20 results about "Surface charge" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a surface charge enhanced titanium-based coagulant as well as a preparation method and application thereof. The coagulant is prepared from a hydrolyzable titanium source precursor and a multifunctional cationization coordination agent simultaneously containing (a) an anchoring group, (b) a quaternary ammonium salt group and (c) C8-C22 alkyl through a sol-gel reaction in an anhydrous alcohol solvent in one step, the coordination agent is bonded with a titanium-oxygen skeleton through an anchoring group, and still keeps a potential greater than + 15 mVZeta in a high-pH water body. The flocculant is synthesized at room temperature, is simple in process, large in floc particle size and fast in sedimentation, shows an excellent removal effect on high-algae, low-temperature, low-turbidity, high-humic-acid and emulsified oil wastewater, and can be used as an anti-biological-pollution pretreatment agent before membrane filtration, and titanium residues after filtration are lower than the detection limit.

The embodiments of the present disclosure provide an electrode plate, an electrolysis apparatus, and a laundry treatment device. Multiple through holes penetrating the electrode plate in the thickness direction of the electrode plate are formed in the electrode plate. The density of the through holes in the electrode plate is 1-10 / cm2. According to the electrode plate in the embodiments of the present disclosure, on the one hand, because the density of surface charge at the junction of the inner wall of the through hole and the surface of the electrode plate is larger, and the electric field intensity nearby is higher, the electrolysis efficiency can be greatly improved, more active substances such as hydroxyl radicals and active chlorine can be generated, and more microbubbles can also be generated, which can improve the sterilization, cross color prevention and washing effects.