5results about How to "Increase activation energy" patented technology

The invention discloses an X8R type high-reliability ceramic dielectric material with a double-shell design and a preparation method and application thereof, and belongs to the technical field of electronic ceramic materials. According to the ceramic dielectric material, barium titanate is used as a main body material, at least one of Y2O3 and Dy2O3 is used as a first dopant, and at least one of MgO and MnO2 is used as a second dopant. The preparation method comprises the following steps: pre-sintering BaTiO3 and a first doping agent at a high temperature; and then adding a second doping agent for secondary mixing and high-temperature sintering. According to the method, a double-shell structure of a tetragonal phase crystal nucleus, a rare earth-rich inner shell layer and an Mg / Mn-rich outer shell layer is constructed in ceramic crystal grains. The high dielectric property of the BaTiO3 crystal nucleus is reserved, the rare earth-rich inner shell layer is used for inhibiting oxygen vacancy long-range migration, the Mg / Mn-rich outer shell layer is used for optimizing temperature stability, synergistic improvement of the high dielectric constant (epsilon r gt, 2200), X8R wide-temperature stability (delta C / C 25 DEG C is smaller than or equal to + / -15%, minus 55-150 DEG C) and high breakdown field strength (larger than or equal to 6.7 kV / mm) is achieved, and the high-dielectric-temperature-stability high-voltage-resistant MLCC is suitable for manufacturing the high-dielectric-temperature-stability high-voltage-resistant MLCC.

The application relates to the field of heat-sensitive ceramic materials, in particular to a high-stability rare earth-containing six-component low-resistance high-B-value NTC heat-sensitive ceramic material and a preparation method thereof. The raw material scheme of the NTC heat-sensitive ceramic material comprises trimanganese tetraoxide, nickel protoxide, reinforcing material, lanthanum trioxide, combined functional material and trimolybdenum tetraoxide. The final heat-sensitive ceramic material prepared by the application successfully breaks the technical bottleneck that the resistivity and the B value are restricted to each other in traditional NTC heat-sensitive ceramic materials, realizes good unification of low resistance and high sensitivity, significantly improves the accuracy and response speed of temperature detection; meanwhile, the long-term stability of the material under harsh service conditions such as high-temperature storage, humid heat environment and cold and hot impact is greatly improved, the resistance value drift is effectively inhibited, and the strict requirements of high-reliability scenes such as automobile electronics, industrial control and new energy battery management systems on long-term precise monitoring of temperature sensors can be met.

The invention discloses a preparation method of corn vinegar through lactic acid bacteria synergistic fermentation in combination with ultrasonic-microwave accelerated aging treatment, the method adopts an ultrasonic-microwave accelerated aging treatment technology to prepare novel corn vinegar, corn is taken as a raw material, liquefaction and saccharification stages are optimized through a two-enzyme method, and efficient conversion from corn starch to fermentable sugar is realized; lactobacillus plantarum is used for synergistically performing alcoholic fermentation to generate a plurality of flavor substances such as lactic acid and ethyl lactate; and the aging process of the corn vinegar is accelerated by combining ultrasonic-microwave aging accelerating treatment. Wherein ultrasonic waves can initiate a local high-temperature and high-pressure effect and a medium cavitation effect, so that polar molecules are orderly arranged, the molecular activation energy is improved, reactions such as esterification, condensation and oxidation reduction are accelerated, the energy consumption is relatively low, and the green production requirement is met; the microwave treatment breaks the association state of molecular groups in the original system through a microwave generator, and further accelerates the alkyd esterification process. The method solves the problems of unstable components and inharmonious smell in newly brewed corn vinegar.

The application provides a benzamide bromide-modified perovskite solar cell and a preparation method thereof, and belongs to the technical field of perovskite solar cells; the application solves the problem of low photoelectric conversion rate and poor stability of existing perovskite solar cells caused by uncoordinated lead ions; the application comprises the following steps: S1, placing a substrate covered with a transparent metal electrode into deionized water, acetone and ethanol for ultrasonic cleaning in sequence, and then drying and treating by ultraviolet ozone to form a conductive substrate; S2, spin coating an electron transport layer on the conductive substrate; S3, spin coating and depositing a perovskite active layer on the surface of the electron transport layer, wherein the perovskite active layer uses benzamide bromide as a passivation agent; S4, spin coating a hole transport material on the surface of the perovskite active layer to obtain a hole transport layer; and S5, evaporating a metal electrode on the hole transport layer; the application is applied to perovskite solar cells.

The present invention relates to the technical field of high-temperature energy storage dielectric films, and discloses a preparation method of a porphyrin cross-linker modified polyimide high-temperature energy storage dielectric film. Polyamic acid (PAA) precursor is obtained by condensing 4,4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA), and introducing ultra-low content of 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP) as a cross-linker. Cross-linked polyimide film (PCPI) is prepared by solution coating and gradient thermal imidization. The terminal amino groups of TAPP molecules form a covalent cross-linking network with PAA, and the porphyrin macrocycle π-conjugated system provides deep-level charge traps, significantly inhibiting high-temperature carrier migration. The breakdown strength of the optimal sample PCPI-0.1 reaches 475 MV / m at 200 °C, and the discharge energy density is 4.97 J / cm 3 , the charge-discharge efficiency is ≥85%. At the same time, it has a high glass transition temperature, high thermal stability, excellent cycle stability and film-forming uniformity. The solution coating process is simple to prepare, and the process conditions are simple and controllable, which is suitable for the batch production of high-temperature and high-energy storage polyimide dielectric films.