376 results about "Zeta potential" patented technology

The invention discloses a PHA nano aqueous suspension as well as a preparation method and application thereof, and belongs to the field of high polymer materials and processing and application thereof. The suspension takes PHA resin as a dispersion phase and water as a continuous phase, the total solid content is 23-65wt%, the PHA resin accounts for 80-98.5 wt% of the total solid, and the assistant accounts for 1.5-20wt% of the total solid. The average particle size of PHA particles is 30-140 nm, D90 is smaller than or equal to 150 nm, the polydispersity index PDI is smaller than 0.3, and when the pH is 6.5-7.5, the absolute value of Zeta potential is larger than 30 mV. The preparation method comprises the following steps: pretreating the PHA raw material, preliminarily dispersing in a water phase under the action of the dispersion stabilizing aid, and carrying out high-energy homogenization treatment. The obtained suspension is stable in storage, has excellent barrier property and mechanical property after film formation, and is suitable for preparing biodegradable food packaging barrier coatings, water-based environment-friendly coatings and water-based adhesives.

The present invention provides a colloidal silica in which the average secondary particle diameter of silica particles is small, and the dispersion stability of silica particles can be maintained over a long period even under strongly acidic conditions of pH 3. The present invention also provides a method for producing the colloidal silica.　The present invention provides a colloidal silica containing silica particles, wherein the colloidal silica is characterized in that: the silica particles have an average secondary particle diameter of 20 nm or less as measured by a dynamic light scattering; the zeta potential measured under conditions of pH 3 is -20 mV or less; and the surface of the silica particles is modified with a sulfonic acid group.

The invention discloses a water treatment dosing method and dosing system based on alumen ustum detection, relates to the technical field of water treatment, and aims at monitoring equivalent parameters of alumen ustum forms in real time, enabling the alumen ustum forms to be equivalent to spherical particles and ignoring the influence of Brownian motion and fluid shearing on alumen ustum mechanics. Van der Waals force among alumen ustum particles is deduced according to equivalent parameters of alumen ustum forms, and then Zeta potential is deduced. The current metal particle concentration is determined according to the Zeta potential, and the steady-state dosage is adjusted according to the current metal particle concentration. According to the method, the DLVO mechanical field and the electrochemical potential distribution and control theory are fused, a multi-physics field coupling model is constructed, real-time updating of force field parameters under spatio-temporal data driving is achieved, a sensing-decision-execution closed-loop control chain is formed, and the system response speed is remarkably increased.

The invention relates to a negative electrode material, a preparation method thereof and a lithium ion battery, the negative electrode material comprises a silicon-based material and a coating layer located on at least part of the surface of the silicon-based material, the silicon-based material comprises silicon oxide and lithium silicate, and the material of the coating layer comprises a carbon material; the method comprises the following steps: dissolving 20 mg of a negative electrode material in 10 ml of deionized water to form slurry, carrying out a Zeta potential test on the slurry by adopting a nanometer particle size and Zeta potential analyzer, in a Zeta potential test distribution diagram of the slurry, the intensity of a first characteristic peak of the slurry in a Zeta potential interval of-50 mV to-40 mV is I1, the intensity of a second characteristic peak of the slurry in a Zeta potential interval of-65 mV to-50 mV is I2, and the first characteristic peak and the second characteristic peak are shown in the specification. The intensity of the third characteristic peak in the Zeta potential interval of-35mV to-25mV is I3, and the relation among I1, I2 and I3 meets the conditions that I2 / I1 is greater than or equal to 0 and less than or equal to 2.0, and I3 / I3 is greater than or equal to 0 and less than or equal to 1.0. According to the negative electrode material, the volume expansion of the negative electrode material can be reduced, and the rate capability and the cycle performance of the negative electrode material are improved.

