13 results about "Thermogravimetry" patented technology

The invention relates to the field of heating characteristics of samples, and particularly provides a macro sample temperature jump type in-situ thermal analysis system and a macro sample temperature jump type in-situ thermal analysis method. The system is characterized in that a driving unit is arranged on a guide rail and is suitable for doing vertical movement along the guide rail; the guide rail is perpendicular to the ground; the tubular electric heating reaction unit is connected with the driving unit, and after the tubular electric heating reaction unit is heated to a target temperature, the driving unit drives the tubular electric heating reaction unit to move to the periphery of the sample placing unit, so that a macro sample in the sample placing unit is instantly heated; the accuracy of analyzing the thermogravimetry of macroscopic samples and the precipitation characteristics of volatile matters in simulated industrial application can be improved; the balance measuring unit is connected above the sample placing unit, and the initial position of the tubular electric heating reaction unit is located at the lower end of the guide rail, so that the sample placing unit and the balance measuring unit are kept stable in the process of placing a macroscopic sample into the sample placing unit, and the weighing error during sample weighing and sample reaction is reduced.

Nanostructures including a first semiconductor nanocrystal including zinc and selenium, and a second semiconductor nanocrystal including a zinc chalcogenide, wherein a composition of the second semiconductor nanocrystal is different from a composition of the first semiconductor nanocrystal,wherein the nanostructures further include tellurium,wherein in the nanostructures, a mole ratio of selenium to tellurium is greater than or equal to about 0.83:1 and less than or equal to about 10:1,wherein a derivative thermogravimetry curve of the nanostructures has an extreme value in a temperature range of greater than or equal to about 250° C. and less than or equal to about 420° C.

The invention discloses a method and system for recycling magnetic powder in oil-based neodymium iron boron cutting fluid, and belongs to the technical field of neodymium iron boron magnetic material recycling. The method comprises the following steps: feeding oil sludge waste generated by neodymium iron boron processing into a flame-proof magnetic separator, sorting out magnetic sludge, and marking and storing in batches; carrying out thermal performance test on the magnetic mud sample, and determining the volatilization temperature of the oil-based cutting fluid and the neodymium iron boron phase transition temperature; and the magnetic mud is placed in a vacuum furnace, the treatment temperature is set according to a key temperature point measured by thermogravimetry, moisture and cutting fluid impurities are removed through two-step heating treatment under the assistance of high-purity argon, and finally the high-purity neodymium-iron-boron magnetic powder is obtained. The invention further provides a recovery system, the high-performance magnetic powder is directly recovered on the premise of avoiding damage to the main phase structure of neodymium iron boron through a synergistic process of magnetic separation, thermogravimetric analysis and vacuum heat treatment, the problems of resource waste and environmental pollution of a traditional wet process and pyrogenic process recovery process are solved, and green cyclic utilization of magnetic materials is achieved.

The present invention relates a particulate composite metal cyanide complex catalyst powder in which the value of A1 / A2 is 0.5 or less as measured by simultaneous thermogravimetry and differential thermal analysis, where A1 is the ratio of the mass decreasing at 30-150°C to the total mass of the composite metal cyanide complex catalyst powder and A2 is the ratio of the mass decreasing at 150-220°C to the total mass of the composite metal cyanide complex catalyst powder.

This positive electrode active material contains a composite oxide that contains the element lithium (Li), the element nickel (Ni), and the element manganese (Mn). Designating W1 as the mass of the positive electrode active material at 400°C as measured by thermogravimetry of the positive electrode active material in an air atmosphere, W2 as the maximum mass of the positive electrode active material at a temperature of from 500°C (inclusive) to 600°C (inclusive) as measured by said thermogravimetry, and SA as the surface area of the positive electrode active material submitted to the thermogravimetric measurement, the ratio (W2-W1) / SA of the mass increase W2-W1 to the surface area SA is not greater than 0.25 g / cm2.

The invention relates to the technical field of diesel engine exhaust particulate matter test and analysis, in particular to a method for quantitatively determining diesel engine exhaust particulate matter components through combination of thermogravimetry and infrared spectroscopy. Diesel oil and lubricating oil in a sample are separated by setting a specific temperature rising program for a synchronous thermal analyzer, then gas introduced into a gas cell is repeatedly measured by using an infrared spectrometer, a series of spectrograms about the change of a C-H bond absorption peak along with time are extracted, and the analysis result is accurate. Characterizing the contents of diesel oil and lubricating oil in the sample by utilizing peak information of a C-H bond; the problem that diesel oil and lubricating oil in the diesel engine soot sample are difficult to separate is solved, the separated diesel oil and lubricating oil are quantitatively analyzed through the infrared spectrometer, the operation method is simple, the detection efficiency is high, and the result is accurate.

A coated active material (100) of the present disclosure includes: a positive electrode active material (11); lithium hydrogen carbonate present on a surface of the positive electrode active material (11); and a coating layer (12) coating at least a portion of the surface of the positive electrode active material (11). The coating layer (12) includes a lithium-containing fluoride. When a mass of the lithium hydrogen carbonate present on the surface of the positive electrode active material (11) is measured by thermogravimetry-mass spectrometry, a proportion R1 of the mass of the lithium hydrogen carbonate in a mass of the positive electrode active material (11) is 130 ppm or more and 580 ppm or less.

