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32 results about "Surface charge" patented technology

Surface charge is the electrical potential difference between the inner and outer surface of the dispersed phase in a colloid. There are many different processes which can lead to a surface being charged, including adsorption of ions, protonation/deprotonation, and the application of an external electric field. Surface charge causes a particle to emit an electric field, which causes particle repulsion and attraction, affecting many colloidal properties.

Polyaluminum chloride-based flocculant as well as preparation method and application thereof

The invention discloses a polyaluminum chloride-based flocculant as well as a preparation method and application thereof, belongs to the technical field of preparation of flocculants, and aims at solving the technical problem that the flocculation performance and the stability of a flocculant in the prior art need to be further improved. The surface charges of iron-based particles are adjusted through sodium citrate, so that the problem of particle agglomeration is effectively avoided, the coating uniformity of microgel is improved, and the specific surface area of the material is increased; abundant cation sites are introduced into the trimethylamine modified chitosan, so that the electrostatic adsorption capacity of the microgel on anion pollutants is remarkably enhanced, and meanwhile, the electrical property and the stability of a system are improved; the addition of sodium metasilicate further promotes the modified PAC to form a stable Al-O-Si bridging structure, the material is endowed with good three-dimensional skeleton strength and composite interface stability, the three components cooperate with each other and play key roles in particle dispersity, charge construction and skeleton stability, and finally, an efficient, stable and storable composite flocculation system is constructed.
Owner:JIANGSU LANYAO WATER PURIFYING AGENT CO LTD

Preparation method of a colloidal crystal capillary column based on electric field controllable assembly and application thereof

The present application relates to a controllable preparation method of a colloidal crystal capillary column and its application in biomolecule separation, and specifically comprises the following steps: a plunger and an electroosmotic pump are prepared in situ at one end of a capillary; a buffer solution containing monodisperse colloidal particles is filled in an upper reservoir of an electric field assembly device, and a buffer solution is filled in a lower reservoir; the capillary is filled with the buffer solution, and the end of the capillary containing the electroosmotic pump is inserted into the lower reservoir; the dispersion of the colloidal solution is maintained by applying oscillation to the upper reservoir, an electric field is applied between the two reservoirs to make the colloidal particles move to the electroosmotic pump under the action of an electroosmotic flow, and a three-dimensional colloidal crystal is assembled; and the capillary is supplemented with an ultrasonic force to reduce lattice defects. The present application has the advantages of simple preparation process, controlled directional movement of colloidal particles through an electric field, improved assembly efficiency and quality of the three-dimensional colloidal crystal, and controllable assembly of the colloidal particles under the action of an electric field through regulation and control of the length and surface charge of the electroosmotic pump.
Owner:DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES

Preparation method of low-self-discharge aminated activated carbon for supercapacitor

The invention discloses a preparation method of low-self-discharge aminated activated carbon for a supercapacitor, and belongs to the technical field of supercapacitors. The preparation method comprises the following steps: by taking commercial activated carbon as a raw material, sequentially adding a catalyst, the activated carbon and an amino reagent into a beaker according to a certain proportion, uniformly mixing, and then putting a uniform mixed solution into a reaction kettle for homogeneous reaction; and after the reaction is completed, washing with deionized water and absolute ethyl alcohol, and drying to obtain the aminated activated carbon. In the system, the introduction of the catalyst induces a cross-coupling reaction, so that the occurrence of side reaction is effectively avoided, and the directional introduction of amino functional groups on the surface of the activated carbon is promoted. The surface charge state is optimized through activated carbon surface amination, the adsorption capacity of activated carbon to charged ions is improved, then self-discharge caused by diffusion-controlled non-Faraday reaction is effectively restrained, when the initial voltage is 3.0 V, after standing is conducted for 40 hours, the voltage retention rate is larger than 76%, and low self-discharge of the supercapacitor is achieved.
Owner:INST OF COAL CHEM CHINESE ACAD OF SCI

