95results about How to "Good pH responsiveness" patented technology

The preparation process of semi-interpenetration network hydrogel with quick temperature response includes the following steps: dissolving the monomer and cross-linking agent in deionized water; adding polyeleectrolyte, electrolyte and initiator through stirring under inertial atmosphere for 5-10 min, reaction at 0-30 deg.c for 2-48 hr, and collecting semi-interpenetration network hydrogel with quick temperature response. The hydrogel has not only quick temperature response, but also great gel strength, and its response speed may be regulated via altering the consumption and molecular weight of the polyeleectrolyte and salt concentration in the reaction liquid. The hydrogel has 90 sec dehydration rate over 95 % at the temperature over its phase conversion point, can reach dehydration balance in 2 min, and has good pH response and thus expanded application range, especially in biological and medicine fields.

The invention belongs to the field of preparation of intelligent corrosion inhibitors, and particularly relates to a preparation method of a pH-controlled-release long-acting intelligent corrosion inhibitor. A using method of the conventional corrosion inhibitor is realized mainly through one-time addition or continuous addition for multiple times, and the concentration of the corrosion inhibitor in an early period is too high, while the concentration of the corrosion inhibitor in a late period is too low, therefore, resource waste is caused, the slow release efficiency is reduced, and even sometimes, the corrosion rate is accelerated, as a result, the invention prepares the pH-controlled-release long-acting intelligent corrosion inhibitor which is a hydrogel-embedded corrosion inhibitor, is sensitive to ambient pH and has a corrosion inhibiting function; and the intelligent corrosion inhibitor can determine the release condition according to different properties of an ambient medium.

The invention discloses a preparation method and application of pH-responsive amino sodium lignosulphonate. The preparation method comprises the following steps: dissolving sodium lignosulphonate in water to prepare a sodium lignosulphonate water solution, regulating the pH of the solution to be 10-13, and activating at 50-70 DEG C for 0.5-1.0 hour; adding an amination modifier, dropwise adding an aldehyde reagent, and reacting at 70-90 DEG C for 2-4 hours after the dropwise adding, so as to obtain an amino sodium lignosulphonate water solution; extracting the obtained amino sodium lignosulphonate water solution by virtue of an alcohol reagent, washing residual solids by virtue of petroleum ether after the extraction, and carrying out freeze drying on washed remnants. The amino sodium lignosulphonate prepared by virtue of the preparation method has remarkable pH response characteristic; by regulating the pH of the water solution of the product, the molecular configuration and the aggregation extent of the product can be changed, and a regular nanoparticle structure can be spontaneously formed; the amino sodium lignosulphonate can be used as a wall material to be applied field of pesticide microcapsules and is hopefully applied to the field of lignin-based nanometer materials.

The invention provides a gel-based pH sensor and a preparation method thereof, belonging to the technical field of intelligent high molecules and sensors. The pH sensor is a composite material which takes polyvinyl alcohol gel as a matrix, and immobilizes and buries poly(acrylamide / methylacrylic acid) gel microspheres and immobilizes Congo red. The preparation method comprises the following steps: preparing a poly(acrylamide / methylacrylic acid) gel microsphere suspension; adding the microsphere suspension to polyvinyl alcohol aqueous liquor to crosslink and gelatinize; soaking a gel film in the Congo red for soaking, alkali treatment and washing to obtain a product. The gel-based pH sensor provided by the invention has the characteristics of absorbancy response and color response, so that visual simple measurement and precise measurement of pH value can be realized, and the using agility and application field of the pH gel sensor can be remarkably improved.

