29results about How to "Optimal Control Structure" patented technology

The invention provides anisotropic thermoelectric hydrogel, which is characterized in that hydrogel is used as a matrix, and a thermoelectric material is dispersed and fixed in the hydrogel matrix; the hydrogel matrix is formed by biocompatible macromolecules through a directional freezing method or a mechanical stretching method, and has an anisotropic internal microstructure oriented in a single direction. Through a directional freezing or mechanical stretching process, a microstructure oriented in a single direction is constructed in the thermoelectric hydrogel, so that the hydrogel has anisotropy of shrinkage characteristics. The two preparation methods disclosed by the invention are both based on physical crosslinking and orientation technologies, complex chemical modification or expensive equipment is not needed, and effective design of the shrinkage anisotropy of the material is realized by controlling freezing conditions (such as liquid level height and cooling direction) or stretching parameters (such as stretching ratio and cycle index); and mutual conversion between heat energy and electric energy can be realized through a thermoelectric material in the hydrogel network.

This application relates to the field of organosilicon polymer materials, specifically disclosing a method for preparing and applying a functionalized MQ silicone resin. A method for preparing a functionalized MQ silicone resin includes the following steps: (1) raw material pretreatment; (2) simultaneous addition reaction: mixing and reacting a hydrogen-containing MQ silicone resin, a terminal olefin monomer containing a benzocyclobutene functional group, and a terminal olefin monomer containing a C-F bond; (3) post-treatment to obtain the functionalized MQ silicone resin; wherein the molar ratio of Si-H bonds in the hydrogen-containing MQ silicone resin, C=C bonds in the terminal olefin monomer containing a benzocyclobutene functional group, and C=C bonds in the terminal olefin monomer containing a C-F bond is 1:(0.2-0.6):(0.1-0.4). This application enables the synergistic effect of the rigid benzocyclobutene group and the fluorinated flexible segment, one-step grafting, and structural controllability, ultimately preparing a functionalized MQ silicone resin with excellent dielectric properties, high temperature resistance, low-temperature flexibility, good hydrophobicity, and excellent mechanical strength.

This invention discloses a samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal material, its preparation method, and its applications. The samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal material belongs to the monoclinic crystal system, has a space group of Cm, and a chemical formula of Sm. 0.3 La 0.1 :Y 0.6 Ca4O(BO3)3 has a second harmonic response intensity of 0.89 × KDP, and exhibits transmittance exceeding 80% in the 500–1000 nm and 1600–2400 nm wavelength ranges. It also has a strong absorption peak in the 1000–1600 nm wavelength range. Therefore, the samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal can be considered as a nonlinear optical crystal material with broad application prospects in the field of optics.

The utility model discloses plastic material production equipment, relates to the technical field of positive and negative electrode material preparation equipment, and aims to solve the problem of structural regulation and control of the conventional positive and negative electrode material preparation. Comprising a box body and a cylinder body, the box body is communicated with the cylinder body through an adapter, and heating assemblies for heating the interiors of the box body and the cylinder body are arranged on the box body and the cylinder body; a feeding port communicated with the interior of the box body is formed in the box body, a conveying belt is further arranged in the box body, the conveying belt is driven by a conveying motor, a roller column is further arranged in the box body, the roller column is of a composite structure, and the roller column is arranged above the conveying belt and rolls materials on the conveying belt. The two ends of the cylinder body are rotationally connected with the adapter and the discharging port respectively, the cylinder body is driven by the driving mechanism, the discharging port is formed in the supporting seat, and an inner wall threaded groove is formed in the inner wall of the cylinder body. And meanwhile, the productivity is also improved.

This invention belongs to the field of fire extinguishing materials and their preparation technology, and provides a fire extinguishing microcapsule and its microfluidic controllable preparation method. The preparation method is characterized by the following steps: (1) preparing fluids of each phase, (2) preparing a dual emulsion using a microfluidic device, (3) collecting and sealing the dual emulsion in a collection container, controlling the axis of the collection container to be horizontal, and controlling the collection container to rotate around its axis for 1 to 15 minutes, applying light to solidify the outer shell of the dual emulsion droplets while maintaining the rotation of the collection container, cleaning, and drying to obtain the final product. The fire extinguishing microcapsule prepared by this method consists of an outer shell and a liquid fluorine-containing fire extinguishing agent encapsulated within the outer shell. The outer shell of the fire extinguishing microcapsule has a uniform thickness, and the eccentricity between the outer shell and the core is less than 0.1. The method of this invention can achieve precise customization of fire extinguishing microcapsules according to the differentiated fire characteristics of different application scenarios, and can improve the concentricity between the core and the outer shell of existing fire extinguishing microcapsules.

