236results about How to "Thin diameter" patented technology

The invention discloses an air jet assisting multi-needle electrostatic spinning device which comprises a spinneret plate with the air jet assisting function. Multiple metal needles are arranged on the spinneret plate. The head ends of all the metal needles are connected in series through a wire. The wire is connected with the positive electrode of a direct-current high-pressure generator. The tail end of each metal needle is connected with an injector through a liquid guide pipe. The injector is driven through a micro-injection pump. A receiving device is arranged below the spinneret plate and connected with the negative electrode of the direct-current high-pressure generator. By the adoption of the air jet assisting multi-needle electrostatic spinning device, the spinneret plate with the multiple needles serves as a spinning module, on the basis, the air jet assisting function is added to increase the volatilizing speed of a spinning solvent, accelerate jet flow solidification and increase the operation speed, so that the yield of unit time of nanofibers is increased, the fibers are stretched to a certain degree through jet air flow, and the nanofibers with the smaller diameter can be acquired.

The invention discloses a preparation method of a one-way wet conduction nano-fiber multilayer composite membrane with the wettability gradient. The method comprises the following steps that hydrophilic nano materials are dispersed in solvent, the nano materials are dispersed uniformly through ultrasound, a hydrophilic polymer is dissolved in the dispersing agent, a spinning solution A1 is obtained, and a hydrophilic nano-fiber membrane is deposited on a receiving base material through an electrostatic spinning method; hydrophilic nano materials are dispersed in solvent, the nano materials are dispersed uniformly through the ultrasound, a hydrophilic polymer is dissolved in the dispersing agent, and a spinning solution A2 is obtained; a hydrophobic polymer is dissolved in solvent, and a spinning solution B1 is obtained; the two spinning solutions are deposited on the hydrophilic nano-fiber membrane to form at least one diversion layer through the electrostatic spinning method; a hydrophobic polymer is dissolved in solvent, a spinning solution B2 is obtained, a hydrophobic nano-fiber membrane is deposited on the diversion layers through the electrostatic spinning method, and the one-way wet conduction nano-fiber multilayer composite membrane with the wettability gradient is obtained.

The invention relates to a device and a method for manufacturing an airflow melting electrostatic spinning nano-fiber non-woven fabric. The device for manufacturing the airflow melting electrostatic spinning nano-fiber non-woven fabric comprises a stock hoper, a screw extruder, a filter, a metering pump, a material path, a melt-blown die head, a hot-air pipeline, an air compressor, a heating device, a high voltage electrostatic generator and a receiving device. The material path is made of high thermal conductivity insulating ceramics. The method for manufacturing the nano-fiber non-woven fabric adopts the device disclosed by the invention and comprises the following processing steps: (1) preparing a polymer melt; (2) jetting nano-fibers by using airflow static electricity; and (3) moulding the non-woven fabric. The method for manufacturing the nano-fiber non-woven fabric of the invention adopts airflow-melting electrostatic spinning technology, avoids a problem of pollution of electrostatic spinning solvent, and is novel environment-friendly non-woven fabric manufacturing technology. In the manufacturing method, high voltage electrostatic is directly acted on the melt-blown die head; the melt has high and uniform charge; and simultaneously by utilizing drafting of the airflow, the prepared nano-fiber has the advantages of thin diameter and narrow distribution. The device can meet production requirements by improving the conventional melt-blown manufacturing device, and has low implementation cost and easy industrialization promotion.

A device for UV curing a coating or printed ink on an workpiece such as an optical fiber comprises dual elliptical reflectors arranged to have a co-located focus. The workpiece is centered at the co-located focus such that the dual elliptical reflectors are disposed on opposing sides of the workpiece. Two separate light sources are positioned at a second focus of each elliptical reflector, wherein light irradiated from the light sources is substantially concentrated onto the surface of the workpiece at the co-located focus.

