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Journal articles on the topic 'Thermal Gravimetric Analysis Mass Spectrometry (TGA-MS)'

Author: Grafiati

Published: 11 December 2022

Last updated: 25 January 2023

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1

Jia, Weijuan, Jessica McLachlan, Jiayan Xu, Seyed M. Tadayyon, Peter R. Norton, and S. Holger Eichhorn. "Characterization of Au and Pd nanoparticles by high-temperature TGA–MS." Canadian Journal of Chemistry 84, no. 7 (2006): 998–1005. http://dx.doi.org/10.1139/v06-108.

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Noble metal nanoparticles (NPs) prepared by a surfactant-free single-phase solution method have been proposed to contain fewer ionic contaminants than similar NPs prepared by a two-phase method. Reported herein is the possible contamination of Au and Pd NPs, prepared by a surfactant-free single-phase method, with Li2CO3 and other Li salts. High-temperature thermal gravimetric analysis measurements coupled with mass spectrometry (TGA–MS) up to 1100 °C were employed to determine the relative amounts of ionic contaminants since protecting thiolate groups and inorganic contaminants were removed in

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2

Ponkratov, Yu V., V. S. Bochkov, K. K. Samarkhanov, I. S. Karambayeva, and S. K. Askerbekov. "Methodology of Corrosion Testing of Nuclear and Fusion Reactors Materials Using TGA/DSC and MS Complex Techniques." Eurasian Chemico-Technological Journal, no. 1 (February 20, 2019): 35. http://dx.doi.org/10.18321/ectj787.

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The behavior of structural materials of nuclear and fusion reactors during operation largely determines their safe and economical work. Structural materials of nuclear and fusion reactors are operating under conditions of interaction with various chemical active elements (gases, vapor-gas mixtures, fission products, etc.) in a wide temperature range; they are subject to high requirements in terms of their thermal and corrosion resistance. This paper presents the new methodology of complex studies on structural materials corrosion resistance of nuclear and fusion reactors with different gases a

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3

Juarez-Perez, Emilio J., Zafer Hawash, Sonia R. Raga, Luis K. Ono, and Yabing Qi. "Thermal degradation of CH3NH3PbI3 perovskite into NH3 and CH3I gases observed by coupled thermogravimetry–mass spectrometry analysis." Energy & Environmental Science 9, no. 11 (2016): 3406–10. http://dx.doi.org/10.1039/c6ee02016j.

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Thermal gravimetric and differential thermal analysis (TG-DTA) coupled with quadrupole mass spectrometry (MS) and first principles calculations were employed to elucidate the chemical nature of released gases during the thermal decomposition of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>.

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4

Chen, Zhi Qin, Yang Fei Chen, and Hong Bo Liu. "Study on Thermal Degradation of Phenolic Resin." Applied Mechanics and Materials 422 (September 2013): 24–28. http://dx.doi.org/10.4028/www.scientific.net/amm.422.24.

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The thermal degradation of phenolic formaldehyde resins (PF) were studied using thermo gravimetric analysis (TGA). The evolved volatiles during thermal degradation of PF were examined by mass spectrometry (MS). The structure changes of thermal degradation of synthetical phenolic resin (PF1.2) and commercial resin (CPF) were investigated by solid-state 13C nuclear magnetic resonance (13C-NMR) techniques. The experimental results show that the degradation process of PF could be separated into three stages. In the first stage, ether bonds and unreacted terminal hydroxymethyl groups of the cured r

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Zhou, Quan, Dongfang Zheng, Yong Zhao, Ting Wang, Yafeng Yang, and Muhammad Ashraf. "Active constituents of Litsea cubeba." Thermal Science 24, no. 3 Part A (2020): 1745–52. http://dx.doi.org/10.2298/tsci190526047z.

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Litsea cubeba is a plant of Lauraceae and Litsea. It is a valuable plant and has a wide range of uses, including in traditional Chinese medicine. Herein, Litsea cubeba wood was harvested from Henan Province, The active ingredients were extracted from Litsea cubeba wood by modern techniques such as gas chromatography-mass spectrometry (GC-MS), thermal gravimetric analysis, and thermal desorption gas chromatography-mass spectrometry. The analysis results show that the wood of Litsea cubeba contains a large amount of valuable active substances that can be utilized in medicine, bio-energy, and spi

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Maddock, John, Xinchen Kang, Lifei Liu, Buxing Han, Sihai Yang, and Martin Schröder. "The Impact of Structural Defects on Iodine Adsorption in UiO-66." Chemistry 3, no. 2 (2021): 525–31. http://dx.doi.org/10.3390/chemistry3020037.

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Radioactive I2 (iodine) produced as a by-product of nuclear fission poses a risk to public health if released into the environment, and it is thus vital to develop materials that can capture I2 vapour. Materials designed for the capture and storage of I2 must have a high uptake capacity and be stable for long-term storage due the long half-life of 129I. UiO-66 is a highly stable and readily tuneable metal-organic framework (MOF) into which defect sites can be introduced. Here, a defective form of UiO-66 (UiO-66-FA) was synthesised and the presence of missing cluster moieties confirmed using co

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7

YEŞİL, Tolga Acar, Ömer DİLEK, Tahir TİLKİ, and Mustafa YAVUZ. "Synthesis, Characterization and Investigation of Electrical Conductivity of Poly(2-Oxo-2-Phenyl Ethyl -2-Amino Benzoate)/Bentonite Nanocomposite." Süleyman Demirel Üniversitesi Fen Edebiyat Fakültesi Fen Dergisi 17, no. 2 (2022): 568–76. http://dx.doi.org/10.29233/sdufeffd.1148894.

