51results about How to "Increase Zeta Potential" patented technology

The present invention relates to a nanoparticle comprising a specific binding reactant, said nanoparticle being useful for determining an analyte to which analyte or complex comprising said analyte said binding reactant is specific. Characteristic for the nanoparticle is that the diameter of said nanoparticle is less than 200 nm, said nanoparticle is coated with multiple said specific binding reactants to the extent that the affinity constant of said nanoparticle towards said analyte essentially exceeds that of free said binding reactant towards said analyte and/or the association rate constant between said nanoparticle and said analyte essentially exceeds the association rate constant between free said binding reactant and said analyte; and said nanoparticle comprises a detectable feature. The invention also relates to biochemical assays using said nanoparticle. The assay further relates to a proximity based homogenous assay comprising a first group labeled with an energy donating compound (donor) and a second group labeled with an energy accepting compound (acceptor), wherein the donor is luminescent and has a long excited state lifetime and the acceptor is luminescent having a short or long excited state lifetime or the acceptor is non-luminescent, and the increase or decrease, respectively, in the energy transfer from the donor to the acceptor resulting from shortening or lengthening, respectively, of the distance between said groups, is measured. Characteristic for the assay is that the donor is a nanoparticle.

The invention provides an electrochemical and anaerobic membrane combined biological sewage treatment plant and a treatment method thereof. The electrochemical and anaerobic membrane combined biological sewage treatment plant comprises a reaction tank in which a sacrificial anode electrode, a non-sacrificial anode electrode and a membrane module cathode are disposed. The electrochemical and anaerobic membrane combined biological sewage treatment plant further comprises a power supply device. A positive electrode of the power supply device is electrically and independently connected to the sacrificial anode electrode and the non-sacrificial anode electrode, respectively, and a negative electrode of the power supply device is electrically connected to the membrane module cathode. According to the present invention, electrochemistry and an anaerobic membrane bioreactor are combined, and pre-removal of pollutants, increase of sludge size and neutralization of sludge surface charges are achieved through electroflocculation; pollutants are electrostatically repelled by means of an electric field, and the morphology of a filter cake layer is improved by a hydrogen evolution reaction, achieving in-situ electrical cleaning of the membrane surface; the activity of microorganisms is stimulated by the electric filed so as to increase the metabolic rate of the microorganisms and promoting amethane yield. Moreover, pH decrease caused by metabolic acid production by microorganisms is mitigated by metal ions from electroflocculation.

The invention provides emulsified asphalt which is prepared from, 50wt%-60wt% of asphalt, 1.5wt%-4.5wt% of built emulsifiers and the balance water, wherein the built emulsifiers comprise 1wt%-3wt% ofcationic emulsifiers and 0.5wt%-1.5wt% of non-ionic emulsifiers. The invention further provides a preparation method of the emulsified asphalt. According to the emulsified asphalt, as the built emulsifiers are added, the emulsified asphalt has superior storage stability, and the performance of the emulsified asphalt meets PC-2 type emulsified asphalt standard requirements in JTG-F40-2004 highway asphalt pavement construction technical specifications.

The invention discloses an aluminum base gelling and curing agent, which comprises calcium aluminate, sulfur aluminum cement and an early-strengthening coagulant aid, wherein the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5. The invention also discloses a preparation method of the above aluminum base gelling and curing agent. According to the method, the calcium aluminate, the sulfur aluminum cement and the early-strengthening coagulant aid, in the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5, are ground, sieved, mixed and stacked up in a cone shape. After that, samples are pressed flat, and peripheral samples are stacked up centrad again in a cone shape and then pressed flat. So repeatedly for several times, and then the aluminum base gelling and curing agent can be obtained. The invention also discloses a method for treating the dredged sediment by means of the above aluminum base gelling and curing agent. Waste and gravels in the mud of the dredged sediment are separated, and then the cationic-type polyacrylamide is added to thicken and dehydrate the dredged sewage. After that, the aluminum base gelling and curing agent is added and mixed with the dredged sewage, and the mixture is stirred. Meanwhile, a water reducer is added and mixed uniformly with the above mixture. After the dehydration and solidification process, the obtained product is subjected to stabilization maintenance. The aluminum base gelling and curing agent is higher in economic, social and environmental benefits.