This invention discloses Au nanoparticles loaded with bimetallic compounds for photocatalysis and their preparation method, belonging to the field of photocatalytic materials technology. Preparation steps: S1: Tetrachloroauric acid, quaternary ammonium salt, and citric acid are added to a sodium borohydride solution and stirred at 25-120℃ for 1-3 hours to obtain solution A; solution B is prepared containing quaternary ammonium salt, tetrachloroauric acid, ascorbic acid, silver nitrate, and hydrochloric acid; solutions A and B are mixed and stirred at 25-50℃ for 1-15 hours to obtain Au nanoparticles; S2: Solution C is prepared containing quaternary ammonium salt, a first metal source, and ascorbic acid; solution D is prepared containing quaternary ammonium salt, a second metal source, NaOH, and ascorbic acid; Au nanoparticles are mixed with solution C and reacted at 40-80℃ for 1-5 hours; then the supernatant is removed by centrifugation, and solution D is added again, reacting for 1-5 hours to obtain Au nanoparticles loaded with bimetallic compounds. This invention enables controllable nanoparticle structure and allows for metal loading at different sites by adjusting synthesis parameters.

The application discloses a preparation method of high-strength and high-ductility titanium-based composite material with a composition gradient, and comprises the following steps: 1, material selection: selecting a plurality of Mo equivalent different beta type titanium alloy powder as a matrix material, and selecting carbon nanoparticles as a precursor material of a reinforcing body; 2, powder mixing: placing the plurality of Mo equivalent different beta type titanium alloy powder and the carbon nanoparticles in a ball mill and ball milling and uniformly mixing; 3, forming: performing plasma sintering forming on the mixed powder; 4, heat treatment: performing solid solution treatment on a titanium-based composite material blank to obtain the high-strength and high-ductility titanium-based composite material with the composition gradient. The application utilizes a powder metallurgy method to sinter the plurality of Mo equivalent different beta type titanium alloy powder and the carbon nanoparticles into a bulk alloy, so that the sintered bulk alloy has the composition gradient, and the prepared titanium-based composite material with the composition gradient has excellent mechanical properties and is a high-strength and high-elongation composite material.

The invention discloses a lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material and a preparation method thereof, the lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material belongs to a monoclinic system, the space group is Cm, the chemical formula is La0.1: Y0. 9Ca4O (BO3) 3, the frequency multiplication coefficient is 2 * KDP, the ultraviolet cut-off edge is less than 200 nm, and no absorption peak with the intensity greater than or equal to 0.2 cm <-1 > exists in the range of 200-2500 nm. Therefore, the lanthanum ion doped yttrium calcium oxide borate crystal can be used as a nonlinear optical material with a wide application prospect in the field of optical parameter chirped pulse amplification.

The application relates to the technical field of lithium ion batteries, and discloses a negative electrode active material, a preparation method thereof and a lithium ion battery. The negative electrode active material comprises nano silicon and a three-dimensional carbon conductive grid, the nano silicon is embedded in the three-dimensional carbon conductive grid, the three-dimensional carbon conductive grid comprises uniformly mixed carbon nanotubes, layered graphene and graphite powder, the mass percentage of the nano silicon is 15%-35%, the mass percentage of the graphite powder is 32.5%-59.5%, and the mass ratio of the carbon nanotubes to the layered graphene is 1:2-8. The application uniformly mixes the carbon material with multiple shapes including carbon nanotubes, layered graphene and graphite powder with the nano silicon, forms a three-dimensional carbon conductive network structure, effectively absorbs the volume expansion of Si, improves the isotropic conductive performance and conductive efficiency of the active material, and has high structural stability.

The invention discloses a preparation method and application of a cobalt phosphide electrocatalyst with an adjustable interface water-hydrogen bond network, and belongs to the field of electrocatalytic materials. Cobalt nitrate, variable valence metal chlorine salt and urea are used as raw materials to synthesize a hydroxide precursor, and after simple low-temperature phosphating reaction treatment, in-situ oxidation reconstruction is carried out in the water electrolysis oxygen evolution reaction process to prepare the cobalt hydroxide. The preparation method disclosed by the invention has the advantages of simplicity in operation, high efficiency, environmental friendliness, strong controllability, low cost and the like; and the prepared cobalt phosphide oxygen evolution electrocatalyst has the advantages of adjustability of an interface water-hydrogen bond network, high stability, excellent oxygen evolution activity and the like.