Evaluation method suitable for electrostatic repulsion pressure among soil particles under field condition

The invention relates to the field of measurement of mixed electrolyte systems, in particular to a method for evaluating electrostatic repulsion pressure among soil particles under field conditions. Comprising the following steps: (1) measuring the specific surface area of soil particles; (2) measuring the number of surface charges of the soil particles under different pH conditions; (3) evaluating the surface charge density of the soil particles under different pH conditions; (4) evaluating the surface potential of the soil particles under the field condition; and (5) evaluating the electrostatic repulsion pressure among soil particles under the field condition. According to the method, calculation of the electrostatic repulsion pressure between soil particles under the actual field condition is achieved.
Owner:SOUTHWEST UNIV +1

Insulator surface charge cleaning method based on plasma discharge

According to the insulator surface charge cleaning method based on plasma discharge provided by the invention, the surface charge of the insulator can be actively, quickly and safely neutralized and cleaned through a composite discharge mode of pulse + direct current bias under the condition that equipment is not disassembled; the method comprises the following steps; equipment connection; setting and generating parameters of a composite waveform; high-voltage amplification; the plasma discharges to sweep charges; the discharge plasma device generates a high-pulse voltage electric field to reach gas breakdown field strength, a violent ionization reaction occurs, a large number of charged particles are further generated, and when superposed voltage acts during a pulse interval, the charged particles generated during the pulse interval migrate to the surface of the insulator under the action of the electric field generated during the pulse interval, so that the charged particles are formed. When residual charges in the discharge space are swept, migrated charges are used for neutralizing charges on the surface of the insulator, so that the charges on the surface of the insulator are swept; and cleaning is finished.
Owner:ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER CO LTD

Methods to remediate soil contaminated with poly- and / or perfluoro alkyl substances (PFAS), and / or other anionic organic contaminants

A method to remediate soil contaminated with anionic organic contaminants by electrostatically immobilizing the anionic organic contaminants, including: adding a soluble aluminum salt solution onto or into the soil; and adding an alkaline solution onto or into the soil to precipitate aluminum hydroxide solids having a formula of roughly Al(OH) 3 in-situ, and adjust the pH of the soil to a level that balances insolubility against positive electrostatic surface charge.
Owner:GOVERNMENT OF THE UNITED STATES AS REPRESENTED BY THE ADMINISTRATOR OF THE U S

Acid-resistant core-shell nanocomplex for oral use and mrcp t2-negative contrast using same

PCT designated stageWO2026095717A1Dispersion deliveryMedical automated diagnosisNegative Contrast AgentPolymer science
The present invention relates to an orally administrable complex having an average hydrated particle diameter of 10 nm to 100 nm and comprising: a core composed of metal or metal oxide-based nanoparticle(s); and a shell disposed as an acid-resistant barrier layer on the surface of the core and coated with polysaccharide crosslinked colloidal particles which form multi-point coordination bonds with metal ions on the surface of the core and have an average hydrated particle diameter of 2 nm to 8 nm and a surface charge of -20 mV to 0 mV. The polysaccharide crosslinked colloidal particles are characterized in that, in an aqueous solvent, (i) an -OH functional group of a monosaccharide, which is a building block of a linear polysaccharide, a branched polysaccharide, or a cyclic polysaccharide, is modified using a first crosslinking agent having an epoxide group, and (a) the functional group modified by the first crosslinking agent and a spatially adjacent -OH functional group are directly crosslinked and / or (b) two spatially adjacent functional groups modified by the first crosslinking agent are crosslinked intramolecularly and / or intermolecularly via a second crosslinking agent having two or more amine groups (-NH2) to form polysaccharide crosslinked particles, and (ii) the number of crosslinking agent-derived basic amine groups exposed on the surface is modified with a -COOH functional group so that the surface charge of the polysaccharide crosslinked colloidal particles is in the range of -20 mV to 0 mV. The orally administrable complex according to the present invention is a T2 MRI contrast agent that can be used as an active ingredient of a composition for diagnostic biliary and pancreatic imaging.
Owner:INVENTERA INC

