40results about How to "Adjustable porosity" patented technology

The invention discloses a solid phase microextraction fiber for polycyclic aromatic hydrocarbon enriching detection and a manufacturing method thereof, and belongs to the technical field of contaminant detection. The invention provides a method capable of being used for manufacturing a solid phase microextraction coating on different fiber substrates and realizing combined use with gas chromatography or gas chromatography-mass spectrum, and the method is used for polycyclic aromatic hydrocarbon contaminant detection. Metal fiber is used as a substrate; dopamine is polymerized on the surface ofthe substrate so as to provide functional groups for polydopamine; the polydopamine is firstly combined with COF material single ligands so as to provide an anchor point; a PDA-COP composite layer isfinally synthesized and is used for solid phase microextraction. The solid phase microextraction fiber has the advantages that through the great pi bond effects between the solid phase microextraction fiber and the polycyclic aromatic hydrocarbon, the adsorption effect on the polycyclic aromatic hydrocarbon can be enhanced; during the enrichment, a certain separation effect is achieved; the substrate pretreatment step of samples can be effectively simplified; meanwhile, the enriching capability of the polycyclic aromatic hydrocarbon contaminants can be greatly improved; the detection limit ofthe polycyclic aromatic hydrocarbon contaminants can be reduced.

The invention relates to a beautiful millettia root seed scaled seedling-growing method which comprises seed pre-treatment, accelerating germination, cup filling, seedling-growing and transplanting, wherein the accelerating germination is carried out in a sand bed and the sand bed is prepared by pouring river sand with different mesh numbers which are uniformly mixed according to weight parts into a seedbed to be leveled and disinfected; the cup filling comprises filling a nutritional cup with beautiful millettia root seeds exposing white after accelerating germination, wherein the nutritional cup comprises a cylindrical cup body which is opened at the upper end and is provided with a plurality of square holes at the lower end and a repeatedly used cup tray located below the cup body for supporting the cup body. The beautiful millettia root seed scaled seedling-growing method provided by the invention has the advantages of being neat in germination, robust in seedling, high in seedling success rate, short in seedling time, low in seedling cost and the like.

The invention provides a method for preparing a biological scaffold by 3D printing. The method comprises the steps of grinding allogeneic bones or heterogeneous bones at a low temperature in a freezing grinder to obtain a printing material, modeling 3D printing with the aid of a computer, and then performing post treatment in a genipin solution. The prepared biological scaffold has good biological compatibility, and the bone graft material does not have toxicity, rejection, mutagenicity or antigenicity in vivo, and does not disturb bone and tissue regeneration; the prepared biological scaffold can be gradually degraded and absorbed and replaced by autologous bone tissues, can bear the pressure close to 20MPa with normal bone cortex, and has good initial mechanical properties; and the elastic modulus is gradually reduced, stress shielding is avoided, fracture, collapse and loosening of implants in the long-term healing process are avoided, bone fusion can be accelerated, and the implants can be finally completely converted into autologous bone tissues.

The invention discloses a passivator for treatment of heavy metal pollution of soil. The passivator comprises the following components in parts by weight: 10 to 20 parts of dewatered sludge, 10 to 15parts of lime, 15 to 20 parts of clay minerals, 10 to 15 parts of rot straw slag and 30 to 40 parts of modified biochar. The passivator for treatment of heavy metal pollution of soil prepared in the invention is applicable to soil remediation at heavy metal polluted sites. The main components of the passivator are all natural materials; no secondary pollution is generated; the passivator has a good passivating effect on heavy metals in farmland soil, can increase the organic matter content and the cation exchange capacity of the soil, prevent and treat soil hardening, effectively improve soiltexture, adjust soil porosity, provide necessary nutrient substances for microbial survival, improve the physical and chemical properties and microbial flora of the soil and enhance the production potential of the soil.

The invention discloses a rock slope vegetation system and a vegetation planting construction method, and aims to solve the technical problem that vegetation is difficult to grow due to the fact that part of slope surfaces have inverted slopes and smooth surfaces and no conditions for rooting of the vegetation and storage of nutrients and water exist in anti-gravity growth of the vegetation. The rock slope vegetation system comprises an iron gauze, a reinforcing mesh, a vegetation concrete base material base layer, a vegetation concrete base material surface layer and a vegetation layer. The vegetation planting construction method sequentially comprises the steps of rock slope surface treatment, surveying and setting-out, reinforcement system construction, spraying system construction, vegetation concrete spraying construction and slope surface treatment and maintenance. The device is simple in structure, scientific and reasonable in design and convenient to use, and can effectively solve the technical problem that vegetation is difficult to grow due to the fact that a part of slope surfaces have inverted slopes and smooth surfaces and no conditions for rooting of the vegetation and storage of nutrients and water exist in anti-gravity growth of the vegetation.