The invention belongs to the technical field of preparation of inorganic non-metallic materials, and particularly relates to a preparation method of high-purity opaque quartz glass. The method comprises the following steps: by taking high-purity silica sol with impurity content of less than 1ppm as a raw material, compounding silica sol with various particle sizes in proportion, concentrating under reduced pressure until the content of silicon dioxide is 40-60%, adding an acrylamide gel enhancing system into the compounded sol, controlling the temperature to gelatinize the compounded sol, and preserving heat to improve the gel strength; and drying the wet gel at a low temperature of 60-80 DEG C and a relative humidity of 80-95% until the moisture content is less than 5%, then carrying out normal pressure dehydration, organic matter removal and presintering treatment on the dried gel blank, placing the presintered blank in a graphite container, and melting and preserving heat at 1400-1650 DEG C under the protection of nitrogen for 2-8 hours to obtain the non-quartz glass. And the pore size and density can be controlled by regulating and controlling the melting temperature and the heat preservation time. The total impurity content of the quartz glass prepared by the method is less than 5ppm, the structure is uniform, the density can be adjusted in a range of 1.8-2.1 g / cm < 3 >, and the quartz glass has good shading and heat-insulating properties.

This invention provides a method for preparing a three-dimensional textured macroporous carbon composite with adjustable carbon shell morphology, comprising the following steps: S1, dispersing a phenolic prepolymer in a solvent to prepare a phenolic prepolymer slurry; S2, adding graphene oxide to the prepared phenolic prepolymer slurry, mixing well, and preparing a carbon precursor spraying liquid; S3, spraying the prepared carbon precursor spraying liquid onto a planar fiber carrier to obtain a carbon precursor carrier composite; S4, heat-treating the carbon precursor carrier composite to obtain three-dimensional hollow porous carbon. This invention uses planar fiber materials as the reaction site, eliminating the need for other templates, and uses graphene oxide as the key component of the carbon precursor. Combining the advantages of continuous operation technology such as ultrasonic dispersion and atomized spraying, the carbon precursor is composited on the surface and interior of the carrier. After heat treatment, three-dimensional hollow porous carbon is prepared. The morphology of the carbon shell composited on the three-dimensional textured macroporous carbon framework can be controlled simply by adjusting the content of the key components in the carbon precursor.

The present application belongs to the field of gene drug delivery, and particularly relates to a kind of lipid compound with glutaric acid skeleton and lipid carrier, nucleic acid lipid nanoparticle composition and pharmaceutical preparation based thereon.The compound with the structure of formula (I) of the present application can be prepared into lipid carrier alone or together with other lipid compounds.The lipid carrier has high encapsulation efficiency for nucleic acid drugs, which helps to improve the delivery efficiency of nucleic acid drugs in vivo;Multiple biodegradable functional groups are contained, so that the lipid metabolism is fast, and the biological safety is high.Moreover, the lipid carrier can also deliver nucleic acid drugs to organs that need to be enriched, and has good application prospect.

The invention relates to a preparation method of a graded porous Murphy material based on cooperation of microfluidics, ink-jet printing and emulsion evaporation, and solves the technical problems that an existing preparation method of the graded porous Murphy material is harsh in condition, the porosity is difficult to regulate and control, and the prepared porous material is unstable in pore structure and low in uniformity. Silicon dioxide nano particles are introduced into an emulsion dispersion phase, self-assembly of the nano particles is driven by utilizing cohesion force generated by preferential evaporation of the dispersion phase, a silicon microsphere single-layer structure in hexagonal arrangement is formed, macroscopic pores are formed among microspheres, mesoscopic pores are formed among nano particles in the microspheres, and finally the graded porous Murphy material is obtained.

The application provides a material preparation method based on purification and delamination synergistic optimization of montmorillonite, and comprises the following steps: S1, pretreating natural montmorillonite raw materials; S2, centrifugal purification by using a purification parameter linear optimization model; S3, preparing a montmorillonite delamination precursor; S4, ultrasonic delamination treatment by using a delamination effect dynamic regulation model; S5, purification and delamination synergistic optimization adjustment; S6, delamination montmorillonite stabilization treatment; S7, material forming and drying; S8, material sintering and performance characterization. Through the whole-process intelligent synergy of "raw material characteristics-purification parameters-delamination effect", the application breaks through the limitations of traditional processes and realizes efficient and stable preparation of montmorillonite materials.

