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Thermogravimetric analysis

Tìm thấy 20+ kết quả cho từ khóa "Thermogravimetric analysis"

Characterization and kinetics analysis of the thermal decomposition of the humic substance from hazelnut husk

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The TG-FTIR analysis, performed using a PerkinElmer Pyris STA 600 thermogravimetric analysis &spectrum 1 FTIR spectrometer (PerkinElmer, Inc., Waltham, MA, USA), was conducted to analyze the gases released during the decomposition of the humic substance.TG-FTIR analysis was performed at 25–1000 °C with a heating rate of 10 °Cmin –1 in an air atmosphere. FTIR spectra of the gases transferred from the TG instrument were drawn in the range of 4000–400 cm –1 .

Choline derivatives immobilized on silica to catalyze transesterification reaction for production of glycerophosphocholine

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Fourier transform infrared analysis and thermogravimetric analysis/differential thermal gravimetry indicated that the surface of the γ -aminated silica was covered by choline derivatives and the highest immobilization amount reached 1.1 mmol/g under optimal conditions. With regard to GPC in food or medicine for human use, the immobilization technology can avoid catalyst contamination of the product and increase the safety of the product.

Fuel characteristics and combustion behavior of seaweed-derived hydrochars

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Fuel characteristics and chemical properties of the derived hydrochars were determined using the standard fuel analysis and spectroscopic methods. The combustion behavior of seaweeds and hydrochars was examined via nonisothermal thermogravimetric analysis under air atmosphere. The seaweed-derived hydrochar yields were lower than those of the lignocellulosic-derived hydrochar yields in the literature.

Platinum or nickel nanoparticles decorated on silica spheres by microwave irradiation technique

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The produced silica and supported catalysts were characterized by using BET, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). Multipoint BET surface area, pore size distribution, and pore volume of the silica were analyzed by this technique. The IR spectra of the materials were recorded using a PerkinElmer Spectrum One FT-IR spectrometer.

Characterization and purification of 1,2,4-triazole-containing phthalocyanines synthesized by microwave method and structure elucidation by spectroscopic techniques

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The thermogravimetric behavior of compounds 8–10 was determined by thermogravimetric analysis method in addition to these spectral methods.. 1 Because these chemicals have a large π- conjugated system, they absorb strongly in the visible region (about 670 nm), giving a characteristic blue-green color. 2 Pcs are well known for their high stability to heat and light, large extinction coefficient in the near IR region, controllable redox potentials, and, most importantly, semiconductor properties.

Synthesis and application of polyvinylimidazole-based Brønsted acidic ionic liquid grafted silica as an efficient heterogeneous catalyst in the preparation of quinoxaline derivatives

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These catalysts were characterized by thermogravimetric analysis, FT-IR spectroscopy, and titration. High efficiency of the catalysts along with short reaction times, high yields, easy purification, recyclability, and simple procedure are among the advantages of these catalytic systems.. Key words: Polymeric ionic liquid grafted silica, heterogeneous catalyst, quinoxaline.

Synthesis and characterization of a novel 3-amino-1,2,4-triazole lead(II) coordination polymer

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The thermal decomposition behavior of the complex was investigated between 30 and 700 ◦ C in flowing nitrogen by thermogravimetric analysis (TGA). Heating from 110 to 160 ◦ C led to the loss of an atrz molecule and the observed mass loss was 10.81% (calcd.

Preparation of epoxidized sunflower oil metal soap derivatives and their use as heat stabilizers for polyvinyl chloride

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The thermogravimetric analysis was performed on a thermobalance Mettler Toledo type TGA/SDTA851, in the temperature range of 25 °C to 500 °C, under a nitrogen flow of 40 mL min − 1 , and with a heating rate of 10 °C min − 1. Preparation of PVC films. The samples were prepared using the following amounts: 100 g of PVC stabilized by 5 g of ESO, 1 g of stearic acid as lubricant, 35 g of DEHP as plasticizer, and 3 g of ESO metal soaps. Characterization of PVC films.

Cu(II) immobilized on Fe 3O4@Agarose nanomagnetic catalyst functionalized with ethanolamine phosphate–salicylaldehyde Schiff base: A magnetically reusable nanocatalyst for preparation of 2-substituted imidazolines, oxazolines, and thiazolines

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The chemical structure and detailed morphology of the prepared catalyst were characterized by techniques including Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), and inductively coupled plasma (ICP), which confirmed the functionalization of Fe 3 O 4 @Agarose nanomagnetic catalyst

Synthesis and characterization of halogen-containing aryl amide polymer-clay nanocomposites

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The thermal characterization of the polymers was carried out by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) under nitrogen atmosphere. The increase in residual mass amount (char yield) could imply a reduction in the polymer’s flammability. 17 This showed that the thermal stability of the poly(BrPMAAm) and poly(FPMAAm) was improved using OSMT and OSMT clays incorporated into the polymer matrix.

