3781 results about "Micro nano" patented technology

The invention provides a friction generator. The friction generator comprises two electrodes; the electrode comprises a macromolecular polymer insulating layer; a micro-nano concave-convex structure is arranged on one side surface of the macromolecular polymer insulating layer, and a metal film is arranged on the other side surface; the surface of the electrode micro-nano concave-convex structure of one insulating layer is directly attached to the surface of the electrode micro-nano concave-convex structure of the other insulating layer, and the two are fixedly connected through the outer edge; and the metal film is an electrode for outputting voltage and current of the friction generator. The invention provides a novel and effective method for obtaining energy by use of the friction effect. The friction generator generates electric energy by use of the potential change of the internal electrification by friction and the inductive effect of the metal pole plates on the two sides; and the method is simple and efficient and the cost is low.

The invention provides a friction generator, which comprises a first electrode, a second electrode and an intermediate film, wherein the first electrode comprises a first macromoleclar polymer insulation layer of which one side surface is provided with a conductive film; the second electrode comprises a second macromoleclar polymer insulation layer of which one side surface is provided with a conductive film; the intermediate film is fixed on the other side surface of the second macromoleclar polymer insulation layer; the non-fixed surface of the intermediate film is provided with a micro-nano concave-convex structure; the surface of the micro-nano concave-convex structure of the intermediate film on the second electrode and the surface without the conductive film of the first electrode are oppositely fit and are mutually fixedly connected; and the conductive film of the first macromoleclar polymer insulation layer and the conductive film of the second macromoleclar polymer insulation layer are both the voltage and current output electrodes of the friction generator. The invention provides an innovated and effective method by the friction action, and electricity energy is generated by the variation of internal friction electrification electric potential and the induction effect of metal pole plates on two sides. The method is simple and efficient and has low cost.

The invention relates to an aqueous binder which is compounded and modified by micro nano material. The modified aqueous binder of the invention adopts emulsion adhesive as matrix and micro-size and nano-size inorganic powder as modifier to prepare the compound and modified aqueous binder. The method of the invention can not only enhance the interface binding force of the aqueous binder, but also greatly improve the properties of water resistance, toughness and extensibility, leading comprehensive performance of the aqueous binder to be improved.

The invention relates to a wear-resisting super-hydrophobic coating composition as well as a preparation method and application thereof. The composition is prepared from a nano-material dispersion solution and a binding material dispersion solution. The nano-material dispersion solution is prepared by mixing a nanoparticle material, a hydrophobic silane coupling agent and a volatile solvent, wherein nanoparticles form a rough structure with a micro-nano dual scale through a mutual effect of the nanoparticles and the structure is dispersed in the solution of the hydrophobic silane coupling agent; the hydrophobic silane coupling agent has one or more groups and covalent bond connection is formed by the hydrophobic silane coupling agent and the micro-nano dual rough structure; meanwhile, thewear-resisting super-hydrophobic coating composition at least contains one hydrophobic group. A super-hydrophobic coating layer formed by the super-hydrophobic coating composition keeps a long-term effective super-hydrophobic property; the coating composition adopts a binding material so that the binding force between a super-hydrophobic structure and a matrix is enhanced and the protection effectof the coating layer is enhanced; a processing technology of the super-hydrophobic coating layer is simple and convenient and large-area construction is facilitated.

The invention discloses a preparation method for increasing raman activity of a basement in a surface of a large area of a micro-nano tree structure array, which firstly prepares a large area of a silicon micron cylinder array; a nanometer assembling technology is used for producing a nanometer stick in the silicon micron cylinder array. then a three-dimensional ordered periodic micro-nano structure array is obtained; and various appearance of metal nano-particles are embedded into the three-dimensional ordered periodic micro-nano structure array by using a way of a hydro-thermal synthesis method. A SERS activity basement of the invention can achieve homogenization from a centimeter grade to a large area. The invention designs SERS activity hot-particles on the three-dimensional ordered micro-nano structure, and assembles increasing effect of antenna, the increasing effect of metal/semiconductor intersection and the increasing effect of a gap into one body, then high sensitivity of the SERS activity is obtained, and the SERS activity hot-particles is firmly embedded into the tree micro-nano structure, then the invention is not only applicable for a SERS test of trace liquid-phase analyte, but also for the SERS test of trace gaseous-phase analyte.

