97 results about "Hydrophilization" patented technology

The invention belongs to the technical field of membrane separation, and particularly relates to a low-pressure high-flux polyamide / polysulfone hollow fiber composite nanofiltration membrane and a preparation method thereof. The preparation method of the composite nanofiltration membrane comprises the following steps: dissolving sulfonated polysulfone, poly (1-vinyl-3-butylimidazole) bromide and polyvinylpyrrolidone to prepare a spinning solution, and spinning to obtain a base membrane; carrying out hydrophilic modification on the base membrane by using 1, 3-propane sultone; then, an aqueous phase solution containing poly (gamma-glutamic acid) and triethylene tetramine and an organic phase solution containing trimesoyl chloride and 3, 5-diaminobenzoic acid are subjected to interfacial polymerization in the inner cavity of the modified base membrane to form a polyamide separation layer; and finally, carrying out heat treatment to obtain the composite nanofiltration membrane. Through the synergistic effect of zwitterionic ionization of the base membrane and biomacromolecule construction of the separation layer, the mass transfer resistance of water is remarkably reduced, unification of high flux and high selectivity is achieved, and good structural stability is achieved.

The invention provides a sodium ion specific fluorescence labeled transparent soil sample as well as a preparation method and application thereof, and belongs to the technical field of rock soil and geological engineering. The method comprises the following steps: firstly, sequentially carrying out hydrophilization treatment, solvent evaporation and dissolution on a sodion combined benzofuran isophthalate probe to obtain a probe mother solution; mixing the probe mother solution, a buffer solution, an inorganic sodium salt solution and a solvent to prepare a fluorescence labeling pore solution; and finally, mixing the sodium polyacrylate particles and the fluorescence labeled pore liquid, and performing vacuum saturation treatment to obtain the transparent soil sample. The transparent soil sample provided by the invention still keeps excellent optical transparency while having sodium ion specific response capability, so that a stable and reliable experimental medium is provided for in-situ, real-time and full-field observation of sodium ion migration.

The invention discloses porous carbon with a gradient structure, a preparation method of the porous carbon and application of the porous carbon in a negative electrode of a lithium ion battery. The porous carbon has a gradient structure with compact micropores on the surface and loose macropores inside. The preparation method of the porous carbon comprises the following steps: carrying out oleophylic modification on SiO2 to obtain hydrophobic SiO2; carrying out hydrophilic coating on NH4Cl to obtain PVP (Polyvinyl Pyrrolidone) coated NH4Cl; the preparation method comprises the following steps: mixing coal pitch, methylbenzene, oleic acid, hydrophobic SiO2 and PVP (at) NH4Cl to form a suspension; preparing a spherical precursor by a micro-fluidic emulsification method; and carbonizing, sequentially carrying out oxygen plasma treatment and HF solution etching, and removing the template to obtain the porous carbon with the gradient structure. The gradient distribution of the template and the pore-forming agent is realized through surface modification difference and a microfluidic technology, the pore structure and the particle size can be accurately regulated and controlled, the process is simple, the compatibility is high, the prepared porous carbon can be used as a substrate for a silicon-carbon composite negative electrode material, the volume expansion of silicon can be effectively buffered, and the service life of the silicon-carbon composite negative electrode material is prolonged. And the first coulombic efficiency, the specific capacity and the cycling stability of the lithium ion battery are improved.

The present application relates to a kind of monodisperse core-shell type hybrid silica microspheres containing vinyl shell and its preparation and application. Specifically, using "two-phase method" strategy, monodisperse solid silica microspheres are used as matrix, vinyl triethoxysilane and tetraethyl orthosilicate are used as raw materials, lauryl amide propyl betaine and sodium subtiliporin are used as double-template pore-forming agent, under the catalysis of urea, sol-gel reaction occurs, a layer of porous hybrid shell containing vinyl functional group is constructed on the surface of solid silica microspheres, and core-shell type silica hybrid microspheres are formed. Because the shell contains a large number of vinyl functional groups, after hydrophilic modification with captopril, it is used as the adsorbent of hydrophilic interaction chromatography, and is applied to the selective enrichment of biological samples. The core-shell type silica hybrid microspheres prepared in the present application have uniform morphology, good monodispersity, and rich vinyl functional groups on the surface, which are easy to modify and apply subsequently.

