Article
Materials Science, Multidisciplinary
Sergei A. Baskakov, Yuliya Baskakova, Eugene N. Kabachkov, Victor N. Vasilets, Alexandre Michtchenko, Yury M. Shulga
Summary: The composition and thermophysical properties of the composite aerogel of polytetrafluoroethylene with graphene oxide (PTFE-GO) before and after reduction with hydrazine vapour were investigated using X-ray photoelectron spectroscopy (XPS), thermogravimetry (TG), and differential scanning calorimetry (DSC). The reduction and subsequent heating at 370 degrees C, it was shown, increases the surface fluorine concentration and the thermal stability of the aerogel.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Polymer Science
Gang Liu, Shuaiyin Fang, Yong Wang, Jinjun Liu, Yangshi Liang, Tingwei Cao, Quantao Liu
Summary: Bitumen in asphalt mixture production and construction emits a large amount of VOCs, which can pose environmental and health risks. This study investigated the VOCs emitted by base and crumb rubber-modified bitumen (CRMB) binders and their composition was characterized using TD-GC-MS. Organic montmorillonite (Mt) nanoclay was added to the CRMB binder, and its inhibiting effect on VOCs emission was examined. Models for VOCs emission of CRMB and Mt-modified CRMB binders were established. The results showed that CRMB binder had 3.2 times higher VOCs emission than the base binder, and the nanoclay reduced VOCs emission by 30.6%, especially for alkanes, olefins, and aromatic hydrocarbons. The established emission model based on Fick's second law accurately described the behavior of CRMB and Mt-CRMB binders. Overall, Mt nanoclay is an effective modifier to inhibit VOCs emission from CRMB binder.
Review
Pharmacology & Pharmacy
Marek Wesolowski, Edyta Leyk
Summary: Using multiple measurement techniques ensures reliable interpretation of sample changes during heating, eliminating uncertainty and improving data interpretation. This paper briefly characterizes thermal analysis techniques coupled with spectroscopic or chromatographic techniques. Various design solutions for coupled thermogravimetry (TG) with infrared spectroscopy (FTIR), mass spectrometry (MS), and gas chromatography/mass spectrometry (GC/MS) systems are discussed. The importance of coupled techniques in pharmaceutical technology is highlighted, as they provide insights into the behavior and degradation of medicinal substances during heating, allowing determination of decomposition mechanisms and prediction of shelf life and storage conditions. In addition, design solutions for interpreting differential scanning calorimetry (DSC) curves using observation or simultaneous recording of FTIR spectra and X-ray diffractograms (XRD) are characterized, addressing the inherent non-specificity of DSC.
Article
Construction & Building Technology
Ning Tang, Jun-jie Yang, Wen-fei Cen, Wen-hao Pan, Li-mei Wu, Chang-wei Xu
Summary: The study focuses on using organic montmorillonite to enhance the adhesion between bitumen and acidic aggregate in asphalt pavement. Results show that using 5.0% OMT can significantly improve the fracture energy and peak load of bitumen, as well as enhance the coating degree of acid aggregate after boiling water test.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Yating Qin, Tongjiang Peng, Hongjuan Sun, Li Zeng, Yao Li, Can Zhou
Summary: The study suggests a negative correlation between the layer charge of montmorillonite (Q(m)) and the thermal stability of bentonite. The larger the Q(m) value, the lower the thermal stability of bentonite. Different Chinese bentonite samples from Wuhu, Xinyang, and Santai showed varying levels of Q(m) and thermal stability, with structural integrity and reusability being influenced by these factors.
