102 results about "Thermogravimetric analysis" patented technology

A quantum dot composite configured to emit green light or red light. The quantum dot composite including a polymer matrix, and a plurality of quantum dots dispersed in the polymer matrix, the plurality of quantum dots include a semiconductor nanocrystal core comprising indium and phosphorus. As determined by differential scanning calorimetry, the quantum dot composite exhibits an intensity of a peak between about 350° C. to about 450° C. that is about 8 times or more and about 13 times or less relative to an intensity of a peak between about 200° C. and about 300° C. in a thermogravimetric analysis graph.

The invention relates to the technical field of composite material performance prediction, and discloses a composite material flame retardant property and thermal stability prediction method based on thermogravimetric analysis and infrared spectrum data fusion. The invention aims to solve the problem that it is difficult to effectively fuse multi-modal data to realize quantitative prediction in the prior art. The method comprises the following steps: firstly, collecting thermogravimetric and infrared spectrum combined data, calculating gas transmission lag time, and carrying out forward correction on infrared spectrum data to realize time sequence alignment; then solid-phase thermogravimetric feature vectors and gas-phase infrared feature vectors are extracted, and a fusion feature matrix is generated; extracting solid-phase and gas-phase characteristics respectively by using a dual-channel LSTM network, and performing weighted fusion based on a self-attention mechanism; and finally, synchronously outputting a flame retardant index predicted value and a flame retardant grade classification result through numerical mapping and classification judgment. According to the method, multi-dimensional feature mining of the whole pyrolysis process of the material is realized, and a rapid and accurate digital evaluation means is provided for screening of the flame-retardant material.

The invention discloses an epoxy resin pyrolysis kinetics optimization method and device. The invention aims to accurately obtain the pyrolysis kinetic parameters (such as activation energy and pre-exponential factors) of the epoxy resin through a TG-FTIR combined technology (thermogravimetric analysis and Fourier transform infrared spectroscopy synchronous monitoring), and optimize the pyrolysis conditions (temperature, heating rate and retention time) based on the dynamic change of the product, so as to obtain the pyrolysis kinetic parameters (such as activation energy and pre-exponential factors) of the epoxy resin. Accurate acquisition of pyrolysis kinetic parameters, improvement of pyrolysis condition optimization efficiency, accurate control of a multi-stage pyrolysis path and balance of energy consumption and product value are realized.

The application provides a cement rotary kiln batching and feeding method for synergistically treating flue gas adsorbents, and relates to the technical field of cement clinker production, and comprises the following steps: sampling flue gas adsorbents for high-temperature thermogravimetric analysis, and establishing a batch fuel characteristic file; calculating a mixed equivalent calorific value according to the calorific values of new and old batches, and adjusting the mixed equivalent calorific value according to the calorific value difference gradient; sampling from a homogenizing bin discharge pipeline for high-temperature thermogravimetric analysis to obtain a measured calorific value and a real-time combustion characteristic index; comparing the measured calorific value with the calibrated mixed equivalent calorific value, and performing corresponding operations according to the deviation degree; establishing a heat load balance model to determine the optimal feeding amount of flue gas adsorbents and coal powder; determining the combustion type according to the real-time combustion characteristic index, and determining the mixing mode of flue gas adsorbents and raw materials, feeding after mixing according to the optimal feeding amount and raw materials, and simultaneously spraying coal powder into the cement rotary kiln. The scheme can improve the temperature stability of the cement rotary kiln, and realizes the recycling of flue gas adsorbents.

The utility model relates to the technical field of microwave equipment, in particular to a microwave thermogravimetric analyzer which comprises a support frame, a furnace body is arranged in the support frame, the upper end of the furnace body is connected with a furnace cover, and the lower end of the furnace body is connected with a bottom sealing plate; a resonant cavity is formed by the furnace body, the furnace cover and the inner space of the sealing plate, and a magnetron for emitting microwaves into the resonant cavity is arranged on the furnace body; a weighing module is further arranged on the bottom sealing plate, a supporting rod is connected to the weighing module, and a weighing tray used for containing materials is arranged at the upper end of the supporting rod; the weighing module is integrated at the bottom of the resonant cavity, so that microwave heating and real-time weighing are synchronously carried out, the technical problem that traditional microwave equipment cannot monitor material mass change is solved, and accurate data support is provided for reaction kinetics research; meanwhile, the resonant cavity adopts a split type design, and the furnace body is provided with a furnace cover and a bottom sealing plate, so that the weighing module is convenient to install and maintain.