The invention discloses an organic carbon and organic matter conversion coefficient determination method, which comprises: S1, selecting a proper amount of rock sample, crushing, and dividing into a sample A and a sample B; s2, determining the content of organic carbon in the sample A; s3, determining the content of organic matters in the sample B; and S4, calculating the conversion coefficient of the organic carbon and the organic matter according to the organic carbon content and the organic matter content. According to the method, the light hydrocarbon content, the soluble organic matter content and the insoluble organic matter content in the rock are respectively measured by comprehensively applying a thermogravimetric method, an extraction method and a chemical separation method, the non-organic matter impurity content in the insoluble organic matter is calculated by applying an X-ray diffraction method so as to calculate the total organic matter content, and the organic carbon content is measured by applying a carbon-sulfur analysis method so as to calculate the total organic matter content. According to the measured organic matter content and the organic carbon content, the conversion coefficient of the organic carbon and the organic matter is finally obtained, and the problem that the conversion coefficient 1.724 in the existing standard cannot meet the requirement for calculating the organic matter content in the stratum rock is solved.

The invention discloses a heated cigarette controlled-release aroma control method based on a Maillard precursor and a product, and belongs to the technical field of novel tobacco products. The variety and number of volatile aroma compounds generated in the heating process can be determined in a targeted mode, and therefore controllable and directional release of aroma is achieved. The invention also provides a method for in-situ analysis of the aroma release process by using a thermogravimetry-instillation microextraction combined technology, and the method is used for optimizing a precursor formula. On the basis of the method, heating cigarette products which present different flavor gradient changes in the smoking process of a single cigarette or trigger different flavors by adjusting the heating temperature and product sets containing various random flavor cigarettes (such as a blind box mode) can be developed. The problem that heated cigarettes are single in taste is effectively solved, and richness and attraction of products are remarkably improved.

Provided is a catalytic cracking catalyst that has high activity even when containing carbon. The catalytic cracking catalyst of the present disclosure contains zeolite and carbon. The zeolite contains hydrogen atoms, oxygen atoms, aluminum atoms, and silicon atoms, and also contains atoms of one or more elements selected from alkali metal elements, alkaline earth metal elements, and transition metal elements, in specific proportions. The weight loss of the catalytic cracking catalyst in thermogravimetry is 0.01-1.5 wt % based on the weight of the catalytic cracking catalyst.

Providing a crystalline form that is stable in the pharmaceutical use environment of a prodrug compound of an amino acid derivative. 【Solution】A crystal of (1R,2R,3R,5R,6R)-2-amino-6-fluoro-3-[(4-fluorophenyl)methoxy]-2-({(1S)-1-[(tricyclo[3.3.1.1 3,7 decane-1-carbonyl)oxy]ethoxy}carbonyl)bicyclo[3.1.0]hexane-6-carboxylic acid having at least one of the physical properties (a) to (c) below. (a) Having peaks at 2θ = 10.8°, 14.5°, 19.4°, and 21.8° in powder X-ray diffraction (Cu-Kα); (b) In the infrared absorption spectrum (ATR method), characteristic absorption bands are at 3310 cm -1 , 1762 cm -1 , 1731 cm -1 , 1583 cm -1 and 1236 cm -1 ; or (c) In differential thermal analysis / thermogravimetry (TG / DTA), an endothermic peak is at 225 - 235 °C.

The invention discloses a method for testing water characteristics of a Prussian blue positive electrode material, and relates to the technical field of instrument analysis. The total water content and the water distribution of the Pram are obtained through thermogravimetric calibration and H-NMR free attenuation curve fitting according to different free attenuation characteristic time of a hydrogen signal and hydrogen in different chemical environments after pulse excitation by utilizing H-NMR (nuclear magnetic resonance). When a Principal blue sample with unknown water characteristics is detected, a free attenuation curve is obtained only through H-NMR detection, and the total water content can be obtained according to the measured marked line; and fitting the free attenuation curve according to the characteristic attenuation time of the detected different types of water to obtain the water distribution of the to-be-detected Pulan sample. Compared with a thermogravimetric method, the test method has the advantages of short test time (only minute level) for obtaining the characteristic result of the Principal blue water, no damage to samples, simple test conditions and operation method, high accuracy and good stability, and is suitable for rapid test of the characteristics of the Principal blue water.

The invention relates to the technical field of solid waste reduction comprehensive utilization, in particular to a method for measuring the magnesium and calcium activation rate of calcined phosphate tailings and application thereof.The method comprises the steps that firstly, the phosphate tailings are calcined at the specific temperature, after the obtained calcined product is stirred with water and heated to be evaporated and crystallized, thermogravimetric analysis is conducted on generated sediment, and a weight loss curve is obtained; calculating the magnesium activation rate by comparing the weight loss ratio difference between the sample to be detected and the reference sample in the interval of 300-400 DEG C; and calculating the calcium activation rate by comparing the weight loss ratio difference in the range of 550-650 DEG C. According to the method, based on different decomposition temperatures of magnesium hydroxide and calcium hydroxide, interference of non-active components such as calcium carbonate and magnesium carbonate can be effectively eliminated, rapid, accurate and specific determination of the magnesium and calcium activation rate after calcination of the phosphate tailings is realized, and a reliable analysis means is provided for resource utilization of the phosphate tailings.