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This study was carried out in two stages. In the first stage; 2-oxo-2-phenylethyl-2-aminobenzoate (OPA) compound, which was an aniline derivative, was synthesized by starting the appropriate components. Then, poly(OPA) was obtained via chemical polymerization of the OPA in the presence of ammonium peroxydisulfate (APS) as the initiator and DMF as the solvent. Poly(OPA)/Bentonite (BNT) nanocomposite was synthesized by effectively dispersing the inorganic nanolayers of BNT in poly(OPA) matrix by means of intercalation method. In the second stage; the characterization of the synthesized OPA, poly

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8

Kahraman, Wang, von Irmer, Gallei, Hey-Hawkins, and Eren. "Synthesis and Characterization of Phosphorus- and Carborane-Containing Polyoxanorbornene Block Copolymers." Polymers 11, no. 4 (2019): 613. http://dx.doi.org/10.3390/polym11040613.

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Grubbs-catalyzed ring-opening metathesis polymerization (ROMP) of carborane- and phosphonate-containing monomers has been used for the generation of hybrid block copolymers. Molecular weights with Mn of 50,000 g/mol were readily obtained with polydispersity index values, Đ, between 1.03–1.08. Reaction of the phospha ester and carborane substituted oxanorbornene block copolymer with trimethylsilyl bromide led to a new polymer with phosphonic acid functionalities. In application studies, the phospha-carborane functionalized block polymer was tested as heat resistance material. Thermal stability

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9

Kirilova, Alise, Aleksandrs Pučkins, Sergey Belyakov, and Elena Kirilova. "3-[N-(4-Methoxybenzyl)amino]benzo[de]anthracen-7-one." Molbank 2021, no. 4 (2021): M1287. http://dx.doi.org/10.3390/m1287.

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Herein, we describe the synthesis of 3-[N-(4-methoxybenzyl)amino]benzo[de]anthracen-7-one via a two-step procedure including 3-aminobenzanthrone condensation with anisaldehyde and following reduction of obtained imine to appropriate amine by sodium borohydride. The structure of the synthesized compounds was established by elemental analysis, nuclear magnetic resonance spectroscopy, mass spectrometry (EI-MS), and infrared spectroscopy (FT-IR) and confirmed by single-crystal X-ray diffraction. The title compound was analyzed by thermal gravimetric analysis, UV/vis, and fluorescence spectroscopy.

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10

Liu, Jie, Youxi Zhao, Mengjie Diao, et al. "Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Production by Rhodospirillum rubrum Using a Two-Step Culture Strategy." Journal of Chemistry 2019 (August 4, 2019): 1–8. http://dx.doi.org/10.1155/2019/8369179.

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Polyhydroxyalkanoates (PHAs) are microbially synthesized biopolyesters which have attracted great attentions as a new biological material, potential alternative to traditional fossil fuel-based plastic due to their biodegradability and biocompatibility. Poly-3-hydroxybutyrate (PHB) and poly-(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) are the most common members of PHAs. In this study, the nonsulfur and facultatively phototrophic bacterium Rhodospirillum rubrum was cultivated to accumulate PHA by a two-step culture strategy. Gas chromatography (GC), gas chromatography-mass spectrometry (GC-

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11

Thakur, Sujeet Kumar, Saibal Saha, Prasenjit Guchhait, and Sambasivan Venkat Eswaran. ""Fullarazirman" Nano Water Soluble Fullerene C60-Manganese (II) Tri-Adduct Complex with Anti-Cancer Activity Comparable to Doxorubicin." Journal of Biomedical Nanotechnology 16, no. 4 (2020): 481–91. http://dx.doi.org/10.1166/jbn.2020.2908.

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There is continued interest in Nano Carbon Materials (NCMs) and two of these, Fullerene C60 and Graphene have received Nobel prizes. Low solubility in most solvents has been a stumbling block in their industrial use. We report here the successful synthesis of a new water soluble tri-adduct of Fullerene C60 using a two-step procedure to obtain the water soluble s-Tri-(1-aziridino-2, 3-dimethoxy-benzene-5-carboxylato-6-carboxylic acid)-H-Fullerene C60-Manganese (II) Complex ( III ). Matrix Assisted Laser Desorption Ionization Mass Spectrometry (MALDI-MS) and Electron Paramagnetic Resonance (EPR)

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12

Li, Zijie, Yusheng Chen, Pan Ye, et al. "Microwave-Assisted Classic Ullmann C–C Coupling Polymerization for Acceptor-Acceptor Homopolymers." Polymers 11, no. 11 (2019): 1741. http://dx.doi.org/10.3390/polym11111741.

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Developing cheap, clean and atomic-efficient synthetic methodologies for conjugated polymers are always critical for the field of organic electronics. Herein, classic Ullmann coupling polymerization is developed to synthesize a series of Acceptor-Acceptor (A-A) type homopolymers with microwave-assistance, which are supported by nuclear magnetic resonance (NMR), matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF), elemental analysis (EA) and gel permeation chromatography (GPC). The physicochemical properties of these polymers are studied by UV-vis spectrosco

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13

Bhide, Malavika A., Joe A. Manzi, Caroline E. Knapp та Claire J. Carmalt. "Synthetic and Structural Studies of Ethyl Zinc β-Amidoenoates and β-Ketoiminates". Molecules 26, № 11 (2021): 3165. http://dx.doi.org/10.3390/molecules26113165.

