6results about How to "Uniform environment" patented technology

The invention relates to the technical field of crossing of material chemistry and water electrolysis oxygen evolution, in particular to a method for preparing a yolk shell structure high-entropy phosphide FeCoNiCrMn-P catalyst through a low-temperature phosphating method. The method comprises the following steps: dissolving a plurality of nitrates in isopropanol and a glycerin solvent to react to obtain high-entropy glycerate; carrying out hydrothermal reaction on the reacted high-entropy glycerate to generate a high-entropy hydroxide; the high-entropy hydroxide and a phosphorus source are subjected to a low-temperature phosphating reaction to generate the high-entropy phosphide catalyst. According to the invention, the reactant FeCoNiCrMn-P with a graded egg yolk shell structure not only exposes more active sites and provides abundant mass transfer channels, but also provides a uniform environment for heterogeneous catalysis, so that OER is promoted. In addition, the shell layer can also play a role of a protective layer, prevents the active components from deforming and dissolving in the catalytic process, and enhances the stability of the active components. When the current density is 10 mA cm <-2 >, the FeCoNiCrMn-P2 has the best OER performance, and the overpotential of the FeCoNiCrMn-P2 is 329 mV, so that the FeCoNiCrMn-P2 has high practical application value.

The invention discloses a glass sample culture dish which comprises a dish body and a cover body capable of adaptively covering an opening of the dish body, a clamping assembly for clamping and fixing a glass sample in the dish body is mounted in the dish body, and the glass sample clamped and fixed in the dish body is suspended and horizontally arranged in the culture dish body; the clamping assembly comprises three clamping units, each clamping unit comprises a guide rail and a clamp, a clamping groove is formed in each clamp, the clamps are installed on the guide rails through the clamping grooves matched with the guide rails, the three guide rails are arranged in the dish body in an annular array mode, groove bodies arranged in the length directions of the guide rails are formed in the guide rails, and screw rods are installed in the groove bodies. The bottom of the clamping groove is provided with an external thread matched with the screw, and the first end of the screw penetrates through the dish body and protrudes out of the dish body. The device can stably clamp a glass sample and keep the glass sample in a horizontal suspension state, so that the environment where each part of the sample is located is relatively uniform, and the accuracy of an experimental result is improved.

The invention relates to the technical field of sodium ion battery material preparation, in particular to a high-performance hard carbon negative electrode material and a preparation method and application thereof.The preparation method comprises the following steps that S1, porous carbon and liquid asphalt are mixed, a binder, a conductive agent and a dispersing agent are added, and an active substance is obtained; and S2, performing ball milling on the active substance, coating the surface of a copper foil with the active substance, drying, covering the surface of the active substance with a layer of copper foil to form a copper foil-active substance-copper foil structure, and performing high-temperature calcination to obtain the high-performance hard carbon negative electrode material. The hard carbon negative electrode material prepared by the method shows relatively high reversible capacity and first coulombic efficiency in the sodium-ion battery, has good cycling stability, and is beneficial to large-scale production of the sodium-ion battery negative electrode material.

The utility model discloses a multifunctional cowshed environment regulation and control device, including the cowshed body of setting, the cowshed body top inside installation has the slide rail, the slide rail inside slide connection has the sliding block, the water storage tank is connected through the installation component under the sliding block, the water storage tank lower portion is provided with the regulator and the control box, the control box inside installation has the motor, the regulator and motor are electric connection, the motor output end is connected with the rotating shaft, the rotating shaft outside installation has the fan. This multifunctional cowshed environment regulation and control device, the whole device is slid with the slide rail and the sliding block, can move along the cowshed body top, the whole moving structure breaks the limitation of fixed installation, greatly expands the coverage of environmental regulation, reduces the problem that the cowshed use space is affected by setting multiple detection structures, the fan operation realizes the air circulation in the cowshed, and the whole structure is simple, reduces the problem that the maintenance cost increases by setting complex system.

The present invention belongs to the technical field of industrial crystallization, and discloses a process for preparing D-tagatose crystals, which specifically includes the following steps: (1) under the assistance of ultrasound, after adding a seed solution to a saturated D-tagatose solution, the crystals are grown at 50-60°C; wherein, in the process of growing the crystals, materials are added while evaporating and concentrating; (2) after adding hydroxypropyl methylcellulose to the D-tagatose solution obtained in step (1), cooling and crystallizing are performed under infrared spectroscopy; (3) after filtering the D-tagatose solution obtained in step (2), a first filter residue and a filtrate are obtained, ethanol is added to the filtrate to continue crystallization, and then centrifuged to obtain a second filter residue, wherein the first filter residue and the second filter residue are D-tagatose crystals. The method of the present invention shortens the crystallization cycle, has a high yield, and the obtained product has high purity, good fluidity, stable quality, and is suitable for food industry production.