133 results about "Zeta potential" patented technology

The invention provides a polysilicate aluminum zirconium coagulant as well as a preparation method and application thereof, and relates to the technical field of solid waste recycling. The preparation method of the polysilicate aluminum zirconium coagulant comprises the following steps: S1, activation preparation of a polysilicate solution; S2, introduction and pre-complexation of a metal salt solution; and S3, alkalization induced polymerization and curing. According to the invention, the efficient charge neutralization capability of zirconium and aluminum metal ions and the long-chain network structure characteristic of polysilicic acid are organically combined through a copolymerization reaction by molecular design, the developed polysilicate aluminum zirconium coagulant can maintain a good coagulation effect in a wide pH range, is suitable for treating residual sludge with different sources and properties, and has a good coagulation effect under the dosage of 7.5%. The CST value is reduced to 35.4 s from 190.7 s, the water content of a filter cake is reduced to 77.4%, and the Zeta potential is-8.2 mV, so that the polysilicate aluminum ferric coagulant is obviously superior to a traditional polysilicate aluminum ferric coagulant, and has the advantages of high operation flexibility, good process stability and good application prospect.

One disclosed method involves separating an injection-molding part / an adhesively bonded part by using a nanobubble solution by immersing a device to be treated in a nanobubble solution while heating and stirring, wherein the device to be treated and the nanobubble solution are oppositely charged, an absolute value of the Zeta potential of the nanobubble solution is greater than or equal to 25 mV, and an average particle size of nanobubbles in the nanobubble solution is less than or equal to 200 nm. The use of a nanobubble solution for recycling waste electronic equipment is also disclosed. Compared with a traditional recovery method, some examples of the disclosed method for separating an injection-molding part / an adhesively bonded part only need energy, water, and air, can treat a series of waste electronic products of different types in batches, and can realize effective plastic removal and debonding of a substrate in a green and efficient manner.

The invention discloses a thickener dosing control method and system, and relates to mineral processing. The method comprises the following steps: acquiring concentration values measured by an ith concentration sensor at different depths at a moment t; obtaining the turbidity T of the overflow water, the effective viscosity of the overflow water or underflow, the volume fraction of fine particles and the volume fraction of coarse particles in the overflow water, the Zeta potential of the feeding end, the Zeta potential of the overflow end, the time derivative of the Zeta potential of the overflow end, the equivalent diameter d of the particles, the density of the particles, the density of the fluid and the viscosity of the fluid; calculating the effective settling velocity of the particle swarm; carrying out online correction on the effective settling velocity by utilizing a least square method or a Kalman filtering algorithm; performing time lag correction on the concentration values at different depths by using the corrected effective settling velocity; correcting the turbidity T of the overflow water according to the corrected concentration profile; respectively calculating a flocculant dosing rate and a coagulant dosing rate; according to the invention, accurate cooperative control of the dosing rate of the flocculating agent and the coagulant is improved through the artificial intelligence model.

The invention relates to the technical field of ceramic composite material preparation, in particular to diamond / silicon carbide double-phase homogeneous suspension slurry and a preparation method thereof. Comprising the following steps: setting the total integral number of diamond and silicon carbide in slurry as well as the volume ratio of diamond to silicon carbide according to requirements; preparing a water-based suspension according to a set total integral number and volume ratio; measuring Zeta potentials of the suspension under different pH values, and recording the pH value corresponding to the maximum absolute value of the Zeta potential as an optimal pH value A; selecting a dispersing agent according to the optimal pH value A; adding a dispersing agent into the suspension, and determining the optimal addition amount of the dispersing agent by taking approaching the optimal pH value A as a standard; diamond particles, silicon carbide particles, deionized water and a dispersing agent are mixed in proportion, and diamond / silicon carbide double-phase homogeneous suspension slurry is obtained through dispersing treatment. The preparation method has the advantages that the double-phase proportion and distribution can be accurately regulated and controlled, and the slurry is low in viscosity, good in stability and suitable for various forming processes.

