Kinetics of water freezing from inorganic salt solution confined in mesopores
Publication date: Available online 18 October 2019Source: Thermochimica ActaAuthor(s): Marcin Koniorczyk, Dalia BednarskaAbstractIn the presented study the kinetics of pore-confined water freezing is analysed using differential scanning calorimetry. The process is investigated in mesopores of two silica gels with pore diameter equal to 6.5 nm and 11.3 nm. Based on isoconversional study of ice crystallization caused by cooling of pure water and 1%, 3% NaCl aqueous solutions, the negative value of activation energy is obtained. The observed variation of effective activation energy might be explained by the nucl...
Source: Thermochimica Acta - October 20, 2019 Category: Chemistry Source Type: research

Experimental thermodynamics, surface and transport properties of liquid Ag-Ge alloys
Publication date: Available online 12 October 2019Source: Thermochimica ActaAuthor(s): Simona Delsante, Gabriella Borzone, Rada NovakovicAbstractThe aim of this study is to correlate the thermodynamics of liquid Ag-Ge alloys with their thermophysical properties such as the surface tension, viscosity, electrical resistivity and microscopic functions. For this purpose the Quasi-Chemical Approximation (QCA) for the regular solution and Faber-Ziman theory have been applied to describe the mixing behaviour of Ag-Ge melts in terms of the energetics and structure. Concerning the Ag-Ge system, the most important is Ag-24.5Ge (in a...
Source: Thermochimica Acta - October 13, 2019 Category: Chemistry Source Type: research

Development of a reaction mechanism for liquid-phase decomposition of ammonia borane
Publication date: Available online 12 October 2019Source: Thermochimica ActaAuthor(s): Tanusree Chatterjee, Stefan T. ThynellAbstractUsing quantum mechanics (QM) calculations, a detailed reaction mechanism for liquid-phase decomposition of ammonia borane (AB) is developed. The primary objective of this study is to provide comprehensive understanding regarding the chemical kinetics involved in H2 release process during AB dehydrogenation, to explore the pathways of oligomerization leading to ring formation during the second phase of AB decomposition and to explain the experimental observations using the proposed mechanism. ...
Source: Thermochimica Acta - October 13, 2019 Category: Chemistry Source Type: research

Experimental solubility of clotrimazole and some thermodynamic aspects of dissolution in different solvents
Publication date: Available online 10 October 2019Source: Thermochimica ActaAuthor(s): Svetlana Blokhina, Angelica Sharapova, Marina Ol’khovich, German PerlovichAbstractEquilibrium solubility of clotrimazole, an important antimycotic drug, was measured between (293.15-313.15) K in four pharmaceutically relevant solvents including buffer pH 2.0, buffer pH 7.4, hexane and 1-octanol. The experimental solubility results were correlated by modified Apelblat and van’t Hoff equations. The compound melting temperature and enthalpy were determined. The activity coefficients at infinite dilution of clotrimazole in each s...
Source: Thermochimica Acta - October 11, 2019 Category: Chemistry Source Type: research

Editorial Board
Publication date: November 2019Source: Thermochimica Acta, Volume 681Author(s): (Source: Thermochimica Acta)
Source: Thermochimica Acta - October 10, 2019 Category: Chemistry Source Type: research

Step-wise transient method for analysis of thermal properties of materials Part 1. Theoretical considerations
Publication date: Available online 4 October 2019Source: Thermochimica ActaAuthor(s): P. Koniorczyk, J. Zmywaczyk, M. WielgoszAbstractThe authors’ approach to stepwise transient plane source method for measuring specific heat, thermal diffusivity and thermal conductivity of chosen materials: foams, polymers and metals has been presented. The dynamic temperature field is generated by the passage of the constant current through a plane electrical resistance made of thin nichrome foil in the form of disk sandwiched between two identical pieces of sample material. The sample material must completely cover the heater. A s...
Source: Thermochimica Acta - October 5, 2019 Category: Chemistry Source Type: research

Structural, optical and thermal properties of V-doped GaN thin films grown by MOCVD technique
Publication date: Available online 30 September 2019Source: Thermochimica ActaAuthor(s): M. Souissi, T. Ghrib, A. Al-Otaibi, I.A. Al-Nuaim, M. BouzidiAbstractV-doped GaN epitaxial thin films were grown by Metal Organic Chemical Vapor Deposition (MOCVD) on c-plane sapphire substrate. Structure, surface morphology, gap energy, thermal conductivity, and thermal diffusivity are studied. The results show that the gap energy does not change with this V-doping concentration but its thermal conductivity decreases to a factor of about 3.5 from 128 to 36 W/mK. This behavior may be associated with the structural changes that a...
Source: Thermochimica Acta - October 1, 2019 Category: Chemistry Source Type: research