The application discloses a novel small-molecule electron acceptor material, a preparation method thereof and an organic solar cell, and relates to the technical field of organic solar cells. λ onset The small-molecule electron acceptor material has a high-efficiency near-infrared spectrum (greater than 1000 nm) response and a low open-circuit voltage loss. The selenium phenol unit is introduced, the polarizability of selenium atoms and the heavy atom effect are utilized, the intermolecular interaction is enhanced, and the absorption spectrum of the molecule is widened; through side chain modification, multiple intramolecular oxygen-sulfur non-covalent interactions are introduced, on the one hand, the intramolecular ICT effect is enhanced, the band gap is reduced, on the other hand, the multiple oxygen-sulfur non-covalent bonds lock the molecular configuration, the molecular rigidity is enhanced, vibration is inhibited, non-radiative recombination and open-circuit voltage loss are reduced. λ onset The application is applied to organic solar cell single-junction and tandem devices, and the photovoltaic response characteristics of more than 1000 nm are realized, and energy conversion efficiencies of more than 17% and 21% are obtained, which are the highest device efficiencies of the spectrum response of more than 1000 nm in the current research field of organic solar cells.

This invention relates to a metal foil, a porous copper foil, a method for preparing the same, and a lithium-ion battery using the material. This method allows for the preparation of relatively thin metal foils, including copper foil, through a simple, low-cost, and easily industrially scalable approach. Furthermore, the pore size and thickness of the porous copper foil can be controlled based on the screen printing pattern, the height difference between the screen printing plate and the titanium plate, and the electrolysis time. This effectively solves the problems of complex pore size control and excessively thick foils in current metal foil, especially porous copper foil, preparation methods.

This application relates to the field of bio-based copolyester technology, and discloses a bio-based copolyester, its preparation method, and its applications. The preparation method of the bio-based copolyester includes: prepolymerizing an aliphatic lactone under an inert atmosphere and at a temperature of 160–180°C in the presence of a catalyst to obtain a prepolymer; adding a cyclic butylene terephthalate oligomer to the prepolymer, and then prepolymerizing at 180–200°C; and finally, after vacuuming, heating to 220–250°C for further polymerization to obtain the bio-based copolyester. In this application, the aliphatic lactone is first prepolymerized at a lower temperature through ring-opening; the prepolymer and the cyclic butylene terephthalate oligomer are then mixed uniformly in a liquid state for prepolymerization, followed by final polymerization at a higher temperature; the prepolymerization, prepolymerization, and final polymerization are carried out stepwise at different temperatures to obtain a bio-based copolyester with controllable structure and high molecular weight. The copolyester of this application has a number-average molecular weight of 18,000 to 25,000, and the mechanical properties of the melt-spun fibers are ≥3.00 cN / dtex breaking strength and 20.0 to 50.0% breaking elongation.

This invention discloses a method for preparing a cobalt phosphide electrocatalyst with a tunable interfacial water hydrogen bond network and its application, belonging to the field of electrocatalytic materials. The invention uses cobalt nitrate, variable-valence metal chloride salts, and urea as raw materials to synthesize a hydroxide precursor, which is then subjected to a simple low-temperature phosphating reaction followed by in-situ oxidation and reconstruction during the oxygen evolution reaction of water electrolysis. The preparation method of this invention has advantages such as simple operation, high efficiency, environmental friendliness, strong controllability, and low cost. The prepared cobalt phosphide oxygen evolution electrocatalyst possesses advantages such as a tunable interfacial water hydrogen bond network, high stability, and excellent oxygen evolution activity.

The invention aims to provide a preparation method of a degradable functionalized silicon-based bioactive nano platform, which belongs to the technical field of nano materials, and comprises the following steps: dripping an oil-phase solution containing a silicon source into a water-phase solution containing a manganese source by using an oil-water two-phase method; mesoporous Mn / Si nanoparticles uniformly doped with manganese can be obtained through stirring under a mild heating condition and high-temperature calcination, and drug loading and bovine serum albumin coating are further realized through stirring. The preparation method is simple in synthesis step, short in time consumption, uniform in metal doping, stable in product structure and good in drug loading capacity. The degradation performance of the nano-platform can be regulated and controlled by regulating and changing the adding amount of the swelling agent, the surfactant and the manganese source in the synthesis system. The diameter of the prepared degradable functionalized silicon-based bioactive nano platform is 115-145 nm, and the degradable functionalized silicon-based bioactive nano platform can be responsively degraded in an acidic microenvironment to release ions and drugs and is expected to be used for diagnosis and treatment of diseases.