The invention discloses a fly ash washing dechlorination and resource utilization method. The method comprises the steps of fly ash pretreatment, size mixing treatment, enhanced washing and solid-liquid separation, filter cake treatment and mixed washing liquid purification and salt separation crystallization. Through a multi-dimensional synergistic strengthening means, the fly ash dechlorination efficiency is remarkably improved, resource utilization is achieved, the sodium citrate and lauryl sodium sulfate composite additive is adopted, Zeta potential real-time monitoring and pulse type supplementing are combined, fly ash particles are effectively dispersed, mass transfer resistance is destroyed, dissolution of chloride ions is promoted, and the dechlorination effect of the fly ash is improved. Moreover, gradient heating, electric field assistance and redox potential regulation are introduced, so that heavy metal dissolution is inhibited while efficient dechlorination is performed.

The application discloses a preparation method of a novel composite SERS substrate based on MXene and trace detection application thereof, and particularly relates to the technical field of nanomaterials and spectral detection technology, wherein the substrate takes single-layer MXene nanosheets as a carrier; after synthesis, ZnO crystal seeds are subjected to mediated growth, and the Zeta potential difference between the MXene nanosheets and the ZnO crystal seeds is utilized to make the ZnO crystal seeds loaded on the surface of the MXene nanosheets through electrostatic adsorption to obtain a MXene / ZnO composite material; an Ag@Au core-shell structure is modified on the MXene / ZnO composite material, and finally, a MXene / ZnO@Ag@Au composite material, namely the composite SERS substrate, is obtained.

A metal-resin composite that has a structure in which a plurality of metal particles are fixed to resin particles and, in the range of pH 3 to pH 10, the maximum value of the zeta potential is at least 5 mV and the minimum value is −5 mV or less. In this metal-resin composite, it is preferable that, in the range of pH 3 to pH 10, the difference between the maximum value and the minimum value of the zeta potential is at least 20 mV; and it is further preferable that the point of zero charge of the zeta potential is in the range of pH 3.5 to pH 9.0. This metal-resin composite can be used in immunoassays and in immunoassay reagents as a labeled substance by making antigens or antibodies adhere to the surface of the metal-resin composite.

The invention discloses a PH response type modified polydopamine nano preparation loaded with icariin and application of the PH response type modified polydopamine nano preparation in myocardial ischemia resistance, and belongs to the technical field of biological medicine. The nano preparation takes polydopamine (PDA) as a carrier core, the carrier core is modified by methoxy polyethylene glycol (mPEG) and then loaded with icariin (ICA), and the nano preparation is named as mPEG-PDA (at) ICANPs; the preparation process comprises the steps of synthesis of mPEG-OTs, synthesis of mPEG-EDA, synthesis of PDA, preparation of mPEG-PDANPs and preparation of mPEG-PDA (at) ICANPs, under the optimal condition, the particle size of the preparation is 179.6 + / -0.432 nm, PDI is 0.130 + / -0.004, the Zeta potential is 23.4 + / -0.436 mV, the stability is good after the preparation is stored in a dark place at 4 DEG C for 30 days, the ICA drug loading capacity is 14.6 + / -1.08%, the encapsulation efficiency is 64.37 + / -2.31%, and the drug cumulative release rate reaches 73.31 + / -1.64% (pH response drug release) in an environment with the pH value of 6.5 for 72 hours. An in-vitro H9c2 cell OGD model experiment proves that the preparation can remarkably improve the survival rate of ischemic myocardial cells, inhibit apoptosis and reduce LDH release, and the effect of the preparation is superior to that of free ICA. The invention provides an efficient targeting drug delivery system for resisting myocardial ischemia, and has important clinical application value.

The utility model relates to electric potential measurement technical field especially is a kind of Zeta electric potential measuring device, including carousel, the upper clamping mechanism is fixed with the lower end of carousel, the lower clamping mechanism is correspondingly arranged in the lower end of upper clamping mechanism, and the upper clamping mechanism and the lower clamping mechanism are connected by thread sleeve, and the installation hole of upper clamping mechanism and lower clamping mechanism is placed to the sample to be measured. By rotating thread sleeve, since the thread direction of thread side ring is opposite, the upper clamping mechanism and the lower clamping mechanism will move oppositely. At this time, extrusion plate will pass through the triangular block of extrusion limiting mechanism in the moving process, so as to drive metal sheet deflection extrusion to sample and apply uniform pressure, firmly clamp sample between upper and lower clamping mechanism, and it is convenient to operate for different size samples.

