7results about How to "Increase polarizability" patented technology

The invention relates to the technical field of organic photoelectric materials, in particular to an acceptor material containing a cyclohexyl side chain, the structural formula of the acceptor material containing the cyclohexyl side chain is one of Y-C1 or Y-C2, and the acceptor material containing the cyclohexyl side chain is # imgabs0. On the basis of a traditional A-D-A structure with a Y series analogue as a core, a large-volume steric hindrance side chain is introduced, and a large-volume cyclohexyl group is introduced into the side chain, so that the acceptor material containing the cyclohexyl side chain is obtained. The organic small molecule acceptor material has the advantages that the steric effect is increased, the intramolecular and intermolecular interaction is adjusted, the polarizability of molecules is enhanced, the intermolecular electron orbital overlapping is promoted, the delocalization of charge transfer pathways is promoted, the energy loss is further reduced, and the efficiency is improved; the material has excellent charge transfer characteristic and good intermolecular accumulation effect, is beneficial to the improvement of charge mobility, and has better photovoltaic performance in the test of a ternary organic solar cell.

The present invention relates to the field of piezoelectric ceramic materials, in particular to a piezoelectric ceramic material with high Curie temperature and high piezoelectric coefficient and a preparation method thereof, wherein the structural formula is as follows: (1‑x‑y)(Bi2O2) 2+ (A m‑1 B m O 3m+1 ) 2‑ ‑xLiTaO3‑yLaAlO3, where A is Na + , K + , Ca 2+ , Sr 2+ , Ba 2+ , Pb 2+ 、Bi 3+ ,La 3+ Any one or more of the following; B is Fe 3+ 、Ti 4+ , Nb 5+ , W 6+ Any one or more of the composites; m is an integer between 1‑4; 0<x≤0.2; 0<y≤0.2. The piezoelectric ceramic material prepared by the present invention has a high Curie temperature and excellent electrochemical properties. The maximum piezoelectric constant can reach 35pC / N, which is significantly improved compared with the currently reported bismuth layered structure piezoelectric ceramics.

The invention relates to the field of piezoelectric ceramic materials, in particular to a piezoelectric ceramic material with high Curie temperature and high piezoelectric coefficient and a preparation method thereof, the structural formula of the piezoelectric ceramic material is as follows: (1-x-y) (Bi2O2) < 2 + > (Am-1BmO3m + 1) < 2-x > LiTaO3-yLaAlO3, A is any one or more of Na < + >, K < + >, Ca < 2 + >, Sr < 2 + >, Ba < 2 + >, Pb < 2 + >, Bi < 3 + > and La < 3 + >; b is any one or more of Fe < 3 + >, Ti < 4 + >, Nb < 5 + > and W < 6 + >; m is an integer between 1 and 4; 0 < x < = 0.2; 0 < y < = 0.2, the piezoelectric ceramic material prepared by the method has high Curie temperature and excellent electrochemical performance, the maximum piezoelectric constant can reach 35pC / N, and compared with the currently reported bismuth layered structure piezoelectric ceramic, the piezoelectric ceramic material has the advantage that the piezoelectric constant is greatly improved.

The present invention discloses a method for preparing a high-performance PVDF-based energy storage film based on nanosecond electric pulse induction, the steps of which include: preparing a polyvinylidene fluoride-hexafluoropropylene (P(VDF-HFP) solution, taking an appropriate amount of the solution and evenly dropping it into a cleaned glass groove, and applying different nanosecond electric pulses at a certain temperature. After naturally cooling to room temperature, the film is quenched and then placed in a vacuum drying oven for drying to further remove moisture and residual solvent. The present invention controls the amplitude, pulse width, frequency, pressurization time, vacuum drying time and temperature of the nanosecond electric pulse and customizes the size of the groove, and adopts a solution casting method to obtain β P(VDF‑HFP) films with high phase content and excellent energy storage performance, β The phase content is more than 80%, and the charge and discharge energy density is 14 J / cm 3 , the charge and discharge efficiency can reach more than 60%. The present invention eliminates the complicated secondary process, is simple to operate, greatly saves production costs, and has obvious advantages and application prospects in the preparation of high-performance PVDF-based energy storage films.

The invention discloses a mixed light pumping hyperpolarization nuclear spinning system and method for current measurement, the system comprises a pumping laser light path, a heating laser light path and an alkali metal gas chamber, a signal pickup coil is installed near the gas chamber, the gas chamber is filled with two kinds of alkali metal atoms and nuclear spinning gas atoms 3He, and the densities of the two kinds of alkali metal atoms are different; the heating laser light path is used for emitting laser to heat the gas chamber, and the pumping laser light path is used for emitting pumping laser to the gas chamber so as to utilize spin exchange collision between two alkali metals to hyperpolarize 3He nuclear spin; the signal pickup coil is used for exciting 3He nuclear spin to deviate from the direction of a high-intensity magnetic field to be measured and picking up a nuclear spin precession signal projection magnetic field in the direction perpendicular to the pumping laser; the gas chamber is filled with the two kinds of alkali metal atoms, the overall density of the alkali metal atoms in the gas chamber is improved, nuclear spin can be hyperpolarized by high-density alkali metal electron spin, and finally the polarizability of the nuclear spin is improved.

This invention discloses a mica nanosheet and its preparation method, belonging to the field of two-dimensional nanofiller technology. The preparation method disclosed in this invention involves heat-treating bulk mica, followed by purification in an aqueous nitric acid solution to obtain pretreated mica powder; dispersing the pretreated mica powder in a solvent to obtain a mixed slurry; adding an oxidant to the mixed slurry and stirring the mixture, then adding a small-molecule lithium salt to further react, obtaining a pretreated slurry; adding grinding beads to the pretreated slurry for sand milling to achieve exfoliation; subsequently releasing the exfoliated slurry and performing post-processing to obtain mica nanosheets. This method solves the technical problem of simultaneously achieving efficient, green, and controllable exfoliation, and possesses scalability potential, which is difficult to achieve with existing methods.

The invention discloses a device and a method for collecting combustion products of an aero-engine fuel-rich gas generator, an asbestos fiber material, a zeolite molecular sieve, sandy soil and a filter screen are adopted for multiple filtration, and solid-liquid components in outlet flue gas are filtered and collected; and under the action of the water-cooling coil pipe, the residual outlet flue gas is cooled to a safe temperature, and the low-pressure gas tank is utilized to complete the collection of gas components. The mass of solid-liquid components is obtained by weighing the mass change of the filtering device, the component distribution of gas-phase components is obtained through a gas chromatography detection method, and evaluation and analysis of the combustion condition of the fuel-rich generator are achieved. The material required by the collecting device is stable in performance, low in price and good in usability and service life, and remarkable working and economic benefits can be obtained.