The invention provides a thermogravimetric adsorption characterization method and system combining dynamic working condition simulation and an accelerated aging test, and belongs to the technical field of adsorbents. According to the method, the temperature and atmosphere time sequence of a thermogravimetric analyzer is controlled through programming, and initial performance evaluation and long-term service life prediction of the adsorbent are completed in a continuous experiment. The core innovation of the method is that on the basis of simulating the real industrial adsorption-desorption cycle, thermal stress and chemical stress are intelligently applied in the desorption stage, material aging is accelerated, attenuation data are fitted by using an index model, and the service life is scientifically predicted. The technical problems that a traditional method is single in characterization dimension, long in period and disjointed with actual working conditions are solved, and an efficient and reliable platform is provided for rapid and accurate evaluation of the adsorbent.

To provide a composition capable of reducing odor while containing eggshell powder.SOLUTION: The resin composition contains egg shell powder and a polyolefin-based polymer. The eggshell powder contains calcium carbonate as a main component, and the eggshell powder has a weight loss of 0.80 mass% or less from 25 °C to 250 °C when thermogravimetric analysis is performed at a temperature rising rate of 20 °C / min under a nitrogen atmosphere.SELECTED DRAWING: Figure 1

The invention provides a machine-made sand mortar performance regulation and control method based on hydration kinetics, and relates to the technical field of building materials. The method comprises the following steps: preparing and testing machine-made sand with different stone powder contents, gradation and flaky particle contents, determining a standard mix proportion of mortar, and testing the macroscopic performance of the mortar; hydration kinetic parameters are extracted through a hydration heat test, and the content of chemically bound water is obtained through thermogravimetric analysis; establishing a quantitative relation among the machine-made sand parameters, the hydration kinetic parameters and the macroscopic performance by utilizing correlation analysis, and determining key control parameters; and a machine-made sand parameter regulation and control principle taking hydration kinetics as a core is formed. According to the method, the mix proportion design is guided from the microscopic hydration mechanism level, the trial mixing workload is remarkably reduced, and the scientificity and efficiency of the mix proportion design are improved.

The invention discloses a porous carbon composite material prepared through pyrolysis and an application method of the porous carbon composite material in an electrode, and belongs to the technical field of porous carbon composites.The method comprises the following steps that pine sawdust is prepared, a small amount of pine sawdust powder is taken and subjected to thermogravimetric analysis testing in the nitrogen atmosphere, and a thermogravimetric curve and a differential curve of the pine sawdust powder are obtained; determining a temperature interval corresponding to a pyrolysis weightlessness peak; based on a thermogravimetric analysis result, a water-soluble phenolic resin solution and a phosphoric acid solution are blended and mixed, then pine sawdust powder is soaked in the mixed solution, full stirring and ultrasonic treatment are conducted to enable phosphoric acid molecules to be evenly loaded, then drying is conducted, and a pine sawdust precursor pretreated with phosphoric acid is obtained; the problems of pyrolysis conflict, agglomeration and the like in a traditional process are solved, the uniformity, the conductivity and the structural stability of the composite material are improved, the performance consistency of batches is ensured, and the method is suitable for being applied to supercapacitor electrodes.

The present invention provides a catalytic cracking catalyst that exhibits high activity even when containing carbon. [Solution] A catalytic cracking catalyst according to one aspect of the present invention contains zeolite and carbon. The zeolite contains hydrogen atoms, oxygen atoms, aluminum atoms, and silicon atoms, as well as atoms of one or more elements selected from alkali metal elements, alkaline earth metal elements, and transition metal elements, in a specific proportion. The weight loss of the catalytic cracking catalyst in thermogravimetric analysis is 0.01 to 1.5% by weight, based on the weight of the catalytic cracking catalyst.