According to one embodiment of the present disclosure, a substrate cleaning apparatus includes a hydrophilization chamber connected to a polishing apparatus and that accommodates a substrate having a polished surface polished by the polishing apparatus; a support provided in the hydrophilization chamber; a liquid supply unit that supplies a cleaning liquid to the polished surface of the substrate to hydrophilize the polished surface; an imaging unit that captures an image of the polished surface supplied with the cleaning liquid; a determination unit that determines whether hydrophilization is achieved on a basis of the image; an adjustment unit that adjusts the supply of the cleaning solution by the liquid supply unit depending on a determination result obtained by the determination unit; and a cleaning chamber connected to the hydrophilization chamber and that cleans the polished surface hydrophilized by the cleaning liquid.

The invention discloses a polyurethane or polyurea aqueous dispersion with high humidity and heat resistance as well as a preparation method and application thereof. The aqueous dispersion is prepared by reacting the following components: a) polyester diol and / or polyol, b) di-and / or polyisocyanate which at least contains more than 50% by mass of toluene diisocynate, c) a monofunctional or polyfunctional polyethoxy chain segment-containing component which is synthesized by taking sodium methoxide as a catalyst and has reaction activity to isocyanate, and d) a polyethoxy chain segment-containing component which has reaction activity to isocyanate. D) a sulfonic acid type hydrophilic compound; e) a low molecular compound containing hydroxyl and containing at least two NCO reactive amino groups; wherein the ratio of the sodium ions in the component c) to the toluene diisocynate in the component b) is 10 ppm to 100 ppm. Sodium ions can catalyze a small amount of isocyanate groups to react with carbamate bonds to generate allophanate bonds in a polyurethane synthesis process, so that a trace cross-linked structure is introduced into a polyurethane chain segment, and the heat resistance / damp heat resistance of a product is improved.

An electrochemical system with an electrochemical stack (1) comprising a first reaction chamber (2) and a second reaction chamber (3), separated by a semipermeable barrier (4), between which an electrical potential difference can be applied. At least one of the reaction chambers (2; 3) is filled with water during operation and connected to a drain line (10) through which water or the aqueous solution can flow out. The inner surface (110) of the drain line (10) is hydrophilized and has a wetting angle (α) of 0° to 90°.

This invention discloses a high-strength, hydrophilic PVDF hollow fiber porous membrane with a through-cell honeycomb structure and its preparation method, belonging to the field of membrane separation technology. The technical solution includes: a) preparing a homogeneous spinning solution composed of a fluoropolymer and a diluent; b) simultaneously extruding the spinning solution and core solution through a spinning device, and then introducing the extruded nascent hollow fiber membrane containing the core solution into an external coagulation bath system to complete phase separation, solidification, and stretching; the core solution and / or the external coagulation bath system in step b is a solution containing a hydrophilic agent. This invention proposes a simple, controllable, and effective method to achieve uniform, durable, and non-damaging hydrophilic modification of the inner and outer surfaces of the fiber while preserving the excellent mechanical properties of the PVDF bulk.

The invention discloses a high-performance waterborne polyurethane primer applied to an optical-grade biaxially oriented polyester film and a preparation method of the high-performance waterborne polyurethane primer, and belongs to the field of waterborne polyurethane primer. The primer is prepared from the following raw materials in parts by weight: 52 to 68 parts of polyester polyol, 4 to 7 parts of sulfonate polyester polyol, 1 to 3 parts of polyether polyol, 1 to 6 parts of carboxylic acid type hydrophilic compound, 16 to 38 parts of isocyanate, 0.1 to 0.5 part of alcohol chain extender, 1 to 5 parts of amine chain extender, 0.02 to 0.06 part of catalyst, 1 to 6 parts of neutralizer, 160 to 280 parts of acetone, 1340 to 1740 parts of deionized water, 0.3 to 2 parts of silane coupling agent, 0.3 to 1 part of defoaming agent, 1 to 5 parts of wetting agent and 260 to 300 parts of isopropanol. And 4-7 parts of a closed curing agent. The primer prepared by the invention has good high-temperature yellowing resistance on an optical-grade biaxially oriented polyester film, is free of stripes after being coated, has the adhesive force of grade 0, and also has the advantages of flame retardance, environment friendliness, no toxicity, low VOC (Volatile Organic Compounds), low odor and the like.