The invention belongs to the technical field of micro-nano manufacture, and particularly relates to a method for obtaining a graphene micro-nano structure by using graphene oxide as a raw material and utilizing a laser processing technology, which comprises the following steps of: firstly preparing a graphene oxide film on a substrate, and then building a laser micro-nano processing system for carrying out laser micro-nano processing for the graphene oxide to obtain the grapheme micro-nano structure on the substrate. The method has the following advantages: the method can prepare the micro-nano structure with various patterns easily; a three-dimensional structure can be realized by utilizing point-by-point processing; the conducting capability of the micro-nano manufacture can be regulated and controlled through controlling the reduction degree of a graphene material, and the reduction degree can be changed by changing laser processing power; and the adjustment of the graphene structure can be realized through the change of a processing atmosphere.

The invention relates to a medium-high temperature (120-1000 DEG C or higher) composite structural heat storage material. The medium-high temperature composite structural heat storage material comprises an inorganic salt phase change latent heat material, a sensitive heat storage material and a heat conduction reinforcing material, wherein the mass ratio of the inorganic salt phase change latent heat material to the sensitive heat storage material is of 1: (0.1-10); and the heat conduction reinforcing material is of 0.0001-1kg/ (kg heat storage material) based on mass ratio. The preparation method comprises steps as follows: uniformly mixing the inorganic salt phase change latent heat material with the sensitive heat storage material and the heat conduction reinforcing material; pressurizing to form green blank; and then heating and sintering, so as to obtain the medium-high temperature composite structural heat storage material. The medium-high temperature composite structural heat storage material provided by the invention is capable of obviously reducing the corrosion resistance of the sensitive heat storage material; meanwhile, the thermal conductivity of the composite heat storage material is markedly improved by virtue of the micro-nano doping of the heat conduction reinforcing material; and moreover, high heat storage density is achieved, and wide application prospect is provided.

The invention relates to the technical field of micro-structural surface preparation and laser micro-processing, and in particular provides a method for preparing a micro-nano composite texturing cutting tool by using femtosecond laser. In the method, micro-nano texturing and micro/nano composite texturing preparation is performed on the cutting tool surface by utilizing the unique interaction property between femtosecond laser and materials, the operation is simple, and the accuracy can be controlled. The preparation of micro/nano composite texture can be performed on a coated cutting tool by adopting a coated surface direct texturing method or a two-step composite texturing method. The method overcomes the defect of singleness of texturing only in micron scale in the conventional cutting tool texturing technology, and can further improve the abrasion resistance of the cutting tool, and prolong the service life of the cutting tool.

The invention relates to a preparation method of a super-hydrophobic cellulose material with a micro-nano structure. The method comprises the following steps: (1) adding ethyl orthosilicate and functionalized siloxane into an ethanol system containing deionized water to obtain a dispersion liquid of functionalized silica particles A in the presence of ammonium hydroxide serving as a catalyst; with the dispersion liquid of functionalized silica particles A as seeds, sequentially adding the ethyl orthosilicate, the functionalized siloxane, the deionized water, the ammonium hydroxide and the ethanol so as to obtain a dispersion liquid of functionalized silica particles B; (2) performing ultrasonic dispersion on the two types of functionalized silica particles in dimethylformamide, then adding a hydrophobic polymer and a low surface energy additive into the system and evenly stirring so as to form white dispersion liquid; and (3) coating the white dispersion liquid obtained in the step (2) on a natural cellulose material in a direct spraying manner or a spin coating manner so as to obtain the super-hydrophobic cellulose material with the micro-nano structure. The coating material has strong scouring resistance and acid-alkali resistance besides the excellent hydrophobic property.