Kinetics of pressurized oxy-combustion of coal chars
Publication date: Available online 28 September 2019Source: Thermochimica ActaAuthor(s): Piotr Babiński, Grzegorz Łabojko, Michalina Kotyczka-Morańska, Marek ŚciążkoAbstractA kinetic study of oxy-combustion of chars received from two Polish coals, namely lignite and hard subbituminous was conducted. The kinetics of char oxy-combustion was examined in the TA Instruments TG-HP150 s pressurized thermogravimetric analyzer at 0.1, 0.5 and 1 MPa of absolute pressure. The experiments were carried out at isothermal conditions and at wide range of temperature (773–1273 K). Mixture of gas containing ...
Source: Thermochimica Acta - September 29, 2019 Category: Chemistry Source Type: research

Determination of heat capacity of pure metals, compounds and alloys by analytical and numerical methods
Publication date: Available online 29 September 2019Source: Thermochimica ActaAuthor(s): I.L. Ferreira, J.A. de Castro, A. GarciaAbstractPhase diagrams are normally calculated from a combination of physical equations and experimental parameters. Gibbs free energy of mixing; thermodynamics activity and enthalpy of mixing; transformation temperatures and the concentration range of the alloys components are calculated to permit an alloy system database to be constructed. The molar specific heat capacity (cv) is normally obtained by numerical derivative of the enthalpy equation with respect to temperature and concentration. Th...
Source: Thermochimica Acta - September 29, 2019 Category: Chemistry Source Type: research

Investigation on the kinetics and thermodynamics of Polyacrylonitrile-b-Poly(hydroxyethyl acrylate) via Organotellurium-mediated living radical polymerization by micro-calorimeter
Publication date: Available online 27 September 2019Source: Thermochimica ActaAuthor(s): Shijie Zhang, Jiaoqiang Zhang, Huimin Shi, Zhenguo Gao, Kaichang KouAbstractThe polyacrylonitrile-b-poly(hydroxyethyl acrylate) (PAN-b-PHEA) was synthesized of polyacrylonitrile-TeMe (PAN-TeMe) and 2-Hydroxyethyl acrylate (HEA) via organotellurium-mediated living radical polymerization (TERP), and the PAN-TeMe and PAN-b-PHEA were characterized by several methods. A Calvet micro-calorimeter was used to investigate the polymerization of PAN-TeMe and HEA at different temperatures (358.15 K, 363.15 K, 368.15 K, 373.15 K, 378.15 K and 383.1...
Source: Thermochimica Acta - September 28, 2019 Category: Chemistry Source Type: research

Thermodynamics and Kinetics of the Fenton Reaction in Foods
Publication date: Available online 26 September 2019Source: Thermochimica ActaAuthor(s): S.M. Kamrul Hasan, Matteo Scampicchio, Giovanna Ferrentino, Mosibo Ornella Kongi, Lee D. HansenAbstractA major cause of food oxidation is free-radical generation via the Fenton reaction. Calorimetric measurement of heat rate during the reaction between food antioxidants and H2O2 with added Fe(II), the catalyst in the Fenton reaction, is used to ascertain the reactions occurring and evaluate stoichiometric, thermodynamic and kinetic parameters for the reactions at 25 °C. The reaction of ascorbic acid with H2O2 at varying pH a...
Source: Thermochimica Acta - September 27, 2019 Category: Chemistry Source Type: research

Heterogeneous reaction kinetics for oxidation and combustion of boron
Publication date: Available online 25 September 2019Source: Thermochimica ActaAuthor(s): Kerri-Lee Chintersingh, Yalun Sun, Mirko Schoenitz, Edward L. DreizinAbstractNon-isothermal thermogravimetric (TG) analysis was used to study the oxidation kinetics for 95% pure amorphous boron powder. Commercial boron powders were pre-treated with acetonitrile and water to reduce the thickness of their initial hydrated oxide layer and to achieve a narrower particle size distribution. The samples were oxidized at different heating rates in an oxygen-argon gas mixture. Boron particles comprising aggregates of finer primary particles wer...
Source: Thermochimica Acta - September 26, 2019 Category: Chemistry Source Type: research

Erratum to “Kinetic analysis of sinter-crystallization of mullite and cristobalite from kaolinite” [Thermochim. Acta 678 (2019) 178312]
Publication date: December 2019Source: Thermochimica Acta, Volume 682Author(s): Tomáš Ondro, Omar Al-Shantir, Štefan Csáki, František Lukáč, Anton Trník (Source: Thermochimica Acta)
Source: Thermochimica Acta - September 26, 2019 Category: Chemistry Source Type: research