The invention provides a preparation method of carbon-calcium aluminate composite powder. By the method, aluminium oxide is adopted as raw material, and organic acid calcium is adopted as raw material, in non-oxidizing atmosphere, carbon-calcium aluminate composite powder is obtained by high temperature sintering. The organic acid calcium has two effects, organic acid acts as a calcium source and a carbon source, by taking advantage of this characteristic, in high temperature non-oxidizing atmosphere, sintering is conducted on organic acid calcium and aluminum oxide, pyrolysis is conducted on organic acid calcium, carbon is reduced, new generated calcium oxide and aluminium oxide in the raw materials react to form a calcium aluminate, carbon/calcium aluminium powder is synthesized in one step by utilizing this characteristic. The method has the characteristic of in-situ synthesis, and carbon source is added by means of chemical reactions, carbon source after the chemical reactions gets into composite materials, the dispersity of carbon is greatly increased, far superior to the dispersity of the carbon added by means of physical penetration in the prior art.

The invention relates to anti-collapsible injectable magnesium phosphate-based bone cement. The anti-collapsible injectable magnesium phosphate-based bone cement is composed of a powder phase and a liquid phase, and the powder phase comprises magnesium oxide, potassium dihydrogen phosphate, calcium phosphate salt, citric acid (or sodium citrate) and polysaccharide (or a polysaccharide derivative),wherein the magnesium oxide is 26-28 parts by mass, the potassium dihydrogen phosphate is 52 to 55 parts by mass, the calcium phosphate salt is 16 to 18 parts by mass, the citric acid (or sodium citrate) is 0 to 4 parts by mass, and the polysaccharide (or polysaccharide derivative) is 0 to 1 part by mass. The liquid phase is an aqueous solution of glycerin. The powder phase and the liquid phase are uniformly mixed at a ratio of 1.8 to 2.4 g/mL, a mixture is conditioned for 4 to 6 minutes to form viscous slurry, and the mixture can be injected by a syringe. The injectable magnesium phosphate-based bone cement has good anti-collapsing performance, suitable coagulation time and high strength, is degradable, has good cell compatibility, and is suitable for injection filling of orthopedic anddental cavity defects in ordinary or minimally invasive surgery.

The invention relates to a steatite ceramic compound grinding aid which is compounded by two or more raw materials in parts by weight: 5-20 parts of vinyl bistearamide, 3-15 parts of triethyl hexyl phosphate, 5-20 parts of polyethylene glycol aliphatic ester, 10-30 parts of polyethylene glycol, 15-25 parts of polyethyleneimine, 20-40 parts of sodium metasilicate, 20-40 parts of sodium tripolyphosphate, 10-25 parts of sodium dodecyl benzene sulfonate, 15-30 parts of sodium hexametaphosphate, 10-20 parts of triethanolamine, 10-20 parts of triisopropanolamine and the like. Without affecting a binder polyvinyl alcohol in preparation of the steatite ceramic pug, the product has a good grind-adding effect to the steatite ceramic pug, and the grinding time can be shortened from original 24-28 hours to at least 15-18 hours.

The invention discloses a high-temperature-resistant salt-resistant copolymer-type water-based drilling fluid loss reducing agent as well as a preparation method and an application thereof. The preparation method comprises the following steps: (1) dissolving a polymeric monomer in water, and adjusting the pH value to 5-8; (2) adding an initiator into the solution, and performing a reaction for 2-5hours at the temperature of 60-80 DEG C under mechanical stirring; and (3) carrying out freeze drying on a thick polymer aqueous solution after the reaction is finished, and crushing the reaction product to obtain the solid water-based drilling fluid loss reducing agent. The preparation process is simple, low in cost and wide in application range, and can ensure that water-based drilling fluid has good filtration performance under high temperature, high pressure and hypersalinity.

The invention relates to an in-situ polymerization method modified anion exchange resin as well as a preparation method and application thereof. The modified anion exchange resin is prepared by usingan anion exchange resin with a tertiary amine group [-N(CH3)2] as an organic framework, epoxy chloropropane and dimethylamine as a modifier and ethylenediamine as a cross-linking agent through modification. According to the modified anion exchange resin provided by the invention, the content of amino is increased, weak alkali groups are also increased, the Zeta potential of the modified anion exchange resin is also remarkably increased, and in addition, the isoelectric point of the modified anion exchange resin is 6.62 which is far greater than that of an unmodified resin material, so that theadsorption treatment function on Cr(VI) is greatly improved, and the modified anion exchange resin has the advantages of being stable in quality, excellent in adsorption property, low in cost, simplein solid-liquid separation, large in mechanical strength, high in adsorption capacity, good in regeneration effect, free of secondary pollution, and the like.