A dispersion solution contains a complex of cerium oxide nanoparticle with protein in which a hydrodynamic diameter and zeta potential of the protein are maintained. The dispersion solution is produced by mixing a solution containing the protein with a solution containing a cerium (III) ion or with a cerium (III) salt followed by adding an oxidizing agent thereto.

The present invention provides a measurement method and a measurement device for Zeta potential with reproducible high reliability and high precision by predicting equilibrium value from temporal change of streaming potential. In measuring Zeta potential on the surface of a sample using a streaming potential method, an external pressure is changed in steps to set a pressure change curve having an ascending phase or a descending phase with a time shorter than a relaxation time τ required for a streaming potential change response to occur with a change in external pressure, and a stable phase in which the pressure is kept in a stable state for a time longer than the relaxation time τ. Then, Zeta potential is calculated using a streaming potential asymptotic value estimated by regression from a transient response of streaming potential generated from the pressure change curve.

The present application relates to the technical field of reactors, and particularly relates to a calculation method of corrosion product deposition rate of a pressurized water reactor. The calculation method of corrosion product deposition rate of the pressurized water reactor comprises the following steps: obtaining the concentration distribution and Zeta potential distribution of metal ions related to corrosion products; obtaining the electric field force on the particle state corrosion products based on the Zeta potential distribution; tracking the transport trajectory of the particle state corrosion products by using a discrete phase model, wherein the force on the particles in the transport process comprises the electric field force; calculating the particle mass flow rate according to the discrete phase model; and calculating the deposition rate and erosion rate of the particle state corrosion products on the wall surface according to the particle mass flow rate. The present application can be used to solve the problem that the current calculation model cannot accurately predict the CRUD deposition rate, and can improve the authenticity of CRUD growth prediction and the reliability of reactor safety analysis.

This invention provides a negative electrode sheet and its preparation method, a battery, a battery pack, and an electrical device. The negative electrode sheet includes a negative electrode active layer, and the zeta potential of the negative electrode active layer is less than or equal to -53 mV. The negative electrode sheet provided by this invention, by limiting the zeta potential of the negative electrode active layer to less than or equal to -53 mV, can enhance the electrostatic repulsion between particles, prevent particle aggregation, improve the dispersion uniformity and stability of the negative electrode active material in the negative electrode sheet, avoid the appearance of black spots or dark streaks on the negative electrode sheet, and reduce the risk of localized lithium plating during battery charging.

Provided are: a tin oxide particle dispersion liquid in which tin oxide particles are dispersed in a solvent, the tin oxide particle dispersion liquid being characterized in that the Zeta potential at pH 10 is-35 mV or less; the tin oxide particle dispersion liquid is capable of forming a tin oxide particle laminated film in which tin oxide particles are uniformly arranged and which has excellent electrical conductivity. The tin oxide particles may be doped with a heterogeneous element. It is preferable that the dissimilar element is one or more elements selected from among antimony, fluorine, and phosphorus. The primary particle diameter of the tin oxide particles is preferably in the range of 1.5 nm or more and 100 nm or less.

The application discloses a cleaning method for removing a suction pen mark on a surface of a silicon carbide substrate and the silicon carbide substrate, and belongs to the technical field of silicon carbide detection. The cleaning method comprises the following steps: (1) using a mixed solution of ammonia and hydrogen peroxide to clean the surface of the substrate, so as to pre-oxidize the surface of the substrate; (2) using ozone water to clean the pre-oxidized substrate, so as to obtain a substrate containing an oxidation layer; and (3) using an acidic cleaning solution with a pH value of 2.0-3.5 to clean the substrate containing the oxidation layer, and then performing water washing and blowing dry, so as to obtain a cleaned silicon carbide substrate. The method can change the Zeta potential of the oxidation layer on the surface of the substrate, so that the surface potential of the substrate is not lower than 0 mV, thereby reducing the adsorption of positively charged particles on the suction pen, achieving the technical effect of completely removing the suction pen mark, and improving the quality of the silicon carbide substrate.

