48results about How to "Strong electrostatic interaction" patented technology

The invention relates to a preparation method of hydrogel with high self-repairing capacity and high electric conductivity. The method comprises steps as follows: (1) 4-vinylpyridine is dissolved in an acetone solution, and then 1,3-propane sultone is dissolved in acetone and slowly dropwise added to the acetone solution of 4-vinylpyridine at 0-30 DEG C under the protection of nitrogen; the mixture is subjected to a stirring reaction for 3-5 d after addition; after the complete reaction, filtration is performed, a filter cake is washed with acetone; 3-(4-vinyl-1-pyridine)allyl sulfonate is obtained after vacuum drying; (2) 3-(4-vinyl-1-pyridine)allylsulfonate, sodium p-styrenesulfonate and 2-acrylamide-2-methyl allyl sulfonate or acrylic acid are dissolved in water, then a crosslinking agent and a photoinitiator are added, polymerization is initiated under ultraviolet irradiation, and hydrogel is prepared. The polyion liquid gel shows excellent electrochemical performance, has ion electric conductivity as high as 1.53 Sm<-1> at the room temperature and has excellent mechanical properties, and the electrochemical performance can be kept stable under different deformation conditions.

A method of stabilizing electromagnetically charged particles, which includes coating electromagnetically charged particles with a protective layer; and etching the protective layer to produce a porous protective layer on the electromagnetically charged.

The invention discloses a Mo0.5W0.5S2 nanotile and graphene composite nanomaterial and a preparation method thereof. The Mo0.5W0.5S2 nanotile and graphene composite nanomaterial is formed by compounding a Mo0.5W0.5S2 nanotile with few layers and graphene, wherein the mass ratio of the Mo0.5W0.5S2 nanotile to graphene ranges from 1 to 1-1 to 4. The preparation method comprises the following steps of firstly, ultrasonically dispersing graphene oxide into deionized water; then, adding a gemini surfactant, and sufficiently stirring; next, sequentially adding L-cysteine, ammonium thiomolybdate and ammonium thiotungstate, and sufficiently stirring to dissolve L-cysteine, ammonium thiomolybdate and ammonium thiotungstate; and transferring the mixed dispersion system into a hydrothermal reaction kettle to carry out hydrothermal reaction at the temperature of 230-250 DEG C for 20-24h, then, naturally cooling to the room temperature, centrifuging to collect a solid product, sufficiently washing with deionized water, drying, and finally, carrying out heat treatment at a nitrogen and hydrogen mixed atmosphere to obtain the Mo0.5W0.5S2 nanotile and graphene composite nanomaterial. The method disclosed by the invention has the characteristics of simplicity and convenience; in addition, no organic solvent is needed to be consumed. The prepared composite nanomaterial is widely applied as a lithium ion battery electrode material and an electrocatalytic material.

The invention discloses a Mo0.5W0.5S2 nano-tile/graphene electrochemical sodium storage composite electrode and a preparation method thereof, wherein an electrochemical sodium storage active substance is a Mo0.5W0.5S2 nano-tile and graphene composite nanomaterial; the ratio of the amount of substance of Mo0.5W0.5S2 nano-tile to graphene in the composite nanomaterial is 1: 2; the Mo0.5W0.5S2 nano-tile has few layers and averagely has 3-5 layers; the composite electrode comprises the following components by weight percent: 80% of the Mo0.5W0.5S2 nano-tile/graphene composite nanomaterial, 10% of conductive acetylene black, 5% of carboxymethyl cellulose and 5% of polyvinylidene fluoride. The preparation method comprises the steps of firstly, preparing the Mo0.5W0.5S2 nano-tile/graphene composite nanomaterial, mixing the obtained composite nanomaterial with the acetylene black and the polyvinylidene fluoride to prepare paste, coating a copper foil with the paste, and rolling to obtain the electrochemical sodium storage composite electrode. The electrochemical sodium storage composite electrode has the high electrochemical sodium storage capacity.

The invention provides a heterostructure silicon-based negative electrode material, a preparation method thereof and a lithium ion battery. The negative electrode material comprises carbon nanotubes,silicon distributed on the surface of the carbon nanotubes, and graphene coated on the silicon. 1) mixing that carbon nanotube and the acid, condensing and reflux, and then solid-liquid separation toobtain the carbon oxide nanotube; 2) after that carbon oxide nanotube is dispersed in wat, mixing with an organosilicon source, heating and reacting, and then solid-liquid separation; 3) mixing the product and the magnesium powder, crushing the mixture in an inert atmosphere, heating the mixture in an inert atmosphere, and heat treating the mixture; 4) under vacuum or inert atmosphere, taking carbon source as raw material to produce graphene by chemical vapor deposition on that product of the step 5) pickling to obtain the negative electrode material. The negative electrode material provided by the invention has good cycle stability and rate performance.