Investigation of not fully stable fluids by the method of controlled pulse heating. 4. Evaluation of PMMA thermophysical properties up to 673 K
Publication date: Available online 23 September 2019Source: Thermochimica ActaAuthor(s): Aleksandr A. Starostin, Kirill V. Luk’yanov, Aleksandr A. Smotritskiy, Pavel V. SkripovAbstractIt has been shown that it is possible, in principle, to evaluate a set of the thermophysical properties of a polymer using a single high-power heating pulse over a wide temperature range including the region of states superheated with respect to the temperature of thermal decomposition onset in a quasi-static process. The corresponding research tool consists of the experimental method of controlled pulse heating of a fast-response wire ...
Source: Thermochimica Acta - September 24, 2019 Category: Chemistry Source Type: research

Kinetics study and Hirshfeld surface analysis for atorvastatin calcium trihydrate and furosemide system
Publication date: Available online 20 September 2019Source: Thermochimica ActaAuthor(s): Maria Betânia de Freitas Marques, Bárbara Caroline Rodrigues de Araujo, Rita de Cassia de Oliveira Sebastião, Wagner da Nova Mussel, Maria Irene YoshidaAbstractAtorvastatin calcium trihydrate (ATV) is used for the treatment of hyperlipidemias. The prescribed drug may be associated with an adjuvant diuretic compound such as furosemide (FUR), to treat cardiovascular disorders. This work presents the pharmaceutical development of ATV and FUR mixtures by FTIR, XRPD, and thermal analysis in a long-term study. DSC results...
Source: Thermochimica Acta - September 21, 2019 Category: Chemistry Source Type: research

Examining the effect of starch and hydroxyapatite crosslinking on the thermal properties of polyurethane-based biomaterials
Publication date: Available online 19 September 2019Source: Thermochimica ActaAuthor(s): Klaudia Ordon, Monika Szlachta, Piotr Szatkowski, Kinga PielichowskaAbstractNew polyurethane-based materials (PUs) have been fabricated via a two-step bulk polymerization method with starch as a crosslinker, and 1,4-butanediol as a chain extender. Hydroxyapatite (HAp) was used as a bioactive compound. The structure, morphology and thermal properties of the PUs were investigated. The chemical structure of the obtained materials was confirmed by FTIR. The SEM-EDX analysis confirmed the incorporation of starch and HAp into the PU matrix. ...
Source: Thermochimica Acta - September 21, 2019 Category: Chemistry Source Type: research

Isothermal Vapor-liquid Equilibrium of Binary and Ternary Systems of Anisole, Hexane, and Toluene and Ternary System of Methyl Tert-butyl Ether, Hexane, and Toluene
Publication date: Available online 18 September 2019Source: Thermochimica ActaAuthor(s): Farideh Sadeghi Karkevandi, Ali Bakhtyari, Mohammad Reza Rahimpour, Peyman KeshavarzAbstractFollowing the importance of equilibrium data of biomass components as well as octane boosters, the isothermal vapor-liquid behaviors of binary and ternary systems including hexane, toluene, and anisole, and ternary system of methyl tert-butyl ether, hexane, and toluene were investigated at 313.2 K. To do so, the Othmer still was employed to collect the experimental data. Furthermore, thermodynamic calculations were implemented by the Peng...
Source: Thermochimica Acta - September 19, 2019 Category: Chemistry Source Type: research

Combined Studies for the Determination of the Composition and the Firing Temperature of Ancient and Contemporary Ceramic Artefacts
Publication date: Available online 17 September 2019Source: Thermochimica ActaAuthor(s): T. Kazakou, T. Zorba, G. Vourlias, E. Pavlidou, K. ChrissafisAbstractThe subject of the present work is the presentation of an integrated approach to ceramic artefacts characterization with the use of various physical-chemical techniques, in order to determine their main components and manufacturing conditions (firing temperature and atmosphere). Ceramics are very complicated regarding their mineralogical composition. Moreover, they undergo physical and chemical alterations during firing, which depend on their original composition, and...
Source: Thermochimica Acta - September 18, 2019 Category: Chemistry Source Type: research

Kinetic modeling using temperature as an on-line measurement: Application to the hydrolysis of acetic anhydride, a revisited kinetic model
Publication date: Available online 17 September 2019Source: Thermochimica ActaAuthor(s): Elizabeth Antonia Garcia-Hernandez, Camilla Ribeiro Souza, Lamiae Vernières-Hassimi, Sébastien LeveneurAbstractThe use of calorimeter in chemical reaction engineering is a powerful tool to estimate kinetic constants. Indeed, reaction temperature is used as an online analytical signal. Nevertheless, the thermal characterization of the calorimeter must be done to avoid wrong estimation. The hydrolysis of acetic anhydride was used as a reaction model in a handmade calorimeter, because it is a fast and exothermic reaction. Se...
Source: Thermochimica Acta - September 18, 2019 Category: Chemistry Source Type: research