A method of calculating a theoretical polarization curve of an inhibitor on a metal surface

The application provides a method for calculating a theoretical polarization curve of an inhibitor on a metal surface, obtaining a pure Fe (110) surface from an iron body phase, constructing a 4*3*1 Fe (110) surface and performing structural optimization to obtain a stable Fe (110) surface; placing an inhibitor molecule on a top position of the Fe (110) surface in sequence and performing structural optimization to obtain a stable adsorption structure; adding a water molecule layer on the inhibitor molecule and performing structural optimization to obtain a stable co-adsorption system; calculating a planar average electron potential energy of the co-adsorption system to obtain an electrode potential of the system and surface charge information of the co-adsorption system; taking the co-adsorption system as a cathode and an anode, simulating anode electron loss and cathode electron gain processes in a corrosion process, calculating electrode potentials of the system in different charge states, linearly fitting the obtained electrode potentials, and obtaining a theoretical polarization curve. The application can preferably give polarization curves of various inhibitors on different metal surfaces.
Owner:NANJING UNIV OF SCI & TECH

Preparation method of light-driven nano plant flower transmission powder

The invention relates to a preparation method of light-driven nano plant flower-transmission powder. The preparation method comprises the following steps: mixing a chitosan solution with a PLGA solution, adding a stabilizer, performing ultrasonic emulsification, adding a cross-linking agent, performing constant-temperature dispersion, performing centrifugal washing, and performing freeze drying to obtain porous chitosan-PLGA particles; dispersing the porous chitosan-PLGA particles in PBS (Phosphate Buffer Solution), adding sulfhydrylated SLG, oscillating and dialyzing to obtain functional particles of which the surfaces are grafted with targeting groups; mixing the porous chitosan-PLGA particles with the dried pollen, and oscillating in a vacuum adsorption device; and adding a photo-thermal response material dispersion liquid, continuing vacuum adsorption, and packaging a PLGA shell layer. Light energy is absorbed by the photo-thermal response material and then converted into heat energy, thermophoresis of a surrounding medium is triggered, the nano-particle material is pushed to move directionally, namely surface charges are generated under illumination, controllable movement is achieved through an external electric field or a self potential difference, and the photo-thermal response material can respond to the surface of the nano-particle material according to the local illumination intensity difference. And the nano-particle material is guided to move along the light intensity gradient, so that targeted pollination is realized.
Owner:BEIJING FAIRVIEW NEW TECH CO LTD

Primary charged particle beam aberration for multi-beam scanning charged particle microscope based on measurements on secondary charged particle beams

PCT designated stageWO2025233473A1Electric discharge tubesParticle beamBeam scanning
Techniques are disclosed to determine at least one aberration of the multiple primary charged particle beams (3.1, 3.2, 3.3) of a multi-beam scanning charged particle microscope, e.g., a deflection or a spot distortion of the multiple primary charged particle beams. The at least one aberration is determined based on an estimation of a charge buildup (1050) of the sample (7), i.e., a local surface charge of a sample surface. A prediction of the charge buildup may be determined for a future point in time.
Owner:CARL ZEISS MULTISEM GMBH

Nanofluid capable of stably dispersing molten salt or salt solution and preparation method of nanofluid

The invention discloses a stably dispersed molten salt or salt solution nanofluid and a preparation method thereof. The nanofluid comprises a dispersion system and an additive, the dispersion system is a molten salt or a salt solution and is an inorganic salt composed of cations and acid radical ions, the additive at least comprises one or more compounds with a general formula I or salts thereof, and the additive further comprises a functional nanomaterial. According to the invention, a dopa compound is used as a precursor and is added after molten salt is melted or dissolved, and spontaneous oxidation and self-assembly of the dopa compound are accelerated by using cations in the molten salt to form polymer particles. Salt cations are complexed with functional groups with negative electricity on the surfaces of the particles and adsorb anions to form a thick double-electrode layer, so that the surface charge density and zeta potential are remarkably improved, agglomeration and sedimentation are inhibited, and stable dispersion is realized.
Owner:SHANGHAI JIAOTONG UNIV