An embodiment of the invention discloses a cleaning and finishing agent and an application method thereof. The cleaning and finishing agent comprises sodium gluconate, ammonium chloride, polyethylenepolyamine, lower alcohol, a non-ionic surfactant, an anionic surfactant and deionized water. Compared with a cleaning and finishing agent in the prior art, the cleaning and finishing agent has the advantages that the sodium gluconate, ammonium chloride, polyethylene playamine, lower alcohol, non-ionic surfactant, anionic surfactant and deionized water are used to treat the surface of a pore ring of a PCB board, and glass fiber exposed in the surface of the pore ring is cleaned through sodium gluconate and ammonium chloride; the surface of pore ring resin can be treated by polyethylene polyamine; pore walls can be wetted through the lower alcohol and non-ionic surfactant; the resin and glass fiber on the pore ring surface can be modified through the anionic surfactant to enable the surfaceof the pore ring to form high Zeta potential, effective adsorption capacity of a palladium activator is increased, backlight of electroless copper plating is improved, and the situation of hole-without-copper is reduced.

The invention discloses an organic-inorganic nanoparticle composite water repellent agent, a preparation method and an application method thereof, and belongs to the field of environment-friendly textiles. According to the preparation method, tertiary amine polymer brush grafted nano silicon dioxide is subjected to amination with halogenated hydrocarbon containing a double-bond structure, and thenpolymerized with an acrylate monomer to prepare the organic-inorganic nanoparticle composite water repellent, wherein the obtained composite water repellent agent has good water dispersibility and high surface positive charge density, and does not influence the stability of cationic emulsion. In order to prevent the too thick water-repellent film from hindering the formation of bulges, a thin hydrophobic layer needs to be built, inorganic nano silicon dioxide particles after fabric treatment can be adsorbed on the surface of cotton fibers along with cationic latex particles by controlling theuse amounts of organic components and inorganic components in the water repellent, and projections are provided during organic matter film formation, so that the roughness of the surface of the cotton is increased, the hydrophobic property of the water repellent is improved, the use amount of the water repellent is reduced to a certain extent, and environmental pollution is reduced.

The invention provides a polypeptide monolayer film with high surface potential and hydrophobicity as well as preparation and application thereof. The polypeptide is composed of polypeptide moleculeswith a molecular weight of (1.48+/-0.2) x 10<5> g/mol, the thickness of the monolayer film is 17.3-18.5 nm, the exposure amount of primary amino groups on the surface of the film is 11-11.8%, and theZeta potential of the polypeptide monolayer film is -3 mV to -2 mV. The contact angle of the film is 84+/-1 degrees. The surface of the polypeptide monolayer film has a micro-nano structure, so that the film has a certain hydrophobic property, and biological bionic skin surface waterproofing is facilitated. The surface of the polypeptide monolayer film has higher potential, so that the biocompatibility, the blood compatibility and the adhesion, proliferation and differentiation capabilities of cells can be improved.

The invention relates to a method for prolonging the service life of an A-plane sapphire window polishing fluid. The method comprises the following processes: 1), during chemical and mechanical polishing of an A-plane sapphire, taking the A-plane sapphire window polishing fluid, and measuring the potential by using a Zeta potential analyzer to monitor the change condition of the Zeta potential ofthe A-plane sapphire window polishing fluid; 2), when the absolute value of the Zeta potential of the A-plane sapphire window polishing fluid is monitored to be not higher than 18 mv, directly addinga non-ionic surfactant into the A-plane sapphire window polishing fluid in use, when the absolute value of the Zeta potential of the A-plane sapphire window polishing fluid is not lower than 25.0 mv,stopping adding, then monitoring the Zeta potential once every 0.5-1.5 hours, and repeating the process, wherein the non-ionic surfactant is one or a mixture of several of fatty acid methyl ester ethoxylate, dodecyl polyethylene glycol carboxylate and fatty alcohol polyoxyethylene ether which can increase the Zeta potential of the polishing fluid and do not adversely react with the polishing fluidafter addition.

The invention discloses a dispersing agent and a method for improving the magnetic performance of a bonded permanent magnetic ferrite material, the combined action of sodium polyacrylate and calcium gluconate is beneficial to promoting dispersion of ferrite particles and preventing particle aggregation, the aqueous solution of sodium polyacrylate is alkaline, and the hydrolysis of the dispersing agent is prevented by adjusting the pH value of the solution, the Zeta potential between the powder is improved, and due to the improvement of the Zeta potential, stronger electrostatic repulsive force can be obtained between particles, the dispersity of the magnetic powder particles is improved, the orientation degree of the permanent magnetic ferrite and the stability of slurry are improved, so that the purpose of improving the magnetic performance of the bonded permanent magnetic ferrite is achieved; the magnetic performance of the bonded permanent magnetic ferrite prepared by the method is obviously improved, and compared with the addition or single addition of a dispersant under the condition of an alkaline or weakly alkaline grinding medium, the addition of the combined dispersant into the alkaline grinding medium can obviously improve the magnetic performance of the permanent magnetic ferrite.