The invention relates to the technology of metal material surface modification, in particular to a production method of bionic superhydrophobic surface of an aluminum alloy base, and aims to improve hydrophobicity of the aluminum alloy surface. The production method includes: pre-processing, namely washing aluminum alloy with absolute ethyl alcohol; subjecting the surface of the aluminum alloy to laser processing to obtain a plurality of micro-scale crater structures on the surface of a sample; immersing the sample in chemical etching solution to change morphology features of the surface of the sample, keep the surface to contain chemical elements different from the base, and form micro-nano double-layer hierarchical structure on the surface of the aluminum alloy; and after reaction, placing the chemically etched aluminum alloy sample in DTS-bearing (dodecyltrichlorosilane-bearing) toluene solution for modification so that a low surface energy film gradually forms on the surface. Therefore, the surface of the aluminum alloy in the micro-nano double-layer hierarchical structure has typical biological super-hydrophobicity and has typical petal-effect adhesion.

The invention discloses a transparent super-hydrophobic coating material. The raw materials of the transparent super-hydrophobic coating material comprise gas-phase silica nano-particle dispersion liquid which consists of gas-phase silica nano-particles and a solvent, and a hydrophobic treating agent. The invention further discloses a preparation method of a transparent super-hydrophobic coating; a coating of a micro-nano structure is prepared by rubbing and coating a substrate with the gas-phase silica nano-particle dispersion liquid, and then the coating is subjected to surface hydrophobization treatment by the hydrophobic treating agent to obtain the transparent super-hydrophobic coating. According to the super-hydrophobic coating material provided by the invention, hydrophobization treatment manners can be changed flexibly according to the difference of coated substrates; the method for preparing the super-hydrophobic coating has low requirement on equipment; the using cost is extremely low; the method is simple; the coating application is convenient; a large-area high-efficiency super-hydrophobic coating can be prepared; the prepared super-hydrophobic has excellent super-hydrophobicity, high transparency, droplet impact resistance, temperature and pH stability, durability, and repeated rubbing and coating capacity, and can be applied to almost all currently known solid surfaces.

The invention provides a powder metallurgy preparation method for a nano-particle reinforced ultra-fine grain metal-matrix composite. According to the method, a metal-matrix grain refining process and a nano-particle dispersing process are carried out in steps. The method comprises the steps that firstly, micro-nano flaky metal-matrix powder is prepared in advance; nano-particles and the flaky metal-matrix powder are stirred and mixed in a stirrer at the high speed under protective atmosphere, and by means of high shear force and pressure generated between stirring blades and a tank body, the nano-particles are uniformly dispersed to the surface of the micro-nano flaky metal-matrix powder; through short-time mechanical ball-milling treatment, the nano metal particles are embedded into the micro-nano flaky metal-matrix powder, so that composite powder of nano-particle reinforced metal is obtained; and compression moulding, sintering and compacting treatment are conducted, so that the ultra-fine grain metal-matrix composite with the nano-particles uniformly dispersed is obtained. By means of the powder metallurgy preparation method, time and energy are saved; cost is low; the application range is wide; and the prepared material is high in comprehensive mechanical performance and has large-scale application potential.

The invention provides a compound antimicrobial and a preparation method thereof. The compound antimicrobial comprises micro-nano particles and guanidine polymers by the weight ratio of 1:1 to 1:50, wherein the micro-nano particles at least have the one-dimensional average dimension of 1nm to 1000 mu m; the guanidine polymers are coated on the surfaces of the micro-nano particles and/or embedded in holes or among layers of the micro-nano particles; inorganic or organic particles comprising micro-nano particles are added to a solution of the guanidine polymers; organic alkali is added or not added; the particles and the solution are uniformly mixed and dried for obtaining the compound antimicrobial. When applied to plastics, fibers and rubber, the antimicrobial has high sterilization efficiency, also largely reduces the processing cost of antibacterial materials, and has simple and convenient preparation method.