Simultaneous access to the low-frequency dynamics and ultraslow kinetics of the thermal expansion behavior of polyurethanes
This article demonstrates how low-frequency dynamics and ultraslow kinetics of thermal expansion of polymers are easily measured by the spectroscopic dilatometry technique called “Temperature Modulated Optical Refractometry”. The influence of molecular packing and dynamics is investigated on the kinetic and dynamic glass transition of three visco-elastic polyurethane networks of different crosslink density. A major observation is the potentially massive difference between kinetic and dynamic thermal expansion coefficients for the vitrifying polyurethane networks at a given temperature. The same holds true for t...
Source: Thermochimica Acta - September 18, 2019 Category: Chemistry Source Type: research

Thermodynamic properties of Nalidixic and Oxolinic acids: Experimental and computational study
Publication date: Available online 16 September 2019Source: Thermochimica ActaAuthor(s): Alex N. Manin, Alexander P. Voronin, Ksenia V. Drozd, German L. PerlovichAbstractThe thermophysical characteristics of nalidixic (NLD) and oxolinic (OXL) acids have been determined by DSC. The fusion processes of the studied compounds have been analyzed by mass-spectrometry. The transpiration method has been used to measure the vapor pressures as a function of NLD temperature. Based on these results, the standard molar enthalpy, entropy and Gibbs energy of sublimation at T =298.15 K have been calculated. A comparative study of t...
Source: Thermochimica Acta - September 18, 2019 Category: Chemistry Source Type: research

Fast-Scan and Temperature-Modulated Calorimetry of Recrystallization of Poly(ethylene terephthalate)
Publication date: Available online 14 September 2019Source: Thermochimica ActaAuthor(s): Akihiko TodaAbstractThe recrystallization behavior of poly(ethylene terephthalate), PET, in the melting region was examined by Fast-Scan and Temperature-Modulated Calorimetry. In addition to the prior results of Fast-Scan Calorimetry, FSC, evidence that recrystallization caused double PET melting peaks was obtained. An exothermic recrystallization peak was directly observed in the second heating run of FSC after the lower-temperature melting peak was eliminated through rapid heating and cooling. FSC was then performed with a temperatur...
Source: Thermochimica Acta - September 16, 2019 Category: Chemistry Source Type: research

The excess molar volume and the molar surface Gibbs energy of the binary of the ether-functionalized ionic liquids [C22O1IM][TfO] with ethanol and isomeric propanols at T = (288.15–318.15) K
Publication date: Available online 13 September 2019Source: Thermochimica ActaAuthor(s): Da-Wei Fang, Xiao-Hong Hu, Kun-Hao Liang, Qiang Yan, Jie WeiAbstractThe density and surface tension for the binary mixtures of ionic liquid (ILs) [C22O1IM][TfO] with ethanol, 1-propanol and 2-propanol are measured across the entire range of mole fraction at T = (288.15–318.15) K. The excess molar volumes of the binary mixtures are calculated, the relationship between VE and the mole fraction and temperature are explored. Especially, the term, △VE/△T is proposed to describe the interaction between the solvent and solute quanti...
Source: Thermochimica Acta - September 15, 2019 Category: Chemistry Source Type: research

The stability and thermophysical properties of a thermal fluid containing surface-functionalized nanoencapsulated PCM
In this study, the stability and thermophysical properties of a latent functionally thermal fluid (LFTF) composed of water and surface-functionalized nanoencapsulated phase change material (NEPCM) were experimentally investigated. The NEPCM was produced by the encapsulation of n-nonadecane with poly(styrene-co-methacrylic acid) P(St-co-MAA) shell by using mini-emulsion polymerization method. The NEPCM was characterized using fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermogravimetry (TG-DTG) techniques. The LFTFs were prepared by dispers...
Source: Thermochimica Acta - September 15, 2019 Category: Chemistry Source Type: research

Heat transfer characteristics and drying kinetics of hematite thin layer during hot air convection
Publication date: Available online 12 September 2019Source: Thermochimica ActaAuthor(s): B.A. Fu, M.Q. Chen, Q.H. LiAbstractHeat transfer characteristics and drying kinetics of the hematite thin layer during hot air convection based on a lab-scale setup were examined at seven temperatures (100, 110, 120, 130, 140, 150, and 160 °C). Four periods during the drying process were detected, a warm-up period, a constant rate period, the first and second falling rate periods. Two isothermal temperature stages were noted during the hot air drying. The average heat transfer coefficients of the whole drying process increas...
Source: Thermochimica Acta - September 12, 2019 Category: Chemistry Source Type: research

Alkaline Earth Metal Salts of 3,6-Dinitramino-1,2,4,5-tetrazine: Prospective Candidates for Environmentally Friendly Energetic Applications
Publication date: Available online 5 September 2019Source: Thermochimica ActaAuthor(s): Jie Ren, Tianhe Zhang, Zhimin Li, Lin Wang, Tonglai ZhangAbstractFour alkaline earth metal salts (Mg2+(1), Ca2+(2), Sr2+(3), Ba2+(4)) of 3,6-dinitramino-1,2,4,5-tetrazine were synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Structural analysis revealed that all compounds have differently reticular structures, where each metal is bound in a specific and characteristic fashion. Thermal behaviors investigated by differential scanning calorimetry (DSC) and thermogravimetric analysi...
Source: Thermochimica Acta - September 6, 2019 Category: Chemistry Source Type: research