The application discloses a vanadium tungstate-based zeolite-like octahedral metal oxide catalyst, and the molecular formula of the catalyst is X 0.5～2 H 0～1 [(VO)3W4O 16 ] with a cubic crystal system, a space group of PA-3 and a cell parameter of alpha=90°, wherein X is K, Co or Cs, [W4O 16 ] 8‑ is a building unit, VO 2+ is a connecting point, the number of the building units in the unit cell is 8, and the number of the connecting points is 8. The vanadium tungstate-based zeolite-like octahedral metal oxide catalyst disclosed by the application has high catalytic activity, controllable structure and low cost, can efficiently catalyze direct oxidation of methane to methanol by oxygen at a low temperature of 60-150 DEG C, solves the problems of high cost, high reaction temperature and low activity of a noble metal catalyst, and the preparation method of the catalyst is simple, the reaction process is controllable, and the preparation repeatability is good.

The application relates to the technical field of electrode materials, in particular to a nickel-cobalt-aluminum hydroxide as well as a preparation method and application thereof. The preparation method provided by the application comprises the following steps: mixing a soluble nickel source, a soluble cobalt source, a soluble aluminum source, oxalic acid and water, and then performing a hydrothermal reaction to obtain a nickel-cobalt-aluminum oxalate compound precursor with a sheet-shaped self-assembled spherical structure; mixing the nickel-cobalt-aluminum oxalate compound precursor with the sheet-shaped self-assembled spherical structure, water and sodium hydroxide to obtain the nickel-cobalt-aluminum hydroxide. The nickel-cobalt-aluminum hydroxide prepared by the preparation method has excellent electrochemical performance.

The application relates to the technical field of material preparation, and discloses a preparation and application of a modified chitin nanocrystal-nano silver antibacterial hybrid material. The hybrid material is obtained by in-situ reduction of silver ions by taking aldehyde group functionalized chitin nanocrystals as a template agent and a reducing agent. The method provides a brand-new preparation method of aldehyde group functionalized chitin nanocrystals, is simple, compound structure is controllable, and is green and sustainable; meanwhile, the aldehyde group functionalized chitin nanocrystals are used as a template of nano silver, the reducibility of the surface aldehyde group is utilized to realize loading of the nano silver, and the modified chitin nanocrystal-nano silver antibacterial hybrid material is constructed; in addition, when the modified chitin nanocrystal-nano silver antibacterial hybrid material is used as a polylactic acid filler, the mechanical property, the antibacterial property and the ultraviolet resistance of the polylactic acid can be improved.

The invention discloses low-molecular-weight high-activity polyisobutene and a preparation method thereof, and belongs to the field of preparation of high-molecular compounds. According to the preparation method, the low-molecular-weight and high-activity polyisobutene is prepared through catalysis of a simple initiator, a co-initiator and a third component system. And preparing the low-molecular-weight and high-activity polyisobutene with the external olefin proportion of 90% at a relatively high temperature (-30 DEG C to 0 DEG C) by using a simple and easily available initiator and Lewis acid with relatively weak corrosion to equipment as a co-initiator and regulating and controlling a three-component catalytic system and optimizing a process flow. The preparation method comprises the following steps: preparing the low-molecular-weight and high-activity polyisobutene with the external olefin proportion of 90% at a relatively high temperature (-30 DEG C to 0 DEG C).

The invention discloses a two-dimensional antiferromagnetic material and a preparation method and application thereof, and the method comprises the following steps: adopting Mn and Te elementary substance powder, taking I2 as a transportation agent, and synthesizing a blocky MnTe precursor through a vacuum chemical vapor transport method under a vacuum sealing condition; the preparation method comprises the following steps: mixing a ground MnTe precursor with In elementary substance powder and fluxing agent KCl powder, carrying out fluxing reaction in a vertical confinement space constrained by a constant normal pressure and in an inert atmosphere, and inducing the crystal to epitaxially grow along the horizontal direction, thereby forming a two-dimensional Mn (InTe2) 2 crystal on a fluorine crystal mica substrate, and carrying out wet transfer to obtain the two-dimensional Mn (InTe2) 2 crystal on a SiO2 / Si substrate, according to the method, the two-dimensional Mn (InTe2) 2 crystal with the antiferromagnetic characteristic is prepared through a step-by-step precursor induction type confinement pressure melting epitaxial method, and the method is simple in process and high in repeatability; the two-dimensional Mn (InTe2) 2 crystal has the characteristics of good crystal quality, large transverse size, controllable layer number and the like, and can be applied to a high-density magnetic storage device.