The invention provides a preparation method and application of a pH sensitive type magnetic demulsifier with surface charges and hydrophilic-hydrophobic properties controlled. Based on magnetic Fe3O4 nanoparticles, through surface modification with silicon dioxide and a grafting copolymerization reaction, surface active monomers and pH sensitive monomer copolymer chains are introduced on the surfaces of the nanoparticles, and the surface grafting structure and the pH value are further adjusted to control the surface charges and hydrophilic-hydrophobic properties of the magnetic nanoparticles. The reduction of the pH value can enhance the hydrophobic property of the magnetic nanoparticles and reduce negative charge repulsive interaction between the demulsifier and oil droplets so that the demulsifier can be absorbed onto the surfaces of the emulsified oil droplets and quickly isolate the emulsified oil droplets under the action of an external magnetic field. Recycling of the magnetic nanoparticles can be achieved, and the demulsifier is be unlikely to be affected by pollution of negative-ion surface active materials in emulsified oil wastewater. According to the magnetic demulsifier, the preparation method is simple, the recycling process is convenient and efficient, the recycling performance is excellent, and therefore the magnetic demulsifier has very board application prospects in the fields of emulsified oil wastewater treatment and oil-water separation.

The invention provides a double-responsiveness glucan-polyamino acid block copolymer which adopts the structure shown in formula (I), can be self-assembled into a micelle in a water environment and is used for loading a hydrophobic antitumor drug. Compared with the prior art, the double-responsiveness glucan-polyamino acid block copolymer has the advantages that hydrophilic-chain glucan and hydrophobic-chain polyamino acid are connected through an oxime bond and a disulfide bond, so that the double-responsiveness glucan-polyamino acid block copolymer has the good pH responsiveness as well as the good reduction responsiveness, the prepared drug-loaded micelle can quickly release the drug in tumor tissue or cells, under low-pH-value environments or high-GSH (glutathione)-concentration environments, the efficacy is enhanced, and the toxicity is reduced.

The invention provides a conductive photo-thermal self-healing composite hydrogel dressing as well as a preparation method and application thereof.The preparation method comprises the following steps:grafting acrylic acid on chitosan to obtain an N-carboxyethyl chitosan polymer; the preparation method comprises the following steps: grafting p-hydroxybenzaldehyde on a triblock copolymer to obtainan aldehyde-terminated polymer (PF127-CHO); the preparation method comprises the following steps: preparing an aldehyde-terminated polymer into a solution, adding carbon nanotubes into the polymer solution, and carrying out ultrasonic treatment in an ice bath to obtain an aldehyde-terminated / carbon nanotube dispersion liquid; the preparation method comprises the following steps: preparing an N-carboxyethyl chitosan polymer into a solution, mixing the solution with an aldehyde group-terminated / carbon nanotube dispersion liquid, and carrying out mutual crosslinking at 20-45 DEG C for 5-400 seconds to obtain the conductive, adhesive, self-healing, photo-thermal and nano composite hydrogel. The hydrogel has excellent adhesion, self-healing, pH response, biocompatibility and hemostatic performance, can show a photo-thermal behavior after being exposed to a near-infrared (NIR) region, causes physical damage to bacteria, and has huge potential for treating infected wounds.

The invention discloses a preparation method of a pH-responsive graphene / polymer nanometer hybrid material. The preparation method comprises the following steps: under the protection of inert gas of argon or nitrogen, carrying out an esterification reaction by using a reversible addition-breakage chain transfer polymerization chain transfer agent of hydroxyl and terminal carboxyl on the surface of graphene oxide to obtain a macromolecular chain transfer agent for reversible addition-breakage chain transfer polymerization; and then, carrying out reversible addition-breakage chain transfer polymerization under initiation of azodiisobutyronitrile to obtain the pH-responsive grapheme / polymethylacrylic acid-N,N-lignocaine ethyl ester nanometer hybrid material. The graphene oxide / polymer nanometer hybrid material not only ensures that the dispersibility of graphene in water is greatly improved but also has pH responsiveness, and can be widely applied to the fields of drug controlled release carriers, biosensors, intelligent nanometer materials and the like. The preparation method is simple and easy, and industrial production of materials can be realized, so that the method has good popularization and application values.