A Plasma Dynamics-Based Method for Predicting the Lower Surface Flashover Voltage of Perfluoroisobutyronitrile Mixed Gases

This invention provides a method for predicting surface flashover voltage in a perfluoroisobutyronitrile (PFOS) mixed gas based on plasma dynamics. It comprehensively considers the effects of gas molecule desorption and collisional ionization, surface charge accumulation at the gas-solid interface, and carrier traps in the solid medium on the solid side. A surface flashover model is constructed, and by solving the continuity governing equations, Poisson's equation, and local field approximation equations for charged particles, the spatiotemporal distribution of the electric field intensity and the transport of charged particles in space are obtained, serving as a means to predict the surface flashover voltage. This invention not only predicts surface flashover voltage but also holds promise as a data reference for the development of environmentally friendly insulating gas equipment, saving experimental costs and improving R&D efficiency.
Owner:HUNAN UNIV

Hollow fiber membrane based on surface charge adsorption of antiviral material and preparation method of hollow fiber membrane

The invention belongs to the technical field of separation membrane materials, and particularly relates to a hollow fiber membrane based on surface charge adsorption of an antiviral material and a preparation method thereof.The preparation method comprises the following steps that S1, a hollow fiber membrane base material and the antiviral material are dried and then smashed to preset mesh numbers; s2, putting the crushed hollow fiber membrane base material particles, an antiviral material and a binder into a stirring kettle, and stirring and mixing at a preset temperature to obtain a homogeneous composite material; and S3, adding the homogeneous composite material obtained in the S2, a pore-foaming agent and a solvent into a reaction kettle, spinning and extruding, and putting into a coagulating bath to obtain the hollow fiber membrane loaded with the antiviral material. The antiviral material functional layer is introduced to the surface of the membrane, and positively charged virus particles in water are captured through electrostatic adsorption by utilizing positive charges carried by surface hydroxyl of the antiviral material functional layer in a water environment, so that the virus rejection rate is increased, and the limitation that a traditional microfiltration / ultrafiltration membrane depends on physical aperture screening is broken through.
Owner:HANGZHOU AOKE FILTRATION TECH CO LTD +1

Selective deposition using differential surface charging

A method includes extracting electrons from a remote electron source to negatively charge upper surfaces of a patterned layer with the electrons, and extracting positive ions from a remote ion source to selectively deposit a material on the upper surfaces by attracting the positive ions to the electrons of the upper surfaces. The upper surfaces may be negatively charged by concurrently applying a positive bias at the patterned layer and applying source power with a lower power level to generate plasma. The material may be selectively deposited by concurrently applying a negative bias at the patterned layer and applying source power with a higher power level to plasma. An extraction grid may separate the patterned layer from the plasma. The extraction grid may be electrically floating or coupled to a ground potential during either of the electron extraction step or the ion extraction step.
Owner:TOKYO ELECTRON LTD

CuS / diatomite composite adsorbent, and preparation method and application thereof

ActiveCN116651391BOther chemical processesWater contaminantsCationic polyelectrolytesNanoparticle
The application provides a CuS / diatomite composite adsorbent and a preparation method and application thereof, and belongs to the technical field of adsorbent preparation. First, a strong cation polyelectrolyte is used to pre-modify the surface charge of diatomite, and then a layer of CuS nanosheet with S 2‑ active groups is in-situ grown on the surface of the modified diatomite through a low-temperature water bath reaction to obtain a CuS / diatomite composite adsorbent. The adsorbent preparation method is simple, the conditions are mild, the raw material cost is low, the CuS nanoparticles are uniformly loaded on the surface of the diatomite, the prepared CuS / diatomite composite adsorbent well retains the macroporous structure of the diatomite, and the adsorption capacity of the adsorbent for heavy metal silver ions is significantly improved.
Owner:LUOYANG NORMAL UNIV