The present invention relates to a drug carrier comprising mesoporous silica nanoparticles and, more specifically, to a carrier comprising mesoporous silica nanoparticles and a bioactive component, wherein the mesoporous silica nanoparticles have a predetermined diameter and surface zeta potential, and the bioactive component is a peptide containing a fatty acid chain. The carrier comprising mesoporous silica nanoparticles of the present invention effectively encapsulates peptides containing fatty-acid chains, and exhibits excellent intracellular delivery and release efficiency of the bioactive ingredient. Accordingly, effective drug delivery can be achieved with a small amount of the carrier.

This invention relates to the field of geothermal energy development, and discloses modified non-metallic materials, their preparation methods, and applications. The modified non-metallic materials have an oxygen content of 0.5-1.5 wt%, a Zeta potential of -30 mV to -15 mV, and a contact angle of 30°-55°. The interlayer spacing ratio between the modified non-metallic material and the unmodified non-metallic material is 1:0.8-1.1. The modified non-metallic material of this invention exhibits good dispersibility in cement slurry, thereby providing thermal conductivity to cement while improving the uniformity and stability of the cement slurry. Furthermore, even when the amount of modified non-metallic material added to the cement slurry is higher than the conventional amount, it does not affect the rheological properties of the cement slurry, thus effectively further improving the thermal conductivity of the cement slurry and meeting the needs of geothermal energy development.

The invention discloses a preparation method of a nanoscale tungsten disulfide colloidal suspension, which belongs to the field of tungsten disulfide preparation, and comprises the following steps: step 1, adding tungsten disulfide powder into a solvent, and adding a surfactant or a stabilizer to obtain a mixed solution; step 2, carrying out tungsten disulfide interlayer stripping treatment on the mixed solution to generate a suspension containing nanosheets or nanoparticles with the transverse size of less than 100nm and the thickness of less than 5nm; 3, the suspension liquid obtained after ultrasonic treatment is subjected to centrifugal treatment, and supernate serves as preliminarily purified nanometer tungsten disulfide dispersion liquid; step 4, adjusting the pH value of the nano tungsten disulfide dispersion liquid to 7-8, and adding a polymer stabilizer to enable the absolute value of the Zeta potential of the system to be greater than 30mV; step 5, performing impurity removal and filtration on the suspension to remove residual micron-sized impurities; 6, the obtained filtrate is the prepared stable nanoscale tungsten disulfide colloidal suspension, and the stable nanoscale tungsten disulfide colloidal suspension is packaged into a preset container to be stored.

The invention provides a short-range direct filter membrane for removing mine water suspended solids, a preparation method and a system, the preparation method is used for preparing printing slurry, and the printing slurry comprises hydrophilic light-cured resin and a nano hydrophilic modifier with positive electricity; carrying out integrated 3D printing by utilizing the printing slurry according to the designed model to generate a green filter membrane; the green filter membrane is provided with a plurality of vertical main pore channels penetrating through the green filter membrane; the green filter membrane is sequentially subjected to cleaning, curing post-treatment and plasma surface modification treatment, and the short-range direct filter membrane is obtained; the surface Zeta potential of the short-range direct filtration membrane is 5-15mV, and the contact angle between the short-range direct filtration membrane and water is less than 10 degrees. The invention solves the problems of easy pollution, low flux, complex pretreatment and the like of the traditional filter membrane, is suitable for short-range direct filtration treatment of high-suspended-matter mine water (less than or equal to 2000mg / L), and realizes low-cost, efficient and energy-saving operation.

This invention provides a chemical mechanical polishing composition comprising: (a) a silica abrasive, (b) a surfactant, (c) an iron cation, (d) optionally a ligand, and (e) water, wherein the silica abrasive has a negative zeta potential in the chemical mechanical polishing composition. This invention also provides a method for chemically mechanically polishing a substrate, particularly a substrate comprising a carbon-based film, using the said composition.

The present disclosure provides a means by which a good polishing removal rate for an object to be polished including a silicon-containing material can be realized while at the same time reducing scratches on the surface of the object to be polished that has been polished. The present disclosure is a polishing composition containing: abrasive grains having a zeta potential of −5 mV or less; a first polyoxyalkylene compound having a weight average molecular weight of 100 or more and 900 or less; and a second polyoxyalkylene compound having an oxyalkylene unit different from that of the first polyoxyalkylene compound and having a weight average molecular weight of 100 or more and 900 or less, wherein the polishing composition has a pH of less than 7.