The invention discloses a metal polyphenol collagen membrane material as well as a preparation method and application thereof. The metal polyphenol collagen membrane material is a hydrogel material and comprises collagen and a nano complex loaded on a porous structure of the collagen, and the nano complex is obtained by chelating metal ions and polyphenol. The metal polyphenol collagen membrane material has good pH responsiveness, has antibacterial and hemostatic effects at the same time under response conditions, has an excellent skin wound repairing effect, and can be applied to skin wound repairing materials.

The invention discloses a preparation method of pH responsive cation nanogel. The preparation method comprises the following steps: lauryl sodium sulfate and polyethylene glycol dimethyl acrylic ester are sufficiently dissolved in water to prepare a water-phase solution, ethylene glycol dimethacrylate and cationic monomer methylacrylic acid-(N, N-diethyl amine) ethyl ester or 2-(diisopropyl amino) ethyl methacrylate are uniformly mixed to obtain a mixture, and then the mixture is added into the water-phase solution to prepare microemulsion, and a water solution with an initiator is added in the microemulsion to react for 20-24 h to obtain the pH responsive cation nanogel dispersion liquid. The nanogel prepared has good pH responsiveness and dispersion stability, can be placed stably for more than 3 months, and the number-average grain size of the nanogel is smaller than 100 nm.

The invention discloses an amphiphilic waterborne segmented copolymer medicament carrier with pH responsiveness and biodegradability and a preparation method thereof. An amphiphilic waterborne segmented copolymer consists of a chain segment which is modified with polyphosphoester and polymethacrylate hydroxyethyl and contains carboxyl. A polyanion chain segment can be reversely converted into a hydrophilic or hydrophobic chain segment by adjusting the pH value of a medium. The amphiphilic polymer is self-assembled into a micelle under the condition of certain PH, and a shell of the micelle formed by a hydrophilic polyphosphoester chain segment can be used for better stabilizing the micelle. A hydrophobic polyanionic chain segment is used for forming an inner core of the micelle, is used for coating a hydrophobic medicament, and serves as a medicament carrier. The polyphosphoester chain segment has high biocompatibility and high biodegradability, and long in-vivo circulation of a medicament-carrying micelle can be realized. Under a weakly alkaline condition, the aims of dissociating the micelle, releasing a medicament and realizing controllable release are fulfilled.

The invention discloses a graphene oxide composite membrane with pH responsiveness and a preparation method and application thereof. A graphene oxide sheet layer is crosslinked into a graphene networkthrough polycation electrolyte, and is uniformly spread on the surface of a matrix membrane, so that the morphology and performance of the graphene oxide composite membrane are adjusted. The membranehas high chemical stability and also has high permeability and filtration performance. The graphene oxide composite membrane has excellent pH response performance, and the thickness, surface hydrophilicity and hydrophobicity and pore diameter of the graphene oxide composite membrane are adjusted along with the regulation and control of external pH. According to the characteristics, the pH-responsive graphene oxide composite membrane can show selectivity to different pollutants under different pH conditions, can achieve separation and recovery of pollutants with different components, and can achieve a plurality of continuous filtration cycles. The pH-responsive graphene oxide composite membrane has extremely high stability, excellent pH responsiveness and recycling performance, and can beused in the fields of actual water body pollutant removal, multi-component pollutant separation and the like.

The invention relates to a fertilizer synergist, and in particular relates to a poly(polyphenol) coated nitrification inhibitor as well as a preparation method and application thereof. The poly(polyphenol) coated nitrification inhibitor comprises a nitrification inhibitor and poly(polyphenol) coating the nitrification inhibitor. The preparation method is that a polyphenol compound is subjected toa polymerization reaction on the surface of the nitrification inhibitor. The poly(polyphenol) coating material is resistant to water washing, has good pH responsiveness, is biodegradable, and has lessinfluence on the denitrification effect of the nitrification inhibitor. The coated structure enables the nitrification inhibitor to be resistant to water washing and deliquescence, and have a bettereffect on inhibition of the nitrification effect of nitrogen fertilizers. In addition, the coated structure enables the slow release effect of the nitrification inhibitor to be obvious.