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A set of heteroleptic ethyl zinc β-amidoenoates (1, 2) and β-ketoiminates (3) of the form [LZnEt]2 with varying steric bulk have been synthesised via the reaction of diethylzinc with β-aminoenoate ligands HL1 and HL2 and β-ketoimine HL3. These complexes have been characterised via 1H and 13C NMR, mass spectrometry and single-crystal X-ray diffraction, which unambiguously determined all three structures as dimeric species in the solid state. We observe the unusual dimerisation of 1 and 2 through coordination of the central zinc atom to the methine carbon of the second monomer, which gives these

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14

Dat Mai, Ngoc Xuan, Tan Le-Hoang Doan, Le Nguyen Bao Thu, and Bach Thang Phan. "EvaluationofremovalefficiencyofFe(III)andAl(III)ionsinacidsulfate waterusing agarose-basedmagnesiumoxidecomposite." Ministry of Science and Technology, Vietnam 63, no. 3 (2021): 30–34. http://dx.doi.org/10.31276/vjste.63(3).30-34.

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Agarose/MgO composite adsorbents were developed through interspersing MgO nanoparticles with agarose to create an absorbent. The elimination capacity of the composite towards iron (Fe), aluminium (Al), and arsenate (As) in acid sulfate water was evaluated by means of batch method at room temperature. The constituents of the composite were characterized by thermal gravimetric analysis (TGA). The removal efficiency was determined through inductively coupled plasma (ICP) mass spectrometry. The composite adsorbent exhibited an excellent adsorption capacity towards three types of ions and heavy met

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15

Smith, Aaron, Farukh Ali, and Dmitriy Soldatov. "Structure and stability of solid oligoglycines." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C921. http://dx.doi.org/10.1107/s2053273314090780.

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Although peptides have been extensively studied within many disciplines, their solid state chemistry is not sufficiently explored. Crystalline peptide materials could present new opportunities in solid state organic synthesis as well as pharmaceutical, cosmetic and food industries. In order to facilitate these future applications, a better understanding of the relationship between the solid state structure and chemical reactivity in peptide crystals is required. In this work, a series of linear glycine oligomers was studied to see how their crystal structure and thermal reactivity changes with

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16

Adamiano, Alessio, Isidoro Giorgio Lesci, Daniele Fabbri, and Norberto Roveri. "Adsorption of bovine serum albumin onto synthetic Fe-doped geomimetic chrysotile." Journal of The Royal Society Interface 12, no. 107 (2015): 20150186. http://dx.doi.org/10.1098/rsif.2015.0186.

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Synthetic stoichiometric and Fe-doped geomimetic chrysotile nanocrystals represent a reference standard to investigate the health hazard associated with mineral asbestos fibres. Experimental evidence suggests that the generation of reactive oxygen species and other radicals, catalysed by iron ions at the fibre surface, plays an important role in asbestos-induced cytotoxicity and genotoxicity. In this study, structural modification of bovine serum albumin (BSA) adsorbed onto synthetic chrysotile doped with different amounts of Fe has been investigated by Fourier transform infrared spectroscopy

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17

Yao, Yong-Gang, Wen-Yue Wang, Li-Yan Chen, et al. "Structural changes of cellulosic polysaccharides in sesame hull during roasting at various temperatures." Quality Assurance and Safety of Crops & Foods 13, no. 2 (2021): 13–24. http://dx.doi.org/10.15586/qas.v13i2.876.

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This article reports a study of the degradation of roasted sesame hulls cellulosic polysaccharides contribution to the Maillard and caramelization reaction. In the present study, cellulosic polysaccharides were extracted from sesame hulls before and after roasting at various temperatures (160, 180, 200, and 220 °C). The structural vari-ations of the cellulosic polysaccharides were elucidated by using the techniques: scanning electron microscope (SEM), high-performance anion-exchange chromatography, Fourier transform (FT-IR) spectrometer, carbon-13 nuclear magnetic resonance (CP/MAS 13C-NMR), a

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18

Ruiu, Andrea, Cécile Bouilhac, Olinda Gimello, et al. "Synthesis and Phase Behavior of a Platform of CO2-Soluble Functional Gradient Copolymers Bearing Metal-Complexing Units." Polymers 14, no. 13 (2022): 2698. http://dx.doi.org/10.3390/polym14132698.

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The synthesis and characterization of a platform of novel functional fluorinated gradient copolymers soluble in liquid and supercritical CO2 is reported. These functional copolymers are bearing different types of complexing units (pyridine, triphenylphosphine, acetylacetate, thioacetate, and thiol) which are well-known ligands for various metals. They have been prepared by reversible addition–fragmentation chain-transfer (RAFT) polymerization in order to obtain well-defined gradient copolymers. The copolymers have been characterized by proton nuclear magnetic resonance (1H-NMR) spectroscopy, m

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19

Yang, Xiao, Naihao Chen, Shengbo Ge, et al. "Components Interaction of Cotton Stalk under Low-Temperature Hydrothermal Conversion: A Bio-Oil Pyrolysis Behavior Perspective Analysis." Polymers 14, no. 20 (2022): 4307. http://dx.doi.org/10.3390/polym14204307.