Improving the mechanical and thermal properties of chlorinated poly(vinyl chloride) by incorporating modified CaCO3 nanoparticles as a filler

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The thermal stability of the CPVC/CaCO 3 nanocomposites was evaluated by thermogravimetric analysis and differential scanning calorimetry. In addition, the surface texture of the CPVC and the dispersion of the CaCO 3 were evaluated using scanning electron microscopy.

Reductant free green synthesis of magnetically recyclable MnFe2O4@SiO2-Ag coreshell nanocatalyst for the direct reduction of organic dye pollutants

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The morphology, composition, and magnetic properties of the resulting MnFe 2 O 4 @SiO 2 -Ag core-shell nanocatalyst were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR).

Glucosamine derived hydrothermal carbon electrodes for aqueous electrolyte energy storage systems

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When looking at the thermogravimetric analysis curves with an inert nitrogen gas in the range of 10–700 °C temperature in Figure 4b, the pure glucosamine has lost approximately 69% of its weight. After 100 °C, high amount of carbons was obtained by GA-1000, GA-750 and GA-500. GA-500, GA-750 and GA-1000 cyclic voltammetry, galvanostatic measurements at (between –0.8 and 0.0) V voltage window were given in Figure 5 and Figure 6, respectively.

Synthesis of new cyclotriphosphazene derivatives bearing Schiff bases and their thermal and absorbance properties

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The thermal stabilities of Schiff base-substituted cyclotriphosphazenes (3a–3d) were determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Their UV absorption spectra, which were measured in different solvent systems, showed that λ max of compounds from 3a–3d shifts to the red region..

Synthesis of Na-, Fe-, and Co-promoted TiO2/multiwalled carbon nanotube composites and their use as a photocatalyst

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Thermogravimetric analyses of the samples were performed at a heating rate of 10 ◦ C/min under airflow from room temperature to 900 ◦ C. The TGA-DSC curves of bare TiO 2 , CNT, and CNT–TiO 2. The residual mass was determined as 70% of the initial weight, which was in parallel with the synthesis protocol. Figure 1 also shows the thermogravimetric analysis of the CNT–TiO 2 sample. Two-step weight loss was observed for CNT–TiO 2 and its promoted version.

A facile approach for the synthesis of porous hematite and magnetite nanoparticles through sol-gel self-combustion

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Thermal decomposition of the dried gel was studied using the thermogravimetric analysis and differential scanning calorimetry (TG/DSC) techniques (TA instrument. The porosity and the specific surface area of the oxides were determined by the BET nitrogen gas adsorption-desorption analysis conducted at 77 K using the Micromeritics ASAP 2020 instrument. The magnetic properties of the produced particles were measured by a Quantum Design PPMS magnetometer.

Synthesis, characterization, and biological evaluation of new copper complexes of naphthyl pyrazole ligands

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Reaction of the ligands with Cu(NO 3 ) 2 x3.5H 2 O gave two new complexes and characterized with magnetic susceptibility, molar conductance, FT-IR, LCMS-MS, ICP-OES, NMR, thermogravimetric analysis, and ESR spectra. The spectral data of the ligands are coordinated to the metal ion through the nitrogen atoms of the pyrazole ring. The X-ray diffraction structures of the compound 1-(2-methylnaphthalen-1-yl)-lH-pyrazole (MeNap-Pz) were determined.

Selective CO methanation over NiO–Al2O3–ZrO2 and Co3O4–Al2O3–ZrO2 catalysts

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Different techniques were used in order to determine the physical properties of the catalysts, namely X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption, thermogravimetric analysis (TGA), temperature programmed reduction (TPR–H 2. BET, multipoint surface areas, pore volumes, and pore diameters of the catalysts were evaluated by a Quantochrome Autosorp 1C/MS device. The oxidation states of the components in the catalyst structure were determined by XPS.

Synthesis, characterization, and biological activity of coordination polymers derived from pyromellitic dianhydride

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Infrared spectra (FT-IR) were obtained from KBr pellets in the range of 4000–400 cm − 1 with a PerkinElmer spectrum GX spectrophotometer (FT-IR). 11 The thermogravimetric analysis studies were carried out with a PerkinElmer thermogravimetry analyzer at a heating rate of 10 ◦ C min − 1 in the temperature range 50–700 ◦ C under nitrogen.

Polyethylene glycol/silica and carbon black/silica xerogel composites as an adsorbent for CO2 capture

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After the structural, morphological, textural, and thermal properties of the silica xerogel composites were investigated by different analyses, CO 2 adsorption capacity and cyclic stability of the xerogel composites were examined with thermogravimetric analysis (TGA).. Preparation of silica xerogel composites. Amine modification of silica xerogel and silica xerogel composites was carried out using the wet impregnation method [27]. Characterization of silica xerogel composites.