4results about How to "Improve introduction efficiency" patented technology

The invention discloses a near-neutral synthesis method of high-aluminum-content mesoporous aluminosilicate, which comprises the following steps: firstly, dissolving a template agent in deionized water, and fully stirring to obtain a uniform template agent solution; the preparation method comprises the following steps: uniformly mixing a silicon source with an inorganic salt, and uniformly mixing an aluminum source with a dilute sulfuric acid solution in deionized water to prepare a silicate solution and an aluminum salt solution; synchronously dripping the silicate solution and the aluminum salt solution into the template agent solution to form an aluminosilicate precursor; and performing crystallization, suction filtration, washing, drying and roasting treatment on the precursor to finally obtain the mesoporous aluminosilicate material. In the process of synthesizing the mesoporous aluminosilicate by using the inorganic salt under the near-neutral condition, anions and aluminum ions form a soluble complex (such as Al (HCO3) 2 +), hydrolytic precipitation of aluminum species in a neutral environment is effectively inhibited, and it is ensured that the aluminum element participates in the reaction in an active form; the efficient synthesis of the mesoporous aluminosilicate material with high aluminum content and high order degree is realized.

The present invention discloses a graphite boat electrode introduction device for PECVD equipment and an electrode introduction control method, comprising: a driving element, a support base, a fixed seat, a sliding assembly and an electrode rod, one side of the support base is connected to the furnace tail flange of the PECVD equipment, the other side of the support base is provided with a driving element, the output end of the driving element is connected to the fixed seat, the support base is provided with a sliding assembly, the lower part of the fixed seat is connected to the sliding assembly, the upper part of the fixed seat is connected to the electrode rod, the electrode rod passes through the furnace tail flange and extends into the reaction chamber; under the drive of the driving element, the fixed seat and the sliding assembly drive the electrode rod to move back and forth in a straight line to realize the electrode rod being inserted into or out of the electrode hole of the graphite boat. The present invention has the advantages of compact structure, small size and convenient assembly and disassembly, and in the process of electrode introduction, the electrode rod only moves in a straight line without a downward pressing action, is not easy to deform, and also avoids the loss of the graphite boat caused by the impact of the electrode rod and the graphite boat.

The application relates to a quantum dot preparation method and belongs to the technical field of quantum dot materials. The quantum dot preparation method comprises the following steps: dispersing original core quantum dots in a nonpolar solvent I to obtain original core quantum dot suspension I; mixing the original core quantum dot suspension I with a polar solvent containing doped cations to transfer the original core quantum dots to the polar solvent to obtain original core quantum dot suspension II; adding nonpolar solvent II and ligand solvent into the original core quantum dot suspension II to transfer the original core quantum dots to the nonpolar solvent II to obtain ligand-exchanged original core quantum dot suspension III; and mixing dispersing solvent, doped cation precursor solution and the original core quantum dot suspension III to perform cation exchange. The application cooperates the pretreatment process of ligand exchange with the liquid-phase cation exchange process, and tunes the optical performance of the core quantum dots.

The optimized anti-overflow cooking utensil comprises a pot body with a cooking cavity and a pot cover used for opening or covering the cooking cavity, the pot cover is provided with a steam valve assembly, the steam valve assembly comprises a valve deck, a valve seat and a steam exhaust pipe, the valve deck is provided with a steam exhaust port communicated with the outside, and the valve deck and the valve seat are matched to define a mixing cavity; the valve seat is provided with a backflow area capable of being communicated with the mixing cavity and the cooking cavity, the steam exhaust pipe comprises a steam inlet section and a steam outlet section bent relative to the steam inlet section, the steam outlet end of the steam outlet section is located above the backflow area, the backflow area is provided with a plurality of backflow holes, and the section of at least part of the backflow holes is non-circular. Due to the design of the backflow hole, the curvature of the liquid level at the backflow hole is reduced, the additional pressure generated by the curvature is also reduced, and the reduction of the effective circulation area of the backflow hole is reduced, so that the backflow flow and the backflow speed at the backflow area are ensured, and slurry and condensate water after bubble breaking can smoothly flow back through the backflow area.