Journal of Thermal Analysis and Calorimetry

http://link.springer.com/journal/10973

List of Papers (Total 578)

Thermal stability, crystallization and magnetic properties of Fe-Co-based metallic glasses

The aim of the paper was to investigate thermal stability, crystallization and magnetic properties of Fe-Co-based metallic glasses (MGs). Investigations were carried out on amorphous ribbons with the compositions of [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 and [(Fe0.6Co0.3Ni0.1)0.75B0.2Si 0.05]96Nb4. Thermal properties (liquidus T l and melting T m temperatures) of the pre-alloyed ingots ...

Characteristic of synthesis and transformations of hardystonite in willemite glass-crystalline glaze based on thermal analysis

A new crystalline phase hardystonite (Ca2ZnSi2O7) has been obtained in willemite glass–ceramic glaze containing more than 20 % by mass ZnO. To our knowledge, there was no report about the presence of this calcium zinc silicate in glazes. The aim of this study was to investigate the synthesis and thermal behavior of Ca2ZnSi2O7 in ceramic glaze. A hardystonite formed in glaze at 750 ...

Investigations of rheological properties of nitrided steels using thermodilatometric method with temperature modulation

In this work were developed issues concerning the use of thermodilatometric methods for the evaluation of rheological properties of nitrided and non-nitrided steel substrates and systems composed of steel substrate and physical vapour deposition (PVD) coating. Analysis of the rheological properties of these systems (e.g. viscosity, ability to dissipate the energy of deformation or ...

Thermal analysis of activated carbon obtained from residue after supercritical extraction of hops

Activated carbons have been obtained by physical activation of residue left after supercritical extraction of hops. The effect of pyrolysis temperature on the physicochemical properties of the adsorbents prepared was tested. The carbonaceous materials were characterised by low-temperature nitrogen sorption, determination of pH and the number of surface oxygen groups. The thermal ...

Characterization of composites containing NiAl2O4 spinel phase from Al2O3/NiO and Al2O3/Ni systems

This paper focused on the characterization of the composites containing nickel aluminate spinel from Al2O3/NiO and Al2O3/Ni systems. The composites were prepared by die pressing of powders and subsequent sintering of green bodies in air atmosphere. Composites were characterized by XRD, SEM, EDS and DTA/TG/MS analyses. The physical properties of the composites were measured by ...

Effect of heat treatment on the physicochemical properties of nitrogen-enriched activated carbons

A series of functionalized carbonaceous adsorbents were prepared by means of reaction with urea and chemical activation of Polish brown coal. In order to obtain nitrogen groups bonded in different ways to the carbon structure, the reaction with urea was performed at two different stages of processing, with precursor or char. Additionally, the influence of annealing under nitrogen ...

Synthesis, structural characterization and thermal studies of a novel reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol

A new thiazolylazo reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol has been synthesized via arylation of acrolein and further diazotization and diazocoupling with 2-naphthol. The chemical structure of the compound was confirmed by IR, NMR: 1H, 13C, COSY, HSQC and SALDI-MS spectral data. The DSC method was employed to determine the melting point and the enthalpy of ...

The effect of chain extender structure on the properties of new thermoplastic poly(carbonate–urethane)s derived from MDI

Two series of high-molar-mass thermoplastic poly(carbonate–urethane)s (PCURs) were synthesized from nonconventional sulfur-containing chain extenders, i.e., 2,2′-[sulfanediylbis(benzene-1,4-diyloxy)]diethanol (diol SE) and 2,2′-[methanediylbis(benzene-1,4-diylmethanediylsulfanediyl)]diethanol (diol ME), 1,1′-methanediylbis(4-isocyanatobenzene) and 30, 45 and 60 mol% aliphatic ...

Thermal properties of TEX decomposition or sublimation

TEX is a thermostable compound and less sensitive to external stimuli. It sublimates and decomposes at high temperature. The influence of DSC and TG measurement conditions and substance mass on the thermal decomposition of TEX was determined. It was observed that substance mass, pan type and fulfillment degree of pan influence the thermal decomposition and kinetic parameters of TEX ...