The invention discloses a triphenylmethane dye metabolite rapid detection method based on magnetic nano-enzyme selective oxidation and a preparation method of magnetic nano-enzyme, a novel nano-enzyme MnFe2O4 / PSS of sodium polystyrenesulfonate (PSS) modified magnetic ferrite (MnFe2O4) is prepared by adopting a coprecipitation method, the morphology and Zeta potential of the nano-enzyme are changed by doping PSS, and the magnetic nano-enzyme can be used for rapidly detecting the metabolite of the triphenylmethane dye. The nano-enzyme can react with leuco crystal violet and leuco malachite green more quickly, the leuco crystal violet and the leuco malachite green are oxidized into corresponding crystal violet and malachite green without further oxidation, after the reaction is completed, the error of a detection system can be reduced by utilizing magnetic separation, and by detecting the ultraviolet absorption peak intensity of oxidation products of the nano-enzyme, the detection accuracy is improved. A triphenylmethane dye metabolite oxidation-detection system is established, the magnetic nano-enzyme has good magnetism, the influence of the nano-enzyme on the absorbance of the system can be reduced through simple magnetic separation, and the purposes of reducing experimental errors and accurately detecting are achieved.

The invention relates to the technical field of reactors, in particular to a method for calculating the deposition rate of a pressurized water reactor corrosion product. The method for calculating the deposition rate of the corrosion product of the pressurized water reactor comprises the following steps: acquiring concentration distribution and Zeta potential distribution of metal ions related to the corrosion product; acquiring an electric field force applied to the particulate corrosion product based on the Zeta potential distribution; a discrete phase model is adopted to track the transportation track of the particle-state corrosion product, and the force borne by particles in the transportation process comprises the electric field force; according to the discrete phase model, calculating to obtain a particle mass flow rate; and according to the particle mass flow rate, the deposition rate and the erosion rate of the particle-state corrosion product on the wall surface are calculated. The method can be used for relieving the problem that a current calculation model cannot accurately predict the CRUD deposition rate, and the authenticity of CRUD growth prediction and the credibility of reactor safety analysis can be improved.

The present invention relates to colloidal silicon dioxide containing silicon dioxide particles with a small average secondary particle size and dispersion stability that can be maintained for extended periods even under strongly acidic conditions at a pH of 3 or less, and to a method for its preparation. The present invention relates to colloidal silicon dioxide comprising silicon dioxide particles, wherein the silicon dioxide particles have an average secondary particle size of 20 nm or less, as measured by dynamic light scattering, and a zeta potential of -20 mV or less, as measured at a pH of 3, and are surface-modified with a sulfonic acid group.

The invention relates to a high-dispersity irradiation shielding filler, a preparation method thereof and an irradiation shielding composite material. The preparation method comprises the following steps: carrying out oxidation-hydroxylation pretreatment on a composite filler containing a high-atomic-number gamma-ray shielding filler and a neutron absorption filler in an alkaline hydrogen peroxide aqueous solution; mixing and reacting the composite filler with an anionic polyelectrolyte solution to form a first charge layer; reacting the composite filler with a mixed solution of an amino-containing silane coupling agent and polyether amine to form a second charge layer with opposite polarity; and carrying out surface microgelation on the filler by using a multifunctional epoxy cross-linking agent to obtain the high-dispersity irradiation shielding filler. Compared with the prior art, the high-dispersity irradiation shielding filler with the Zeta potential absolute value not smaller than 30 mV is successfully prepared, and the high-dispersity irradiation shielding filler can be further used for preparing an irradiation shielding composite material.