The invention relates to an organic and inorganic hybrid perovskite-based solar cell and a method for manufacturing the same. The organic and inorganic hybrid perovskite-based solar cell comprises a substrate, a transparent electrode, an electron transport layer, an ultrathin orientation layer, a perovskite light absorption layer, a hole transport layer and a counter electrode. The transparent electrode, the electron transport layer, the ultrathin orientation layer, the perovskite light absorption layer, the hole transport layer and the counter electrode are sequentially stacked on the substrate. The method includes modifying micro-nano structures on the surfaces of the electron transport layer or the hole transport layer to form the ultrathin orientation layer before the perovskite light absorption layer is manufactured by the aid of a liquid phase process. The organic and inorganic hybrid perovskite-based solar cell and the method have the advantages that orientated growth of crystals of perovskite is controlled under large-ring structural effects of molecules in the ultrathin orientation layer, accordingly, the crystallization regularity can be improved, and internal defects can be reduced; the diffusion lengths of current carriers inside the perovskite light absorption layer can be effectively increased, accordingly, recombination of electron-hole pairs on the inside and interfaces of the perovskite light absorption layer can be prevented, and the photoelectric conversion efficiency and the stability of the cell can be obviously improved; the crystallization quality of the perovskite light absorption layer cannot be easily affected by film forming conditions under the orientation mold plate effects of the ultrathin orientation layer, accordingly, the device manufacturing repeatability can be improved, and the low-temperature solution method is applicable to industrially producing large-area perovskite solar cells.

The invention relates to a water-based drilling fluid of a shale gas horizontal well reinforced well wall and an application thereof. The water-based drilling fluid comprises, by weight, 100 parts of water, 0-5 parts of clay, 0.5-3 parts of micro-nano particle blocking agents, 0.5-3 parts of chemical blocking agents, 0.1-2 parts of tackifier, 1-5 parts offiltrate reducer, 0.05-2 parts of encapsulating inhibiting agents, 0.1-3 parts of polyamine inhibiting agents, 1-5 parts of lubricant, 0.1-1 part of alkalinity regulator, 2-25 parts of inorganic salt, and 0-200 parts of weighting agents. The micro-nano particle blocking agents and the chemical blocking agents in the water-based drilling fluid of the shale gas horizontal well reinforced well wall have the effect of reinforcing the well wall in a cooperative mode, can effectively block micropore seams of shale to hinder pressure transmission, can further obviously improve the membrane efficiency of the shale, and facilitates the balance anti-collapse function of chemical activity.

The invention discloses a 3D laser printing method and system. A four-parameter continuous modulation laser printout method is adopted to prepare a 3D image consisting of diffraction pixels arranged according to the position coordinates and provided with both a specific grating space frequency and an angle of orientation; the modulation method of parameters of grating stripes in the diffraction pixels is realized on the basis of a 4F imaging system and a diffraction grating; the 4F imaging system comprises a first Fourier transformation lens or lens group and a second Fourier transformation lens or lens group; the diffraction grating is placed between the first Fourier transformation lens or lens group and the second Fourier transformation lens or lens group; the distance between the diffraction grating and the first Fourier transformation lens or lens group is changed to realize continuous modulation of the space frequency of the grating stripes; and the diffraction grating is rotated to realize continuous modulation of the grating orientation angle of the grating stripes. The 3D laser printing method and system realize continuous adjustment of the space frequency and the orientation of the grating, and encodes on the basis of the four-parameter micro-nano structure with continuously changeable space frequency and orientation of the grating to form a 3D color image.

The present invention provides an organic light-emitting diode display substrate, a manufacturing method therefore, and a display device thereof. The organic light-emitting diode display substrate comprises a substrate, an organic light-emitting diode device located on the substrate and a film encapsulation layer. The film encapsulation layer is configured to package the organic light-emitting diode device, and includes at least one inorganic thin layer and at least one organic thin layer which are mutually and alternatively arranged and a hydrophobic retaining wall with a micro-nano structure arranged on the substrate and located at the periphery of the film encapsulation layer. The hydrophobic retaining wall is formed prior to formation of the organic thin layer, and is able to block the fluidity of the ink used for ink-jet printing when a printing technology is employed to prepare the organic thin layer so as to restrict the climbing distance of the organic thin layer and provide technology guarantee for the narrow-edge framing of displaying products of a soft organic light-emitting diode.