The invention discloses a preparation method and application of a hydrophilic and antibacterial dual-modified ultrafiltration membrane, belonging to the technical field of ultrafiltration membranes. The invention aims to solve the problem that conventional ultrafiltration membrane materials are difficult to realize hydrophilic and antibacterial dual modification at the same time. The preparation method comprises the following steps: adding a condensing agent and 3-dimethylaminopropylamine into a graphene oxide suspension for a reaction, adding a cleaned reactant and long-chain halogenated alkane into an organic solvent, and carrying out a sufficient reaction at 20-80 DEG C for 8-24 hours to obtain a quaternized graphene oxide modifier; and 2, adding the quaternized graphene oxide modifierinto an organic solvent, carrying out ultrasonic dispersion to obtain a GO-Q suspension, dissolving a polymeric membrane matrix material and a membrane modifier into the GO-Q suspension to obtain a uniform membrane casting solution, and carrying out casting molding. The ultrafiltration membrane with the double functions of hydrophilicity and antibacterial performance is prepared by an immersion precipitation phase inversion method; and the modified ultrafiltration membrane shows better mechanical properties, water treatment performance, hydrophilicity and antibacterial performance.

The invention discloses an electrochemical sodium storage composite electrode with high capacity and cycle stability and a preparation method. The electrochemical sodium storage active substance is a MoS2 nano tile/graphene composite nano material; the substance amount ratio of the MoS2 nano tile to graphene in the composite nano material is (1 to 1)-(1 to 13); the MoS2 nano tile is of a few-layer layered structure, and the average layer number is 4; the composite electrode comprises the following components by weight percent: 80% of MoS2 nano tile/graphene composite nano material, 10% of acetylene black, 5% of carboxymethyl cellulose and 5% of polyvinylidene fluoride. The preparation method comprises the following steps: preparing a MoS2 nano tile/graphene composite nano material, and blending the MoS2 nano tile/graphene composite nano material with acetylene black and polyvinylidene fluoride to obtain a paste; smearing the paste on a copper foil serving as a current collector; and performing vacuum drying and rolling to obtain the electrochemical sodium storage composite electrode. The MoS2 nano tile/graphene electrochemical sodium storage composite electrode disclosed by the invention has high reversible sodium storage capacity and wide application prospect.

The invention discloses a WS2 nano tile/graphene electrochemical sodium storage composite electrode and a preparation method. The electrochemical sodium storage active substance is a WS2 nano tile/graphene composite nano material; the substance amount ratio of the WS2 nano tile to graphene in the composite material is (1 to 1)-(1 to 3); the WS2 nano tile has few layers, and the average layer number is 4; the composite electrode comprises the following components by weight percent: 80% of WS2 nano tile/graphene composite nano material, 10% of acetylene black, 5% of carboxymethyl cellulose and 50% of polyvinylidene fluoride. The preparation method comprises the following steps: preparing a WS2 nano tile/graphene composite nano material, and blending the WS2 nano tile/graphene composite nano material with acetylene black and polyvinylidene fluoride to obtain a paste; uniformly smearing the paste on a copper foil serving as a current collector; and performing vacuum drying and rolling to obtain the electrochemical sodium storage nano material composite electrode. The composite electrode disclosed by the invention has high reversible sodium storage capacity, excellent cycle performance and enhanced multiplying power characteristic.

The invention discloses a Mo0.5W0.5S2 nano tile/graphene electrochemical lithium storage composite electrode and a preparation method thereof. The preparation method comprises the steps as follows: graphene oxide is subjected to ultrasonic dispersion in deionized water; a dimeric surfactant is added firstly and then L-cysteine, ammonium thiomolybdate and ammonium thiotungstate are sequentially added with stirring; the obtained hybrid dispersion is transferred to a hydrothermal reaction kettle to have a hydrothermal reaction for 20-24 hours at the temperature of 230 DEG C and is naturally cooled, and solid products are collected centrifugally, washed by deionized water, dried and subjected to thermal treatment to prepare the Mo0.5W0.5S2 nano tile/graphene composite nano material; and then the Mo0.5W0.5S2 nano tile/graphene composite nano material, acetylene black and polyvinylidene fluoride are prepared into slurry, copper foil is coated with the slurry, and the electrode is obtained through rolling. The prepared Mo0.5W0.5S2 nano tile/graphene electrochemical lithium storage composite electrode has high electrochemical lithium storage capacity, excellent cycle performance and enhanced magnification characteristic, thereby having wide application prospect.