The application discloses a MOFs synthesis route multi-objective optimization method based on machine learning. The method is to collect the synthesis conditions of prepared Ce-UiO-66, and evaluate the defect content and thermal stability thereof through a thermogravimetric analysis curve, as initial data set; the data set is randomly divided into a training set and a test set, eight algorithms are adopted to model each performance of Ce-UiO-66 and select the proxy model for performance prediction; the target achievement probability (PA) value of each performance in the synthesis space is calculated and expanded into a multi-objective evaluation factor; the Ce-UiO-66 material is prepared; the obtained material is subjected to characterization test, if the test data does not meet the requirement, the data set and the proxy model are updated. The application has the advantages of low cost, short cycle and the like in optimizing the catalytic and stable performances of MOFs based on reliable experimental data and machine learning, and can be popularized to the design of synthesis routes of other materials.

The present invention provides copper foil, an electrode containing the same, a secondary battery containing the same, and a method for manufacturing the same. [Solution] One embodiment of the present invention provides a copper foil comprising a copper film having a matte surface and a shiny surface, and a protective layer on the copper film, wherein the thermogravimetric coefficient is 1.1% or less. The thermogravimetric coefficient is measured using a thermogravimetric analyzer (TGA) in an oxygen atmosphere at a rate of 10°C / min from 25°C to 800°C.

This disclosure provides a negative electrode, an electrochemical device, and an electronic device. The negative electrode includes: a current collector; and an active material layer located on the current collector; wherein the active material layer comprises a silicon-based material, and the minimum mass ratio of silicon element in the active material layer at different locations within the same area is X1, the maximum mass ratio is X2, and the value of X1 / X2 is M, where M ≥ 0.7; wherein the minimum weight loss ratio of the active material layer at different locations within the same area via thermogravimetric analysis (TG) at 800°C is Y1, the maximum weight loss ratio is Y2, and the value of Y1 / Y2 is N, where N ≥ 0.7. This disclosure improves the rate performance and cycle performance of the electrochemical device and reduces the expansion of the electrode assembly by uniformly dispersing the silicon-based material and binder in the active material layer.

This application provides a method for thermogravimetric analysis (TGA) of resin-based composite materials for aero-engine components, belonging to the field of composite material testing technology. The method includes: extracting the operating state points of the aero-engine components; simplifying the operating state points; determining statistical results of the component's operating temperature and operating time for the thermogravimetric analysis based on the simplified operating state points; conducting a preliminary thermogravimetric analysis based on the statistical results of the component's operating temperature and operating time; using the preliminary thermogravimetric analysis results as a benchmark, determining the thermogravimetric trend and the direction for conducting thermogravimetric analysis using a temperature gradient; determining the temperature threshold for thermogravimetric analysis based on the temperature gradient thermogravimetric analysis results; calculating the cumulative thermogravimetric rate of the composite material used in the aero-engine components over the entire engine lifespan by calculating the thermogravimetric rate at each operating temperature above the cumulative temperature threshold; and accelerating the thermal aging of a new test piece to the cumulative thermogravimetric rate to obtain performance loss results.

The invention belongs to the technical field of material analysis, and particularly discloses a sample detection device based on thermogravimetric-infrared combined analysis, which comprises a thermogravimetric analyzer for monitoring the mass change of a to-be-detected sample heated in a carrier gas atmosphere; the infrared spectrometer is used for carrying out structural component analysis on escape gas generated by heating the sample; the sleeve main body is arranged outside a heating furnace in the thermogravimetric analyzer in a sleeving manner, an annular channel is formed between the sleeve main body and the heating furnace, and carrier gas can flow along the annular channel so as to form an air curtain wrapping the heating furnace; the sleeve main body is configured to be matched with the heating furnaces with different outer diameters for use; and the gas conveying pipeline is communicated with the interior of the sleeve main body and a gas pool of the infrared spectrometer so as to convey mixed gas of carrier gas and escaping gas generated by heating a sample. Through the structural design, the infrared spectrum detection signal intensity can be effectively enhanced, and the sample detection accuracy is improved.

A photosensitive resin film and application thereof are provided. When the photosensitive resin film is subjected to a thermogravimetric analysis under the conditions of heating at a rate of 5° C. / min from 40° C. to 200° C. and then keeping the temperature at 200° C. for 10 min, the absolute value of the first derivative of the weight percentage with respect to time within the range of 0 to 40 min is higher than 0.1% / min and not higher than 1.0% / min.

