42results about How to "Good self-supporting performance" patented technology

The invention discloses a carbon nano-tube network/polymer composite material. The carbon nano-tubes are mutually tangled to form a network structure, wherein the outer surface of the carbon nano-tube is uniformly wrapped with a polymer, and the carbon nano-tube and the polymer are all independently existed in a non-aggregated state. Compared with the prior art, the carbon nano-tube is existed in a non-aggregated state and the polymer is existed in a non-enriched state; by adopting the carbon nano-tube network/polymer composite material, the shortcomings of the traditional carbon nano-tube composite material such as the agglomeration of the carbon nano-tubes and the low content are solved, meanwhile, the excellent mechanical property, electrical property and thermal property of the carbon nano-tube are kept, and the carbon nano-tube is excellent in self-supporting property and is easy to process in the using process and has a wide application future in the fields such as the electromagnetic shielding materials, functional intelligent materials and electrode materials.

A master cylinder of the present invention is disposed with valve bodies (26a) and (28a). Support portions (26b) and (28b) on one end side of these valve bodies (26a) and (28a) are respectively supported in connecting opening portions (22) and (23) of a reservoir (21) so as to be rotatable using these support portions (26b) and (28b) as fulcrums. During the start of operation, when brake fluid flows out from hydraulic chambers (10) and (11) to the reservoir (21), the valve bodies (26a) and (28a) rotate and close such that the flow of the brake fluid is restricted by notches (22a) and (23a), and the dead strokes of pistons (5) and (6) become small. During intake of the brake fluid by pumps; when the brake fluid flows from the reservoir (21) to the hydraulic chambers (10) and (11), the valve bodies (26a) and (28a) rotate and open such that the brake fluid flows to the hydraulic chambers (10) and (11) without its flow being restricted, and fluid self-support performance is ensured.

The invention relates to a lithium-sulfur battery flexible electrode material and preparation method and application thereof. The lithium-sulfur battery flexible electrode material comprises a VOx nanometer hollow sphere wound with a single-walled carbon nanotube, wherein elemental sulfur is coated in the VOx nanometer hollow sphere, and x is equal to 1.5 to 2.5. By means of an absorption effect of VOx on lithium polysulfide and a wrapping effect of a hollow sphere structure on the polysulfide, the VOx nanometer hollow sphere is combined with the single-walled carbon nanotube, the binding capability of the lithium-sulfur battery flexible electrode material on the elemental sulfur and the polysulfide is synergically improved, and the lithium-sulfur battery flexible electrode material has excellent cycle stability and high battery capacity during the charge-discharge process. The initial discharging capacity of a VOx flexible film with a diameter about 200 nanometer under 1C rate currentcan reach 1,069mAh/g or above and still can reach 614mAh/g or above under 20C rate current; the lithium-sulfur battery flexible electrode material is excellent in cycle efficiency, and the capacity still can be maintained at 69% or above after charging and discharging for 300 circles; and after the lithium-sulfur battery flexible electrode material is used as a lithium-sulfur battery positive electrode assembled to form a flexible soft package battery, the voltage stability is high under different bending angles, the cycle property is excellent under different bending angles, and the capacityreduction rate is average less than 0.32% after 20-100 circles.

The invention discloses a degradable magnesium mesh for 3D printing personalized alveolar bone defect reconstruction. According to the magnesium mesh, a personalized model structure is designed according to CT data, high-precision preparation of the magnesium mesh is achieved through the 3D printing technology, and the magnesium mesh is made to be tightly attached to the anatomical appearance of the alveolar bone; the defects that a traditional titanium mesh needs to be bent in an operation and the postoperative exposure rate is high are overcome, the operation difficulty and time are reduced, and the operation success rate is increased. The surface of the magnesium mesh is of a completely-perforated regular hexagon structure, and the mesh structure has the advantages of self-supporting, easiness in forming, high printing precision, good mechanical property and the like. Meanwhile, by combining the degradability of a magnesium material and the advantage of promoting osteogenesis through bone induction of magnesium ions, the problems that a titanium mesh shields stress and cannot be degraded, and secondary operation is needed for taking out the titanium mesh during tooth implantation are solved. The preparation process is simple, the preparation period is short, raw material loss is small, repeatability is high, pollution is avoided, and the prepared magnesium mesh has the advantages of being controllable in appearance and high in precision and can serve as a new generation of oral cavity alveolar bone large-area bone defect repairing support.