The invention relates to the technical field of quartz glass surface treatment, in particular to a manufacturing method of a quartz glass surface high-temperature-resistant coating with high infrared reflectivity, and the method comprises the following steps: (1) preparing a water-based dispersion liquid: mixing deionized water, ethylene glycol, polyethylene glycol and a water reducing agent; (2) preparing coating slurry: mixing quartz glass micro powder, hydrophilic fumed silica particles, a non-metal sintering aid and a water-based dispersion liquid, and carrying out ball milling treatment; (3) carrying out hydrophilization treatment on the quartz glass substrate; (4) coating of a slurry layer: coating the slurry obtained in the step (2) on the surface of the quartz glass substrate treated in the step (3); and (5) sintering the slurry layer: performing high-temperature heat treatment on the quartz glass treated in the step (4) to form the high-temperature-resistant coating. According to the preparation method, the high-temperature-resistant coating with the infrared relative reflectivity of 90% or above can be prepared, and the heating performance and the temperature uniformity of the quartz glass-based reaction cavity are effectively improved.

The present application relates to a fiber with hydrophilic and hydrophobic alternating structure, a preparation method thereof and a fog water capturing application, the fiber is a skin-core structure with a static water absorption layer coated on a cellulose fiber, and the outer surface of the static water absorption layer has hydrophilic regions and hydrophobic regions arranged alternately along the fiber axis. The preparation method comprises: coating a modifiable polymer layer on the surface of the cellulose fiber by a solution immersion method, then performing heat stretching treatment to obtain a skin-core structure fiber; performing polarity modification on the skin-core structure fiber, converting part of the groups in the modifiable polymer layer into static water absorption groups, thereby converting the modifiable polymer layer into a static water absorption layer, to obtain a modified fiber; performing hydrophilization treatment and hydrophobization treatment on the modified fiber, to form a structure with hydrophilic regions and hydrophobic regions arranged alternately along the fiber axis. The present application takes the cellulose fiber rich in hydrophilic functional groups as the core layer, and constructs a hydrophilic and hydrophobic alternating structure in the skin layer, to realize active capture of fog water droplets, thereby improving the fog water collection efficiency.

The invention relates to a double-phase powder slurry composition and application thereof, an oil-in-water sunscreen system and a preparation method thereof, and the double-phase powder slurry composition comprises the following components in parts by weight: 4-6.5 parts of hydrophilic nano titanium dioxide powder slurry; and 1.5-4 parts by weight of a lipophilic micron titanium dioxide powder slurry, wherein nanoscale titanium dioxide in the hydrophilic nanometer titanium dioxide powder is subjected to hydrophilic surface treatment of hydrated silica and lecithin, and the average primary particle size is 10-100 nm; micron-sized titanium dioxide in the lipophilic micron-sized titanium dioxide powder slurry is subjected to hydrophobization surface treatment of triethoxyoctyl silane, and the average primary particle size is 1-10 [mu] m; the solid mass ratio of the nanoscale titanium dioxide to the micron-sized titanium dioxide is (1: 0.5)-(1: 1). Through the synergistic effect of the hydrophilic nano-scale titanium dioxide and the oleophylic micron-scale titanium dioxide in the two-phase powder slurry composition, the oil-in-water sunscreen emulsion which has a high SPF value, high water resistance, natural optical brightening, refreshing skin feeling and long-term stability is obtained.

The invention relates to the field of new chemical materials, and discloses a polyacrylamide / polyurethane dual-network hydrogel based on a sacrificial bond energy dissipation mechanism and a preparation method thereof. The preparation method comprises the following steps: S1, preparing an acrylamide precursor, adjusting the pH value, carrying out polymerization to obtain polyacrylamide colloid, and carrying out crushing granulation, alkaline post-hydrolysis, drying and secondary crushing to obtain powder; s2, enabling polyethylene glycol and hexamethylene diisocyanate to react under the catalysis of dibutyltin dilaurate by adopting a prepolymer method, adding a chain extender, and performing neutralization hydrophilization, high-speed shearing emulsification and ethanediamine post-chain extension to obtain a waterborne polyurethane emulsion; s3, performing in-situ polymerization on the powder and the emulsion by a one-pot method to form an interpenetrating double-network structure; the hydrogel obtained in the invention takes a waterborne polyurethane network as a sacrifice bond to consume energy, and a polyacrylamide network maintains matrix integrity, so that the hydrogel has better mechanical properties and can be used in different fields such as biomedical engineering.

