36 results about "Thermogravimetric analysis" patented technology

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 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.

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.

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%

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 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 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.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has a thermal gravimetric coefficient of 1.005% or less. The thermal gravimetric coefficient is measured using a thermogravimetric analyzer (TGA) in a nitrogen atmosphere, and is measured at a rate of 10° C. / min from 25° C. to 800° C.

The application discloses a kind of polymer stress-aging sensitivity characterization methods under multi-field combined action, belong to dielectric material aging evaluation technical field.The method includes by constructing the molecular chain fracture energy barrier reduction model based on transition state theory, obtain theoretical energy barrier reduction threshold and aging rate constant, calculate to obtain the dynamic life index under different aging time;Based on the polymer sample after aging, by thermogravimetric analysis and Coats-Redfern method constructs thermal decomposition kinetics model, and the activation energy under different aging states is calculated;By comparing and analyzing the change law of life index and activation energy, the comprehensive sensitivity evaluation under the electric-thermal coupling effect is carried out;The physical self-consistency of model is verified by introducing entropy compensation effect thermodynamic equation.The application realizes the comprehensive quantitative characterization of polymer stress-aging sensitivity under electric-thermal combined action, with the advantages of clear physical meaning, can simultaneously characterize electric and thermal stress, clear mechanism explanation and the like.

This invention provides a negative electrode sheet and a battery. The negative electrode sheet includes a current collector, a negative electrode material layer disposed on the surface of the current collector, and multiple tabs connected to one side of the current collector. The material of the negative electrode material layer includes a negative electrode material, which includes a silicon-based material. Along the lead-out direction of the tabs, the portion of the negative electrode material layer closer to the tabs is a first region, and the portion of the negative electrode material layer farther from the tabs is a second region. The compaction density of the negative electrode material layer in the first region is less than that in the second region. The curve of the mass change of the negative electrode material layer with temperature is obtained by thermogravimetric analysis. In the curve, the change rate of the mass measured at the test endpoint compared with the mass measured at 800℃ is the floating silicon content in the negative electrode material layer, denoted as a. The compaction density of the negative electrode layer in the first region is b g / m³. 3 a and b satisfy the relationship: 0.13≤a×b×100≤13.6(I).

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.

This invention relates to a zeolite that, through thermogravimetric analysis (TGA), is heated to 800°C in air at a heating rate of 10°C / min, and held at 800°C for 10 minutes. The resulting zeolite exhibits a weight loss of 1% or more at 800°C (based on the weight at 400°C), a primary particle roundness of 0.800 or more, and a particle size distribution of 3 μm or more (based on volume) of 40% or less. According to this invention, a zeolite can be provided for obtaining resin compositions with low hygroscopicity and low coefficient of thermal expansion after curing, as well as low viscosity and high interstitial penetration.

This invention relates to the field of blast furnace ironmaking technology, and particularly to a method and system for evaluating the reactivity of pulverized coal residue under simulated blast furnace conditions. The method includes drying, grinding, and sieving the pulverized coal sample to be tested, and then feeding it into a high-temperature tubular furnace; setting experimental parameters for the high-temperature tubular furnace to simulate the extreme conditions of the blast furnace tuyeres; collecting prepared standard residue samples; and conducting a gasification reaction test: placing the prepared standard residue samples in a thermogravimetric analyzer and heating them from room temperature to 1100–1500°C at a heating rate of 10–20°C / min under a 100% CO2 atmosphere, or reacting the standard residue samples with CO2 under constant temperature conditions of 1100–1300°C; recording the mass change curve of the sample during the reaction process in real time, and calculating the gasification reactivity index (RCRI) of the residue based on this curve. This invention can accurately and reliably evaluate the gasification reactivity of pulverized coal residue after combustion under simulated blast furnace conditions.

This invention discloses a fully automatic thermogravimetric analysis furnace, comprising a furnace body and a furnace door hinged to one side of the furnace body, with a base at the lower end of the furnace body. The furnace body is characterized by a control mechanism for controlling the opening and closing of the furnace door, a heating assembly mounted on the inner wall of the furnace body, and a balance housed in the base. This invention features a novel design and simple structure. Through multiple insulation methods, it minimizes heat transfer from the furnace body to the base, ensuring the weighing accuracy of the balance during thermogravimetric analysis. Furthermore, the design of the control mechanism and control box allows for automated thermogravimetric analysis in conjunction with robotic arms, meeting the requirements for batch material thermal performance testing.