Synthesis and Thermal Decomposition of TNPG
Publication date: Available online 5 September 2019Source: Thermochimica ActaAuthor(s): Wen-qian Wu, Wei Feng, Qiu-han Lin, Shun-yao Wang, Zi-chao Guo, Li-ping Chen, Wang-hua ChenAbstract1, 3, 5-Trihydroxy-2, 4, 6-trinitrobenzene (TNPG) is an essential energetic intermediate for synthesis of 1, 3, 5-Triamino-2, 4, 6-Trinitrobenzene (TATB). The thermal stability of TNPG was studied in this work. First, TNPG was synthesized by nitration of 1, 3, 5-trihydroxybenzene with the solution feeding. Then, the thermal stability of TNPG was studied by DSC and ARC experiments. The non-isothermal DSC results indicated that the thermal d...
Source: Thermochimica Acta - September 6, 2019 Category: Chemistry Source Type: research

Influence of Temperature Rising Inhibitor on nucleation and growth process during cement hydration
Publication date: Available online 5 September 2019Source: Thermochimica ActaAuthor(s): Zhang Hao, Liu Xin, Feng Pan, Li Lei, Wang WenbingAbstractTemperature rising inhibitor is usually used in mass concrete to reduce the thermal cracking risk during the early hydration. The influence of TRI on nucleation and growth kinetics during cement hydration has been investigated by isothermal calorimetry analysis and boundary nucleation-growth theory. Experimental and simulated results showed that TRI decreased the growth rate preferentially and have little influence on the nucleation process. As comparison groups, synthesized C-S-...
Source: Thermochimica Acta - September 6, 2019 Category: Chemistry Source Type: research

Quantification of detergent-dispersant additives in gasoline by thermogravimetry
In this study, a quantification method is proposed that only uses thermogravimetry, preceded merely by the pre-concentration of the additives by standard atmospheric distillation. The distillation residues from seven samples of gasoline additized with additive A at nominal concentrations from 100 to 5000 mg.kg-1 were analyzed, as were regular gasoline (without additive – blank), pure additives, and 15 samples of additized gasoline acquired at filling stations. By calculating the additive concentration ratio from the atmospheric distillation process and the mass loss relating to the main active components of th...
Source: Thermochimica Acta - September 5, 2019 Category: Chemistry Source Type: research

Investigation of thermal characteristics of municipal solid waste incineration fly ash under various atmospheres: A TG-FTIR study
This study provides insights for further thermal treatment of fly ash.Graphical abstract (Source: Thermochimica Acta)
Source: Thermochimica Acta - September 5, 2019 Category: Chemistry Source Type: research

Hydration kinetics of tricalcium silicate with the presence of portlandite and calcium silicate hydrate
Publication date: Available online 3 September 2019Source: Thermochimica ActaAuthor(s): Liming Huang, Zhenghong YangAbstractThis work was designed to investigate the hydration kinetics of C3S with portlandite and calcium silicate hydrate (C-S-H). The hydration heat, T2 relaxation time and XRD of hydration products were determined to evaluate the hydration performance. C-S-H and CH presents distinct influence on the early hydration of C3S. C-S-H facilitates early hydration of C3S, reduces the induction period and increases the hydration rate at 10 or 20 °C, but CH prolongs the induction period. Up to 30 and 40 °C, t...
Source: Thermochimica Acta - September 4, 2019 Category: Chemistry Source Type: research

Kinetic mechanism of Magnesium Production by Silicothermy in Argon Flowing
Publication date: Available online 3 September 2019Source: Thermochimica ActaAuthor(s): Yusi Che, Zhenhua Hao, Jinpeng Zhu, zhenhua Fu, Jilin He, Jianxun SongAbstractThe experiment of magnesium production was carried out by non-isothermal thermogravimetric analysis (TGA) technique under the conditions, where the reaction equilibrium was shifted by entraining the magnesium vapor into argon. The thermogravimetric (TG) of pellets made of calcined dolomite, ferrosilicon and fluorite were determined at the heating rate of 10, 15 20 and 25 ℃ min−1 in argon flowing and high temperature, respectively. Then on the basis of ...
Source: Thermochimica Acta - September 4, 2019 Category: Chemistry Source Type: research