The invention provides application of 3D printing in cross-linked polyimide, preparation of porous polyimide and preparation of a polyimide composite material, and belongs to the technical field of 3D printing and intelligent manufacturing. The direct writing 3D printing technology is applied to the cross-linked polyimide, and the cross-linked porous polyimide which is good in heat resistance, excellent in size stability, rich in pores and controllable in pore diameter can be simply prepared. the technology is used for preparing the polyimide composite material, the prepared polyimide composite material has the characteristics of excellent thermal performance, good dimensional stability and complex shape, the process is simple, and the polyimide composite material with diversified shapes can be prepared.

The invention relates to a preparation method of a high-performance all-solid-state lithium ion battery. The invention aims to solve the problem of low conductivity of a diaphragm of the all-solid-state lithium ion battery prepared by the existing method. The method comprises the following steps of 1, preparing a polymer electrolyte precursor solution; 2, preparing a polymer electrolyte precursor solution monomer; 3, preparing the polymer electrolyte precursor solution monomer polymerization; 4, preparing the polymer electrolyte of the all-solid-state lithium ion battery; and 5, assembling the battery. The ionic conductivity sigma of the diaphragm of the all-solid-state lithium ion battery prepared by the method reaches 1.1*10 <-3> S.cm <-1>, the safety performance of the lithium ion battery is greatly improved, and the all-solid-state lithium ion battery has the advantages of high charge/discharge specific capacity, stable cycle performance, safe operation, simplicity and convenience and the like, and is suitable for large-scale preparation and commercial application. The method is applied to the field of all-solid-state lithium ion batteries.

The invention discloses a boron-doped carbon nano-tube film, a preparation method and applications thereof. The preparation method comprises the following steps: 1) weighing ethanol, ferrocene and thiophene according to a mass ratio of (90-100):(1.3-1.7):(0.5-1.5) to obtain a mixed solution, adding boric acid accounting for 1-3 wt% of the mixed solution into the mixed solution, and uniformly dispersing at 40-60 DEG C to obtain a precursor solution; 2) completely sealing a CVD furnace, continuously introducing 100-200 sccm of Ar to remove air in the furnace, adjusting the temperature of the CVDfurnace to 1100-1200 DEG C, and keeping the temperature for 2-5 h to provide a constant-temperature environment for subsequent growth of a carbon nano-tube film; 3) closing Ar, continuously introducing 700-900 sccm of H2 as a reaction gas until the whole hearth is filled with H2, injecting the precursor solution obtained in the step 1 into the furnace in a uniformly-dispersed mist liquid dropletmode at a liquid injection rate of 8-15 mL/h through an ultrasonic atomization device, and after 10-30 min, obtaining a boron-doped carbon nano-tube film at the bottom of the hearth, wherein the massspecific capacitance can reach up to 65.6 F/g.

The invention relates to an ecological geometry self-expanding structure simulation moving bed. A central column located on the axis of a tower body and a plurality of grid layers distributed up and down are arranged in the tower body. A space for forming an adsorption bed layer is reserved between two adjacent grid layers; the appearance of the central column is in a regular hexagonal prism shape; the grid layer is horizontally arranged; six radial grid bars which are distributed at equal angular intervals are arranged on the same grid layer; tangential grid bars are distributed between the adjacent radial grid bars; the two ends of each radial grid bar are supported on the central column and a supporting ring of the tower body respectively, the two ends of each tangential grid bar are connected with frames of the corresponding radial grid bars respectively, the tangential grid bars and the radial grid bars are spliced together to form a complete grid layer, and the radial grid bars and the tangential grid bars are all formed parts. By optimizing the distribution structure of process materials, the distribution uniformity is improved, and machining and assembling are facilitated.

The invention discloses a boron-nitrogen co-doped carbon nanotube film and a preparation method and application thereof. The preparation method comprises the following steps of: 1) weighing ethanol, ferrocene and thiophene according to a mass ratio of (90-100): (1.3-1.7): (0.5-1.5) to obtain a mixed solution, adding 1-3wt% of boric acid and 2-4wt% of pyridine into the mixed solution, and uniformlydispersing at 40-60 DEG C to obtain a precursor solution, 2) completely sealing a CVD furnace, continuously introducing inert gas to remove air in the furnace, adjusting the temperature of the CVD furnace to 1100-1200 DEG C, and keeping the temperature for 2-5 hours to provide a constant-temperature environment for subsequent growth of the carbon nanotube film, 3) closing the inert gas, continuously introducing H2 as a reaction gas until the whole hearth is filled with H2, injecting the precursor solution obtained in the step 1 into the furnace at a liquid injection rate of 3-8 mL/h by virtueof an ultrasonic atomization device in a uniformly dispersed vaporific droplet manner, and collecting the boron-nitrogen co-doped carbon nanotube film at the bottom of the hearth after 10-30min. Andthe mass specific capacitance of the film is 130-150 F.g<-1>.