A curing device comprises a first elliptic cylindrical reflector and a second elliptic cylindrical reflector, the first elliptic cylindrical reflector and the second elliptic cylindrical reflector arranged to have a co-located focus, and a light source located at a second focus of the first elliptic cylindrical reflector, wherein light emitted from the light source is reflected to the co-located focus from the first elliptic cylindrical reflector and retro-reflected to the co-located focus from the second elliptic cylindrical reflector.

The invention relates to a composite nano fiber filtration material with photocatalysis / anti-bacterial functions and a preparation method of the filtration material. The filtration material comprises a supporting layer and a nano fiber filtration layer which adheres to the surface of the supporting layer, the nano fiber layer is uniformly filled with an photocatalyst and an antibacterial agent, and the preparation method comprises the following steps: 1, preparing a spinning liquid: dispersing a certain amount of the photocatalyst and the antibacterial agent into a solution uniformly to form a dispersion liquid, performing ultrasonic treatment, and adding a high polymer to form a stable and uniform electrostatic spinning solution; 2, performing electrostatic spinning: setting up electrostatic spinning parameters, and performing stretching on the spinning polymer solution at solid metal wire tips for wire production by utilizing an assembled needle head; and 3, performing slight dissolving treatment on the surface of the composite nano fiber filtration material by adopting solvent vapour recovery at a certain releasing speed to obtain the final composite nano fiber filtration material with the photocatalysis / the anti-bacterial functions. The composite nano fiber filtration material effectively solves a problem that the liquid outlet end of a current needle head / spray nozzle used for the electrostatic spinning is easy to block, can be directly used for decomposition of organic pollutants, inactivation of microorganism pathogenes and the like under visible light, and has excellent filtration performance at the same time.

The invention provides a macro preparation method for superfine tellurium nanowires, which comprises the following steps that sodium telluride reacts with a reducer by the action of a polyvinylpyrrolidone pH modifier to obtain a reaction mixture, the reaction mixture is rapidly cooled by cold water to obtain tellurium nanowire mother liquid, and a solvent is added to the tellurium nanowire mother liquid for extraction to obtain the tellurium nanowires. According to the macro preparation method, as the obtained reaction mixture is rapidly cooled by the cold water to prepare the tellurium nanowires, the quality of the tellurium nanowires is more uniform, and the diameters of the tellurium nanowires are smaller. Further, as preparation conditions are optimized, the preparation method facilitates synthesis in large quantity, and is easy to promote and apply.

The invention discloses dispersion strengthening platinum / rhodium10-platinum thermocouple wires, comprising a cathode and an anode; the thermocouple wires are characterized in that the anode contains ingredients according to the following weight percentage: 9.9-10% of rhodium; 0-0.5% of zirconium; 0-0.5% of yttrium; 0-0.5% of calcium; 0-0.5% of lanthanum; 0-0.5% of titanium; the excess is platinum; the cathode contains ingredients according to the following weight percentage: 0-0.5% of zirconium; 0-0.5% of yttrium; 0-0.5% of calcium; 0-0.5% of lanthanum; 0-0.5% of titanium; the excess is platinum. The production method of dispersion strengthening platinum / rhodium10-platinum thermocouple wires comprises mixing ingredients, vacuum melting, placing and rolling, oxidizing, combined machining and drawing forming. The dispersion strengthening platinum / rhodium10-platinum thermocouple wires of the invention enjoy long service life, high adaptive temperature, strong contamination resistance and low use cost.

A tire press includes a sectional type mold which has an annular lower mold section secured to an upper surface of a lower plate, an annular upper mold section disposed under an upper plate which is vertically moveably placed above the lower plate so that the upper mold section moves vertically along with the upper plate, and a side mold section having a plurality of sectors divided along a circumferential direction thereof and located radially outwardly of the lower mold section in an openable and closable manner. Holding segments which hold the sectors are provided on outer peripheral sides of the sectors. The holding segments are placed on the lower plate so as to move forward and away from the center of the annular lower mold section. Guide segments which are engagable with and disengagable from outer peripheral sides of the holding segments are suspended from the upper plate radially outwardly of the upper mold section. First heating means are provided under the lower mold section, second heating means are provided over the upper mold section, and third heating means are provided on the outer peripheral side of the sectors. The engagement of the guide segments with the holding segments causes the holding segments to move forward to close the sectors, thereby setting a green tire in the mold. After applying a pressure into the set green tire to inflate it, the green tire is heated by the heating means to cure it.