This disclosure relates to a method for evaluating the cyclic adsorption performance of a carbon dioxide adsorbent. The method includes: S1, subjecting the adsorbent to be tested to impurity removal treatment in a thermogravimetric analyzer followed by multiple adsorption-desorption tests to obtain a thermogravimetric cycle curve; S2, obtaining parameters E1, F1, and H based on the thermogravimetric cycle curve and a formula. i and I i S3. Obtain the first and second fitted curves; S4. Based on E1, E i H2, I2, F1, F i The performance of the adsorbent under test can be evaluated using one or more of the first and second fitted curve functions. Using the above method, a relatively standard evaluation method for adsorbent performance based on thermogravimetric analysis can be established. This method allows for the selection of appropriate parameters for qualitative analysis of various adsorbents according to actual usage conditions. By comparing the qualitative analysis results, a suitable adsorbent can be selected, resulting in a wide range of applications and strong applicability.

A method for measuring the chelation degree of a crystalline glycine chelate, comprising: first obtaining the crystal structure of a glycine chelate salt by means of a scanning electron microscope, and determining whether the glycine chelate salt is a crystalline product; then performing characterization by means of Fourier-transform infrared spectroscopy, and determining, on the basis of changes and shifts in peak values, whether a chelation reaction has occurred in the glycine chelate salt; then determining glycine content in the glycine chelate salt by means of high performance liquid chromatography, and using an inductively coupled plasma spectrometer to determine metal element content; and finally determining free water and crystal water of the glycine chelate salt by means of thermogravimetric analysis and summing the glycine content, metal ion content, crystal water, and free water measured in each glycine chelate salt to demonstrate the high-purity characteristic of the product.

Provided is a conductive paste in which voids, cracks, and the like are less likely to occur.　This conductive paste contains metal particles and a solvent. The metal particles contain first nanoparticles having an average particle diameter of 80-500 nm. When thermogravimetric analysis is performed in a nitrogen atmosphere at a temperature warming speed of 10°C / minute from 25°C or lower, items [1] and [2] are satisfied. [1] The residual weight ratio at 120°C is 98% or more [2] The weight reduction ratio Δ 120°C-160°C from 120°C to 160°C is 2.0-5.0%

The present invention relates to a glazing material comprising a substrate coated with a functional coating and a temporary organic protective layer deposited on at least a portion of the functional coating. The protective layer is obtained by crosslinking a polymerizable composition comprising (a) a (meth) acrylate compound and (b) optionally a polymerization initiator. The temporary organic protective layer has a weight loss of greater than 65% by thermogravimetric analysis (TGA) from 30 DEG C to 450 DEG C in air at a heating rate of 10 DEG C / min.

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.

This invention belongs to the field of optical thin film technology for optical devices, and relates to a ligand and a method for modifying metal oxide nanoparticles using this ligand, as well as its applications. This method of modifying metal oxide nanoparticles using a multi-branched ligand containing phosphate groups achieves precise control of reaction conditions and environment through a multi-ligand combination-step reaction modification approach. This results in a richer effect of the surface organic components of the metal oxide nanoparticles, exhibiting more transparent organic dispersion under high concentrations of the same inorganic particles. Furthermore, the multi-branched ligand containing phosphate groups shows higher reactivity with the surface of hydroxylated metal oxide nanoparticles, resulting in a more significant modification effect, with the surface organic ligand accounting for no less than 20% by thermogravimetric analysis.

High purity precursor compositions and related methods are provided herein. The method includes obtaining a metal complex and a reagent. The method includes contacting the metal complex and the reagent to form a reaction product. The reaction product has a purity of at least 85% as determined by a thermogravimetric analysis (TGA) residue at 300° C. The reaction product can be used as a deposition precursor.

The present invention provides a crystalline form Form I of a pyrazolopyrimidine ester compound of the structure of formula (I)This crystalline form has been characterized using X-ray powder diffraction (XRPD), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The present invention also provides methods of preparing the crystalline form Form I of the pyrazolopyrimidine ester compound. This crystalline form allows long-term storage without special requirements in respect of temperature, light, humidity or oxygen presence and is significantly advantageous in terms of stability. Moreover, the methods involve simple steps and provide good reproducibility and excellent purity. Therefore, they have a promising prospect of extensive application.