A method for characterizing surface charge of inorganic salts based on electrochemical means

The application belongs to the technical field of inorganic salt surface charge characterization, and relates to a method for characterizing the surface charge of inorganic salt based on an electrochemical method. In the method, the inorganic salt is processed into an electrode sheet, a saturated solution of the inorganic salt is used as an electrolyte, and the zero charge potential of the inorganic salt in the saturated solution is measured. The method does not need to grind the inorganic salt, guarantees the integrity of the crystal surface of the inorganic salt, and can accurately characterize the charge condition of the surface of the inorganic salt in the saturated solution.
Owner:TIANJIN UNIV OF SCI & TECH

Targeted delivery of biomimetic nanodrugs and preparation process thereof

PendingCN122321168AImmune clearanceArginine
This invention belongs to the field of biomedical technology and discloses a targeted delivery biomimetic nanomedicine and its preparation process. The system includes a polylactic acid-glycolic acid copolymer drug-carrying core, a biomimetic cell membrane coating layer, and a pH-responsive polyethylene glycol-arginine block copolymer embedded therein. The latter is anchored to the outer leaflet by a hexadecyl group, maintaining a weakly negative surface charge at physiological pH to evade immune clearance. In the weakly acidic tumor microenvironment, it triggers arginine guanidine matrix protonation, converting the surface potential to a positive charge and enhancing electrostatic adsorption with tumor cells. The core of this invention lies in constructing a dynamic charge interface with spatiotemporal resolution. This interface achieves sequential activation of immune escape and cell adsorption functions at the system level, rather than a simple superposition. This technical approach not only improves the drug accumulation efficiency at the tumor site but also provides a universal platform for other nanomedical applications requiring microenvironment-responsive surface regulation.
Owner:XINYANG VOCATIONAL & TECHN COLLEGE +1

Condensable particulate matter removal method and device with acoustic agglomeration and charge retention coupled

The invention belongs to the field of pollution control and deep purification of flue gas, and particularly discloses a sound wave agglomeration and charge maintenance coupled condensable particulate matter removal method and device, the method comprises the following steps: forcibly inducing CPM components in high-humidity flue gas to generate high-speed collision and agglomeration by using a sound field, so that CPM rapidly forms coagulated particles, and the coagulated particles are separated from the high-humidity flue gas; then charge compensation is carried out on the coagulation particles under the high-humidity flue gas condition, so that rapid attenuation of charges on the surfaces of the particles is inhibited, it is ensured that the coagulation particles keep effective migration rate in a follow-up trapping electric field, and finally the coagulation particles with stable charges are trapped and removed through the trapping electric field. According to the removal method, a sound field is used for promoting coagulation and growth of gaseous precursors such as acid mist cores, superfine liquid drops, suspended inorganic salt and SO3 / NH3, and coagulation particles are ensured to rapidly migrate, attach and settle in an external electric field through charge retention, so that efficient removal of the superfine CPM is realized; and the regeneration and re-release risk of the CPM caused by liquid drop entrainment, interface nucleation and airflow disturbance under the high-humidity or local supersaturation condition is avoided.
Owner:HUAZHONG UNIV OF SCI & TECH

Preparation method of hydroxyapatite and application thereof in fluorine removal of mine water