The present invention provides a pigment disperse combination, a coloring photosensitive combination, a color filter, a liquid crystal display element and a solid camera shooting element; the pigmentdisperse combination is capable of dispersing minute pigment in a manner of one particle, has an excellent disperse stability and may be formed coloring tunica with an excellent contrast grade; the coloring photosensitive combination contains the pigment disperse combination, has an excellent curing sensitivity, and may be formed high strength coloring curing membrane with an excellent contrast grade. The pigment disperse combination of the invention is characterized in that the pigment disperse combination contains (a) a high molecular compound, (b) a pigment and (c) an organic solvent, the high molecular compound contains at least one repetitive unit of repetitive units represented by formula (I) and formula (II), in the formula (I) and (II), R<1>-R<6> represent hydrogen atom and the like, X<1> and X<2> represent -CO- and the like, L<1> and L<2> represent two-valency organic linking groups and the like, Y<1> represents an oxygen atom and the like, Y<2> represents -C(=O)O- and the like, Z<1> and Z<2> represent groups containing a C-C double bond, m and n represent integers from 2 to 8, and p and q represent integers from 1 to 100.

The invention discloses a WS2 nanotile and graphene composite nanomaterial and a preparation method thereof. The composite nanomaterial is formed by compounding graphene and a WS2 nanotile with few layers and graphene, wherein the WS2 nanotile has 2-6 layers and averagely has 3-5 layers, and the mass ratio of the WS2 nanotile to the graphene ranges from 1 to 1-1 to 4. The preparation method comprises the following steps of firstly, ultrasonically dispersing graphene oxide into deionized water; then, adding a gemini surfactant, and sufficiently stirring; next, sequentially adding L-cysteine and ammonium thiotungstate, and sufficiently stirring to dissolve L-cysteine and ammonium thiotungstate; and transferring the mixed dispersion system into a hydrothermal reaction kettle to carry out hydrothermal reaction at the temperature of 230-250 DEG C for 20-24h, then, naturally cooling to the room temperature, centrifuging to collect a solid product, sufficiently washing with deionized water, drying, and finally, carrying out heat treatment to obtain the WS2 nanotile and graphene composite nanomaterial. The method disclosed by the invention is simple, convenient and free of consuming organic solvents.

The invention provides a starch-based capsule coat, which is prepared from the following raw materials in percentage by mass: 40-70wt% of anionic/cationic starch, 20-50wt% of a natural product, less than or equal to 10wt% of a plasticizer and the balance of water; the charge of the natural product is opposite to that of the anionic/cationic starch; the natural product comprises at least one of chitosan, carboxymethyl cellulose, sodium alginate, polylysine, dextran, dextran sodium sulfate and sulfonated cellulose. According to the invention, the anionic/cationic starch with charges and the natural product with opposite charges are compounded, the polyelectrolyte material can be formed under the electrostatic interaction, the acting force of the electrostatic interaction of the polyelectrolyte material is far stronger than that of hydrogen bonds and intermolecular interaction, and the polyelectrolyte material has an aggregation effect, so that the starch-based capsule coat has excellent mechanical properties.

The invention discloses a WS2 nano-tile/graphene electrochemical magnesium storage composite electrode and a preparation method thereof, wherein an electrochemical magnesium storage active substance is a WS2 nano-tile and graphene composite nanomaterial; the ratio of the amount of substance of WS2 nano-tile to the graphene in the composite nanomaterial is (1: 1)-(1: 3); the WS2 nano-tile has few layers and averagely has 4 layers; the composite electrode comprises the following components by weight percent: 80% of the WS2 nano-tile/graphene composite nanomaterial, 10% of acetylene black, 5% of carboxymethyl cellulose and 5% of polyvinylidene fluoride. The preparation method comprises the steps of firstly, preparing the WS2 nano-tile/graphene composite nanomaterial, mixing the obtained composite nanomaterial with the acetylene black and the polyvinylidene fluoride to prepare paste, evenly coating foamy copper taken as a current collector with the paste, carrying out vacuum drying, and rolling to obtain the electrochemical magnesium storage composite electrode. The electrochemical magnesium storage composite electrode has the high reversible magnesium storage capacity, excellent cycle performance and improved multiplying power, and is wide in application prospect.