The invention provides a powder metallurgy preparation method of a carbon nanotube reinforced aluminum alloy composite material. The method comprises the following steps: pre-preparing micro-nano flake powder of an alloying component, subsequently ball-milling the powder with a carbon nanotube and spherical pure aluminum powder to prepare flake composite powder, and further performing densifying, sintering, thermal deformation processing and thermal treatment to achieve alloying so as to finally obtain the carbon nanotube reinforced aluminum alloy composite material. Uniform compounding of the matrix aluminum powder, the carbon nanotube and the alloying component can be achieved through limited ball-milling, and meanwhile dangerous elements or uneasy grinding elements such as magnesium and silicon which are high in activity and likely to combust and explode are avoided by adopting the stable and easily ground pre-alloying aluminum powder, so that the security and the reliability are improved; in addition, because of large interlayer boundary and small layer thickness distance, the flake structure is beneficial for uniformly dispersing the alloying component and forming refined dispersed separated phase. The method is beneficial for bringing the effects of composite reinforcement of carbon nanotubes and alloy reinforcement into play to the maximum extent, is energy-saving and time-saving, and is safe and feasible.

The invention discloses a preparation method of straw micro-nano cellulose, relating to a preparation method of micro-nano cellulose. The invention solves the problems that the prior art for preparing nano cellulose comprises more steps, and rodlike nano cellulose has low draw ratio. The preparation method is as follows: 1, stewing; 2, dipping and washing; 3, screening; 4, bleaching; 5, carrying out hydrolysis and supersonic treatment; and 6, neutralizing, rinsing, breaking, decentralizing and drying to obtain the straw micro-nano cellulose. The micro-nano cellulose prepared by the preparation method of the invention has fibroid appearance, has the diameter of 10-200 nm and the length of 200-10 mu m, and has high draw ratio and large specific surface area. The invention is applied to the field of composite materials.

The invention discloses a high-resolution biosensor. Specifically, a basic unit consisting of a first insulating layer, a nanometer functional layer and a second insulating layer is provided with a nano-pore in the center, thus forming a nanometer functional layer unit. A first electrophoresis electrode or micropump, a first store room, a second store room, a second electrophoresis electrode or micropump, and a micro-nanometer separation channel constitute a micro-nanometer fluid device unit. The nanometer functional layer unit, a source electrode, a drain electrode, a dielectric layer and a gate electrode compose a field effect transistor unit. When a biomolecule passes through the nano-pore in the micro-nanometer fluid device and interacts with the nanometer functional layer, the field effect transistor unit measures the field effect characteristic change resulted from the interaction, thus reaching the purpose of biomolecule detection. The invention provides a solution to the technical difficulty of integrating the nano-pore in the nanometer functional layer, and can control the form change when a biomolecule passes through the nano-pore, thus meeting the resolution requirements for detecting the biomolecule characteristic and structure. In addition, the manufacturing method of the sensor is simple.

The invention relates to a hybrid frequency-driven three-dimensional ellipse turning method, which belongs to the technical field of micro-nano ultraprecision cutting of free-form surfaces and cutting of materials difficult to machine. The method comprises the following steps of: driving a diamond cutter by using three piezoelectric stacking actuators along an X-axis direction, a Y-axis direction and a Z-axis direction respectively; applying a group of hybrid frequency driving signals onto each piezoelectric stacking actuator, wherein the hybrid frequency driving signal mainly comprises two components of which one is a sine wave signal for producing three-dimensional ellipse cutting and the other is a fast cutter servo signal for turning the generative free-form surfaces; matching amplitudes and phases of the three sine wave signals to make the diamond cutter produce three-dimensional ellipse turning movement at cutter position points; and driving the three piezoelectric stacking actuators to produce required fast cutter servo movement according to the disturbance components of projection components of a diamond cutter position point track on each coordinate axis respectively. The two kinds of turning movement can be independently controlled and optimized, so the method provided by the invention is simple, convenient and easy to implement.