The application relates to the field of fluorine pollution treatment, in particular to a preparation method of hydroxyapatite and application of the hydroxyapatite in fluorine removal of mine water, and solves the problem that the adsorption effect of the existing fluorine removal agent is still poor, thereby limiting the wide application of the fluorine removal agent in fluorine wastewater. In the preparation process of the fluorine removal agent, the hydroxyapatite is loaded on lanthanum-doped porous nanofibers, the adsorption active sites on the surface of the hydroxyapatite are increased through the electrostatic attraction or ion exchange of metal ions or metal oxides on the electrically negative pollutants, the adsorption effect on fluorine ions is improved, the cetyltrimethylammonium bromide changes the surface charge by embedding into the hydroxyapatite crystal lattice, the surface of the hydroxyapatite shows positive charge, the electrostatic action between the hydroxyapatite and F ‑ is strengthened, a large number of amino functional groups are contained on the chitosan, the fluorine ions can be reacted with the fluorine ions, the fluorine ions in water can be adsorbed on the surface through adsorption, and the fluorine removal purpose is achieved.
Owner:HUAIBEI MINING CO LTD +2

Method and apparatus for enhanced separation and removal of contaminants and irradiated particulates from fluids

A method and apparatus for separation of radioactive particulates from liquids by filtration to remove or recover the particulates, that reduces the surfaces forces associated with electrostatic attraction between the particles and the filter medium by modifying or coating the surface of the filter medium with a material that exhibits a surface charge closer to or the same as that of the particulates in a given aqueous liquid. The method and apparatus can be used to filter radioactive particulates and contaminants from aqueous liquid or liquid process streams with a radiation resistant filter medium. The filters can exhibit a surface charge different from that of the particulates targeted for separation by mechanical filtration. The filtration medium can be modified to increase its resistance to erosion to permit use of more powerful backwashing regeneration methods and prevent attachment of the particulates to the filtration medium by coating the medium with a hydrophobic layer.
Owner:VRD LLC

Self-assembled carbon dioxide removal structure and method of manufacturing the same

PendingCN122438731ASorbentSurface charge
The present invention relates to a self-assembled carbon dioxide removal structure, in particular a carbon dioxide removal structure useful for direct air carbon capture (DAC), and methods of its manufacture and regeneration. The carbon dioxide removal structure comprises a support having at least one attachment surface with a negative triboelectric surface charge density of less than -150 µC m ‑2 ; and a plurality of amine-containing sorbent particles capable of adsorbing or binding carbon dioxide and self-assembling on the support.
Owner:NEG8 CARDBOARD CO LTD

Electrostatic spray filling metallization method and device for group hole vertical interconnection

The invention belongs to the field of micro-nano manufacturing, and discloses an electrostatic spray filling metallization method and device for group hole vertical interconnection. The method comprises the following steps: (1) carrying out modification treatment on the inner wall surface of a micropore in a substrate by adopting plasma; and (2) electrostatic spraying is carried out on the micropores in the upper area and the lower area of the substrate, along with accumulation of charges on the outer surfaces of the micropores, the electric potential of the outer surfaces of the micropores is higher than that in the micropores, meanwhile, electric field lines are focused into the micropores, then particles generated by electrostatic spraying are deposited into the micropores, and metal conductive layers are formed on the inner walls of the micropores. According to the invention, the electrofluid spray surface is used for depositing charged particles before and after the electrofluid spray surface is deposited, and the electrofluid spray surface is used for depositing charged particles, so that a non-uniform self-focusing electric field is constructed through droplet charge accumulation to realize rapid metallization of the micropores.
Owner:HUAZHONG UNIV OF SCI & TECH

A polyaluminum chloride-based flocculant, its preparation method and application

This invention discloses a polyaluminum chloride (PAC)-based flocculant, its preparation method, and its application, belonging to the field of flocculant preparation technology. It addresses the technical problem that the flocculation performance and stability of existing flocculants need further improvement. The method involves adjusting the surface charge of iron-based particles using sodium citrate, effectively avoiding particle aggregation and improving the uniformity of microgel coating and the specific surface area of ​​the material. Trimethylamine-modified chitosan introduces abundant cationic sites, significantly enhancing the electrostatic adsorption capacity of the microgel for anionic pollutants, while simultaneously improving the system's electrical properties and stability. The addition of sodium metasilicate further promotes the formation of a stable Al-O-Si bridging structure in the modified PAC, endowing the material with good three-dimensional skeleton strength and composite interface stability. These three elements synergistically play key roles in particle dispersibility, charge construction, and skeleton stability, respectively, ultimately constructing a highly efficient, stable, and storable composite flocculation system.
Owner:JIANGSU LANYAO WATER PURIFYING AGENT CO LTD

