6results about How to "Diffusion distance is short" patented technology

The application relates to the field of fine chemical synthesis, and relates to a preparation method of polyvinylpyrrolidone. Pure water, N-vinylpyrrolidone and ammonia water are continuously introduced into a micro-mixer, uniformly mixed in the micro-mixer, and then introduced into a preheater to be preheated to a reaction temperature; the obtained mixture is sequentially and continuously introduced into a micro-channel reactor and a delay reactor together with an aqueous hydrogen peroxide solution, and the reaction is carried out at normal pressure at 55-80 DEG C; and the product continuously coming out of the delay reactor is a polyvinylpyrrolidone solution. The application is a continuous preparation method which is easy to control in temperature, high in safety, narrow in molecular weight distribution, short in reaction time and easy to industrialize.

The application relates to a one-step method for preparing metal sulfide ultrathin nanosheets and application, which comprises the following steps: step one: uniformly mixing a metal salt, a salt template agent and thiourea in ethanol to obtain a precursor mixed liquid; step two: performing heating and drying on the precursor mixed liquid to obtain a precursor powder; step three: performing heat treatment on the dried precursor powder; and step four: soaking the heat-treated precursor powder in deionized water, and then performing cleaning and drying to obtain a metal powder, namely the metal sulfide ultrathin nanosheet. The method for preparing the metal sulfide ultrathin nanosheet provided by the application does not need to additionally introduce a sulfur source, is simple and easy to operate, has low cost, and the obtained metal sulfide two-dimensional ultrathin nanosheet has uniform morphology, can provide a larger specific surface area, abundant energy storage sites and a shorter diffusion distance, and has great application prospects in the field of alkali metal ion batteries-potassium ion batteries.

The application discloses a kind of GH3536 alloy targeted titanium microalloying and preparation method thereof, and the application is prepared into titanium-containing pre-polymer colloid by acetylacetone titanium, polyvinyl alcohol, polyvinylpyrrolidone, polyethylene imine, citric acid and ethylene glycol, coated on the surface of GH3536 alloy powder and pyrolyzed by program temperature, pre-constructed carbon-nitrogen co-doped porous carbon limited titanium dioxide coating on the surface of powder, then layer-by-layer forming is carried out by using coaxial powder feeding type laser melting deposition process, in situ release titanium atom by carbon thermal reduction reaction in laser molten pool and make it to segregate at the grain boundary of solidification front, while interlayer is supplemented with ultrasonic vibration treatment.The application realizes the targeted microalloying of titanium element in the process of laser melting deposition of GH3536 alloy, improves the distribution form of grain boundary carbide;The elongation after fracture of deposited sample of the application is improved by 39.4%~50.7% compared with untreated sample, and the strength-plastic product is improved by 63.0%, and the grain boundary liquidized crack is inhibited.

The application discloses high-sulfur petroleum coke derived porous carbon, a preparation method thereof, an electrode material and a sodium ion battery. The porous carbon provided by the application is N / S doped porous carbon, and the sulfur content of the porous carbon is 1.5-5.5 wt%. The porous carbon provided by the application has the structural advantages of N / S atomic double doping, and the prepared composite material has rich active sites, a short diffusion distance and high electrical conductivity, and can be applied to sodium ion batteries as an electrode material.

The present application relates to a kind of experimental methods based on microfluidic test gas-liquid diffusion distance and diffusion coefficient.The experimental device is composed of microfluidic chip, microfluidic chip holder, 4 opening high temperature and high pressure micro reaction kettle, trace displacement pump, back pressure constant pressure pump, back pressure valve, intermediate container, temperature control box, image acquisition device and the like.The method comprises the following steps: (1) establishing corresponding simulation porous medium model; (2) configuring sample; (3) connecting experimental device and leak detection; (4) pre-saturation crude oil; (5) adjusting temperature to formation temperature; (6) establishing system pressure to formation pressure; (7) simulating micro diffusion experiment, and recording diffusion condition in real time; (8) after experiment, unloading pressure; (9) using image processing software to determine diffusion distance by observing color change of crude oil; (10) using diffusion distance to calculate diffusion coefficient.The present application is convenient and fast, and the result is accurate and reliable, which provides theoretical guidance and technical support for improving recovery efficiency.

This invention provides a method for preparing perovskite titanate materials with preferred growth on the (311) crystal plane and its application. The structural formula of the perovskite titanate material is A. x B y TiO4, wherein element A is at least one of Na, Ca, and La, and element B is at least one of Y, Ni, and Sr, and 0 < x ≤ 1, 0 < y ≤ 1. The perovskite titanate material prepared by this invention has a low crystal defect content, and the (311) crystal plane is the dominant crystal plane. The (311) direction is the direction of rapid diffusion of lithium ions in the bulk structure of the perovskite titanate material. The perovskite titanate material dominated by the (311) crystal plane has a short ion diffusion distance and a fast overall lithium ion diffusion rate, thereby improving the rate performance of the material.