The invention belongs to the technical field of nano materials, and relates to fullerol with moderate hydroxylation degree and a preparation method and application thereof. Fullerol with the chemical formula of C60 (OH) n.mH2O is obtained by controlling the mass ratio of fullerene to an alkaline reagent and adopting the processes of grinding, dissolving, concentration, alcohol precipitation and drying, n is 10-15, preferably 12, m is 10-15, preferably 12.5, and the product is a needle-like crystal and forms a stable dispersion liquid in water. Thermogravimetric analysis shows that the fullerol has controllable hydroxyl number and relatively high water solubility, has better ABTS < + > and. OH removal capability compared with low-hydroxylated and high-hydroxylated fullerol, can reduce the ROS level in cells and improve the cell survival rate and migration capability, can be used as an active component of an antioxidant and a cell repair preparation, and has a broad application prospect. The composition is used for skin barrier repair and oxidative stress related disease prevention and treatment.

The application discloses a thermogravimetric analysis device and method for high-humidity multi-component atmosphere reaction kinetics research, and belongs to the technical field of thermogravimetric analysis instruments.The device comprises a reaction module, a heating furnace, a weighing module, a gas distribution module and an analysis module; the reaction module is vertically arranged in the heating furnace, and the core is a reaction tube main body which is open at the lower part; the side surface is connected with a gas inlet pipe and a sampling pipe from top to bottom; the weighing module is located below the reaction module and comprises a weighing balance, a water cooling unit and a weighing support rod; the water cooling unit can control the water vapor condensation area and stabilize the balance temperature; the gas distribution module can provide a multi-component reaction atmosphere containing controllable concentration water vapor; and the analysis module can detect the tail gas composition in real time.The application can realize low gas-solid mass transfer resistance, stable control of a high-humidity environment, wide particle size sample measurement and rapid temperature rise and fall, and is suitable for high-humidity multi-component atmosphere gas-solid reaction kinetics research in the fields of combustion, catalysis, adsorption and the like.

This invention provides a method for measuring radiation dose that can be easily measured using readily available materials. [Solution] Using cellulose fibers or a structure made of cellulose fibers, radiation is irradiated onto the dosimeter material, thermogravimetric measurements are performed on the dosimeter material after radiation irradiation, the thermogravimetric rate of the dosimeter material is determined from the results of the thermogravimetric measurements, and the radiation dose corresponding to the thermogravimetric rate at any temperature within the range of 200°C to 300°C is obtained based on the correlation between the thermogravimetric rate and the radiation dose. As shown by arrows A and B in Figure 2, the electron beam irradiation energy (Dose) is estimated from the differential thermogravimetric first derivative rate (DTG).

The invention provides a secondary battery and an electric device. The secondary battery comprises a negative electrode piece, the negative electrode piece comprises a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector, the negative electrode film layer comprises a first region and a second region, and the second region is located between the first region and the negative electrode current collector. The first region comprises a first negative electrode active material, the second region comprises a second negative electrode active material, and the first negative electrode active material comprises a substrate and a carbon coating layer formed on at least part of the surface of the substrate; carrying out a thermogravimetric analysis test on the first negative electrode active material in an air atmosphere, wherein the initial weight loss temperature T0 of the first negative electrode active material is 730-780 DEG C; the second negative electrode active material has a gram volume of 357.0 mAh / g or more. The secondary battery of the present application has improved energy density, dynamic performance and cycle performance.

This invention relates to the field of thermogravimetric analysis technology and discloses a vacuum thermogravimetric analyzer, including an analyzer body. The analyzer body includes a vacuum-sealed balance cavity, which is formed by a top cover and a bottom cavity sealed together. A first gas pipe connector and a second gas pipe connector are located inside the bottom cavity, and a weighing assembly is suspended below the bottom cavity. This design eliminates interference from gas buoyancy, convection, and humidity through the vacuum-sealed cavity, avoiding measurement errors caused by the ambient atmosphere; a shock-absorbing ring isolates external mechanical vibrations, preventing unstable readings; a cooling tank circulates a cooling medium to block thermal radiation, avoiding interference from hot airflow and high-temperature aging of the sealing ring, preventing measurement drift and seal failure; and dual gas pipe connectors enable independent control of the protective gas and reaction gas, preventing sample volatiles from contaminating the balance and overcoming the limitation of not being able to control the atmosphere in separate zones. These improvements collectively enhance the accuracy, stability, and reliability of thermogravimetric analysis.