Thermal, spectroscopic and dissolution studies of lovastatin solid dispersions with acetylsalicylic acid

Lovastatin (LOV) is widely used for the treatment of hypercholesterolemia. The poor water solubility of LOV leads to its poor gastrointestinal absorption and results in poor bioavailability. In this study, a preparation of solid dispersions with acetylsalicylic acid (ASA) was studied to improve the dissolution rate of LOV. Solid dispersions were prepared using various mass ratios ...

Dissolution study and thermal analysis of fenofibrate–Pluronic F127 solid dispersions

Prepared solid dispersions were applied to a drug with low water solubility to improve its dissolution rate. Fenofibrate (FEN) is a Biopharmaceutical Classification System (BCS) class-II (poorly water-soluble) drug, and its bioavailability is limited by the dissolution rate. The physical state of FEN in solid dispersions with Pluronic F127 (PLU) prepared using the fusion method was ...

Investigation of key parameters influence on properties of the green pellets and lightweight ceramic proppants obtained by mechanical granulation method

Ceramic proppants are determined as material designed for hydraulic fracturing in the shale gas industry. Shale formation is fractured due to pumping the fracturing fluid including proppants into the unconventional well. Ceramic granulates set in the newly created fissures act as a prop and permit the shale gas of flowing up the well. The aim of this research was to study and ...

Thermal, spectroscopic (IR, Raman, NMR) and theoretical (DFT) studies of alkali metal complexes with pyrazinecarboxylate and 2,3-pyrazinedicarboxylate ligands

Pyrazinecarboxylic acid and its derivatives show biological properties (inter alia antimicrobial and antifungal). In the frame of this work, the salts of 2-pyrazinecarboxylic and 2,3-pyrazinedicarboxylic acids with alkali metal cations were synthesized as well as the spectroscopic (IR, Raman, NMR), theoretical [density functional theory (DFT)] and thermogravimetric studies of ...

Thermographic imaging as alternative method in allergy diagnosis

Allergen sensitization is being diagnosed by commonly available methods in clinical practice—skin prick tests (SPTs) and specific immunoglobulin E test (sIgE). Recently, a new thermographic (TH) method for the assessment of SPT was developed, and it was demonstrated that the TH measurements of forearm temperature distribution during SPT, supported by a mathematical model, offer a ...

Effect of properties of the N,N-dimethylformamide + methanol and N,N-dimethylformamide + water mixtures on the solution enthalpy of cyclic ethers in these mixtures at 298.15 K

The enthalpies of solution of cyclic ethers [1,4-dioxane, 12-crown-4 (12C4), 15-crown-5 (15C5) and 18-crown-6 (18C6)] in N,N-dimethylformamide + methanol (DMF + MeOH) mixtures have been measured at 298.15 K. On the basis of the obtained data, the effect of the acid–base and structure–energetic properties of the DMF + MeOH mixtures on the enthalpy of solution of cyclic ethers in ...

Thermal conductivity of refractory glass fibres

In the present study, the current international standards and corresponding apparatus for measuring the thermal conductivity of refractory glass fibre products have been reviewed. Refractory glass fibres are normally produced in the form of low-density needled mats. A major issue with thermal conductivity measurements of these materials is lack of reproducibility in the test ...

The influence of silicate on transformation pathways of synthetic 2-line ferrihydrite

In this study, a series of synthetic ferrihydrite samples of Si/Fe molar ratios ranging from zero to 1.5 were heated up to 1000 °C using simultaneous TG–DTA equipment. The XRD, FTIR, SEM–EDS and magnetic susceptibility measurements were carried out prior to and after heating. It has been found that silicate retards ferrihydrite transformation to hematite and affects crystallinity ...

Regeneration performance of metal–organic frameworks

The increasing attractiveness of the adsorption methods of CO2 capturing from coal power plant flue gas, which can be observed in recent years, is linked directly with the appearance and development of new, efficient CO2 adsorbents. The success of an adsorbent depends on the development of the material that, under flue gas temperature conditions, will have high sorption capacity ...

Chromium-modified zinc oxides

Zinc oxides modified with chromium were prepared by the co-precipitation method. Samples were calcined at 400 °C. Structural and surface properties of materials were studied by means of transmission electron microscopy, X-ray diffraction and low-temperature nitrogen adsorption methods. Temperature-programmed reduction methods were used for investigation of the influence of chromium ...