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The conversion of agricultural and forestry waste biomass materials into bio-oil by mild hydro-thermal technology has a positive effect on extending the agricultural industry chain and alleviating the world energy crisis. The interaction investigation of biomass components during bio-oil formation can be significant for the efficient conversion of lignocellulose when different raw materials are fed together. In this paper, a bio-oil pyrolysis behavior (thermogravimetric analysis, TG) perspective component interaction investigation of cotton stalks under low-temperature hydro-thermal conversion

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20

AlShamaileh, Ehab, Mohammad Alrbaihat, Iessa Moosa, et al. "Mechanochemical Preparation of a Novel Slow-Release Fertilizer Based on K2SO4-kaolinite." Agronomy 12, no. 12 (2022): 3016. http://dx.doi.org/10.3390/agronomy12123016.

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In this study, a novel slow-release fertilizer (SRF) consisting of kaolinite and K2SO4 was prepared, employing the process of mechanochemical milling in a planetary ball mill. To obtain the optimum milling time and speed, several samples were made at fixed mass ratios of kaolinite: K2SO4 (3:1). The milling rotational speed ranged from 200 to 700 rpm for 120 min. Different milling times ranging from 60 to 180 min at fixed 600 rpm milling speed were also investigated to evaluate the incorporation of K2SO4 and to measure the liberation of K+ and SO42− ions into solution. The properties of the stu

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21

Munyai, Shonisani, Louisa M. Mahlaule-Glory, and Nomso Charmaine Hintsho-Mbita. "Green synthesis of Zinc sulphide (ZnS) nanostructures using S. frutescences plant extract for photocatalytic degradation of dyes and antibiotics." Materials Research Express 9, no. 1 (2022): 015001. http://dx.doi.org/10.1088/2053-1591/ac4409.

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Abstract Pollutants such as dyes and pharmaceuticals have become a problem in the environment, thus there is a need to find multifunctional materials that are safe and can be used for the removal of various pollutants. In this study, we report on the synthesis of Zinc sulphide (ZnS) nanostructures and their use as photocatalysts for the degradation of dyes and various antibiotics. Fourier transform infrared spectroscopy (FTIR) confirmed the functional groups found in plants and these were linked to the biomolecules identified through Liquid chromatography-mass spectrometry (LCMS). Ultraviolet-

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22

El-Safty, Samy M., Nadia El-Wakiel, Gehan El-Oleimy, Mohamed Gaber, and Yusif S. El-Sayed. "Microhardness and Fluoride Release of Glass Ionomer Cement Modified with a Novel Al+3 Complex to Enhance Its Antimicrobial Activity." International Journal of Biomaterials 2021 (October 23, 2021): 1–12. http://dx.doi.org/10.1155/2021/1925388.

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Objectives. To synthesize and characterize a novel Al+3 complex with 2-(2-hydroxyphenyl)-1H-benzimidazole (HL) to be added to a restorative glass ionomer cement (GIC) to enhance its antimicrobial activities and to evaluate the Vickers microhardness (HV) and fluoride release (FR) of the modified GIC. Materials and Methods. Al+3 complex was synthesized by the addition of 1 mmol (0.210 g) of HL to 1 mmol (0.342 g) of aluminum sulfate in ethanol. The resulting solution was then refluxed under stirring for 24 h and then collected by filtration and dried in a vacuum desiccator over an anhydrous CaCl

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23

Giongo, Janice Luehring, Rodrigo De Almeida Vaucher, Aline Ourique, et al. "DEVELOPMENT OF NANOEMULSION CONTAINING PELARGONIUM GRAVEOLENS OIL: CHARACTERIZATION AND STABILITY STUDY." International Journal of Pharmacy and Pharmaceutical Sciences 8, no. 12 (2016): 271. http://dx.doi.org/10.22159/ijpps.2016v8i12.15108.

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<p><strong>Objective: </strong>To develop, characterize and evaluate the stability of nanoemulsions containing geranium oil (NEG) at different temperatures (4 °C, 25 °C and 45 °C) for 90 d.</p><p><strong>Methods: </strong>The quantification of oil in the nanostructure was performed by <a href="https://www.google.com.br/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=1&amp;cad=rja&amp;uact=8&amp;ved=0ahUKEwiYjL3Niv7OAhVJI5AKHZ-_AeUQFggfMAA&amp;url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FGas_chromatograph

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Liu, Shan Shan, Ji Yue Hu, Dan Qin, et al. "Analysis of the Volatile Organic Compounds (VOCs) during the Regeneration of Post-Consumed Poly(Ethylene Terephthalate) Using HS-GC-MS Method." Materials Science Forum 944 (January 2019): 1208–14. http://dx.doi.org/10.4028/www.scientific.net/msf.944.1208.

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VOCs emissions from recycled PET are recognized as one of the major causes of poor healthy condition. Much attention has been increasingly focused on VOCs produced from regenerated PET for their significance in ecological safety. These emissions may be strongly influenced by the raw materials and manufacturing techniques of the recycled PET. However, there is very little published information regarding this issue. The purpose of this study was to examine VOCs releasing from reprocessed productions when exposed to high temperature or other extreme conditions.In this study, we determined and com

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25

Abril, Mirabal-Gallardo, González, et al. "Comparison of the Oxidative Stability and Antioxidant Activity of Extra-Virgin Olive Oil and Oils Extracted from Seeds of Colliguaya integerrima and Cynara cardunculus Under Normal Conditions and After Thermal Treatment." Antioxidants 8, no. 10 (2019): 470. http://dx.doi.org/10.3390/antiox8100470.