An ultrasonic endoscope comprises an insertion portion comprising a distal hard portion which has: an endoscopic observation unit; and an ultrasonic observation unit having ultrasonic transducers arranged circumferentially on an outer circumferential section of the distal hard portion, wherein the ultrasonic observation unit comprises an ultrasonic-wave transmission / reception unit having an tunnel-shaped path which has an inner circumferential surface formed as a backing layer; a distal block is arranged on a distal side in an axial direction of the distal hard portion with respect to a location where the ultrasonic-wave transmission / reception unit is arranged, and distal ends of respective members constituting the endoscopic observation unit are fixed to the distal block; and part of the members which constitute the endoscopic observation unit are fitted so as to be partially protruded from an inside diameter of the tunnel-shaped path toward an outer circumferential side thereof.

The invention discloses a method for manufacturing a vacuum insulation panel core material with high performance and low cost. The method comprises the following steps of: pulping glass fiber cotton which is produced by a centrifuge method; diluting; screening; performing dehydration molding; performing pressure roller sizing; performing vacuum negative pressure dehydration; drying; cooling; and cutting. In the manufacturing method, the glass fiber cotton which is completely produced by the centrifuge method is used as a raw material of the vacuum insulation panel core material with high performance and low cost, the coefficient of thermal conductivity of the produced vacuum insulation panel core is between 0.003 and 0.008 W / m.k, and the coefficient of heat insulation is greatly improved;the thickness of the panel core material is between 0.5 and 30 mm, and the thickness is thinner; and the glass fiber cotton with the diameter of 3.5 to 5 mu m and the length of 5 to 20 mm has low cost and low overall manufacturing cost, and the overall cost of the vacuum insulation panel is lowered.

The invention relates to a device and a method technique for manufacturing melting electrostatic spinning nano-fiber non-woven fabrics. The device for manufacturing the melting electrostatic spinning nano-fiber non-woven fabrics comprises a material storage tank, a screw extruder, a filter, a measuring pump, a material path, a spinning component, a receiving device and a high-voltage electrostatic generator; and the material path is made of high thermal conductivity insulating ceramics. The method for manufacturing the nano-fiber non-woven fabrics adopts the device for manufacturing the same and comprises the following process steps: (1) preparing a polymer melt; (2) jetting nano-fibers; and (3) molding the non-woven fabrics. By adopting a melting electrostatic spinning technique, the method for manufacturing the nano-fiber non-woven fabrics avoids the pollution problem caused by a solution electrostatic spinning solvent, which is a novel environment-friendly technique for manufacturing the non-woven fabric; and the device is reconstructed on the basis of the conventional screw extrusion melting spinning production equipment to meet the requirement on production, has a low implementation cost, and is easy for industrialized popularization.

The invention discloses a manufacturing method for a fibrous membrane of an extremely hydrophobic organic macromolecule chemical compound with an oil-water separation function in the technical field of fibrous membrane manufacturing. The manufacturing method comprises the following steps: synthetizing a copolymer with excellent electrostatic spinnability by regulating the compounding ratio of a monomer and controlling the condition of a suspension polymerization technology and by adjusting and controlling the compositions of a solution, processing parameters and the temperature and humidity conditions of environment, and spinning a copolymer solution into the fibrous membrane with the advantages of uniform and small bore diameters, high porosity, large flux and extremely hydrophobic and oleophylic properties by using an electrostatic spinning technique. The obtained fibrous membrane has the advantages that the specific surface area is large, the patterns are large, the stacking structure is proper, and the fibrous membrane is in a three-dimensional bore channel structure. Compared with an existing polymer-based oil-water separation member, the fibrous membrane has the advantages that the bore channel structure is more reasonable, the separation capacity is stronger, the separation efficiency is higher, the anti-pollution capacity is stronger, the membrane bores are not easy to block, the oil-water selectivity is stronger, the mechanical strength is higher, the flexibility and the temperature resistance are better, the preparation process is shorter, the consumed energy is little, the filtering rate is higher, and the cost is lower, so that the fibrous membrane can better satisfy the requirements of industrial practicality.