The invention claimed herein relates to a dielectric polishing composition and a method thereof. The invention claimed herein particularly relates to a composition comprising: (A) surface-modified colloidal silica particles comprising negatively charged groups on the surface of the particles, wherein the surface-modified colloidal silica particles have a negative charge, a particle size of 60 nm to 200 nm, and a zeta potential of < -35 mV at a pH in the range of > 2.0 to < 6.0; (B) at least one corrosion inhibitor selected from at least one guanidine derivative; (C) at least one iron (III) oxidizing agent; (D) at least one buffering agent selected from at least one basic amino acid having an isoelectric point (pi) of > 6.5; (E) at least one stabilizer; and (F) an aqueous medium, wherein the pH of the composition is in the range of > 2.0 to < 4.3, and wherein the composition has a polyacrylamide content of < 1 ppm.

The invention relates to the field of adsorption materials, and discloses a lithium ion adsorption material and a preparation method and application thereof. The lithium ion adsorption material comprises a polyamide skeleton and 70-88 wt% of a lithium ion sieve dispersed on the polyamide skeleton, the polyamide forming the polyamide framework comprises 10 to 29 weight percent of a structural unit I from the acrylonitrile-itaconic acid copolymer and 0.01 to 0.18 weight percent of a structural unit II from branched polyethyleneimine; on the basis of the total weight of the polyamide skeleton, the content of the amide group is 0.1-1.2 wt%; and the Zeta potential of the lithium ion adsorption material is-25 eV to-0.1 eV. The lithium ion adsorption material has highly through three-dimensional network holes, hydrophilicity, charge property and high adsorbent powder loading capacity, is beneficial to rapid water / ion exchange, and shows excellent lithium adsorption performance. When being used for extracting lithium in a liquid environment, the composite material has high lithium adsorption capacity and cation selectivity.

This invention discloses a method for preparing high-charge, fast-response carbon black electrophoretic particles, belonging to the field of electrophoretic display technology. The invention employs a three-step surface modification method for carbon black: first, the carbon black is oxidized to introduce active functional groups onto its surface; then, a silane coupling agent is used for graft modification to introduce polymerizable double bonds; finally, under the synergistic regulation of a dual charge control agent, a polymer coating layer is formed on the carbon black surface through a stepwise polymerization process. The carbon black electrophoretic particles prepared by this invention exhibit regular morphology and high Zeta potential, demonstrating fast response speed and excellent dispersion stability in an electric field. This effectively solves the technical problems of easy agglomeration, slow response, and poor stability of existing carbon black electrophoretic particles, significantly improving the overall performance of electrophoretic display devices.

This invention discloses a preparation process for high-zircon content zircon bricks, belonging to the field of refractory materials technology. This process aims to solve the technical problem of the inability to achieve low-temperature full densification of zircon materials due to their easy decomposition at high temperatures during traditional sintering. The main steps include: firstly, preparing active zircon micropowder with high lattice strain energy through high-energy grinding; secondly, using heterogeneous agglomeration technology to coat the active micropowder onto the surface of inert coarse aggregate, constructing a "core-shell" structure granulated material; and finally, performing low-temperature solid-state sintering below the decomposition temperature, utilizing the distortion energy stored in the active micropowder to drive densification. This process simultaneously controls amorphization degree, Zeta potential, debinding oxidation, sintering atmosphere, and cooling regime. This invention successfully prepares high-density, high-strength, highly erosion-resistant, and glass-phase-free high-performance zircon bricks, suitable for harsh environments such as glass melting furnaces, while completely avoiding the thermal decomposition of zircon.

The application provides a method for strengthening leaching of ionic rare earth, which is based on regulation of ZETA potential and seepage rate of clay mineral by cation and anion coordination adsorption to improve leaching efficiency of ionic rare earth, and comprises the following steps: providing ionic rare earth ore, citrate solution and non-ammonium inorganic salt solution, wherein the liquid-solid ratio of the citrate solution to the ionic rare earth ore is 0.1-0.5:1, and the liquid-solid ratio of the non-ammonium inorganic salt solution to the ionic rare earth ore is 0.9-0.5:1; using the citrate solution to perform first leaching treatment on the ionic rare earth ore to obtain first leaching solution; using the non-ammonium inorganic salt solution to perform second leaching treatment on the ionic rare earth ore to obtain second leaching solution; performing first post-processing treatment on the first leaching solution to obtain rare earth; and performing second post-processing treatment on the second leaching solution to obtain rare earth. The method for leaching ionic rare earth has the advantage of high leaching rate.