The invention discloses a preparation method of a high-negative-electricity nanofiltration membrane, which comprises the following steps: step 1, modifying a substrate by using an organic solvent to obtain a hydrophilic substrate; step 2, performing enhanced oxidation treatment on the biomass raw material to obtain biomass nanofibers carrying oxygen-containing functional groups, and depositing the biomass nanofibers on the surface of the hydrophilic substrate to form a biomass nanofiber middle layer; the enhanced oxidation treatment is one or more of oxidant coupling acid treatment, alkali treatment and cell disrupter ultrasonic treatment; the usage amount of the oxidizing agent is 5-50 wt%; and 3, carrying out interfacial polymerization reaction on a polyamine monomer and an acyl chloride monomer on the surface of the biomass nanofiber intermediate layer to prepare the polyamide active layer with the surface Zeta potential lower than-90mV. The high-negative-electricity nanofiltration membrane obtained by the invention has low Zeta potential, high permeability and high ion separation efficiency; the surface of the high-negative-electricity nanofiltration membrane can enhance the Donnan repulsive effect, and the hydrophilicity of the surface of the membrane is improved through a carboxyl-rich structure.

The invention relates to the technical field of biological medicines, in particular to Hangzhou white chrysanthemum-derived exosome-like nano-vesicles as well as a preparation method and application thereof. Chrysanthemum morifolium ramat nano-vesicles are prepared from compositae plants through a high-speed centrifugation method, the average particle size of the nano-vesicles is 68 nm, and the Zeta potential is-19.50 + / -1.10 mV. The nano vesicles can effectively protect nerve cells and improve anxiety behaviors and cognitive impairment of SAE mice. The compound has a good application prospect in preparation of medicines for treating neuroinflammation and SAE.

The invention discloses a preparation method of stable spray granulation silicon nitride slurry and granulation powder, and belongs to the technical field of ceramic materials. According to the invention, absolute ethyl alcohol is adopted as a solvent, so that the problem that silicon nitride slurry is easy to hydrolyze is solved, and the temperature during spray granulation is reduced. On the basis that a dispersing agent is added into slurry, tetramethylammonium hydroxide is added into the slurry, the Zeta potential value of the slurry is increased, the slurry is made to be in an alkaline environment, dissociation of Si-OH groups is promoted, more negative charges are carried on the surface of silicon nitride, meanwhile, zwitterions released by the tetramethylammonium hydroxide form a double-electron layer around silicon nitride particles, and therefore the conductivity of the silicon nitride particles is improved. The dispersity of the particles in the slurry is improved. The silicon nitride powder is more uniformly distributed in a medium such as a binder due to the improvement of the dispersibility, and the silicon nitride slurry with low viscosity, good dispersibility, good stability and good fluidity can be prepared. The slurry can be more symmetrically gathered and formed in the spray granulation process, and the sphericity degree and apparent density of granulation powder are improved.

The invention belongs to the technical field of cinnamyl aldehyde nanoemulsion detection, and particularly relates to a cinnamyl aldehyde nanoemulsion stability detection method and system. According to the method, the stability of the cinnamyl aldehyde nanoemulsion sample can be effectively evaluated by accurately controlling and monitoring the particle size and Zeta potential value change of the cinnamyl aldehyde nanoemulsion sample in the aging treatment process, and the aging abnormity of the sample can be found in time by setting a reasonable fluctuation threshold value and a reasonable fluctuation node, so that corresponding treatment measures are taken, and the quality of the cinnamyl aldehyde nanoemulsion sample is improved. In addition, the detection system can automatically adjust the monitoring frequency according to the detection result, samples under disordered distribution characteristics are monitored more frequently so as to ensure that potential stability problems can be found in time, and the detection accuracy of the cinnamyl aldehyde nanoemulsion sample is improved. And the loss risk caused by instability of the sample is reduced.

The disclosure provides a nanoemulsion including an oil phase containing at least one cannabinoid and a water phase; wherein at least one of the oil phase and the water phase includes one or more emulsifying agents; and wherein the zeta potential of the nanoemulsion is less than about −10 mV. Further provided are processes for preparing such nanoemulsions.

