7results about How to "Controllable distribution" patented technology

A preparation method of a controllable CNTs@PyC interface layer in carbon / carbon composite material, ZIF-67 with different distribution patterns is carried on the surface of carbon fiber; CNTs are in-situ generated from ZIF-67 through chemical vapor deposition, CNTs are distributed on the surface of carbon fiber in different growth patterns; PyC is deposited on the surface of carbon fiber, different shapes of CNTs@PyC interface layer shape are obtained, by controlling the different growth patterns of ZIF-67 on the surface of carbon fiber, the different distribution states of CNTs derived exist, so as to realize the controllable and adjustable interface layer shape, to meet the application requirements under different conditions: the circular ring shape reduces the stress concentration of CNTs@PyC interface layer, avoids a large number of cracks in the composite material. The wave shape is beneficial to the application of carbon / carbon composite material in the service environment under the tensile condition, prolongs the crack propagation path along the interface layer, effectively relieves the PyC ring cracking phenomenon around the fiber, and is more easy to realize the interlocking effect between the interface layer and the carbon matrix, effectively prevents the interface debonding phenomenon, and greatly improves the mechanical properties of carbon / carbon composite material.

The application relates to a surface enhanced Raman scattering (SERS) substrate, a preparation method and application thereof, and belongs to the technical field of Raman spectrum detection. The substrate comprises, from bottom to top, a substrate layer, a distributed Bragg reflector, a chalcogen phase change material functional layer and a nanoscale metal structure layer. The distributed Bragg reflector is composed of a periodic structure stack of medium materials with different refractive indexes. The distributed Bragg reflector is coupled with the nanoscale metal structure layer to excite a Tamm state. The chalcogen phase change material functional layer can realize reversible regulation of amorphous state and crystalline state under external light excitation, changes the Tamm state resonance wavelength to regulate the SERS enhancement effect. The application realizes high-sensitivity detection through double enhancement of the Tamm state and localized surface plasmon resonance, has the characteristics of non-volatility, reconfigurability, high reproducibility and design flexibility, is convenient to operate, stable in performance, and is suitable for fields of chemical biological sensing, laboratory chip systems and optical encryption.

The invention discloses a solid-phase composite manufacturing device based on micro-macro wire feeding and a composite material manufacturing method.The solid-phase composite manufacturing device based on micro-macro wire feeding comprises a macro additive manufacturing module and a micro additive manufacturing module, and the macro additive manufacturing module comprises a first wire feeding mechanism and a first stirring head; a first spiral groove is formed in the periphery of one end of the first stirring head, the first wire feeding mechanism is used for conveying a base material towards the first spiral groove, the microscopic additive manufacturing module comprises a second wire feeding mechanism and a second stirring head, and the second stirring head is arranged in the first stirring head and can rotate relative to the first stirring head; a second spiral groove is formed in the periphery of the end, close to the first spiral groove, of the second stirring head. The second wire feeding mechanism is used for conveying reinforcing materials towards the second spiral groove. According to the solid-phase composite manufacturing device based on micro-macro wire feeding, the composite material with the reinforcing material distribution controllable can be manufactured, and the base material and the reinforcing material can be conveyed without shutdown.

The invention discloses a process and a method for preparing a nano material. Specifically, lithium iron phosphate, composite sodium iron phosphate and calcium carbonate are efficiently prepared by adopting a sol-gel method and a precipitation method respectively. When the lithium iron phosphate and the composite sodium iron phosphate are prepared, the reaction process is controllable by regulating and controlling the oscillation condition, the reaction temperature, the pH value and the retention time, and a target product is obtained after the gel is calcined. When calcium carbonate is prepared, nucleation and crystallization are enhanced by controlling the flow rates of a precursor, a precipitator and a surfactant and combining oscillation. According to the method, mixed mass transfer is enhanced by means of periodic oscillatory flow, local supersaturation and concentration gradient are inhibited, reactant deposition and channel blockage are reduced, continuous and stable production is guaranteed, meanwhile, the use amount and cost of a surfactant are reduced, and accurate regulation and control over the particle size, morphology and distribution of the material are achieved. Compared with a traditional process, the preparation period is greatly shortened, the product purity and the reaction efficiency are improved, and the method is suitable for industrial continuous production and has remarkable economic benefits and social benefits.

The application provides a multi-stimulus response shape memory polyurethane composite material and application thereof. The composite material comprises a shape memory polyurethane material and a nano-functional filler, and the nano-functional filler is uniformly embedded in the shape memory polyurethane material. The provided composite material can realize multi-stimulus response and has excellent performance.

The present application provides a dehydrogenation catalyst, a preparation method and application thereof, and a method for preparing ethylene by oxidatively dehydrogenating ethane and carbon dioxide, the catalyst comprising a carrier and a dehydrogenation active component supported on the carrier, the dehydrogenation active component comprising a first active component and a second active component, the first active component being iron, and the second active component being selected from one or more of cobalt, nickel, copper, zinc and palladium, and the dehydrogenation active component being concentratedly distributed on the surface of the carrier; and / or the reduction peak temperature of the dehydrogenation active component in a hydrogen temperature programmed reduction test is greater than the reduction peak temperature of a sample with a corresponding active component dispersion of 50%. The present application can change the distribution of the multi-metal active component on the surface of the carrier by controlling the synthesis conditions, and further adjust the selectivity of the catalyst to the oxidative dehydrogenation reaction of low-carbon alkanes.

The invention discloses a core-shell structure mineralizer modification-based photocuring 3D printing aluminum-based ceramic core and a preparation method thereof. The aluminum-based ceramic core comprises the following substances in percentage by weight: 65-75% of aluminum-based ceramic powder, 5-15% of a core-shell structure mineralizer component and 15-25% of a photosensitive resin component. The preparation method comprises the following steps: preparing aluminum-based ceramic core slurry, and vacuumizing the aluminum-based ceramic core slurry; injecting the aluminum-based ceramic core slurry into a trough of 3D printing equipment, and printing an aluminum-based ceramic core blank; the aluminum-based ceramic core green body is subjected to ultrasonic cleaning and drying treatment; and the aluminum-based ceramic core blank is subjected to degreasing treatment and sintering treatment, and the photocuring 3D printing aluminum-based ceramic core based on core-shell structure mineralizer modification is prepared. According to the method, the sintering temperature of the 3D printing aluminum-based ceramic core blank can be effectively adjusted, generation of interlayer cracks in the degreasing and sintering process is reduced, and the aluminum-based ceramic core with excellent comprehensive performance is obtained.