Determination of standard molar enthalpies of formation of Bi2Mo3O12 (s), Bi2MoO6 (s), Bi6Mo2O15 (s) and Bi6MoO12 (s) by solution calorimetry
Publication date: Available online 3 September 2019Source: Thermochimica ActaAuthor(s): P.M. Aiswarya, S. Shyam Kumar, Rajesh Ganesan, T. GnanasekaranAbstractThe standard molar enthalpies of formation of Bi2Mo3O12 (s), orthorhombic phase of Bi2MoO6 (s), monoclinic phase of Bi2MoO6 (s), Bi6Mo2O15 (s) and Bi6MoO12 (s) were determined by solution calorimetry and the values obtained are (-2915.8 ± 8.2), (-1407.2 ± 7.1), (-1385.7 ± 7.3), (-3346.5 ± 21.7) and (-2605.2 ± 20.3) kJ mol-1, respectively. The given uncertainties we...
Source: Thermochimica Acta - September 4, 2019 Category: Chemistry Source Type: research

Study of the thermal behavior in oxidative and pyrolysis conditions of some transition metals complexes with Lornoxicam as ligand using the techniques: TG-DSC, DSC, HSM and EGA (TG-FTIR and HSM-MS)
Publication date: Available online 3 September 2019Source: Thermochimica ActaAuthor(s): Geórgia A.C. Zangaro, Ana C.S. Carvalho, Bruno Ekawa, André L.C.S. do Nascimento, Wilhan D.G. Nunes, Richard P. Fernandes, Gareth M.B. Parkes, Gage P. Ashton, Massao Ionashiro, Flávio J. CairesAbstractLornoxicam metal complexes [M(Lor)2(OH2)2]∙nH2O, where M represents the bivalent transition metals (Mn(II) to Zn(II)), Lor is Lornoxicam ligand and n = 2.0 or 2.5 were synthesized. The compounds were characterized by elemental analysis (EA), powder X-ray diffraction (PXRD), infrared spectroscopy (FTIR),...
Source: Thermochimica Acta - September 4, 2019 Category: Chemistry Source Type: research

Editorial Board
Publication date: October 2019Source: Thermochimica Acta, Volume 680Author(s): (Source: Thermochimica Acta)
Source: Thermochimica Acta - August 31, 2019 Category: Chemistry Source Type: research

Intelligent assessment of effect of aggregation on thermal conductivity of nanofluids—Comparison by experimental data and empirical correlations
Publication date: November 2019Source: Thermochimica Acta, Volume 681Author(s): Aboozar Khalifeh, Behzad VaferiAbstractImproving the performance of energy-based systems is a key factor for potential applications of nanofluids. Nanoparticle aggregation is a complicate phenomenon that changes thermal conductivity of nanofluids and their heat transfer performances. There’s available no accurate correlation for accounting effects of aggregation on thermal conductivity of nanofluids over wide ranges of operating conditions. Therefore, we focus on designing accurate artificial intelligence (AI) approaches for prediction th...
Source: Thermochimica Acta - August 29, 2019 Category: Chemistry Source Type: research

Experimental Investigations on the Thermal Properties of Jalore Granitic Rocks for Nuclear Waste Repository
Publication date: Available online 26 August 2019Source: Thermochimica ActaAuthor(s): P.K. Gautam, A.K. Verma, T.N. Singh, Wei Hu, K.H. SinghAbstractIn this paper, the thermal properties of Jalore granitic rocks were determined using the transient plane source (TPS) technique in the temperature range from 25 °C to 250 °C. The dilatometric tests for thermal expansion and the thermal strain were carried out. The results obtained indicate that the thermal conductivity, thermal diffusivity, mass loss and elastic wave velocity of Jalore granite decreases gradually as the temperature increases from 25&thins...
Source: Thermochimica Acta - August 28, 2019 Category: Chemistry Source Type: research

Preparation And Characterization Of Encapsulated Phase Change Materials In Presence Of Gamma Alumina For Thermal Energy Storage Applications
Publication date: Available online 26 August 2019Source: Thermochimica ActaAuthor(s): Hatice Hande Mert, Mehmet Selçuk MertAbstractModified gamma alumina/fatty acids composite phase change materials (PCMs) were prepared via encapsulation with poly(St-co-DVB) shell by phase inversion emulsification method. The gamma alumina (γ-Al2O3) nanoparticles were modified by cetyl trimethylammonium bromide (CTAB). The modified gamma alumina (M-γ-Al2O3) was added into fatty acid mixture, which composed of oleic acid (OA) and capric acid (CA) besides to n-hexadecane. Thus, the effect of alumina addition on the morphol...
Source: Thermochimica Acta - August 26, 2019 Category: Chemistry Source Type: research

Thermal behavior of inosine 5′-monophosphate complexes with cobalt(II), nickel(II), copper(II) and cadmium(II) cations
Publication date: October 2019Source: Thermochimica Acta, Volume 680Author(s): J.H.F. de Jesus, M.S. Souza, J.A. Ellena, E.T.G. CavalheiroAbstractInteraction of nucleotides and metals has been largely studied since they have biological importance. Divalent complexes of inosine 5'-monophosphate with cobalt(II) (IMP-Co), nickel(II) (IMP-Ni), copper(II) (IMP-Cu) and cadmium(II) (IMP-Cd) have been characterized by elemental analysis and submitted to thermogravimetry (TG), differential thermal analysis (DTA), differential scanning calorimetry (DSC) and thermogravimetry coupled to infrared spectroscopy (TG-FTIR). Cadmium(II) com...
Source: Thermochimica Acta - August 25, 2019 Category: Chemistry Source Type: research