The invention belongs to the technical field of preparation of detection materials, and relates to a preparation method of a magnetic ferroferric oxide nanosphere-based novel pH-responsive imprinted material. The preparation method comprises the following steps: firstly preparing ferroferric oxide nanoparticles and synthesizing mesoporous silicon dioxide coated ferroferric oxide nanospheres, and then performing chemical double bond modification on the mesoporous silicon dioxide coated ferroferric oxide nanospheres; finally, preparing the magnetic nanosphere-based pH-responsive imprinted material. The pH-responsive imprinted material prepared according to the preparation method provided by the invention can solve the problem that the surface of a base material is difficult to be directly coated with a molecularly imprinted polymer layer; the imprinted material adopts a significant core-shell structure consistent with the purpose of the invention; in addition, through combination of theperformance of the molecularly imprinted material and a pH-responsive intelligent material, the pH-responsive imprinted material is successfully applied to efficient detection of sulfamethoxazole.

The invention discloses a preparation method of an amphiphilic triblock copolymer modified ultrafiltration membrane with pH-responsive property. The method comprises the following steps: taking methylmethacrylate (MMA) and acrylic acid (AA) as raw materials, and preparing PAA-b-PMMA-b-PAA (PAMA) with a controllable structure by adopting reversible addition-fragmentation chain transfer (RAFT) polymerization. The amphiphilic triblock copolymer modified ultrafiltration membrane is directly prepared by adopting immersion precipitation phase inversion. According to a segregation behavior of the modifier on the membrane surface, the ultrafiltration membrane has a certain hydrophilic property and pollution resistance. The PMMA chain segments in the modifier PAMA adopted in the invention and polyvinylidene fluoride have excellent compatibility, and the membrane is kept stable in the application process. The PAA serving as a hydrophilic segment is enriched on the membrane surface and membranepores, the hydrophilic property of the membrane is improved, and adhesion of pollutants on the membrane surface and membrane pores is avoided. In addition, the ultrafiltration membrane has high anti-pollution capacity and retention rate of proteins and exists effective aperture conversion at the pH value of 3-8, and effective pore size regulation under external environmental stimulation is realized.

The invention relates to a cell membrane coated ultra-small ferroferric oxide nanocluster, and a preparation method and an application thereof. The method comprises the following steps: preparation ofultra-small ferroferric oxide nanoparticles, preparation of surface aminated ultra-small ferroferric oxide nanoparticles, preparation of ferroferric oxide nanoclusters, preparation of adriamycin-loaded ferroferric oxide nanoclusters, preparation of a cell suspension, and preparation of cell membrane coated ultra-small ferroferric oxide nanoclusters. After the nanocluster provided by the inventionis injected into a mouse body through a tail vein, T1 / T2 bimodal MR imaging conversion can be achieved; meanwhile, the anti-tumor effect can be exerted; the chemotherapy effect of the nanocluster canbe further enhanced through a UTMD auxiliary means; and the nanocluster has potential clinical application value.

The invention relates to an electrical stimulation and pH dual response antibacterial injectable hydrogel and a preparation method and application thereof, first, a chitosan-polyaniline copolymer is prepared by grafting polyaniline onto chitosan; the chitosan-polyaniline copolymer is prepared into a solution, and the solution is mixed with an oxidized dextran solution for crosslinking at 25-40 DEGC for 30-800 seconds to get the electrical stimulation and pH dual response antibacterial injectable hydrogel; the mass ratio of chitosan-polyaniline copolymer and oxidized dextran is (1-5): (1-8). The CP / OD hydrogel has dual response to electrical stimulation and pH, meets the demand for specific time administration and has excellent antibacterial properties.