The application discloses a kind of three-dimensional mesoporous carbon composite silicon-carbon negative electrode materials and preparation method and application thereof, and relates to the technical field of battery.A kind of preparation method of three-dimensional mesoporous carbon composite silicon-carbon negative electrode material, comprising the following steps: additive 1 and additive 2 are dissolved in deionized water respectively, obtain solution A and solution B, in solution A is added to solution B, obtain solution C;Additive 3 is dissolved in deionized water, obtain solution D, solution C is added to solution D, obtain solution E;High-temperature calcination obtains template A;After reaction, solution G is obtained;Template B is obtained;Sample is obtained;Carbonized sample is obtained, after drying, dry sample is obtained;Dry sample is activated at high temperature in carbon dioxide gas environment, obtain three-dimensional mesoporous carbon material, then carry out chemical vapor deposition, obtain three-dimensional mesoporous carbon composite silicon-carbon negative electrode material.The application solves the problem that significant volume expansion occurs in the charge and discharge process of silicon-based negative electrode material.

The invention relates to the technical field of thermoelectric materials, in particular to a micro-crack structure thermoelectric thin film constructed based on PEDOT: PSS and polyaniline and a preparation method thereof.The preparation method comprises the following steps that a PEDOT: PSS raw material is selected, filtered and then dispersed in absolute ethyl alcohol, and uniform PEDOT: PSS dispersion liquid is obtained; the preparation method comprises the following steps: selecting a polyaniline raw material, and dispersing in absolute ethyl alcohol to obtain a stable and uniform polyaniline suspension; a vacuum suction filtration device is adopted, the specific vacuum degree is controlled, PEDOT: PSS dispersion liquid, polyaniline suspension liquid and PEDOT: PSS dispersion liquid are sequentially added, and a sandwich structure composite film precursor is formed through layered suction filtration. The method can be realized by adopting conventional vacuum filtration equipment, the microcrack structure is controllable, the thermoelectric performance can be optimized by adjusting the number of layers and the concentration, the prepared film has good flexibility and environmental stability, and the thermoelectric performance of the PEDOT: PSS-based composite material is improved.

This invention relates to the field of artificial intelligence sensor fabrication technology, specifically to a method for preparing a highly crystalline cellulose piezoelectric membrane and its sensor, and its application. The method includes: pretreating the raw materials of the cellulose piezoelectric membrane to obtain a first material; placing the first material in an organic alkali solution and subjecting it to ultrasound to obtain a second material; and drying the second material to obtain the cellulose piezoelectric membrane. This invention uses renewable waste fruit and vegetable peels as raw materials and obtains the membrane through organic alkali-assisted ultrasonic vibration technology. Under the synergistic effect of a mild organic alkali and ultrasound, localized glycosidic bond breakage and preferential hydrolysis occur in the hemicellulose and amorphous regions of cellulose in the fruit and vegetable peels, achieving microstructural reorganization. This significantly improves crystallinity, resulting in a more orderly stacking of elongated crystalline fibers within the cellulose layers and an increased number of asymmetric dipoles. This achieves controllable crystalline region strengthening and structural optimization, greatly activating the piezoelectric effect of the cellulose piezoelectric membrane and enhancing the sensor's sensitivity.

This invention belongs to the field of inorganic nanofiber materials technology, specifically relating to a highly flexible boron nanofiber (BN) ceramic nanofiber and its preparation method. Using boric acid and melamine as main raw materials, this invention prepares the nanofiber through a complexation reaction, solution preparation, electrospinning, and heat treatment. The raw materials are inexpensive, the process is simple, and it is easy to scale up production. By heating the electrospinning needle at 90-120℃, the viscosity of the precursor needle tip is reduced, preventing premature crystallization of the complex and completely solving the needle clogging problem, ensuring continuous and stable spinning, and improving spinning efficiency and fiber quality. The resulting BN nanofibers are continuous, have uniform diameter, and a smooth surface. The controllable transformation from amorphous BN to highly crystalline hexagonal boron nitride can be achieved by adjusting the heat treatment temperature. The amorphous BN nanofiber felt has extremely low thermal conductivity (≤0.029 W / (m·K)) and excellent compression resilience, making it suitable as a reinforcement for composite materials or directly applicable in high-temperature filtration, high-efficiency heat insulation, and catalyst carriers.