Intelligent assessment of effect of aggregation on thermal conductivity of nanofluids – comparison by experimental data and empirical correlations
Publication date: Available online 23 August 2019Source: Thermochimica ActaAuthor(s): Aboozar Khalifeh, Behzad VaferiAbstractImproving the performance of energy-based systems is a key factor for potential applications of nanofluids. Nanoparticle aggregation is a complicate phenomenon that changes thermal conductivity of nanofluids and their heat transfer performances. There’s available no accurate correlation for accounting effects of aggregation on thermal conductivity of nanofluids over wide ranges of operating conditions. Therefore, we focus on designing accurate artificial intelligence (AI) approaches for predict...
Source: Thermochimica Acta - August 25, 2019 Category: Chemistry Source Type: research

Lornoxicam drug—A new study of thermal degradation under oxidative and pyrolysis conditions using the thermoanalytical techniques, DRX and LC-MS/MS
Publication date: October 2019Source: Thermochimica Acta, Volume 680Author(s): A.C.S. Carvalho, G.A.C. Zangaro, R.P. Fernandes, B. Ekawa, A.L.C.S. Nascimento, B.F. Silva, G.P. Ashton, G.M.B. Parkes, M. Ionashiro, F.J. CairesAbstractIn the present work, the thermal behavior of Lornoxicam drug was studied under oxidizing (air) and pyrolysis (N2) atmospheres using simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), differential scanning calorimetry (DSC), Hot Stage Microscopy (HSM) and Evolved Gas Analysis (EGA) in the form of thermogravimetry coupled to infrared spectroscopy (TG-FTIR) and mass spect...
Source: Thermochimica Acta - August 23, 2019 Category: Chemistry Source Type: research

Effect of isophorone diamine on curing kinetics and mechanical properties of 2-ethyl-4-methylimidazole/epoxy resin crosslinked network
In this study, diglycidyl ether of bisphenol A (DGEBA) was cured with 2-ethyl-4-methylimidazole (2E4MI) as the main curing agent, and allyl glycidyl ether (AGE) was added to improve the processability. Based on this curing system, the effect of isophorone diamine (IPD) content on curing kinetics and mechanical properties was studied to obtain the optimal fast curing resin formulation. Both the curing kinetics and the glass transition temperature (Tg) were characterized by non-isothermal DSC, and the impact, flexural, and tensile behaviours of the cured products were tested. The gel and curing time of the curing system were...
Source: Thermochimica Acta - August 22, 2019 Category: Chemistry Source Type: research

Thermal behavior of inosine 5’-monophosphate complexes with cobalt(ii), nickel(ii), copper(ii) and cadmium(ii) cations
Publication date: Available online 17 August 2019Source: Thermochimica ActaAuthor(s): J.H.F. de Jesus, M.S. Souza, J.A. Ellena, E.T.G. CavalheiroABSTRACTInteraction of nucleotides and metals has been largely studied since they have biological importance. Divalent complexes with cobalt(II) (IMP-Co), nickel(II) (IMP-Ni), copper(II) (IMP-Cu) and cadmium(II) (IMP-Cd) with inosine 5′-monophosphate have been characterized by elemental analysis and submitted to thermogravimetry (TG), differential thermal analysis (DTA), differential scanning calorimetry (DSC) and thermogravimetry coupled to infrared spectroscopy (TG-FTIR). ...
Source: Thermochimica Acta - August 19, 2019 Category: Chemistry Source Type: research

The Enhancement of Dropwise and Spray Evaporative Cooling by using Extract of Reetha added Water as a Coolant
Publication date: Available online 17 August 2019Source: Thermochimica ActaAuthor(s): Anita Panda, A. Kumar, Basudeb Munshi, S.S. MohapatraAbstractAlthough the use of synthetic surfactant in various quenching process significantly enhances the heat removal rate, the corrosive nature of the synthetic surfactants and their interaction with the metal surface during cooling does not allow to use. The replacement of the synthetic surfactant by another surfactant which is free from the abovementioned disadvantages can mitigate the requirement of various industries dealing with high heat flux applications. In this regard, the lit...
Source: Thermochimica Acta - August 19, 2019 Category: Chemistry Source Type: research

