8results about How to "Increase surface charge density" patented technology

The invention relates to the technical field of friction power generation, and discloses a biodegradable triboelectric positive electrode material as well as a preparation method and application thereof. According to the preparation method, a Pickering emulsion mixing technology and a melt blending technology are combined, and a two-step composite process is adopted to optimize the micro-morphological structure of the polylactic acid / poly (butylene succinate) and carbon nanotube composite material. Compared with a composite material prepared by a traditional melt blending method, the triboelectricity output performance of the composite material is remarkably improved, and the charge density reaches up to 496.14 [mu] C / m < 2 > and is improved by about 1.43 times. The material not only enhances the triboelectric property, but also has excellent biodegradability and wide application prospects.

The invention discloses a mesoporous electro-adsorption defluorination positive electrode material rich in defects after vulcanization reconstruction, which is prepared by the following steps: preparing a bismuth-doped and defect-rich mesoporous carbon material, including ultrasonic vibration stirring, hydrothermal treatment in an organic environment, nitrogen atmosphere annealing and secondary hydrothermal treatment in which sulfur participates; the electro-adsorption positive electrode material belongs to a sulfur-modified bismuth-containing mesoporous synergistic platform embedded in a carbon shell, and has the defects of a nano frame with strong pore accessibility and high density; the synergistic process comprises double-electric-layer capacitive adsorption and reversible oxidation-reduction conversion. The nanometer configuration reduces the dependence on slow diffusion, reduces the activation energy barrier, and shows high redox activity. The electrode prepared by the method has a unique mesoporous framework, a large number of defluorination sites are obtained on the surface of the electrode, a rapid ion storage behavior mainly based on a capacitance control process is realized on a solid-liquid interface, fluorine-containing substances in water can be effectively separated in an electro-adsorption system, and the method is a pollution control process with a clear mechanism.

The present application discloses an organic modified ion sieve composite adsorbent material and its preparation method and application. The preparation method comprises the following steps: (1) dissolving a polymerization monomer and an initiator in a first organic solvent to obtain an oil phase, mixing and stirring with an ion sieve powder to obtain a prepolymer, and then adding the prepolymer into an aqueous phase for dispersion to obtain an ion sieve gel; (2) adding an initiator and a cross-linking agent to the ion sieve gel, and performing a suspension polymerization reaction to obtain a granular ion sieve; (3) dissolving the granular ion sieve in a second organic solvent, adding a Lewis acid catalyst and a negatively charged functional group, and washing the reaction product with a weak acid, washing with water, and drying to obtain a composite adsorbent material. The present application adopts a prepolymerization-swelling-cross-linking-organic modification method, and the composite adsorbent material obtained by step-by-step polymerization has good organic solvent tolerance; the introduction of negatively charged functional groups can increase the surface charge density of the adsorbent, and the pH sensitivity of the product is significantly reduced, and the adsorption amount is increased by more than 2 times compared with that before modification.

The invention discloses a fragrant pomelo peel essential oil compound preservative capable of improving the storage quality of prunus salicina, and belongs to the technical field of fruit preservation. The preservative is prepared from the following components in percentage by mass: 0.1 to 1.0 percent of fragrant pomelo peel essential oil, 0.5 to 2.0 percent of chitosan, 0.3 to 1.5 percent of modified white carbon black, 0.05 to 0.2 percent of antioxidant, 0.2 to 1.0 percent of glycerol, 0.1 to 0.5 percent of film-forming agent and the balance of deionized water. The modified white carbon black is prepared by step-by-step modification of a silane coupling agent, guar gum hydroxypropyl trimethyl ammonium chloride and sodium lignin sulfonate, can efficiently adsorb and slowly release essential oil, and enhances the compatibility with chitosan and the mechanical properties of a film layer. According to the preservative disclosed by the invention, a composite coating film is formed by dip-coating, so that water loss, browning and microbial decay after the prunus salicina is picked can be remarkably inhibited, the shelf life of the prunus salicina is prolonged to 12-15 days at normal temperature, and the preservative is suitable for large-scale storage and preservation of the prunus salicina.

This application provides surface-charged polymer nanoparticles, their synthesis method, and applications. The synthesis method for the charged polymer nanoparticles includes: adding a thiocarbonate chain transfer agent, a charged monomer, an aromatic monomer containing at least two benzene rings, and an initiator to a mixture of water and an organic solvent to obtain a mixture; heating the mixture in a vacuum-sealed environment, and obtaining surface-charged polymer nanoparticles through a polymerization reaction and self-assembly process, wherein the charged monomer is a monomer with a single charge type.

The invention discloses preparation of a low-density vermiculite-based nano zero-valence confinement iron-manganese composite complex and application of the low-density vermiculite-based nano zero-valence confinement iron-manganese composite complex in advanced treatment of novel pollutants. The preparation method comprises the following steps: firstly, mixing expanded vermiculite mineral powder, manganese-containing nano mineral powder and iron-containing nano mineral powder, vacuumizing and standing; and then reducing and roasting in a hydrogen atmosphere to obtain the vermiculite-based nano zero-valence confinement iron-manganese composite material. And finally, mixing the vermiculite-based nano zero-valent confinement iron-manganese composite material with a thiophene carboxylic acid ligand, vacuumizing and standing to obtain the low-density vermiculite-based nano zero-valent confinement iron-manganese composite complex. The low-density vermiculite-based nano zero-valent confinement iron-manganese composite complex is mixed with persulfate, so that active species mainly comprising sulfate free radicals, hydroxyl free radicals and singlet oxygen can be generated, and novel pollutants can be efficiently catalyzed and degraded.

The invention provides a self-powered building vibration sensing system based on a triboelectric nano-generator and a synaptic transistor. The self-powered building vibration sensing system comprises the triboelectric nano-generator, the organic field effect synaptic transistor and an LED lamp. The triboelectric nano-generator is of a sandwich structure and sequentially comprises a friction layer, an electrode and a packaging layer from top to bottom. The organic field effect synapse transistor is composed of a substrate with an insulating layer, an active layer and a top electrode from bottom to top. The LED lamp is connected with the source electrode and the drain electrode of the top electrode of the organic field effect synapse transistor; detecting a vibration signal generated by the building structure by using the triboelectric nano generator, and converting the vibration signal into an electric signal; a synapse transistor is used for processing the electric signal, simulating the function of a biological synapse, and processing and evaluating the vibration signal; the LED lamp generates a light signal when the output response of the synaptic device exceeds a preset threshold.

The invention provides a superfine fiber regenerated material with a charged gradient structure and a preparation method of the superfine fiber regenerated material, and relates to the technical field of non-woven fabric preparation. The preparation method of the superfine fiber regenerated material comprises the following steps: S1, preparing a cellulose stock solution; s2, forming the cellulose melt-blown non-woven fabric; and S3, recycling the NMMO solvent. The NMMO solution and other organic compound impurities which are not completely reacted can be separated through rectification and purification, and the purity of the NMMO is accurately improved, so that the NMMO reaches a higher quality standard; degradation products such as residual chains can be removed in a targeted manner through micellar enhanced ultrafiltration, so that the quality of NMMO is more stable; impurities such as residual chains, bacteria and metal ions are removed and degraded through rectification and purification, the chemical stability of the NMMO solution is enhanced, and the NMMO solution has better dissolving capacity and chemical stability.