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We investigated the potential of two oil extracts from seeds of Colliguaya integerrima (CIO) and Cynara cardunculus (CO) to use as nutritionally edible oils. For this purpose, oil quality was accessed by determining the fatty acid composition, peroxide value, acid value, iodine value, saponification number, phenolic contents, and oxidative stability during thermally induced oxidation of CIO and CO oils and compared to those of extra-virgin olive oil (EVOO). The chemical composition results demonstrated that both oils could be nutritional sources of essential unsaturated fatty acids. Moreover,

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26

Gottschalk, Torben, Boris Bensmann, and Richard Hanke-Rauschenbach. "Influence of Seawater Cation Contamination on the Performance and Lifetime of PEM Electrolysis Cells." ECS Meeting Abstracts MA2022-02, no. 44 (2022): 1637. http://dx.doi.org/10.1149/ma2022-02441637mtgabs.

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Polymer electrolyte membrane water electrolysis (PEMWE) requires highly purified water (resistivity ≥ 1 MOhm·cm). If the electrolyzer is fed with water of poor quality, both the lifetime and the performance are reduced. [1] Mainly cationic species cause several degradation effects in the membrane and the catalyst layer of the cell. Within the membrane, protons are exchanged by the cations, leading to a reduced ionic conductivity. Further, according to Fenton's reaction, some transition metal cations catalyze the formation of radicals attacking the membrane structure. [2] Additionally, the cata

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27

Manic, Nebojsa, Bojan Jankovic, Dragoslava Stojiljkovic, Vladimir Jovanovic, and Milos Radojevic. "TGA-DSC-MS analysis of pyrolysis process of various agricultural residues." Thermal Science 23, Suppl. 5 (2019): 1457–72. http://dx.doi.org/10.2298/tsci180118182m.

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Slow pyrolysis (gradual heating over a wide range of temperatures) characteristics of various biomasses (corn brakes, wheat straw, and hazelnut shell) were investigated by simultaneous thermal analysis (STA-TGA-DTG-DSC), coupled with mass spectrometry. Thermal decomposition of these samples was divided into three stages corresponding to removal of water, devolatilization, and formation of bio-char. It was found that differences in thermal behavior of the samples are due to differences in their composition. The mass spectrometry results showed that H2, CH4 , H2O, CO2 (C3H8), CO, and C2H6were ma

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Hao, Weizhe, Xuejun Zhang, and Yanhong Tian. "Thermal, Mechanical, and Microstructural Study of PBO Fiber during Carbonization." Materials 12, no. 4 (2019): 608. http://dx.doi.org/10.3390/ma12040608.

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Poly(p-phenylene benzobisoxazole) (PBO) fiber shows fascinating properties including excellent mechanical performance, high crystallinity, and fairly good heat resistance as a kind of polymer fiber. Its properties make it a possible candidate as a precursor of carbon fiber. This paper mainly investigates the possibility of yielding carbon fiber from PBO by direct carbonization using a continuous process and multiple properties of yielded fiber treated under different heat treatment temperature (HTT). The results show that PBO fiber was able to sustain an HTT as high as 1400 °C under the inert

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Schwerdt, Ian J., Casey G. Hawkins, Bryan Taylor, Alexandria Brenkmann, Sean Martinson, and Luther W. McDonald IV. "Uranium oxide synthetic pathway discernment through thermal decomposition and morphological analysis." Radiochimica Acta 107, no. 3 (2019): 193–205. http://dx.doi.org/10.1515/ract-2018-3033.

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Abstract Many commercial processes exist for converting uranium from ore to the desired uranium compound for use in nuclear power or nuclear weapons. Accurately determining the processing history of the uranium ore concentrates (UOCs) and their calcination products, can greatly aid a nuclear forensics investigation of unknown or interdicted nuclear materials. In this study, two novel forensic signatures, based on nuclear materials synthesis, were pursued. Thermogravimetric analysis – mass spectrometry (TGA-MS) was utilized for its ability to discern UOCs based on mass changes and evolved gas s

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Clausen, Per Axel, Vivi Kofoed-Sørensen, Asger W. Nørgaard, Nicklas Mønster Sahlgren, and Keld Alstrup Jensen. "Thermogravimetry and Mass Spectrometry of Extractable Organics from Manufactured Nanomaterials for Identification of Potential Coating Components." Materials 12, no. 22 (2019): 3657. http://dx.doi.org/10.3390/ma12223657.

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Manufactured nanomaterials (MNMs) often have a surface-chemical modification in order to tailor their physicochemical properties, including also powder properties and miscibility. Surface-chemical modifications may influence the toxicological properties of the MNM, but the specific chemistry and extent are rarely described in detail in suppliers’ technical data sheets. Chemical and quantitative information on any surface-chemical treatment, coating and functionalization are required for chemicals registration in Europe. Currently there is no globally accepted and documented approach to generat

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Zedler, Łukasz, Marek Klein, Mohammad Reza Saeb, Xavier Colom, Javier Cañavate, and Krzysztof Formela. "Synergistic Effects of Bitumen Plasticization and Microwave Treatment on Short-Term Devulcanization of Ground Tire Rubber." Polymers 10, no. 11 (2018): 1265. http://dx.doi.org/10.3390/polym10111265.

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Ground tire rubber (GTR) was mechano-chemically modified with road bitumen 160/220 and subsequently treated using a microwave radiation. The combined impact of bitumen 160/220 content and microwave treatment on short-term devulcanization of GTR was studied by thermal camera, wavelength dispersive X-ray fluorescence spectrometry (WD-XRF), static headspace, and gas chromatography-mass spectrometry (SHS-GC-MS), thermogravimetric analysis combined with Fourier transform infrared spectroscopy (TGA-FTIR), oscillating disc rheometer and static mechanical properties measurements. The obtained results

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Hu, Xiao Ping, Yu Yang Guo, Quan Min Xu, Hui Min Heng, and Liang Jun Li. "Synthesis of a Novel Intumescent Flame Retardant Oligomer and its Application in ABS Copolymer." Advanced Materials Research 391-392 (December 2011): 204–8. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.204.