The invention belongs to the field of building materials and discloses a method for preparing a foam ceramic heat-insulation board by utilizing gold ore tailings. The foam ceramic heat-insulation board is characterized by being prepared from the following components in parts by weight: 25 weight percent to 70 weight percent of the gold ore tailings, 0 to 15 weight percent of pottery stone, 5 weight percent to 20 weight percent of feldspar, 0 to 25 weight percent of clay, 0 to 15 weight percent of sandstone, 5 weight percent to 10 weight percent of coal gangue, 0.3 weight percent to 1.5 weight percent of additional SiC, 0.5 weight percent to 2.0 weight percent of additional Fe2O3 and 0.5 weight percent to 1.5 weight of an additional grinding aid. The method takes the gold ore tailings as a main raw material and takes the SiC, the coal gangue and the Fe2O3 as a compound foaming agent; the prepared foam ceramic heat-insulation board has a uniform and controllable pore diameter and low cost and a process is simple.

The invention discloses a metal organic framework modified stannous sulfide composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst takes a metal organic framework MIL-53(Fe) as a carrier and is loaded with stannous sulfide. The preparation method of the composite photocatalyst comprises the following steps: mixing MIL-53(Fe) with stannous sulfide, adding solution containing S<2->, and carrying out precipitation reaction, so that the metal organic framework modified stannous sulfide composite photocatalyst is obtained. The composite photocatalyst disclosed by the invention has the advantages of environment friendliness, large specific surface area, many reaction sites, high photogenerated electron-hole utilization rate, high photocatalytic activity, good stability and corrosion resistance, and the preparation method has the advantages of simplicity in operation, low raw material cost, low energy consumption, short consumed time and easy-to-control conditions. The composite photocatalyst disclosed by the invention can be used for degrading hexavalent chromium wastewater, has the advantages of high degradation efficiency, simple application method, low cost and no secondary pollution and has a good practical application prospect.

The invention provides a preparation method of a nano-hydroxyapatite-doped porous bionic bone scaffold. According to the preparation method, a hyaluronic acid-gelatin-nano-hydroxyapatite cross-linked composite porous scaffold with good mechanical strength is prepared from hyaluronic acid, gelatin and nano-hydroxyapatite by virtue of a freeze-drying method and a chemical cross-linking method. The porous composite scaffold prepared by virtue of the preparation method has uniform aperture and very good cell adhesion capacity and mechanical strength and further has osteoconductivity, hole walls are thin, and pore spaces are penetrated. The preparation method has the advantages that the composite scaffold can be used for relatively truly simulating a bone tissue microenvironment, and parameters of aperture, porosity, degradation rate, water absorption rate, mechanical strength and the like of the scaffold can be adjusted and controlled by adjusting the concentration, volume ratio and freeze drying conditions of each component; the adopted materials have good biocompatibility, and the prepared scaffold can meet an internal porous structure of bone tissues; and the sources of the material are sufficient, and the preparation process is simple.

The invention discloses a VO2 film with a three-dimensional ordered porous network structure, and a preparation method and application thereof. The method stacks polystyrene microspheres on a glass substrate through a vertical immersion method, so that a die plate preparing a VO2 film can be formed; the die plate is immersed into a VO2 precursor solution, so that the slit between the polystyrene microspheres can be fully filled with V2O5 in the precursor solution; the V2O5 is converted into VO2 through follow-up drying and annealing process; the polystyrene microspheres are heated to evaporate, and the VO2 can form a three-dimensional ordered porous network shape; and the film has a complete three-dimensional ordered porous network structure. As the whole structure has holes, the holes canseparate fractures generated between VO2 particles on some frame, so that fracture force can be separated, and phase transition stress can be diluted.

The invention discloses a calixarene porous polymer with ultra-high removal rate and ultra-high adsorption capacity and application of the calixarene porous polymer to selective separation of dyes. According to the invention, octafluoronaphthalene and decafluorobiphenyl are used as cross-linking agents, two calixarene-based porous polymers, namely POP-8F and POP-10F, are synthesized through simple and mild reaction without using a catalyst, show extraordinary adsorption capacity and adsorption rate on cationic dyes including rhodamine B (RhB), methylene blue (MB) and crystal violet (CV), and exceed those of all previously reported porous adsorbents. The calixarene-based porous polymers comprise COFs, MOFs, POPs, a biomass adsorbent, activated carbon and the like. More importantly, the calixarene-based POPs can effectively remove cationic dyes through simple column filtration, and shows excellent reusability. Because of the characteristics, the POP-8F and the POP-10F become porous adsorption materials which can be used for treating and purifying water pollutants.