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 1.005% or less. The thermogravimetric coefficient is measured using a thermogravimetric analyzer (TGA) in a nitrogen atmosphere at a rate of 10°C / min from 25°C to 800°C.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has a thermal gravimetric coefficient of 1.1% or less. The thermal gravimetric coefficient is measured using a thermogravimetric analyzer (TGA) in an oxygen atmosphere, and is measured at a rate of 10° C. / min from 25° C. to 800° C.

This invention discloses a baseline drift prediction and compensation control method and system for a thermogravimetric analyzer. It collects temperature, gas flow rate, and mass signals during the thermogravimetric analysis process, performs preprocessing and experimental stage identification, and constructs sliding time window features based on different stages. These features are input into a time-series prediction model containing mass conservation and buoyancy correction constraints to predict baseline drift and compensate for and correct the mass signals. Simultaneously, error verification is performed, triggering model parameter adjustments and instrument calibration when thresholds are exceeded, achieving closed-loop control. This invention solves the problems of existing technologies relying on blank experiments and having low calibration efficiency.

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.

A method for detecting an object containing recycled plastic materials by qualitative and semi-quantitative detections is revealed, in which observing a yellowing condition of the object using a first light source, and illuminating the object using a second light source for observing a defect amount on the surface image of the object. When a yellowing index of the object is smaller than a standard yellowing index as well as a second defect condition is greater than a first defect condition, and an activation energy value of the object from a thermogravimetric analyzer is smaller than a standard activation energy value, the object does contain recycled plastic materials. Since the spectrums of recycled PET and native PET are different, the object contains recycled PET and the proportion of the recycled PET are determined according to the spectrums of fluorescent spectrum analysis and the difference ratio between the spectrums respectively.

This invention relates to a particulate material consisting of a plurality of composite particles comprising a porous particle framework and a plurality of nanoscale elemental silicon domains located within the pores of the porous particle framework. The porous particle framework comprises micropores and mesopores, wherein the total volume of micropores and mesopores in the porous particle framework as measured by gas adsorption is from 0.5 to 1.8 cm3 / g. The composite particles comprise from 30 to 70 wt% silicon, wherein at least 30 wt% of the silicon is surface silicon as determined by thermogravimetric analysis (TGA); no more than 1.2 wt% of hydrogen; and have a weight ratio of oxygen to silicon of no more than 0.15. The BET surface area of the composite particles is no more than 40 m2 / g.

One embodiment of this disclosure provides a copper foil comprising: a copper film having a matte surface and a glossy surface; and a protective layer disposed on the copper film, wherein the thermogravimetric coefficient of the copper foil is 1.005% or less. The thermogravimetric coefficient is measured using a thermogravimetric analyzer (TGA) under a nitrogen atmosphere at a rate of 10°C / min from 25°C to 800°C.

The application discloses a method for evaluating the adsorption characteristics and reaction mechanism of rubber particles in rubber modified asphalt, which comprises the following steps: 1) preparing rubber modified asphalt; 2) separating the rubber particles in the rubber modified asphalt from the asphalt liquid phase; 3) determining the adsorption preference of the rubber particles to the molecular weight of the asphalt according to a gel permeation chromatogram and determining the adsorption preference of the rubber particles to the functional groups in the asphalt according to a Fourier transform infrared spectrum; and 4) determining the composition change of the rubber particles before and after reaction with the asphalt according to thermogravimetric analysis data. The application can obtain the adsorption characteristics of the rubber particles in the rubber modified asphalt and the mutual reaction mechanism between the rubber particles and the asphalt, and is helpful for the formula optimization and mixing condition design of the rubber modified asphalt.

A polyethernitrile having N repeating units represented by Equation (I) and M repeating units represented by Equation (II), wherein N and M are integers satisfying the relationship 0 < [N / (N+M)] ≤ 1.00, and in thermogravimetric analysis (TG), the weight loss rate when held at the melting point + 30°C in air for 30 minutes is 5% or less, and a polyethernitrile-containing carbon fiber composite comprising said polyethernitrile and carbon fiber.

The present application relates to a kind of bamboo chip and high-density polyethylene mixed material heat preservation pyrolysis process, it relates to biomass and waste plastic resource technology field.The process includes that bamboo chip is mixed with high-density polyethylene according to mass ratio 1:1, the temperature corresponding to maximum pyrolysis rate is determined as peak value heat preservation temperature by multiple heating rate thermogravimetric analysis, linear heating and peak value heat preservation two-stage pyrolysis procedure are used to carry out pyrolysis, and process rationality is verified by multidimensional dynamics and thermodynamics analysis.The present application can be carried out heat preservation treatment at the temperature corresponding to maximum pyrolysis rate, fully utilize the interaction between biomass and plastic, avoid unnecessary later high-temperature heating, to significantly improve pyrolysis oil yield and reduce whole process energy consumption.