The invention belongs to the technical field of biomedical functional material preparation, and relates to a preparation method of a dynamic pH response chain based on a boric acid type metal organiccomplex. Therefore, a boronate ligand is introduced by utilizing the metal organic complex, then an anti-cancer drug doxorubicin (DOX) is loaded on through the porous structure of the metal organic complex, and hydrophilic biologic chain (PEG-NHS-PDA) is attached to serve as the dynamic response chain to achieve the purpose of sustained releasing and preventing the anti-cancer drug from releasingat will. Finally sialic acid on the surfaces of cancer cells is identified through the metal organic complex, and growing of the cancer cells is inhibited through a thermal therapy effect.

The invention provides a polyether sulfone (PES) grafted acrylic monomer copolymer and a preparation method thereof. The method comprises the following steps: under anaerobic conditions, polyether sulfone and an acrylic monomer are subjected to a direct radiation grafting reaction in a homogeneous solution containing the polyether sulfone and the acrylic monomer, and therefore the grafted copolymer is obtained, wherein the solvent of the homogeneous solution is one or more selected from N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide and dimethyl sulfoxide. The grafting ratioof the grafted copolymer provided by the invention is moderate, and the polyacrylic monomer can form a grafted-copolymer molecular structure with ''a multiple-point short chain'' on the polyether sulfone molecules, so that the polarity of the grafted copolymer and the flexibility of the molecular chain are effectively improved; the grafted copolymer is not easy to crosslink, so that the hydrophilic properties of the polyether sulfone can be obviously improved; the grafted copolymer has good solubility; and the grafted copolymer has very good pH response, temperature response, anti-pollution performance and charge effects, and has broader applicability.

The invention discloses a fenton reagent and adriamycin co-transport targeting nanocarrier and a preparation method thereof. The method includes the steps of preparing CA-OH and Fc-OH, preparing CA-SA-COOH and Fc-SA-COOH, preparing FA-PEG-COOH, preparing CA and Fc-g-Pullulan, preparing CA, Fc and FA-g-Pullulan, and preparing DOX-loaded CFFP NPs. According to the preparation method, a hydrophobic chain segment containing a fenton reagent and a hydrophilic folic acid chain segment modified pullulan grafted copolymer with a targeting function are used for self-assembling and wrapping the anti-tumor treatment drug adriamycin, and the fenton reagent and adriamycin co-transport targeting nanocarrier is prepared. The nanocarrier and the preparation method eliminate the limitation in the aspects of the targeting property of an active oxygen generator and single active oxygen efficient treatment in the prior art.

The invention belongs to the field of high-molecular polymer hydrogel, and relates to a preparation method of a pH response type carboxymethyl chitosan / sodium alginate hydrogel ball. The preparation method of the hydrogel ball comprises the following steps: respectively dissolving carboxymethyl chitosan and sodium alginate in water under stirring at room temperature, carrying out filtering to remove insoluble substances, and performing ultrasonic degassing to respectively obtain transparent carboxymethyl chitosan and sodium alginate solutions; adding a certain amount of the carboxymethyl chitosan solution into the sodium alginate solution, carrying out quick stirring to form a uniform solution, and conducting degassing; and dropwise adding a mixed solution obtained in the previous step into a cross-linking agent by using a disposable syringe with a volume of 1 mL, conducting curing, taking out the hydrogel ball, and washing the hydrogel ball with water. According to the invention, release of protein in simulated gastric juice can be effectively reduced; a preparation process is simple, safe and non-toxic; raw materials are low in price; the hydrogel ball is stable in structure and good in pH response characteristics, and wide application prospects are achieved in the aspect of oral protein and water-soluble drug delivery.