To provide a stainproof member capable of exhibiting both low protein adsorption performance and service durability.SOLUTION: Provided is a stainproof member with a membrane disposed on a substrate. The membrane has a condensate of a hydrolysate of a silane coupling agent or a condensate of a phosphonic acid derivative. The membrane has no halogen atoms, and in water at pH=7, a zeta potential of the membrane is -10.0 mV or more and 10.0 mV or less. When an amount of C atoms (atomic%) / an amount of atoms of an element X that is most abundant on the surface of the substrate (atomic%) is defined as A in an X-ray photoelectron spectroscopy analysis (ESCA measurement) on the substrate, and an amount of C atoms (atomic%) / an amount of atoms of the element X (atomic%) is defined as B in the X-ray photoelectron spectroscopy analysis (ESCA measurement) on the membrane of the substrate is defined as B, the value of B / A is 2.0 or more and 5.0 or less.SELECTED DRAWING: None

The invention provides a lithium-rich manganese-based precursor, a lithium-rich manganese-based positive electrode material, a preparation method of the lithium-rich manganese-based precursor, a preparation method of the lithium-rich manganese-based positive electrode material and a battery, the lithium-rich manganese-based precursor is composed of MnaNibM1-a-bO2, a is more than or equal to 0.55 and less than or equal to 0.75, and b is more than or equal to 0.2 and less than or equal to 0.4; m comprises at least three of Zr, Ru, Ga, B, Pb, As, Ba, Ce, La, Bi or Pt; the specific surface area of the lithium-rich manganese-based precursor is not less than 10m < 2 > / g. In the lithium-rich manganese-based precursor, the doping element M improves the component uniformity by adjusting the Zeta potential, forms a eutectic phase at the crystal boundary to inhibit the abnormal growth of crystal grains, enhances the structural uniformity, inhibits the structural collapse of the positive electrode material in circulation, and improves the cycle stability of the battery; meanwhile, pores of the lithium-rich manganese-based precursor provide channels for electrolyte permeation, active sites are increased due to the high specific surface area, lithium ion diffusion is accelerated jointly, and the specific discharge capacity of the positive electrode material is improved.

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 present invention belongs to the technical field of chemical engineering, and specifically provides a chemical mechanical polishing (CMP) composition and CMP method for a silicon carbide substrate. The composition includes abrasive alumina particles, an oxidizing agent and clay, wherein in the composition, the abrasive particles have a negative zeta potential at a pH of 7.5 to 9.5, and the clay has a z-average size of 1 nm to 20 μm measured by dynamic light scattering. The CMP composition provided by the present invention can improve the polishing effect on the silicon carbide substrate, and can achieve good recirculation performance and a low number of surface defects while obtaining a high material removal rate and low surface roughness.

The invention discloses a flocculation dynamic control method and device, electronic equipment and a storage medium, and relates to the technical field of water treatment.The method comprises the steps that flocculation process parameters corresponding to a sewage flocculation device are collected in real time; the flocculation process parameters comprise at least one of the particle size of flocs in the sewage at the current moment, the Zeta potential of a shearing surface of a sewage stirring module in the sewage flocculation device and the shearing stress of the shearing surface; determining real-time control parameters of the sewage flocculation device based on at least one of the floc particle size, the Zeta potential and the shear stress; and controlling the sewage flocculation device to perform sewage flocculation treatment based on the real-time control parameters. According to the method, accurate control over the flocculation process is achieved, the problems of blind flocculant adding, high energy consumption and poor floc stability caused by parameter lag, high energy consumption and insufficient floc stability in a traditional process are effectively solved, and the floc forming effect is improved.

The invention discloses a preparation method of nano graphene oxide, which comprises the following steps: (1) dispersing graphene oxide in deionized water to obtain a graphene oxide dispersion liquid; (2) irradiating the graphene oxide dispersion liquid prepared in the step (1) to obtain a porous graphene oxide dispersion liquid; (3) adding peroxide into the porous graphene oxide dispersion liquid prepared in the step (2) to obtain mixed liquid; (4) heating and stirring the mixed solution obtained in the step (3) for reaction to obtain nano graphene oxide dispersion liquid; and (5) performing freeze drying on the nano graphene oxide dispersion liquid prepared in the step (4) to obtain nano graphene oxide powder. The average size of the nano graphene oxide prepared by the method is 20-80 nm; the average thickness is 1-3nm, the water dispersibility is excellent, and the absolute value of Zeta potential is not less than 20mV.