The invention relates to a method for preparing an oil absorption material, in particular to a method for preparing a carbon nanofiber aerogel oil absorption material from bacterial cellulose. According to the method, bacterial cellulose aerogel is modified to obtain the carbon nanofiber aerogel oil absorption material. The method comprises the following steps: culturing the bacterial cellulose; preparing the bacterial cellulose aerogel; and preparing the carbon nanofiber aerogel oil absorption material. The method for preparing the carbon nanofiber aerogel from the bacterial cellulose is simple, novel in design, high in environment-friendly biocompatibility and high in absorption efficiency, and the oil absorption material can be recycled for many times. The hydrophobic carbon nanofiber aerogel prepared by the process can widely absorb multiple organic solvents and oil products, and is high in recyclability and selectivity; the absorption rate is up to 50-300 times the self-weight of the hydrophobic carbon nanofiber aerogel.

The invention discloses dispersion strengthening platinum / rhodium13-platinum thermocouple wires, comprising a cathode and an anode; the thermocouple wires are characterized in that the anode contain ingredients according to the following weight percentage: 12.87-13% of rhodium; 0-0.5% of zirconium; 0-0.5% of yttrium; 0-0.5% of calcium; 0-0.5% of lanthanum; 0-0.5% of titanium; the excess is platinum; the cathode contains ingredients according to the following weight percentage: 0-0.5% of zirconium; 0-0.5% of yttrium; 0-0.5% of calcium; 0-0.5% of lanthanum; 0-0.5% of titanium; the allowance platinum. The production method of dispersion strengthening platinum / rhodium13-platinum thermocouple wires comprise mixing ingredients, vacuum melting, placing and rolling, oxidizing, combined machining and drawing forming. The dispersion strengthening platinum / rhodium13-platinum thermocouple wires of the invention enjoy long service life, high adaptive temperature, strong contamination resistance and low use cost.

The invention belongs to the field of preparation of composite materials, and relates to a preparation method of ultrafine fibrous membrane-toughened prepreg of thermoplastic resin with a toughening function. The method comprises the following steps: electrostatically spinning a toughening agent of thermoplastic resin to obtain ultrafine fibers of the thermoplastic resin with diameter of 100-5000nm, and directly spraying the fibers on the surface of a reinforced fiber fabric so as to form a toughening layer consisting of thermoplastic resin fibers which are distributed irregularly and are uniform in surface density on the surface of the fiber fabric; attaching the toughening layer with the fiber fabric to form a whole through a hot rolling process; and then, compounding the fiber fabric product with the toughening function and a prepreg resin base body to prepare the ultrafine fibrous membrane-toughened prepreg product of thermoplastic resin. The preparation method provided by the invention is simple in technical process and easy to implement, and can realize continuous production of high toughness prepreg, thereby greatly improving the production efficiency.

The invention discloses a method for preparing an acetylation-modified bacterial cellulose aerogel oil-absorbent material and relates to a method for preparing an oil-absorbent material. The invention aims to provide a method for preparing an acetylation-modified bacterial cellulose aerogel oil-absorbent material and the novel oil absorbent material is prepared by carrying out acetylation surface modification on the bacterial cellulose aerogel. The preparation method comprises the following steps of firstly culturing the bacterial cellulose; secondly, acetylating the bacterial cellulose microfibrils; and thirdly, preparing the hydrophobic acetylated bacterial cellulose aerogel. The acetylation-modified bacterial cellulose aerogel oil-absorbent material provided by the invention has the advantages of simple preparation method, novel design, environment friendliness, good biocompatibility and reusability and high absorption efficiency. The oil-absorbent material has very high affinity to oil, no absorption capability to water, good phase selectivity, can absorb leaked and spilled oil and organic solvents in water and can be used as an oil-water separation material. The oil-absorbent material is easily biodegradable and causes almost no pollution to the water body.