The invention relates to a method for preparing multifunctional three-layer core-shell structure micro/nano particles. The particles are of spherical structures, the thickness of each shell layer is controllable, multiple materials or medicines having different properties can be effectively and independently coated simultaneously, multifunctional characteristic compounding can be realized by adding functional auxiliary materials into each phase, the advantages of multilayer core-shell structures and excellent optical, electrical, magnetic, acoustic and biological characteristics are integrated into a whole, drug controlled release and medical contrast imaging application can be realized, and particularly the core-shell structure has excellent application prospects in the aspects of disease treatment and medical imaging. The preparation method is a coaxial electrostatic spraying method, the process and equipment are simple, the generated particles are controllable in forms, the particle size, shape and core-shell thickness of the obtained core-shell structure particles can be controlled by changing the operating parameters, the particle size is uniform, and the core-shell structure has good application prospects. In addition, the core-shell structure particles can serve as a precursor for preparing a hollow and special ring structure.

The invention relates to an in-situ pull/press-torque combined load material micromechanics test platform and belongs to the field of material mechanics tests. The in-situ pull/press-torque combined load material micromechanics test platform consists of a base, a precise loading unit, a detection control unit and a clamping and connecting unit, wherein the precise loading unit comprises a torque loading unit and a pull-press loading unit and can be used for realizing the independent and combined loading of pull-press loads and torque loads; aiming at the pull-press loads and the torque loads, the detection control unit respectively uses a pull pressure sensor and a torque sensor to perform load detection and is combined with a contact-type capacitance displacement sensor, a circular grating ruler and a photoelectric encoder so as to monitor and control a loading mechanism. The in-situ pull/press-torque combined load material micromechanics test platform is compact in structure, small in size and controllable in strain rate, and can be used for performing in-situ monitoring on microtexture structural changes, deformation damage mechanisms and performance evolution laws of a material under the action of the combined load, so that an effective test method for revealing the nanoscale mechanics characteristics and damage mechanisms of the material under an approximate service condition is provided.

The invention discloses an ice coating prevention surface of a bionic micro-nano composite structure and a preparation method thereof, and belongs to the technical fields of chemistry and materials. The preparation method comprises the steps of: processing a surface micro structure on the surface of a substrate, planting a nano structure on the surface micro structure and finishing the surface toobtain the ice coating prevention surface. The ice coating prevention surface has a micro-nano composite structure, thus the surface roughness of the material is greatly increased, the contact area between liquid drops and the surface of the substrate is reduced, and the surface of the substrate not only has hydrophobicity, but also has lower adhesion property; under the condition of -10 DEG C even -15 DEG C, the surface has hydrophobic and anti-icing effects, and the icing time is larger than 7200 seconds; and the ice coating prevention surface can be formed on multiple materials, thus the limit to low-temperature icing prevention of the materials is greatly widened.

The invention relates to the field of micro-electromechanical systems (MEMS) integrated processing and particularly relates to a piezoelectric friction combined type micro-nano generator and a prepared method thereof. A piezoelectric type generator is formed by means of using a piezoelectric film, and a friction-type generator is formed by using a piezoelectric film metal electrode and the difference between other flexible polymer materials and an electric charge binding capacity. Compared with a traditional piezoelectric type generator and a traditional friction-type generator, the piezoelectric friction combined type micro-nano generator combines the piezoelectricity with the friction and uses reasonable external circuit connection modes , so that a capacitance can be charged effectively and voltage output which reaches hectovolt can be provided. The piezoelectric friction combined type micro-nano generator and the prepared method of the piezoelectric friction combined type micro-nano generator is low in cost, high in productivity and simple in process and is provided with high voltage output and strong charging ability. The structure of the generator comprises piezoelectric film, a piezoelectric film electrode, the flexible polymer materials with micro-nano composite structure and a polymer material electrode.