Tunnel construction air treatment method and system

The invention belongs to the technical field of tunnel construction environment control, and particularly relates to a tunnel construction air treatment method and system. The problems that high-concentration hydrophobic dust and harmful gas cannot be efficiently and synergistically removed, and intelligent dynamic regulation and control are lacked are solved, and the method comprises the steps that an atomization unit is arranged in a tunnel pollution source area, and an electric field purification unit is arranged at the downstream of airflow; the concentration and components of pollutants are monitored in real time through a sensor network; an agent is added into the atomization unit according to the monitoring data, so that the agent acts on dust particles after being atomized, and the surface charge characteristics of the dust particles are changed to enhance the hydrophilicity; air flow containing pollutants is conveyed to the electric field purification unit through the air flow guiding device; in the electric field purification unit, particulate matters and gaseous pollutants are synchronously removed by utilizing a high-voltage electric field; based on the pollutant component characteristics, the types of the used agents are dynamically switched.
Owner:CHINA RAILWAY 12TH BUREAU GRP CO LTD +1

Preparation method of electrophoresis white particles based on atomic layer deposition and product thereof

The invention provides a preparation method of electrophoresis white particles based on atomic layer deposition, which comprises the following steps: carrying out corrosive pretreatment on hollow glass microspheres in an alkaline solution to obtain a microsphere template; putting the microsphere template into a reactor, and sequentially and alternately introducing a titanium-based precursor and an oxygen-based precursor into the reactor under the purging of inert gas by utilizing an ALD (Atomic Layer Deposition) process, so as to obtain a titanium dioxide coated microsphere; and adding the titanium dioxide coated microspheres into a deionized water solution containing a surfactant for ultrasonic dispersion, and filtering and drying to obtain the electrophoresis white particles. High uniformity of particle size distribution, coating layer thickness and surface charge distribution is realized, uniform stress and consistent migration speed of particles in an electric field are ensured, the problems of smear, uneven brightness and the like in display application are effectively avoided, meanwhile, the stability of electrophoretic particles in the storage and use process is remarkably improved, and the display effect is improved. And the consistency and reliability of the product performance are ensured.
Owner:JIANGHAN UNIVERSITY

Nickel hydroxide and bismuth ferrite composite electrocatalyst subjected to external field polarization treatment and preparation method of nickel hydroxide and bismuth ferrite composite electrocatalyst

The invention belongs to the technical field of hydrogen production by electrocatalytic decomposition of water, and particularly relates to a nickel hydroxide and bismuth ferrite composite electrocatalyst (Ni (OH) 2 and BiFeO3-P) for external field polarization treatment and a preparation method thereof. The method comprises the following steps: firstly, synthesizing bismuth ferrite (BiFeO3) powder through a hydrothermal method; then, by taking bismuth ferrite powder as a substrate, carrying out hydrothermal reaction again in the nickel-containing precursor solution, so that Ni (OH) 2 nanoparticles grow in situ on the surface of the BiFeO3 nanosheet to form a Ni (OH) 2 and BiFeO3 composite electrocatalyst; and finally, applying a high-voltage direct-current electric field (1-10 kV, and maintaining the pressure for 20-50 minutes) to the composite electrocatalyst, and carrying out external field polarization treatment. The polarization treatment induces BiFeO3 ferroelectric domain directional arrangement, enhances the built-in electric field intensity, drives electrons to transfer to Ni (OH) 2 and optimizes the distribution state of charges on the surface of the catalyst. According to the method provided by the invention, the oxygen evolution reaction (OER) activity and charge transfer efficiency of the composite electrocatalyst are remarkably improved, and an innovative solution is provided for developing a high-performance electrocatalyst.
Owner:CHINA JILIANG UNIV