The invention relates to a preparation method of carbon nanofibers and particularly relates to a preparation method of polyacrylonitrile-based carbon nanofibers. The preparation method comprises the following steps: dissolving polyacrylonitrile into a solvent to form a spinning solution, supplying the spinning solution to a spinning die head with a series of spinning holes, and extruding from the spinning holes to form fine spinning solution flow; blowing and extruding the fine spinning solution flow by utilizing one high-speed jet air flow at an included angle being 0-30 degrees, thus refining the fine solution flow and promoting the evaporation of the solvent to form polyacrylonitrile nanofibers, wherein the temperature of the high-speed jet air flow is 20-80 DEG C, and the speed of the high-speed jet air flow is higher than the extruding speed of the fine solution flow by 500-3000 times; and arranging the polyacrylonitrile nanofibers in air atmosphere being 160-300 DEG C to conduct pre-oxidization treatment and conduct carbonization treatment in the nitrogen atmosphere being 900-1800 DEG C to obtain the carbon nanofibers. The preparation method has the advantages of high production efficiency, simple process, uniform diameter distribution of fibers and the like, and is suitable for large-scale production.

The invention discloses a method for preparing a carbon fiber reinforced thermoplastic composite material, which comprises the following steps: 1)alternatively paving carbon fiber and thermoplastic resin in a die, wherein a bottom layer and a top layer of the die are thermoplastic resin, closing the die and applying pressure; 2)accessing power supply to a carbon fiber layer, rapidly heating under current effect, when the temperature is higher than the melting point of thermoplastic resin, fusing thermoplastic resin, dipping carbon fiber under pressure; and 3)breaking power, cooling the die, and then opening the die to obtain the carbon fiber reinforced thermoplastic composite material. The method takes carbon fiber as a heat-generating body, the electrothermal conversion efficiency can reach as high as more than 90%, and the energy saving effect is obvious; simultaneously, carbon fiber is capable of melting thermoplastic resin and completing dipping, and has the advantages of short moulding time and good dipping effect, formation of good cross section of thermoplastic resin and fiber can be realized, composite material performance is increased, and processing of product with large thickness can be realized in short time.

A spinning apparatus comprising one or more exits for extruding liquid, and an exit for ejecting gas, located upstream of the exits for extruding liquid, wherein the apparatus comprises a columnar hollow for liquid, in which the exit for extruding liquid forms one end of the columnar hollow; the apparatus comprises a columnar hollow for gas having the exit for ejecting gas; a virtual column for liquid, extended from the columnar hollow for liquid, is adjacent to a virtual column for gas, extended from the columnar hollow for gas; the central axis of the columnar hollow for liquid is parallel to the central axis of the columnar hollow for gas; and there exists only one straight line having the shortest distance between an outer boundary of the cross-section of the columnar hollow for gas and an outer boundary of the cross-section of the columnar hollow for liquid, is disclosed.

The invention discloses a centrifugal gas-electric spinning device by utilizing a negative-pressure array. The centrifugal gas-electric spinning device comprises a high-voltage alternating-current generator, an air supply device, a box body, a centrifugal sprayer, a centrifugal driving mechanism and negative-pressure receiving devices. The interior of the centrifugal sprayer is provided with a liquid storage cavity. Filament outlet holes are arranged in the centrifugal sprayer. Each negative-pressure receiving device comprises a collector, a negative-pressure pipe and a negative air-pressure generator. Negative-pressure pipe openings are formed by negative-pressure pipes in the bottom of the box body. Collectors are nested into the negative-pressure pipe openings. The multiple negative-pressure receiving devices are arrayed in an annular array with the centrifugal sprayer as the center. The high-voltage alternating-current generator is formed for generating an electric field. Airflow spraying out of the filament outlet holes is formed by the air supply device. The centrifugal gas-electric spinning device by utilizing the negative-pressure array has following beneficial effects: nanofibers are formed by sprayed polymers under airflow, an electric field, negative pressure and centrifugal force such that a three-dimensional structure is formed by nanofibers on the negative-pressure receiving devices; thickness of fiber disposition is increased; biological materials are better compatible and the application scope of technology materials is broad; and a support structure obtained is beneficial for cell growth of tissue engineering.