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 present invention relates to an electrode assembly including a positive electrode, a negative electrode, and a coating layer between the positive electrode and the negative electrode, in which the coating layer is formed in two or more layers in a stacking direction of the positive electrode and the negative electrode, in which the coating layer includes a first coating layer in facing contact with the negative electrode and a second coating layer not in facing contact with the negative electrode, the first coating layer contains any one type of particles selected from the following i) to iii), when the first coating layer contains i) or ii), the second coating layer contains iii), and when the first coating layer contains iii), the second coating layer contains i) or ii): i) oxide-based solid electrolyte particles and ceramic particles having an absolute value of zeta potential of 25 mV or more, ii) oxide-based solid electrolyte particles, and iii) ceramic particles having an absolute value of zeta potential of 25 mV or more.

The invention relates to polygonatum cyrtonema polysaccharide and application thereof. The novel polysaccharide PRP is extracted and purified from polygonatum cyrtonema and is neutral inulin type polysaccharide. The PRP takes a node alpha-D-glucose-(22)-beta-D-fructose similar to cane sugar as a center. The C6 site of glucose has an additional beta-fructose (2-> 6) substituent, and two chains extend out of the core through a (2-> 1)-beta-fructose bond to form a Y-type moderate branch structure. Compared with other selenium nanoparticles with stable polysaccharides, the selenium nanoparticles coated with polygonatum polysaccharide provided by the invention have smaller initial particle size, more negative zeta potential, stable batch repeatability and excellent long-term stability.

A battery includes an anode, a cathode, and a porous separator having a surface and percolating pores providing a porosity of from 20% to 80%. A passively impact resistant composite electrolyte includes an electrolyte and electrically non-conducting particles that enable shear thickening. The particles can have a polydispersity index of no greater than 0.1, an average particle size in a range of from 50 nm to 1 μm, and an absolute zeta potential of greater than ±40 mV. The shear thickening enabling particles can be from 10 wt. % to 40 wt. % of the total weight of the separator and shear thickening particles. Between 20-40 wt. % of the shear thickening enabling particles are located in the pores of the separator.

A method is provided for treating solid tumors in a human body, the method including intravenously administering nanoparticles (32) having a negative zeta potential (ZP) at neutral pH between -5 and -40 mV; and administering chemotherapy drug molecules (34) having a positive ZP at neutral pH or a ZP at neutral pH of between -10 mV and 0 mV. The nanoparticles (32) and the chemotherapy drug molecules (34) are separate from each other until in the human body. The nanoparticles (32) and the chemotherapy drug molecules (34) are administered in respective amounts that are therapeutically effective in combination. The nanoparticles (32) localize on cancer cells of the tumors. The chemotherapy drug molecules (34) are attracted to the nanoparticles (32) in the human body by the opposite charges of the chemotherapy drug molecules (34) and the nanoparticles (32), thereby facilitating localization of the chemotherapy drug molecules (34) on the cancer cells of the tumors. Other embodiments are also described.

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.

In the polishing pad according to an embodiment, the particle size of debris obtained during conditioning and the zeta potential of a debris solution are adjusted to specific ranges. As a result, it is possible to minimize the occurrence of defects and scratches during a CMP process while reducing the size of debris, thereby maintaining excellent physical properties and performance of the polishing pad.

