine product with high purity and high yield can be obtained only through one-step crystallization.

The invention provides a multifunctional nano material Ni-MoS2 (at) Au for detecting trace toxic substances in mushrooms and a preparation method of the multifunctional nano material Ni-MoS2 (at) Au. The nano material is prepared from a metal oxide, a surfactant, precious metal nano particles and a solvent, the nano material has colorimetric and Raman detection functions on various trace toxic substances (mercury ions and amanita peptide) in mushrooms, hydrogen peroxide is immediately catalyzed to quickly oxidize 3, 3 ', 5, 5'-tetramethyl benzidine into yellow 3, 3 ', 5, 5'-tetra (tetrafluoromethyl) phenyl diamine oxide after the nano material is in contact with a target object Hg < 2 + > for 1s in a colorimetric mode, the nano material has an extremely low detection limit of 0.036 mu g / mL, and the nano material can be used for detecting various trace toxic substances (mercury ions and amanita peptide) in mushrooms. The catalyst has good selectivity and is not interfered by other heavy metal ions; in a Raman mode, high-sensitivity detection of alpha-amanita peptide and beta-amanita peptide can be realized, and the detection limit ranges are 10 <-4 > M to 10 <-8 > M. The nano material provides a reference mode capable of detecting multiple target objects in the same system, and opens up a new way for a detection strategy of trace toxic substances in the field of food safety detection.

The invention belongs to the technical field of analytical chemistry, and relates to ferrous ion detection liquid as well as a detection method and application thereof. The technical problems that in the prior art, ferrous ions are detected by changing surface modifiers of silver nanoparticles, selectivity is insufficient, sensitivity is limited, steps are tedious, detection instruments are complex, and cost is high are solved. The invention provides a ferrous ion detection liquid which comprises tetramethyl benzidine, thiohydracrylic acid and silver nanoparticles, and the ratio of the tetramethyl benzidine to the thiohydracrylic acid to the silver nanoparticles is (1200-6000): (0.005-0.5): 99 according to the mass concentration. The pH value of the detection liquid is 4-6. The detection liquid is high in selectivity and high in sensitivity. The invention provides a preparation method of the ferrous ion detection liquid, and also provides a ferrous ion detection method, which is simple and convenient, is easy to detect, and can rapidly detect micromole-level metal ferrous ions. Meanwhile, the invention further provides application of the ferrous ion detection method in the sensing field and environment monitoring.