Method for capturing co2 and use of a metal-based surface for capturing co2

A method for capturing CO2 from a fluid is provided. The method comprises the steps of providing a metal-based surface, adjusting the surface charge of the metal-based surface to a first state that allows adsorption of CO2 on the metal-based surface, and contacting the metal-based surface with the surface charge in the first state to a fluid containing CO2 to be captured, and allowing said CO2 to become adsorbed on the metal-based surface. The adjusting of the surface charge at step b) is carried out by (A) exposing or refraining from exposing the metal-based surface to radiation or (B) applying or refraining from applying a potential difference on the metal-based surface. The first state is one of the following (i) to (iii): (i) a positive surface charge, (ii) a negative surface charge, and (iii) a neutral surface charge.
Owner:SAHU TANAY +2

Method for preparing spherical charged carbon black electrophoretic particles through emulsion polymerization method and application of spherical charged carbon black electrophoretic particles

The invention provides a method for preparing spherical charged carbon black electrophoretic particles through an emulsion polymerization method and application of the spherical charged carbon black electrophoretic particles, and belongs to the technical field of electrophoretic display. According to the invention, an emulsion polymerization method is adopted, under the action of an emulsifier, carbon black and an organic functional monomer are dispersed in water to form a stable emulsion, under the action of an initiator, a polymerization reaction is carried out to obtain regular spherical nanoparticles, and the charge density of the particle surface is effectively regulated and controlled through a polymerizable charge control agent; therefore, high contrast and switchable low-power-consumption display of the display device are realized. The technical problems that in the existing process of preparing electrophoretic particles through emulsion polymerization, a coating layer is too thick, and the surface charge capacity is low are solved.
Owner:TIANJIN UNIV

Prediction method of surface charge density of triboelectric nanogenerator based on modified chitosan material

The present invention belongs to the field of nanoenergy and provides a method for predicting the surface charge density of a triboelectric nanogenerator based on a modified chitosan material. The method comprises the following steps: S1, preparing the modified chitosan; S2, testing and quantitatively characterizing the triboelectric polarity of the modified chitosan; S3, obtaining the surface potential energy and saturation charge density of the modified chitosan and its paired material; and S4, constructing a surface charge density prediction model for a triboelectric nanogenerator based on the modified chitosan material. The present invention can directly calculate the surface charge density of a triboelectric nanogenerator based on the modified chitosan material based on the degree of modification of the modified chitosan material, providing a solid theoretical basis for further research into the application of chitosan in the field of triboelectricity.
Owner:BEIHANG UNIV +1

Inorganic non-metallic particle reinforced metal matrix composite and electron source additive manufacturing method thereof

PendingCN122322507AElectron sourceMetallurgy
This invention relates to the field of additive manufacturing technology, specifically to an inorganic non-metallic particle-reinforced metal matrix composite material and its electron beam additive manufacturing method. This invention systematically solves the problem of powder blowing of dielectric insulating inorganic non-metallic particles in additive manufacturing by addressing electrostatic repulsion through surface metallization, mitigating thermal stress through composite powder optimization, and reducing heat input through process parameter control. It avoids the accumulation of surface charge in inorganic non-metallic particles under electron beam bombardment, which generates Coulomb repulsion and causes spatter leading to defects in the composite material, thus ensuring the uniform distribution of inorganic non-metallic particles during the printing process. Simultaneously, it solves the problem of large density differences between inorganic non-metallic particles and metal powder, leading to particle agglomeration or sedimentation and resulting in uncontrollable spatial distribution of the reinforcing phase. This has significant practical implications for the further application of high-volume-fraction inorganic non-metallic particle-reinforced metal matrix composites in electron beam additive manufacturing.
Owner:DONGGUAN UNIV OF TECH