The present application provides a semiconductor wafer surface hydrophilization treatment liquid capable of imparting hydrophilicity to the surface of a semiconductor wafer. The semiconductor wafer surface hydrophilization treatment liquid of the present application contains water and a compound represented by the following formula (1), and the total content of water and the compound represented by the following formula (1) is 95% by weight or more, R 1 O-(C3H6O2) n -H (1) (in the formula, R 1 represents a hydrogen atom, a hydrocarbon group having 1 to 24 carbon atoms which optionally has a hydroxyl group, or R 2 CO represents a group, the aforementioned R 2 represents a hydrocarbon group having 1 to 24 carbon atoms, and n represents the average polymerization degree of the glycerol unit shown in the parentheses and is 2 to 60).

The invention relates to novel biocompatible hybrid nanoparticles of very small size, useful in particular for diagnostics and / or therapy.The purpose of the invention is to offer novel nanoparticles which are useful in particular as contrast agents in imaging (e.g. MRD and / or in other diagnostic techniques and / or as therapeutic agents, which give better performance than the known nanoparticles of the same type and which combine both a small size (for example less than 20 nm) and a high loading with metals (e.g. rare earths), in particular so as to have, in imaging (e.g. MRI), strong intensification and a correct response (increased relaxivity) at high frequencies.Thus, the nanoparticles according to the invention, with diameter d1 between 1 and 20 nm, each comprise a polyorganosiloxane (POS) matrix including gadolinium cations optionally associated with doping cations; a chelating graft C1 DTPABA (diethylenetriaminepentaacetic acid bisanhydride) bound to the POS matrix by an —Si—C— covalent bond, and present in sufficient quantity to be able to complex all the gadolinium cations; and optionally another functionalizing graft Gf* bound to the POS matrix by an —Si—C— covalent bond (where Gf* can be derived from a hydrophilic compound (PEG); from a compound having an active ingredient PA1; from a targeting compound; from a luminescent compound (fluorescein).The method for the production of these nanoparticles and the applications thereof in imaging and in therapy also form part of the invention.

The present disclosure relates to a process to metallise and bond silicon carbide ceramic surfaces. The process comprises hydrophilising the silicon carbide surface with a hydrophilising agent to form a hydrophilised silicon carbide surface; contacting the hydrophilised silicon carbide surface with a solution comprising one or more monovalent metal ions; reducing the one or more monovalent metal ions to form metal nanoparticles on the hydrophilised silicon carbide surface by the application of energy to the one or more monovalent metal ions and the hydrophilised silicon carbide surface; to provide the nanoparticle seeded silicon carbide surface. Also disclosed herein is a process to produce a hermetically sealed diffusion bond between silicon carbide surface.

The invention provides a sewage treatment method beneficial to sludge reduction, and relates to the field of sewage treatment. The sewage treatment method comprises the following steps: adding graphene subjected to surface hydrophilization modification into an activated sludge system, and intensifying the formation of granular sludge through anaerobic-aerobic alternate operation and hydraulic separation in a sequencing batch reactor. The Raman spectrum ID / IG ratio of the modified graphene is less than or equal to 0.2. According to the present invention, the modified graphene provides the microorganism attachment carrier and the electron transfer channel, and the dynamic precipitation control strategy is combined to achieve the rapid formation of the granular sludge, the improvement of the system treatment efficiency and the significant reduction of the excess sludge, such that the method is suitable for the low-carbon and high-efficiency municipal and industrial sewage treatment.

The application provides a TPU material and a preparation method and application thereof, and a preparation method of a TPU material, which comprises the following steps: S1, surface cleaning pretreatment of a polyurethane material; S2, surface activation of the polyurethane material after the pretreatment in S1 by using plasma to obtain the activated polyurethane material; S3, grafting reaction of the activated polyurethane material in S2 by immersing the activated polyurethane material in a polyvinylpyrrolidone aqueous solution, the concentration of the polyvinylpyrrolidone aqueous solution is 1wt.%-25wt.%, the temperature of the grafting reaction is 40-80 DEG C, and the grafted polyurethane material is obtained. The TPU material prepared by the application is a polyester thermoplastic polyurethane with certain toughness and thickness, and the surface thereof usually presents strong hydrophobic characteristics; by using the method of low-temperature plasma surface activation and induced grafting, the surface of the TPU material can be strongly modified to be hydrophilic, and the stability can be maintained for a long time.