A cable assembly for an electrosurgical pencil comprises a power and signal transmitting multiple-core cable with an attachment plug, in which the power transmitting core has more conductors and thicker insulation than the two signal transmitting cores. The attachment plug has plastic plug-pins with spring-steel strips, or has metal plug-pins with recesses on the plug body near the plug-pins, to increase the flexibility to mate with any loose or tight socket. The cable assembly of this invention is cheaper in cost, lighter in weight, thinner in outside diameter, more flexible in total length and provides a more stable plug-socket connection.

A preparation method of a magnetic bacteria cellulose aerogel oil absorption material, and relates to a method for preparing an oil absorption material. The aim of the invention is to provide the preparation method of the magnetic bacteria cellulose aerogel oil absorption material. A bacterial cellulose aerogel is modified into a carbon nanometer fiber aerogel oil absorption material, and magnetic particles are added to the prepared aerogel, so that magnetic substances can be conveniently used for salvage and recovery after oil absorption and are beneficial to collecting. The method comprises the steps as follows: 1, cultivation of bacterial cellulose; 2, preparation of bacterial cellulose aerogel; 3, preparation of the carbon nano fiber aerogel absorption material; and 4, preparation of the magnetic carbon nanofiber aerogel oil absorption material. The invention prepares magnetic carbon nanofiber aerogel from bacterial cellulose, the preparation method is simple, novel in design and environment-friendly, and has good biocompatibility, high absorption efficiency and convenience for fishing, and can be reused for many times.

The invention discloses a test method for bonding strength of chopped ultrafine organic fiber and a cement-based composite interface. The method comprises steps as follows: fiber is bonded on a sample loading cuboid, and a part of the lower end of the fiber is exposed; a mold is prepared, uniformly stirred cement-based materials are poured into the mold and compacted, the surface is flattened, and a cement matrix is obtained; the exposed end of the fiber is perpendicularly inserted into the cement matrix; after the cement matrix is cured to a test age, the sample loading cuboid is removed, and a free end of the fiber is exposed; an instant adhesive is bonded to the free end of the fiber and is congealed to form small balls; the fiber is tested on a monofilament stretching machine, the stretching speed is controlled, the fiber is pulled out of the cement matrix, and a load displacement curve is obtained; the bonding strength of the fiber and the cement-based composite interface is calculated. The exposed length of the fiber is controlled in advance, and the embedded length of the fiber in the cement matrix can be controlled precisely; requirements for the length and the diameter of the fiber are low, and the test method can be used for testing longer and thinner fiber; a tested sample is not required to be cut, and the testing result is more accurate.

A preparation method of an organic-inorganic hybrid super hydrophobic modified bacterial cellulose aerogel oil absorption material relates to a preparation method of an oil absorption material. The invention aims to provide the preparation method of the organic-inorganic hybrid super hydrophobic modified bacterial cellulose aerogel oil absorption material. The bacterial cellulose aerogel is subjected to organic-inorganic hybrid super hydrophobic modification to obtain the super hydrophobic aerogel oil absorption material. The method comprises the steps as follows: 1, bacterial cellulose cultivation; 2, bacterial cellulose aerogel preparation; and 3, preparation of the organic-inorganic hybrid super hydrophobic modified bacterial cellulose aerogel. The oil absorption material prepared by the invention has good selective oil absorption performance, can be conveniently used for oil-water separation or absorption of the oil spill in the water, has no pollution to the water body, and is a novel oil absorption material with great application potential.

