284 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 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 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 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.

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 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 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.

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 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 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.

The embodiment of the invention discloses a standard substance for simulating biological Zeta potential detection and a preparation method thereof. The method comprises the following steps: (1) preparing a 100-500nm carboxylated nano-microsphere suspension by adopting an emulsion polymerization method; (2) carrying out suction filtration on the 100-500nm carboxylated nano-microsphere suspension through a filter membrane to obtain filtrate; and (3) preparing a phosphate buffer solution with a standard concentration by using the filtrate as a solvent, adding lauryl sodium sulfate, and aging to obtain the standard substance for simulated organism Zeta potential detection. The standard substance provided by the invention can be used for calibrating and verifying a Zeta potential detection instrument, so that the detection accuracy and reliability are improved; meanwhile, the material can be used as an important tool for researching the property and function of surface charges of biomolecules, powerful support is provided for research in the fields of biomedicine and material science, and in addition, the preparation method has the advantages of being simple in process, high in repeatability and capable of simulating Zeta potentials of different biological systems and has a good application prospect.

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 anionic manganese oxide nanoparticle nucleic acid scavengers are biodegradable anionic scavengers with low cytotoxicity, which are able to scavenge (bind) cell-free nucleic acids (e.g., extracellular ssRNA, dsRNA, and unmethylated DNA), providing treatment for various medical conditions. The main component of the scavenger is manganese oxide, which may be synthesized by using a manganese compound (e.g., manganese acetate) and an acid (e.g., tannic acid) at high temperature (e.g., 100-150° C.). Synthesis may be performed by mixing a manganese compound and an acid in water forming a mixture, which is stirred, heated, and allowed to cool. The anionic manganese oxide nanoparticles are extracted from the cooled mixture. The typical size of the resultant nanomaterials ranges from 30 to 100 nm; the zeta potential of the as-prepared nanomaterials is about −20 mV. The nanoparticles have various uses, including administration to a subject to treat inflammation or to treat cancer.

The invention provides a chemical-mechanical polishing composition comprising: (a) a silica abrasive, (b) a buffering agent, and (c) water, wherein the polishing composition has a pH of about 1 to about 7 and the silica abrasive has a zeta potential of about −10 mV to about −50 mV in the polishing composition. The invention also provides a method of chemically-mechanically polishing a substrate, especially a substrate comprising silicon carbide and / or silicon nitride, using said composition.

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.

Provided are: a composition for chemical mechanical polishing; and a polishing method using the same. The composition allows rapid polishing of a polishing surface that contains a silver material for wiring, and makes it possible to obtain a polished surface having a high reflective property. This composition for chemical mechanical polishing comprises (A) abrasive grains, (B) a liquid medium, (C) an oxidizing agent, and (D) a nitrogen-containing hetrocyclic compound. The absolute value of the zeta potential of the (A) component of the composition for chemical mechanical polishing is 10 mV or more. When the content of the (C) component is noted as Mc (mass %) and the content of the (D) component is noted as Md (mass %), Mc / Md is 10 to 200.

The invention belongs to the technical field of catalysts, and provides a platinum nano oxygen reduction catalyst and a preparation method and application thereof.The preparation method of the platinum nano oxygen reduction catalyst comprises the following steps that an MOF derived carbon material is dispersed in a mixed solution of deionized water and ethyl alcohol, and a mixed solution is obtained; selecting a compound containing a platinum coordination unit with negative charge or positive charge according to positive and negative Zeta potential, stirring at room temperature, and fully adsorbing the two compounds by utilizing electrostatic acting force to obtain a reaction solution; and evaporating the reaction solution to dryness, and then carrying out a reduction reaction at 300-600 DEG C in a hydrogen reducing atmosphere to obtain the platinum nano oxygen reduction catalyst. The obtained catalyst is applied to a proton exchange membrane fuel cell, on one hand, the stability of platinum nanoparticles is improved through the micropore confinement effect, poisoning of perfluorosulfonic acid and other polymer electrolytes is avoided, on the other hand, pore channels are communicated, mass transfer is effectively enhanced, and the catalyst subjected to confinement shows excellent catalytic activity.

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.

The present application relates to a kind of nano platinum colloids and its preparation method and its application, the average particle size of the nano platinum colloids is 50-100nm, D90 is 100-150nm, D10 is 30-70nm, zeta potential is-25mV to-40mV, pd I is 0.2-0.5, sphericity is 0.85-0.97.The nano platinum colloids prepared by the present application has small particle size, as catalyst has higher catalytic efficiency, can quickly capture hydrogen to occur reaction, is not influenced by hydrogen escape, is used in the detection reagent for determining the dissolved hydrogen concentration in water, reaction rate is fast, titration result is more accurate.

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.