The invention relates to a pH (Potential of Hydrogen) responsive fluorescent carbon nanoparticle hybrid microgel and a preparation method thereof. The preparation method comprises the following steps: (1) weighing fluorescent carbon nanoparticles, using methylene dichloride to dissolve and prepare a fluorescent carbon nanoparticle solution, adding acyl chloride monomers, reacting for 10 h under room temperature, removing a reaction solvent, adding water, and drying through rotation; (2) weighing to obtain double-bonded fluorescent carbon nanoparticles, adding the double-bonded fluorescent carbon nanoparticles into distilled water, transferring the liquid into a reaction container, adding a cross-linking agent, sodium dodecyl sulfate and pH responsive polymer monomers after exhausting air, introducing nitrogen gas to exhaust the air, heating, and adding an initiating agent into a three-opening bottle after reaction liquid begins to backflow; (3) continuously introducing nitrogen gas and stirring, and carrying out a backflow reaction for 5-20 h at 50-90 DEG C; (4) filtering after cooling to room temperature, taking filter liquor, and placing the filter liquor in a dialysis bag for dialyzing for 48 h. The obtained product is free of biological toxicity, the grain diameter of the product is about 760 nm, fluorescent light has good pH responsiveness under the excitation of the same wavelength, and the product has a good application in the fields of drug release, pH sensing and catalysis.

The invention discloses a conductive collagen heart patch preparation method. The preparation method comprises the steps of preparing carbon nano tube dispersion liquid, crosslinking collagen and preparing a final patch. The method is simple and effective; the prepared conductive collagent heart patch has high mechanical property and strong electron conductivity and further has good biocompatibility, safety and easiness in biodegradation; the limitation that an ordinary heart patching material has poor toughness and electron conductivity and the like in a use process is solved; the conductivecollagen heart patch has a wide application prospect in the field of biological medical materials of tissue engineering and the like.

The invention discloses high-strength responsive hydrogel based on a block copolymer and a preparation method thereof, and belongs to the technical field of preparation of materials. A reactive amphiphilic triblock copolymer capable of self-assembling in water to form micelles is subjected as an intra-system macromolecular crosslinking point instead of the traditional crosslinker N,N-methylene diacrylamide to free radical polymerization with a monomer so as to obtain high-strength hydrogel having uniform crosslinking density. The reactive amphiphilic triblock copolymer is not electrically charged; the size and stability of the reactive amphiphilic triblock copolymer are scarcely influenced by ion strength or charge in a solution; therefore, the reactive amphiphilic triblock copolymer is applicable to most free radical polymerized monomers, and synthesis of intelligent functional hydrogel is facilitated. The preparation method herein is simple to perform; preparing is easy; the raw materials are good in safety and stability and are easy to store; the preparation process is green and safe, has short time and low byproduct production; a means is provided to prepare multifunctional high-strength hydrogel. The prepared hydrogel has excellent pH response and mechanical properties.

The invention discloses an injectable hydrogel dressing with pH response as well as a preparation method and application thereof. A polymer monomer and a tissue cross-linking agent monomer are subjected to free radical polymerization reaction to prepare the injectable hydrogel dressing with pH response. A double-bonded amino acid or a double-bonded amino acid derivative is subjected to an esterification reaction with -OH on NHS (N-hydroxysuccinimide) through -COOH of the double-bonded amino acid or the double-bonded amino acid derivative, and the tissue cross-linking agent monomer is prepared.The preparation method is simple to operate; the used raw materials are easy to obtain and low in price; and meanwhile, the prepared hydrogel dressing has good adhesiveness, pH responsiveness, injectability, self-healing performance and hemostatic performance, can effectively promote stomach hemostasis and wound healing after endoscopic therapy, and has huge application value in the fields of stomach hemostasis and wound healing.

The invention discloses an icariin controlled release microsphere, a preparation method thereof and application thereof. The controlled release microsphere is used for pH response controlled release microsphere for treating colon disease, high-molecular polymers including chitosan, sodium alginate and like are used as carrier materials, the icariin is used as the active ingredient to construct an oral colon specific drug delivery system with biological controlled release targeting ability. The biological controlled release targeting microsphere disclosed by the invention has good pH responsiveness, the drug release amount under stomach low pH environment is low, the drug release can be promoted under the colon high pH environment, and the colon residence time of the drug is prolonged; the drug absorption is increased, and the local bioavailability of the oral drug for treating the colon disease is improved.