The invention discloses an anhydrous calcium hydrophosphate/hydroxyapatite biphasic porous microsphere material, and a preparation method and an application thereof. The anhydrous calcium hydrophosphate/hydroxyapatite biphasic porous microsphere material is particle microspheres formed by coexistence of 10%-90% by mass of anhydrous calcium hydrophosphate and 90%-10% by mass of hydroxyapatite, theparticle diameter is 15-65 [mu]m, the surface is porous, the pore size range is 1-50 [mu]m, and the porosity is 33%-65.34%, and the anhydrous calcium hydrophosphate/hydroxyapatite biphasic porous microsphere material is prepared by a hydrothermal precipitation method; the anhydrous calcium hydrophosphate/hydroxyapatite biphasic porous microsphere material disclosed by the invention has relativelygood biocompatibility and biomineralization capability, relatively short degradation period, and high pore size and porosity, is an ideal biomedical material, and can be used for constructing bone tissue engineering scaffolds or used as a sustained-release carrier of antibiotics, antituberculous compounds, growth factors, antitumor agents and the like.

The invention discloses an organic porous framework material with adsorptive desulfurization performance and a preparation method thereof. According to the principles of the Knoevenagel reaction, an aldehyde compound and a cyano compound with active alpha-hydrogen atoms are subjected to a condensation reaction under a weakly alkaline condition, so a graphene-like organic porous framework material product in which reaction monomers are connected by carbon-carbon double bonds is finally obtained. The prepared material has a large-area conjugated structure unit, and due to the structural characteristic, the material has a more remarkable adsorption effect on aromatic thiophene sulfur compounds compared with alkane compounds.

The invention provides a degradable metal patch and a preparation method thereof. The metal patch has a through hole structure with the porosity of 20%-50%. The preparation method of the degradable metal patch comprises the following steps: preparing a wire material; pre-treating the wire material; cutting the wire into sections, dispersing and mixing; performing cold pressing and preforming; and performing hot-press molding. The metal patch has excellent mechanical properties and biocompatibility, can protect damaged tissues, can convey substances such as nutrient substances and metabolites at the same time, and is gradually degraded along with a tissue healing process.

The invention relates to the field of material modification technology and aerobic fertilizer making process, in particular to a preparation method of modified oyster shell powder and its application as a compost additive to promote composting. The modified oyster shell powder obtained by fixing fulvic acid to oyster shells by a solid-phase grafting method is used as an aerobic composting additive. The immobilized fulvic acid of the present invention not only overcomes the defect of leaching loss of fulvic acid, but also uses porous oyster shell powder to turn waste into wealth, improves the fermentation efficiency of aerobic composting and significantly reduces nitrogen loss. The invention has simple technological process, low cost and good application value.

The invention discloses a preparation method of a hyper-crosslinked polymer loaded molecular sieve and Fe catalyst and application of the hyper-crosslinked polymer loaded molecular sieve and Fe catalyst in production of divinylbenzene. The preparation method comprises the following step of: A1, constructing a reflux condensation device, sequentially adding 0.9302 g of diferrocene, 0.39 g of benzene and 0.4948 g of 1, 2-dichloroethane into a 50ml two-neck round-bottom flask, then adding an external crosslinking agent dimethoxymethane FDA, stirring for 30 minutes, then, rapidly adding 0.8110 g of anhydrous FeCl3 into the device to obtain a mixture K, and heating the mixture to complete condensation polymerization reaction to generate a microporous structure. According to the present invention, the super-crosslinked polymer is adopted as the carrier to load the ZSM-5 molecular sieve and the Fe, the prepared catalyst has high activity and high selectivity on the reaction of catalyzing the synthesis of divinylbenzene from ethylbenzene and diethyl carbonate, the preparation of divinylbenzene from ethylbenzene and diethyl carbonate is performed in a fixed bed reactor, and the whole catalytic reaction has the characteristics of low energy consumption, high selectivity, high activity and the like.

The present invention relates to the field of special filling pads for chairs, beds or sofas, particularly to a loose elastic pad and a manufacturing method thereof. The loose elastic pad comprises plastic fibers (1) and is characterized in that the plastic fibers (1) is at least divided into three groups with different extending directions, the intersection point positions of various groups of the plastic fibers (1) adopt hot melting adhesion, the end points of all plastic fibers (1) and the envelopes on the outer edges of the outermost side plastic fibers (1) present the rectangular parallelepiped, and the rectangular parallelepiped is the elastic pad (10). The manufacturing method is characterized in that the steps such as feeding, heating, extrusion, molding, drawing, and cutting are sequentially performed. The loose elastic pad of the present invention has characteristics of simple structure, easy manufacturing, moderate hardness, and wide application range.

The invention discloses an organic porous material for electronic special gas adsorption separation and a preparation method thereof, and a fluorine-containing organic porous framework material product connected by carbon-carbon bonds is obtained according to an aromatic hydrocarbon dehalogenation reaction principle. The material prepared by the invention has an organic nanopore structure and strong hydrophobic property, so that the material has an obvious adsorption effect on electronic special gas due to the structural characteristic.