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A novel intumescent flame retardant oligomer containing phosphorous-nitrogen structure (PSPTR) was synthesized and characterized by Fourier Transform Infrared (FTIR) and Mass Spectrometry (MS). The thermal behavior of PSPTR was investigated by thermogravimetric analysis (TGA). The TGA data shows that PSPTR has a high initial temperature of thermal degradation and a high char residue of 41.18wt% at 700 . A novel intumescent ﬂame retardant (IFR) system, which is composed of PSPTR and novolac phenol (NP), was used to impart ﬂame retardancy of ABS. The combustion behaviors of the ABS/IFR composite

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Alam, M., N. M. Alandis, E. Sharmin, N. Ahmad, B. F. Alrayes, and D. Ali. "Characterization of Leucaena (Leucaena leucephala) oil by direct analysis in real time (DART) ion source and gas chromatography." Grasas y Aceites 68, no. 2 (2017): 190. http://dx.doi.org/10.3989/gya.0939162.

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For the first time, we report the characterization of triacylglycerols and fatty acids in Leucaena (Leucaena leucephala) oil [LUCO], an unexplored nontraditional non-medicinal plant belonging to the family Fabaceae. LUCO was converted to fatty acid methyl esters (FAMEs). We analyzed the triacylglycerols (TAGs) of pure LUCO and their FAMEs by time-of-flight mass spectrometry (TOF-MS) followed by multivariate analysis for discrimination among the FAMEs. Our investigations for the analysis of LUCO samples represent noble features of glycerides. A new type of ion source, coupled with high-resoluti

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Wang, Bao, Yujie Li, Jianan Zhou, et al. "Thermogravimetric and Kinetic Analysis of High-Temperature Thermal Conversion of Pine Wood Sawdust under CO2/Ar." Energies 14, no. 17 (2021): 5328. http://dx.doi.org/10.3390/en14175328.

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The gasification behavior of pine wood sawdust was investigated in CO2 with different heating rates of 5, 10, 15, and 20 °C/min from room temperature to 1400 °C by thermogravimetric analysis (TGA) and mass spectrometry (MS). It was also examined under Ar to compare the differences observed under CO2 at heating rate of 10 °C/min. Kinetics of pine wood sawdust thermal decomposition was determined by the models of FWO, KAS and master plot method. TGA results revealed different reaction sections from pyrolysis to char gasification under CO2. The pyrolysis behavior was similar under CO2 and Ar and

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Zedler, Łukasz, Daria Kowalkowska-Zedler, Henri Vahabi, et al. "Preliminary Investigation on Auto-Thermal Extrusion of Ground Tire Rubber." Materials 12, no. 13 (2019): 2090. http://dx.doi.org/10.3390/ma12132090.

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Ground tire rubber (GTR) was processed using an auto-thermal extrusion as a prerequisite to green reclaiming of waste rubbers. The reclaimed GTR underwent a series of tests: thermogravimetric analysis combined with Fourier-transform infrared spectroscopy (TGA-FTIR), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and static headspace and gas chromatography-mass spectrometry (SHS-GC-MS) in order to evaluate the impact of barrel heating conditions (with/without external barrel heating) on the reclaiming process of GTR. Moreover, samples were cured to assess th

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Huber, Trisha A., Michael C. Kopac, and Catherine Chow. "The quantitative removal of metal catalyst from multi-walled carbon nanotubes with minimal tube damage." Canadian Journal of Chemistry 86, no. 12 (2008): 1138–43. http://dx.doi.org/10.1139/v08-160.

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A purification method for multi-walled carbon nanotubes (MWCNTs) has been developed to remove almost all (>98%) residual metal catalyst without introducing a significant amount of surface functionality. The process involves alternating mild acid oxidation and thermal oxidation in an iterative fashion with progressively higher temperatures for thermal treatment, in accordance with the increasing thermal stability. Thermogravimetric analysis and inductively coupled plasma mass spectrometry were employed to assess thermal stability and residual catalyst content, respectively, throughout the pr

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Xu, Jiajia, Yu Zhang, Yunfang Shen, et al. "New Perspective on Wood Thermal Modification: Relevance between the Evolution of Chemical Structure and Physical-Mechanical Properties, and Online Analysis of Release of VOCs." Polymers 11, no. 7 (2019): 1145. http://dx.doi.org/10.3390/polym11071145.

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Thermal modification (TM) is an ecological and low-cost pretreated method to improve the dimensional stability and decay resistance of wood. This study systematically investigates the relevance between the evolution of chemical structure and the physical and mechanical properties during wood thermal modification processes. Moreover, the volatility of compounds (VOCs) was analyzed using a thermogravimetric analyzer coupled with Fourier transform infrared spectrometry (TGA-FTIR) and a pyrolizer coupled with gas chromatography/mass spectrometer (Py-GC/MS). With an increase of TM temperature, the

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Madajska, Katarzyna, and Iwona Barbara Szymańska. "New Volatile Perfluorinated Amidine–Carboxylate Copper(II) Complexes as Promising Precursors in CVD and FEBID Methods." Materials 14, no. 12 (2021): 3145. http://dx.doi.org/10.3390/ma14123145.