The invention discloses a method for preparing double-stimulation responsive surface through secondary photopolymerization, relating to the field of grafting and modification of various base material surfaces. The method comprises the following steps: I, grafting pH responsive compound onto the surface by adopting a cracking type photoinitiator, wherein the pH responsive compound grafted onto the surface can be used as a hydrogen donor and a co-initiator of the next step reaction; and II, performing photopolymerization reaction on the basis by adopting a hydrogen abstracting type initiator, and grafting the double bond-modified photoresponse compound. The method not only has the advantage that the photopolymerization is efficient, energy-saving, economical, environment-friendly, and the like, but also the compound is difficult to drop after being grafted onto the surface through a covalent bond manner. The prepared intelligent surface has good photoresponsiveness, pH responsiveness, and the swelling property and wettability of the surface polymer can be reversibly controlled. The surface has potential application on the aspects of surface molecule switches, surface controlled release and ion adsorption due to good controllable wettability and mechanical effect.

The invention relates to a fibronectin-coated tannic acid / iron complex drug-loaded nano material and a preparation method and application thereof. The method comprises the following steps: adding doxorubicin hydrochloride into triethylamine for deprotonation, mixing an obtained hydrophobic doxorubicin solution and a tannic acid solution, adding iron salt for reaction, and mixing, stirring and extruding an obtained drug-loaded nano material of the tannic acid / iron complex loaded with doxorubicin and a fibronectin solution. The drug-loaded nano material prepared by the method not only can realize T1MR imaging, but also can play an anti-tumor immune effect through immunogenic death caused by chemotherapy and ferroptosis, and has potential clinical application value.

The invention provides a preparation method and application of a pH sensitive type magnetic demulsifier with surface charges and hydrophilic-hydrophobic properties controlled. Based on magnetic Fe3O4 nanoparticles, through surface modification with silicon dioxide and a grafting copolymerization reaction, surface active monomers and pH sensitive monomer copolymer chains are introduced on the surfaces of the nanoparticles, and the surface grafting structure and the pH value are further adjusted to control the surface charges and hydrophilic-hydrophobic properties of the magnetic nanoparticles. The reduction of the pH value can enhance the hydrophobic property of the magnetic nanoparticles and reduce negative charge repulsive interaction between the demulsifier and oil droplets so that the demulsifier can be absorbed onto the surfaces of the emulsified oil droplets and quickly isolate the emulsified oil droplets under the action of an external magnetic field. Recycling of the magnetic nanoparticles can be achieved, and the demulsifier is be unlikely to be affected by pollution of negative-ion surface active materials in emulsified oil wastewater. According to the magnetic demulsifier, the preparation method is simple, the recycling process is convenient and efficient, the recycling performance is excellent, and therefore the magnetic demulsifier has very board application prospects in the fields of emulsified oil wastewater treatment and oil-water separation.

The invention relates to a preparation method of durable pH-responsive intelligent super-infiltrated fabric with a self-repairing performance. The method comprises the steps of mixing perfluorooctanoic acid (PFOA) with butyl titanate, and adding water and ethanol to obtain a PFOA / butyl titanate solution; adding anatase type TiO2 into anhydrous ethanol, and adding perfluorooctyl trichlorosilane (PFOTS) to obtain mixed liquid; then, soaking hydroxylated fabric into the mixed liquid, stirring evenly, and adding the PFOA / butyl titanate solution, and stirring evenly; drying. The preparation methodis simple in preparation process, mild in reaction conditions and easy to implement, and does not need harsh reaction conditions and complex reaction equipment. The porous fabric is higher in porosityand larger in specific surface area; by taking the porous fabric as a substrate, modifying the PFOA and PFOTS compounds with low surface energy and establishing micro-nano roughness based on TiO2 particles, the surface energy of the modified fabric is reduced, and the surface roughness of the modified fabric is increased; therefore, the pH-responsive super-hydrophobic material with self-repairingproperty is obtained.