The invention discloses a multi-channel vector holographic polarization multiplexing method based on a birefringent medium metasurface, and belongs to the technical field of micro-nano optics and holographic multiplexing application. The method comprises the following steps that: the metasurface for achieving the holographic polarization multiplexing is composed of nano column arrays with rectangular cross sections and different geometric dimensions and different azimuth angles; by changing the geometric size and azimuth angles of the nano column unit, the phase and polarization state of the emergent light beam are randomly regulated and controlled by the metasurface; holograms corresponding to different mutually independent original images are obtained by using a GS algorithm; according to the obtained holograms, the geometric size and azimuth angles of the nano column unit are determined by coding so as to generate a processing file of a corresponding medium metasurface structure; the metasurface of the transmission-type medium is processed by adopting a micro-nano processing process of electron beam etching; through the selection of the polarization states of the incident lightbeam and emergent light beam, the combination and multiplexing of seven different polarization images of twelve different polarization channels are achieved.

The invention discloses a fluorescent quantum dot micro-nano encapsulated composite material structure. The composite material structure comprises fluorescent quantum dots, a mesoporous particle material with a nano lattice structure, and a barrier layer, wherein the fluorescent quantum dots are distributed in the mesoporous particle material, and the barrier layer coats the external surface of the mesoporous particle material. The composite material structure can effectively retard the aggregation of the quantum dots, and the barrier layer coating the surface prevents the erosion of water and oxygen small molecules and improves the compatibility and stability of composite fluorescent particles, thereby greatly prolonging the service life of the fluorescent quantum dot micro-nano encapsulated composite material.

The invention provides a preparation method of a super-hydrophobic micro-nano structure on a titanium alloy surface. The preparation method comprises the following steps: performing ultrasonic cleaning on a titanium alloy sample respectively with acetone and anhydrous alcohol, to obtain a titanium alloy sample with a clean surface; performing femtosecond laser photoetching processing on the surface of the titanium alloy sample with the clean surface, to obtain the titanium alloy sample with the surface having the super-hydrophobic micro-nano structure in one step, wherein a femtosecond laser beam is fixed and perpendicular to the surface of a processed material, the single pulse energy of the femtosecond laser beam is 100mu J-800mu J, the pulse width is 100fs-500fs, the central wavelength is 500nm-1000nm, the repetition frequency is 500Hz-2kHz, and the size of the etched facula of the femtosecond laser beam is 0.5mum-300mum; the surface of the titanium alloy sample moves relative to the etched facula of the femtosecond laser beam along the three-dimensional directions x, y and z, the motion positioning precision in x and y directions is 50nm-100nm, and the motion positioning precision in z direction is 5nm-10nm.

The invention discloses a skin burn repair material and a preparing method thereof, and belongs to the field of biomedicine. A functional loading substance is added into a polymer to prepare the repair material through the coaxial electrostatic spinning process, and the upper surface layer micro-nano structure is adjusted so that the repair material can resist adhesion of outside microorganisms and bacteria. The prepared repair material containing the functional loading substance with antibacterial, antiphlogistic and repair promoting functions repairs the skin burn area in a targeted mode based on the characteristics of different stages of the burnt skin repair process. The adopted base material has high biocompatibility, secondary damage to the wound region of traditional medical gauze when fresh dressing is changed for a wound is avoided, and secondary infection caused by external factors can be effectively resisted. The skin burn repair material and the preparing method thereof can be effectively applied to biomedicine related fields and have the possibility of extensive clinic application.

The invention relates to a method for selectively preparing or integrating multistage silver micro-nanostructures inside various plane substrates and micro fluidic chip channels by the utilization of the femtosecond laser inducing metallic silver reduction technology. In addition, the silver multistage micro-nanostructure substrate prepared by the method is used as a reinforced substrate for surface-enhanced raman spectroscopy SERS. The method provided by the invention comprises the following steps of: preparing a silver plating solution for femtosecond laser micro-nano machining, establishing a femtosecond laser micro-nano machining system for realizing multi-point scan in the silver plating solution, placing the silver plating solution and the substrate into the femtosecond laser micro-nano machining system and preparing the multistage silver micro-nanostructures on the substrate. According to the invention, a laser beam scans in the silver plating solution along a track designed in advance by a program. The preparation method is independent of the smoothness of the substrate. In particular, the preparation of silver multistage structure SERS substrate can be accomplished on the bottom of the micro fluidic chip channels, thus realizing catalysis and surface-enhanced raman test application.