The invention relates to a polyethyleneimine grafted indium sulfide composite material containing rich sulfur vacancies as well as a preparation method and application thereof, and belongs to the technical field of indium sulfide catalyst materials. The composite material comprises indium sulfide containing rich sulfur vacancies and polyethyleneimine grafted to the indium sulfide containing rich sulfur vacancies, the Zeta potential of the surface of the indium sulfide containing rich sulfur vacancies is negative, the Zeta potential of the surface of the polyethyleneimine is positive, and the composite material is formed through an electrostatic self-assembly method. The preparation method comprises the following steps: dispersing an indium source in a sulfur-containing organic matter, and heating to obtain indium sulfide containing rich sulfur vacancies; and adding the obtained indium sulfide containing rich sulfur vacancies into a polyethyleneimine solution, and heating to obtain the polyethyleneimine grafted indium sulfide composite material containing rich sulfur vacancies. The PEI / In2S3-SV composite material obtained by the invention has the advantages of high hydrogen peroxide yield, simple and controllable preparation process and the like.

The invention provides a negative plate and a preparation method thereof, a battery, a battery pack and electric equipment, the negative plate comprises a negative active layer, and the Zeta potential of the negative active layer is less than or equal to-53 mV. According to the negative electrode plate provided by the invention, the Zeta potential of the negative electrode active layer is limited to be less than or equal to-53 mV, so that the electrostatic repulsive force among particles can be enhanced, particle aggregation is prevented, the dispersion uniformity and stability of the negative electrode active material in the negative electrode plate are improved, and black spots or dark lineation of the negative electrode plate are avoided; and the local lithium precipitation risk of the battery in the charging process is reduced.

The invention relates to the technical field of optical detection, in particular to a method and system for measuring electrophoresis mobility and zeta potential, and the method comprises the steps: collecting a multi-source signal in real time, the multi-source signal comprising an electric field signal, a scattered light signal and an environmental parameter; the scattered light frequency of the scattered light signals is extracted, two paths of orthogonal reference signals are generated, and whether frequency drift occurs or not is judged; when frequency drift occurs, the phases and the frequencies of the two paths of orthogonal reference signals are adjusted, and the two paths of synchronous orthogonal reference signals are output; extracting a phase signal of the scattered light signal; performing real-time cross-correlation calculation on the phase signal and the electric field signal, outputting a cross-correlation function, extracting features, and outputting an average phase; the electrophoresis mobility and the zeta potential are output; and generating a feedback report. The method has the effect of accurately acquiring information of small electrophoresis mobility in a non-aqueous phase system or a high-conductivity suspension so as to obtain zeta potential.

The present invention relates to a graphene ink composition including charged chemically modified graphene, a graphene flake, a binder and a solvent, wherein an absolute value of the zeta potential of the charged chemically modified graphene is 25 mV or more.

An infrared absorbing material fine particle dispersion liquid including infrared absorbing material fine particles and a solvent, the infrared absorbing material fine particles containing fine particles of composite tungsten oxide represented by a general formula MxWOy, the solvent containing water, wherein an absolute value of a zeta potential of the infrared absorbing material fine particle dispersion liquid is 5 mV or more and 100 mV or less.

The invention relates to the technical field of wet-process phosphoric acid purification, in particular to acid-resistant nanofiltration membrane modification liquid, a modified acid-resistant nanofiltration membrane and application of the modified acid-resistant nanofiltration membrane. The acid-resistant nanofiltration membrane modification liquid is prepared from the following components in percentage by mass: 26 to 32 percent of phosphoric acid, 2.0 to 3.0 percent of PEI1800 and 2.5 to 3.5 percent of N, N, N-trimethyloctadecane-1-ammonium iodide. The acid-resistant nanofiltration membrane is modified by using the modification liquid, so that a relatively high Zeta potential is attached to the surface of the acid-resistant nanofiltration membrane, the flux of the membrane is greatly improved under the condition that the interception performance of the membrane is not reduced, and the interception rate of the nanofiltration membrane on cation impurities in phosphoric acid is enhanced when the acid-resistant nanofiltration membrane is applied to purification of wet-process phosphoric acid or preparation of electronic-grade phosphoric acid; meanwhile, the rejection rate of the nanofiltration membrane on phosphoric acid is reduced, and efficient separation and purification of phosphoric acid and impurity ions are achieved.