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In the present study, we have synthesised and characterised newly copper(II) complexes with the general formula [Cu2(NH2(NH=)CC2F5)2(µ–O2CRF)4], where RF = CF3, C2F5, C3F7, C4F9. Infrared spectroscopy, mass spectrometry with electron ionisation (EI MS), and density-functional theory (DFT) calculations were used to confirm compounds’ composition and structure. The volatility of the compounds was studied using thermal analysis (TGA), EI MS mass spectrometry, variable temperature infrared spectroscopy (VT IR), and sublimation experiments. Research has revealed that these compounds are the source

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Medvedevskikh, M. Yu, M. P. Krasheninina, A. S. Sergeeva, and O. S. Shokhina. "A reference installation based on thermo-gravimetric analysis with mass-spectrometric detection as a part of the state primary standard GET 173." Industrial laboratory. Diagnostics of materials 84, no. 6 (2018): 63–70. http://dx.doi.org/10.26896/1028-6861-2018-84-6-63-68.

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The issue of assuring the traceability of the results of water determination in solid and liquid substances and materials is discussed. The stages of development and improvement, as well as composition of the State primary measurement standard of mass fraction and mass (molar) concentration of water in liquid and solid substances and materials (GET 173) are considered. The problems of the limited applicability of GET 173 in case of separation of water with different binding energies and impossibility of conducting qualitative analysis of non-water volatile compounds during heating of substance

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Figueiredo, Mariana Pires, and Vera Regina Leopoldo Constantino. "K4Nb6O17 layered hexaniobate: revisiting the proton-exchanged reaction." Ecl�tica Qu�mica Journal 47, no. 2SI (2022): 30–36. http://dx.doi.org/10.26850/1678-4618eqj.v47.2si.2022.p30-36.

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The layered hexaniobate of K4Nb6O17 composition and its derivatives comprise nanostructured materials that exhibit suitable properties for application in catalysis, electrochemistry, and energy, for instance. The exchange of K+ cations to obtain the acidic or protonic niobate form is the main route to originate appropriate precursors to promote the hexaniobate exfoliation, yielding a dispersion of thin layers (2D particles) that can be scrolled under exclusive conditions. Hexaniobate presents two regions�(I and II), being the former considered more accessible than region II. In this work, the

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Thalmaier, G., N. Cobîrzan, A. A. Balog, et al. "Influence of sawdust particle size on fired clay brick properties." Materiales de Construcción 70, no. 338 (2020): 215. http://dx.doi.org/10.3989/mc.2020.04219.

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This study investigates the effect of adding different size fractions of the same pore forming agent (sawdust) on the material’s compressive strength and heat transfer. The samples were dry pressed and fired at high temperature inside an oven. Phase transformations were evidenced by a combination of differential thermal analysis, thermogravimetry and mass spectrometry (DTA-TGA-MS) and X-ray diffraction (XRD) techniques, in the temperature range of 24-900 ºC. Image analysis (IA) and compression tests were performed to explain the mechanical behaviour of the samples. The thermal conductivity was

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Salama, Nahla N., Mohammed A. El Ries, Safaa Toubar, Maha Abd El Hamid, and Mohammed I. Walash. "Thermoanalytical Investigation of Some Sulfone-Containing Drugs." Journal of Analytical Methods in Chemistry 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/439082.

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The thermal behavior of some sulfone-containing drugs, namely, dapsone (DDS), dimethylsulfone (MSM), and topiramate (TOP) in drug substances, and products were investigated using different thermal techniques. These include thermogravimetry (TGA), derivative thermogravimetry (DTG), differential thermal analysis (DTA), and differential scanning calorimetry (DSC). The thermogravimetric data allowed the determination of the kinetic parameters: activation energy (Ea), frequency factor (A), and reaction order (n). The thermal degradation of dapsone and topiramate was followed a first-order kinetic b

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Gajjar, Dhaval G., Rinkesh M. Patel, Hema N. Patel, and Pravinkumar M. Patel. "Designing, characterization, and thermal behavior of triazine-based dendrimers." Journal of Polymer Engineering 35, no. 1 (2015): 41–52. http://dx.doi.org/10.1515/polyeng-2014-0123.

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Abstract Different generations of dendritic architecture with piperazine in core moiety and hydroxyl groups on the periphery were designed by divergent method. 1,4-biz(4,6-trichloro-1,3,5-triazin-2-yl)piperazine was synthesized as a core for dendrimer synthesis. Dendrimer was then grown to G3 from core compound using diethanolamine and cyanuric chloride as branching units. Dendrimer generations were characterized by infrared (IR) spectroscopy [Fourier transform IR (FTIR)], 1H-nuclear magnetic resonance (NMR), 13C-NMR, electrospray ionization-mass spectrometry (ESI-MS), and elemental analysis.

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Firmino, Pollyana P., Jaqueline E. Queiroz, Lucas D. Dias, et al. "Synthesis, Molecular Structure, Thermal and Spectroscopic Analysis of a Novel Bromochalcone Derivative with Larvicidal Activity." Crystals 12, no. 4 (2022): 440. http://dx.doi.org/10.3390/cryst12040440.