The application relates to a kidney-excretable nano-gold aggregate, a preparation method and application as a CT contrast agent, and comprises the following steps: mixing chloroauric acid solution, lye and a mercapto hydrophilic compound to obtain mixed solution A; under the condition of ice water bath and stirring, a reducing agent is added into the mixed solution A to obtain mixed solution B containing nano-gold particles; the mixed solution B is mixed with a wrapping material-buffer solution to obtain mixed solution C containing nano-gold particles@wrapping material; a positively charged compound solution is added into the mixed solution C to obtain mixed solution D; the nano-gold is made into a stable aggregate by the positively charged compound; and the mixed solution D is centrifuged to obtain the kidney-excretable nano-gold aggregate. The synthesized super-small nano-gold is agglomerated into a nano-gold aggregate with stable structure, and the contrast agent can be obtained by simple centrifugal concentration, the contrast agent is stable in property, has good biocompatibility, and can be discharged out of the body along with urine within a period of time after entering the body.

A separation method comprises: a hydrophilization step for subjecting an electrode being treated, which is provided with a current collector and an electrode mixture that is formed on the current collector, to a hydrophilization treatment; and an ultrasonic step for subjecting the electrode being treated, which was subjected to the hydrophilization treatment, to an ultrasonic treatment while sweeping the frequency of ultrasonic waves in treatment water, thereby separating the current collector and the electrode mixture. A treatment method comprises a plasma unit that performs a plasma treatment on an electrode mixture containing polyvinylidene fluoride so that the ratio of fluorine derived from the polyvinylidene fluoride, obtained through XPS analysis, satisfies at least one condition from among being reduced to 5 at% or less or being no more than 0.4 times the ratio before the plasma treatment.

To provide a base material particle for forming a conductive particle having a large projection capable of effectively removing an oxide film and a binder resin of an electrode.SOLUTION: In the base material particles, the convex portions are aggregates of metallic oxides or metallic hydroxides in which an average particle size of primary particles is 1 to 100nm. The substrate particles can be produced by a production method in which hydrophilized base particles are added to an aqueous solution containing a metal-fluoro complex compound and a fluorine ion scavenger to form aggregates of a metal oxide or metal hydroxide on the surface of the base particles, thereby obtaining substrate particles having protruded portions on the particle surface.SELECTED DRAWING: Figure 1

The invention relates to the technical field of environment-friendly high polymer materials and functional coatings, and discloses yellow-green fluorescent water-borne epoxy resin for photovoltaic aluminum profiles and a preparation method of the yellow-green fluorescent water-borne epoxy resin. The method comprises the following steps: S1, synthesizing fluorescent dihydric alcohol (NTDI-Diol), S2, synthesizing a fluorescent dicarboxylic acid chain extender (CA-Fluo), S3, taking the CA-Fluo as a chain extender, carrying out ring-opening addition reaction with epoxy resin, and carrying out composite hydrophilic modification and phase inversion emulsification, so as to prepare the waterborne epoxy resin with low-temperature rapid curing, high flexibility and intrinsic fluorescence function. According to the invention, the synergism of technical characteristics and effects is realized through molecular structure design, and the coating can be hard-dried at 5 DEG C for 36 hours, has fluorescence performance and excellent salt fog resistance, is suitable for high-end industrial coating of photovoltaic aluminum profiles and the like, and has a good application prospect.

The invention provides a bilayer active biological aerosol sampling membrane of a bionic peritoneum and a preparation method of the bilayer active biological aerosol sampling membrane of the bionic peritoneum, the sampling membrane is formed by compounding a functional capture layer and an activity maintaining base layer through interface crosslinking, and the functional capture layer is composed of a hydrophilic modified polypropylene porous film. The activity maintaining base layer is composed of porous hydrogel loaded with nutrient substances. The preparation method comprises the following steps: preparing the functional capture layer; preparing an activity maintaining base layer; and compounding. Through the bionic peritoneum structural design, the bioaerosol can be efficiently intercepted, and meanwhile, the activity of microorganisms in the bioaerosol can be maintained for a long time.

Provided are: a hydrophilization treatment agent; and a method for forming a hydrophilic coating film, which are capable of forming a coating film which has excellent hydrophilicity and water droplet removal properties and can maintain the excellent water drop removal properties. A polyetheramine is added to a specific aqueous resin dispersion and crosslinkable fine particles in a specific composition. Specifically, this hydrophilization treatment agent contains an aqueous resin dispersion (A), crosslinkable fine particles (B), and a polyetheramine (C), wherein: the aqueous resin dispersion (A) contains an ethylene-vinyl alcohol copolymer (A1) as a resin solid content and a radical polymer (A2) having a structural unit derived from a radically polymerizable carboxylic acid monomer (A2-1); ((A1) / (A2)) is 0.43-2.33; ((B) / (resin solid content of (A)) is 0.11-1.43; and ((C) / ((resin solid content of (A))+(B))) is 0.1-0.38.