The invention discloses a WS2 hole nano sheet/graphene electrochemical magnesium storage composite electrode and a preparation method thereof. The electrochemical magnesium storage active substance is a WS2 hole nano sheet/graphene composite nano material; the substance amount ratio of the WS2 hole nano sheet to graphene in the composite nano material is (1 to 1)-(1 to 3); the WS2 hole nano sheet has few layers; the composite electrode comprises the following components by weight percent: 80% of WS2 hole nano sheet/graphene composite nano material, 10% of acetylene black, 5% of carboxymethyl cellulose and 5% of polyvinylidene fluoride. The preparation method comprises the following steps: preparing a WS2 hole nano sheet/graphene composite nano material; blending the prepared composite nano material with the acetylene black, carboxymethyl cellulose and polyvinylidene fluoride to obtain slurry; smearing the slurry on a current collector; and drying and rolling to obtain the WS2 hole nano sheet/graphene electrochemical magnesium storage composite electrode. The composite nano material electrochemical magnesium storage composite electrode disclosed by the invention has high reversible magnesium storage capacity and wide application prospect.

The invention belongs to the field of biological, and particularly relates to a method for detecting trypsinase activity. A simple and convenient method for detecting the trypsinase activity is builtby using the mutual action differences of polypeptides before and after the trypsinase enzyme digestion and graphene oxide loaded with electrochemical active molecule thionine. The graphene oxide haslarger specific surface area, and can load a great amount of thionine; the effects of amplifying electrochemical signals and improving the detection sensitivity are achieved. The gold electrode surface is modified by gold sulfhydryl bond covalent formed by gold and sulfhydryl of tail end cysteine via substrate polypeptides; the sulfhydryl-containing polypeptides are subjected to covalent modification onto the gold surface; then, 6-mercapto-l-hexanol is used for space occupation; non-specific adsorption polypeptides are removed; the electrode surface blank position is sealed; the N tail end ofthe substrate polypeptide sequence is provided with histidine; the histidine has positive charges; graphene oxide containing rich carboxyls have negative charges after dissociation; stronger static electricity mutual action exists between the histidine and the graphene oxide, so that a prepared compound is adsorbed to the final modified electrode product.

The invention discloses a solid electrolyte and a preparation method thereof, and a lithium ion battery and a preparation method thereof. The preparation method of the solid electrolyte comprises the following steps: uniformly mixing a lithium salt, a halogen initiator and an oxygen-containing cyclic ether monomer to obtain a precursor liquid, and initiating in-situ polymerization of the oxygen-containing cyclic ether monomer through the halogen initiator to obtain the high-migration-number polymer solid electrolyte. The solid electrolyte provided by the invention has high ionic conductivity, high transference number and good interface contact with a positive electrode and a negative electrode at room temperature, can effectively enable lithium ion concentration distribution and electric field distribution on the surface of lithium metal to be more uniform, inhibits growth of lithium dendrites, effectively reduces interface impedance between the solid electrolyte and the electrode, and improves the service life of the solid electrolyte. The electrolyte shows excellent stability to a lithium metal negative electrode, so that a solid-state battery containing the electrolyte shows good electrochemical performance.

The present invention relates to the technical field of lithium battery diaphragms, and in particular, to a composite diaphragm for high-infiltration lithium batteries. The invention, in view of the poor electrolyte absorption and liquid holding capacity of a lithium ion battery diaphragm, provides a high-infiltration lithium ion battery diaphragm. The outermost layer of the diaphragm is a polypropylene microporous membrane and the intermediate layer of the diaphragm is a polyethylene composite microporous membrane. Both sides of the polyethylene composite microporous membrane are coated withthe same functional coating. The functional coating is composed of maleic anhydride grafted hydroxypropyl-[beta]-cyclodextrin, nano-silica, an binder and ethyl alcohol. The technical scheme provided by the invention is simple in process and friendly to environment. The prepared composite diaphragm has good electrolyte absorption and electrolyte holding performance, air permeability and thermal stability.

The invention provides a preparation method for an alginic acid-dopamine/nano-hydroxyapatite composite bracket. The method comprises the following steps: utilizing (3-chlorine-2-hydroxypropyl) trimethyl ammonium chloride (CHPTAC) to perform quaternization modification on chitosan (CS), thereby acquiring quaternized chitosan (QCS); utilizing QCS as an organic matter to in-situ compound hydroxyapatite, thereby preparing the quaternized chitosan/hydroxyapatite (QCHA) with excellent dispersity; compounding with the dopamine modified alginic acid (Alg-DA) prepared in advance under the effect of electrostatic interaction, thereby acquiring an alginic acid-dopamine/nano-hydroxyapatite (Alg-DA/QCHA) composite bracket material. The structure and performance of the Alg-DA/QCHA composite bracket are regulated in the manner of changing the ratio of Alg-DA to QCHA; the calcium chloride is utilized to crosslink the composite bracket, so that the porosity of the bracket can be adjusted; the Alg-DA/QCHA composite bracket material prepared according to the invention has excellent mechanical property and mineralizing property, suitable degradation period, excellent cytocompatibility and cell adhesion property and wide application prospect in the field of biomedical engineering.