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Chalcones belong to the flavonoids family and are natural compounds which show promising larvicidal property against Aedes aegypti larvae. Aiming to obtain a synthetic chalcone derivative with high larvicidal activity, herein, a bromochalcone derivative, namely (E)-3-(4-butylphenyl)-1-(4-bromophenyl)-prop-2-en-1-one (BBP), was designed, synthesized and extensively characterized by 1H- and 13C- nuclear magnetic resonance (NMR), infrared (IR), Raman spectroscopy, mass spectrometry (MS), ultraviolet–visible spectroscopy (UV-Vis), thermogravimetric analysis (TGA), differential scanning calorimetry

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Wegner, Wojciech, and Tomasz Jaroń. "Synthesis, Polymorphism and Thermal Decomposition Process of (n-C4H9)4NRE(BH4)4 for RE = Ho, Tm and Yb." Materials 14, no. 6 (2021): 1329. http://dx.doi.org/10.3390/ma14061329.

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In total, three novel organic derivatives of lanthanide borohydrides, n-But4NRE(BH4)4 (TBAREB), RE = Ho, Tm, Yb, have been prepared utilizing mechanochemical synthesis and purified via solvent extraction. Studies by single crystal and powder X-ray diffraction (SC-XRD and PXRD) revealed that they crystalize in two polymorphic forms, α- and β-TBAREB, adopting monoclinic (P21/c) and orthorhombic (Pnna) unit cells, previously found in TBAYB and TBAScB, respectively. Thermal decomposition of these compounds has been investigated using thermogravimetric analysis and differential scanning calorimetry

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Pe III, Justin Alfred, Ji Sun Mun, and Sung Phil Mun. "Thermal characterization of kraft lignin prepared from mixed hardwoods." BioResources 18, no. 1 (2022): 926–36. http://dx.doi.org/10.15376/biores.18.1.926-936.

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Thermal characterization of kraft lignin (KL) prepared from mixed hardwoods was conducted to determine their thermal and thermo-oxidative stability, glass transition temperature (Tg), pyrolysis products composition, and syringyl/guaiacyl ratio. Two milled wood lignins (MWLs) from acacia (MWL-aca) and mixed hardwoods (MWL-mhw), the same hardwood species employed in the production of KL, were also characterized for comparison with KL. Thermogravimetric analysis (TGA) indicated that KL had higher thermal and thermo-oxidative stability than MWLs. Based on differential scanning calorimetry (DSC), t

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Surahim, Mahmud, Yun Hin Taufiq-Yap, Seenivasagam Sivasangar, Abdul Rahim Nur Faizal, and Mohd Zobir Hussein. "Hydrogen Production from Rice Straw Gasification over Modified-Limestone Catalyst." Advanced Materials Research 550-553 (July 2012): 488–92. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.488.

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Malaysian limestone modified with and additions of transition metal promoters (Ni, Fe, and Co) were used for gasification of biomass. The effects of selected metal oxide loading and the addition of sodium carbonate, Na2CO3 as additive and its influence on limestone catalytic activity during gasification for hydrogen conversion were investigated. The catalysts were synthesized through deposition-precipitation (DP) method and characterized by using X-ray diffraction (XRD), Brunauer-Emmet-Teller (BET) surface area, thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). Tempera

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Bouajila, J., G. Raffin, S. Alamercery, H. Waton, C. Sanglar, and M. F. Grenier-Loustalot. "Phenolic Resins (IV). Thermal Degradation of Crosslinked Resins in Controlled Atmospheres." Polymers and Polymer Composites 11, no. 5 (2003): 345–57. http://dx.doi.org/10.1177/096739110301100501.

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The study involved the thermal degradation of phenolic resins in controlled atmospheres (inert and oxidizing). Its aim was to characterize volatile organic compounds (VOC) and inorganic compounds released during heat treatment. The methods used were thermogravimetry coupled with thermodesorption/gas chromatography/mass spectrometry (TG/TCT/GC/MS) and thermogravimetric analysis coupled with infrared (TGA/IR). At the end of the heat cycle, residues were characterized by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (solid state 13C NMR (CP/MAS)). The data show tha

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Kang, Wenyue, and Zhijun Zhang. "Selective Production of Acetic Acid via Catalytic Fast Pyrolysis of Hexoses over Potassium Salts." Catalysts 10, no. 5 (2020): 502. http://dx.doi.org/10.3390/catal10050502.

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Glucose and fructose are widely available and renewable resources. They were used to prepare acetic acid (AA) under the catalysis of potassium acetate (KAc) by thermogravimetric analysis (TGA) and pyrolysis coupled with gas chromatography and mass spectrometry (Py-GC/MS). The TGA result showed that the KAc addition lowered the glucose’s thermal decomposition temperatures (about 30 °C for initial decomposition temperature and 40 °C for maximum mass loss rate temperature), implying its promotion of glucose’s decomposition. The Py-GC/MS tests illustrated that the KAc addition significantly altere

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Bikiaris, Rizos D., Nina Maria Ainali, Evi Christodoulou, Nikolaos Nikolaidis, Dimitra A. Lambropoulou, and George Z. Papageorgiou. "Thermal Stability and Decomposition Mechanism of Poly(alkylene succinate)s." Macromol 2, no. 1 (2022): 58–77. http://dx.doi.org/10.3390/macromol2010004.

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In the present study, a series of aliphatic polyesters based on succinic acid and several diols with 2, 4, 6, 8, and 10 methylene groups, namely poly(ethylene succinate) (PESu), poly(butylene succinate) (PBSu), poly(hexylene succinate) (PHSu), poly(octylene succinate) (POSu), and poly(decylene succinate) (PDeSu), were prepared via a two-stage melt polycondensation method. All polyesters were semicrystalline materials with Tm ranging from 64.2 to 117.8 °C, while their Tg values were progressively decreasing by increasing the methylene group number in the used diols. Thermogravimetric analysis (

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