The present invention aims to provide a method for preparing rare earth nanoparticles@cobalt tetroxide heterostructure nanomaterials and their application, belonging to the field of nanomaterials and biomedical technology. The nanomaterials include a rare earth nanoparticle core and a cobalt tetroxide functional layer deposited on its surface. The preparation method includes the following steps: preparation of rare earth nanoparticles; surface ligand exchange and hydrophilic treatment; deposition of the cobalt tetroxide functional layer; PEG modification for water solubility, finally obtaining rare earth nanoparticles@cobalt tetroxide heterostructure nanomaterials. The obtained nanomaterials can simultaneously regulate ROS levels, alleviate hypoxia, and regulate energy metabolism in an inflammatory microenvironment.

Provided is a hydrophilic treatment coating composition which imparts a soil guard property and is superior in durability of soil guard performance. Provided is a hydrophilic treatment coating composition for an inorganic substrate surface-treated with a silane coupling agent (S), comprising a hydrophilic compound (A) and a hydrophilic compound (B), wherein the hydrophilic compound (A) is a compound having at least one of a sulfonic acid group and an alkali metal salt of a sulfonic acid group, and the hydrophilic compound (B) is a compound having a quaternary ammonium cationic group.

The application discloses a polycarbodiimide composition, an adhesive composition and a preparation method and application thereof. The polycarbodiimide composition comprises component A and component B; the component A comprises a compound as shown in a formula I; the component B comprises a compound as shown in a formula II; the mass ratio of the compound of the formula I to the compound of the formula II is 0.25-4:1; R1 is a divalent aliphatic hydrocarbon group with 1-18 carbon atoms or a divalent alicyclic hydrocarbon group with 3-13 carbon atoms; R4 is a divalent aromatic hydrocarbon group with 6-13 carbon atoms; R2, R3, R5 and R6 are independently residues of a hydrophilic compound containing active hydrogen after removing hydrogen atoms; the hydrophilic compound is an alcohol compound, an ether compound or an amine compound, the molecular weight of the hydrophilic compound is less than 1500 g / mol; and n or m is 1-10.

This invention belongs to the field of atomic force microscopy (AFM) measurement technology, specifically disclosing a method for modifying the tip of an AFM probe. The method includes the following steps: synthesizing a polymer stock solution to obtain a pre-solidified gel-like polymer; placing the AFM probe into a microgroove within a specially designed silicon wafer fixture, cleaning the probe using oxygen plasma, and hydrophilicating the tip; based on the contact mode of AFM, pressing the cleaned and hydrophilicated probe tip into the gel-like polymer for modification; placing the modified AFM probe into the microgroove within the specially designed silicon wafer fixture, heating to achieve complete solidification, and finally coating the probe tip with a thin polymer film. This invention enables the modification of ordinary Si-based probe tips with the same composition of polymers and can accurately test the adhesion behavior between polymers and proteins, providing a method for determining the interaction between polymers and other substances.

The invention discloses a rare earth doped aluminate nanocrystal capable of emitting light in a near-infrared second region through ultrasonic excitation as well as a preparation method and application of the rare earth doped aluminate nanocrystal. The preparation method comprises the following steps: mixing an alkaline earth metal ion compound, an aluminum ion compound, a rare earth ion compound and a polydentate ligand in water for complex reaction to prepare a metal ion chelate precursor; performing high-temperature solid-phase thermal decomposition reaction on the metal ion chelate precursor, performing surface fat-soluble molecular modification in a thermal solvent, and performing surface hydrophilization modification by adopting an amphiphilic polymer to prepare the rare earth doped aluminate nanocrystal capable of emitting near-infrared second region by ultrasonic excitation. The rare earth doped aluminate nanocrystal is prepared by adopting an amorphous complex high-temperature solid-phase thermal decomposition method, the reaction condition is controllable, the operation is simple, the repeatability is good, the used reagent is cheap and easy to obtain, the rare earth doped aluminate nanocrystal has the property of ultrasonic excitation near-infrared second-region luminescence, and the wavelength can be adjusted within 900-2500 nm.