CLAYS AND CLAY MINERALS
(2021)
Article
Materials Science, Ceramics
Avishak Chatterjee, Ning Liao, Tengteng Xu, Shaobai Sang, Yawei Li, Pawel Stoch, Ilona Jastrzebska, Jacek Szczerba, Mithun Nath
Summary: A new high-temperature ternary Cr(III) phase (Wuboraite, CaAl2Cr2IIIO7) was synthesized in the Al2O3-CaO-Cr2O3 system. The formation and chemical transformation mechanism of Wuboraite have not been explored in detail. Through solid-state reaction using XRD, TG-DSC, XPS, and leaching tests, the system between 500 and 1600 degrees C under air and argon atmosphere was investigated. Wuboraite formation starts at different temperatures (-1500 &-1100 degrees C) under different atmospheres (air and Ar), with intermediate compounds CaCrVIO4 and CaCr2IIIO4 playing a crucial role in wuboraite conversion.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Sheng Zhang, Fei Wang
Summary: Thermal disposal of organic hazardous wastes in a rotary kiln is effective in destroying organic pollutants, but interactions between different wastes can affect combustion performance and gas emissions. Experimental results showed positive interactions between different types of wastes, which can be beneficial for stable combustion.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Izabela Jendrzejewska, Karel Knizek, Jerzy Kubacki, Jerzy Goraus, Tomasz Goryczka, Ewa Pietrasik, Zoia Barsova, Josef Jampilek, Beata Witkowska-Kita
Summary: Chemical compounds CuCr2-xMnxSe4 (x = 0.1, 0.2) were successfully synthesized in polycrystalline and nanoparticle forms using solid state reaction and high-energy ball milling. The study investigated the influence of grain size and manganese content on the structure, magnetic, and thermal properties of the compounds. Results showed that decreasing grain size leads to a decrease in melting temperature, and the presence of Mn ions affects the stability and resistance of the doped compounds compared to pure CuCr2Se4.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Physical
Saba Shariati, Masoumeh Mousavi, Albert Hung, Elham H. Fini
Summary: It has been found that adding polyphosphoric acid (PPA) to bitumen modified with Montmorillonite clay (MMT) can decrease swelling and increase resistance to moisture, improving pavement distress. PPA was shown to preferentially adsorb onto MMT, blocking water from entering and improving the stability of the modified bitumen.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Energy & Fuels
Mohammadhasan Sasar, Cliff T. Johnston, Marika Santagata
Summary: This study investigated the characteristics of residual organics in fluid fine tailings (FFTs) generated by surface mining of oil sand ore bodies and the effects of polymeric flocculation on mineral-organic interactions. The findings revealed differences in residual organics between different bitumen extraction processes and the continued release of bitumen after polymeric flocculation.
Article
Thermodynamics
Tatsuko Hatakeyama, Suzuka Yamashita, Hyoe Hatakeyama
Summary: Lignin-based polycaprolactone (PCL) graft copolymers with various graft ratios were prepared to investigate the thermal properties of PCL influenced by lignin. The study found that as the length of the PCL chains increased, crystallization constraints were enhanced, affecting the thermal properties of the copolymers.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Construction & Building Technology
Anastasiya Y. Yadykova, Sergey O. Ilyin
Summary: The use of nanoscale particles and modifiers from renewable raw materials is a modern approach to improve material properties. This study examines the combined application of montmorillonite nanoparticles and bio-oil to enhance the properties of bitumen binder. The addition of 10% bio-oil maximizes the adhesion of bitumen to silicate surfaces without affecting its fluidity. Hydrophilic particles reduce the viscosity of bitumen and shift its solid-liquid transition point towards lower temperatures, while hydrophobic clay significantly improves the elasticity, stiffness, cohesion, and adhesion of bitumen.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Ceramics
V. G. Ilves, N. Pizurova, P. M. Korusenko, S. Yu Sokovnin, M. E. Balezin, A. S. Gerasimov, M. A. Uimin, M. G. Zuev, A. A. Vasin
Summary: Amorphous-crystalline nanoparticles of maghemite were synthesized using a radiation-chemical method. The nanoparticles had a quasi-spherical agglomerate structure with an uneven surface covered with thin, porous, randomly oriented, elongated plates. The annealing process resulted in a phase transformation from maghemite to amorphous to hematite. The hematite nanoparticles showed improved texture characteristics and could potentially be used as contrast agents in MRI.
CERAMICS INTERNATIONAL
(2023)
Article
Thermodynamics
Caroline Polini Lupi, Antonio Ap. Pupim Ferreira, Filipe Correa Guizellini, Ieda Aparecida Pastre, Hideko Yamanaka, Fernando Luis Fertonani
Summary: This study investigates the thermal and electrochemical interaction of montmorillonite clay (Mt) and a modified montmorillonite clay (Mt-M) with a peptide sequence and chlorpyrifos pesticide. The methods used include thermal analysis techniques, X-ray diffraction, scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The results show that the electrode surface coverage is higher for Mt-M compared to Mt, and the transport of the redox species is limited by the heterogeneity of the Mt and Mt-M film formed on the electrode surface.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Mining & Mineral Processing
Niroj Kumar Mohalik, Somu Mandal, Santosh Kumar Ray, Asfar Mobin Khan, Debashish Mishra, Jai Krishna Pandey
Summary: Thermogravimetric analysis and differential scanning calorimeter (TGA/DSC) technique were used to study the spontaneous combustion propensity behavior of coal samples from Indian coalfields. The results showed an increase in mass in the temperature range of 150-350 degrees C, which could be attributed to the adsorption and absorption of oxygen. Correlation and principal component analysis indicated a good correlation between the proximate analysis components and TGA experimental results. Multiple fixed nonlinear regression analysis suggested that the T-gign parameter derived from TG experiments may be the best indicator for classifying coal samples based on their susceptibility to spontaneous combustion. Hierarchical clustering analysis was used to classify the coal samples into four groups based on moisture, volatile matter, and TG ignition temperature. Field observations and statistical analysis supported this classification. (C) 2021 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