The invention discloses a preparation method and device for a three-dimensional support for spinning by utilizing gas-electro spinning based on negative-pressure collection. A device comprises an alternating-current high-voltage generator, a liquid supply device, a gas liquid device, a coaxial sprayer and a negative-pressure collecting device. The coaxial sprayer is provided with a liquid outlet and a gas outlet. The gas supply device is used for conveying a spinning solution or melts to the coaxial sprayer and enabling melts to flow out of the liquid outlet. The gas liquid device can generate air flow blowing from the liquid outlet to the negative-pressure collecting device via the liquid outlet. The alternating-current high-voltage generator can form an alternating electric field between the coaxial sprayer and the negative-pressure collecting device. The negative-pressure collecting device comprises a collector, a negative-pressure pipe and a negative-pressure generator. The spinning solution or melts form solution jet flow or melt jet flow in the coaxial sprayer and the collector under effect of airflow and the alternating electric field.The preparation method and device for the three-dimensional support for spinning by utilizing gas-electro spinning based on negative-pressure collection have following beneficial effects: by adoption of spinning technology based on the negative-pressure collector, the nanofiber three-dimensional support featuring a broad range of preparation material, small fiber diameters, uniformly-distributed filament diameters, a loose structure, great thickness and superior mechanical properties is obtained and has great technological universality.

The invention provides a sampler for sediment pore water sampling in rivers or lakes. The lower end of a sampling tube is fixedly connected with a conical head, an internal thread port is arranged at the upper end of the sampling tube, and a screen mesh area is arranged at the lower part of the sampling tube. The sampling tube inner the screen mesh area is provided with line cutting seams. The sampling tube outer wall in the screen mesh area is covered with stainless steel screen meshes, and the lower end of a T- shaped handle is plugged in the upper end of the sampling tube. The pore water sampler has a maximum sampling depth of 3.5 m relative to the maximum sampling depth of the common interstitial water sampler of about 80-100 cm, so that comprehensiveness of pore water sampling investigation work of the bottom sediments in the rivers or lakes can be improved. Through use of the sampler, disturbance on the pore water is smaller, undisturbedness of the pore water of the bottom sediments in different depth of the rivers or lakes can be greatly maintained, and the accuracy of the sample analysis of the pore water of the sediments can be improved. The sampler has the advantages of small and exquisite volume, simple operation and adjustable sampling depth.

The invention discloses a preparation method of chalcogenide glass tapered fibers. Chalcogenide glass fibers are tapered by the aid of accurate temperature control of a specific electric-heating coil and traction of a precision stepping motor, important parameters such as taper zone lengths, taper zone outer diameters and the like of the tapered fibers are controlled through control on the heating temperature and the tapering traction speed, and the chalcogenide glass tapered fibers with different taper zone lengths and taper zone outer diameters are drawn accurately. The method is simple in technology, high in operability, good in repeatability and high in accuracy and can effectively solve problems that the chalcogenide glass fibers are broken easily during tapering, fiber core diameters and taper zone lengths are difficult to control accurately and the like, the fiber core diameters of the prepared chalcogenide glass tapered fibers with nanoscale or submicron diameters range from 700 mu m to 1,000 mu m, the taper zone lengths range from 3 cm to 7 cm, the production cycle is short, the success rate is high, the chalcogenide glass tapered fibers can be applied to new technical fields of coupling of micro-waveguides, generation of super-continuum spectrum and the like, and research and application fields of the chalcogenide glass tapered fibers are greatly extended.

The invention discloses a preparation method of titanium dioxide fibers with a photocatalysis function and a polycrystalline nanostructure. The preparation method comprises the following steps: respectively diluting titanium tetrachloride and potassium acetate, which are taken as raw materials, in ethanol, mixing at 0-10 DEG C under the condition of stirring to generate titanium acetate and potassium chloride, filtering to remove potassium chloride by taking advantage of the property that potassium chloride is insoluble to ethanol so as to acquire filtrate of ethanol in which titanium acetateis dissolved, concentrating the filtrate to obtain a titanium acetate sol spinning solution, centrifuging and spinning to obtain precursor fibers, and performing steam activation thermal treatment toobtain the titanium dioxide fibers. The preparation method disclosed by the invention has the advantages of lower raw material cost, simpler sol production process and pollution-free preparation process.