Experimental investigation and thermodynamic description of the Fe−Nd−Pr system
Publication date: Available online 16 August 2019Source: Thermochimica ActaAuthor(s): Taili Chen, Cuiping Guo, Changrong Li, Zhenmin DuAbstractThe microstructures, crystal constitutions and phase transformation temperatures of the Fe−Nd−Pr alloys were examined by the scanning electron microscopy equipped with energy dispersive spectrometer, X-Ray diffraction and differential thermal analyzer, respectively. The liquidus surface projection, the isothermal sections at 873 and 673 K, and the partial isothermal section at 933 K within 0∼40 at.% Pr and 0∼80 at.% Fe of the Fe−Nd−Pr system were cons...
Source: Thermochimica Acta - August 17, 2019 Category: Chemistry Source Type: research

Cocrystals of ciprofloxacin with nicotinic and isonicotinic acids: mechanochemical synthesis, characterization, thermal and solubility study
This article describes the synthesis and characterization of new cocrystals of ciprofloxacin with nicotinic and isonicotinic acids as coformers. The cocrystals were obtained by a mechanochemical method (neat and liquid-assisted grinding). The characterization of the cocrystals was carried out using differential scanning calorimetry (DSC), thermogravimetry and simultaneous differential thermal analysis (TG-DTA), infrared spectroscopy (IR), and powder X-ray diffraction (PXRD). Using these thermal, spectroscopic and diffractometric methods it was possible to verify the formation of the cocrystals, either with or without the a...
Source: Thermochimica Acta - August 16, 2019 Category: Chemistry Source Type: research

Thermochemical two-step water splitting cycle using perovskite oxides based on LaSrMnO3 redox system for solar H2 production
Publication date: Available online 13 August 2019Source: Thermochimica ActaAuthor(s): Nobuyuki Gokon, Kazuki Hara, Yuta Sugiyama, Selvan Bellan, Tatsuya Kodama, Cho Hyun-seokAbstractA thermochemical two-step water-splitting cycle using perovskite oxides based on LaSrMnAlO3 was examined for hydrogen production from water using concentrated solar radiation. Concurrent Sr and Mn substitutions in La1-xSrxMnxAl1-xO3, Sr and Al substitutions in La1-ySryMn1-yAlyO3, and substitution of Al by Cr in La0.7Sr0.3Mn1-zCrzO3 were examined, and their kinetics, oxygen/hydrogen productivity, and repeatability were compared against LaSrMnAlO...
Source: Thermochimica Acta - August 14, 2019 Category: Chemistry Source Type: research

Step-wise transient method for analysis of thermal properties of materials Part 2. Experimental investigations
Publication date: Available online 13 August 2019Source: Thermochimica ActaAuthor(s): P. Koniorczyk, J. Zmywaczyk, M. WielgoszAbstractThe subject of the paper which is a continuation of part 1 are issues related to the implementation of the stepwise transient plane source method. Both the measuring device and the testing methodology were developed. Measurements of thermophysical properties k, a and cp of selected materials from the group of thermal insulating foams (polyurethanes, polystyrenes), organic glass polymers and metals, including high thermal conductivity ones, i.e. duralumin at one measurement, were carried out....
Source: Thermochimica Acta - August 14, 2019 Category: Chemistry Source Type: research

Apparent thermodynamic analysis and the dissolution behavior of levamisole hydrochloride in three binary solvent mixtures
Publication date: Available online 13 August 2019Source: Thermochimica ActaAuthor(s): Pengshuai Zhang, Jiao Sha, Yameng Wan, Chi Zhang, Tao Li, Baozeng RenAbstractThe solubility of levamisole hydrochloride (LH) in binary {methanol (MT) + ethanol (EA), methanol (MT) + 2-propanol (IPA)} solvent mixtures from 283.15 K to 323.15 K and dimethyl sulfoxide (DMSO) + ethanol (EA) from 293.15 K to 333.15 K were obtained under the pressure of 0.1MPa by using a dynamic method. Moreover, the experimental solubility results of LH in this work were correlated well with five thermodynamic models namely “Yaws model, van’t Hoff ...
Source: Thermochimica Acta - August 14, 2019 Category: Chemistry Source Type: research

Barium calcium titanate solid solution: Non-isothermal kinetic analysis of Ca2+ incorporation into BaTiO3
Publication date: Available online 13 August 2019Source: Thermochimica ActaAuthor(s): Ahmed Taibi, Salem Chaguetmi, Ali Louaer, Abdelheq Layachi, Hamid SathaAbstractThis paper investigates the non-isothermal kinetic analysis of Ca2+ incorporation into BaTiO3 in Ba0.85Ca0.15TiO3 (BCT15) lead-free ferroelectric material, prepared via the solid-state reaction method, using differential scanning calorimetry (DSC) technique at multiple heating rates. The X-ray diffraction technique (XRD) has demonstrated the formation of pure cubic BaTiO3 phase when the BCT15 precursors were calcined at 1000 °C. Incorporation kinetic...
Source: Thermochimica Acta - August 14, 2019 Category: Chemistry Source Type: research