Journal of Thermal Analysis and Calorimetry

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

List of Papers (Total 568)

Compatibility studies of hydrocortisone with excipients using thermogravimetric analysis supported by multivariate statistical analysis

Application of thermogravimetry (TG) alone to study compatibility/incompatibility of active pharmaceutical ingredients (APIs) with excipients yields to misleading results due to overlapping of the thermal stages in the course of decomposition of both ingredients and their pharmaceutical mixtures. Hence, the purpose of this study was to assess the usefulness of multivariate ...

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 ...

Characteristics of thermal behavior of photoluminescent copolymers studied by the TG/DTG/FTIR coupled method

Thermal properties of the photoluminescent copolymers, naphthalene-2,7-diol dimethacrylate derivatives, are presented in this paper. The materials were synthesized by bulk copolymerization of 2,7-(2-hydroxy-3-methacryloyloxypropoxy)naphthalene (2,7-NAF.DM) with four popular vinyl monomers: 2-hydroxyethyl methacrylate (HEMA), butyl acrylate (BA), divinylbenzene (DVB) and styrene ...

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 ...

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 ...

The properties of ethylene–propylene elastomers obtained with the use of a new cross-linking substance

In this work, the effect of a new filler on cross-linking of ethylene–propylene rubber (EPM) was investigated. A filler with a core–shell structure ZnO/SiO2 (precipitated silica modified with zinc oxide) was introduced into rubber compounds. It was proved using of those substance to cross-link EPM caused the formation of labile ionic clusters in elastomer network. These ...

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 ...

Water thermoporosimetry as a tool of characterization of the textural parameters of mesoporous materials

Water thermoporosimetry (TPM) is a powerful method for studying the properties of porous materials, devoted especially for investigation of the samples that can be destroyed in drying process. However, this method is not very popular and relatively rarely used because of problems with proper measurement procedure and choosing correct equation for the result interpretation. This ...

Nucleation ability of advanced functional silica/lignin hybrid fillers in polypropylene composites

Novel advanced functional silica/lignin hybrid fillers were synthesized for the purpose of their application in composites with polypropylene. The use of lignin for the production of hybrid fillers is justified due to the advantages such as reduction in cost of products, improvement in biodegradability as well as antioxidant and antimicrobial properties. The study encompasses an ...

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 ...

Spectroscopic, thermogravimetric and biological studies of Na(I), Ni(II) and Zn(II) complexes of quercetin

The Na(I), Zn(II) and Ni(II) complexes with quercetin have been synthesized. The composition of these compounds was established by means of elemental and thermogravimetric analyses. To study the molecular structure of synthesized compounds, many miscellaneous analytical methods, which complement one another, were used: infrared (FT-IR), Raman (FT-Raman) and electronic absorption ...

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 ...

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 ...

DSC coupled with PCA as a tool for butter authenticity assessment

The authenticity assessment of butter is still a big challenge for analytics. Due to its low cost, palm oil (PO) is the edible fat most frequently used as an adulterant in the production of butter. The aim of this study was to test the feasibility of the DSC technique coupled with principal component analysis (PCA) for the distinction of pure butterfat from adulterated. A ...

Size-controllable synthesis of lithium niobate nanocrystals using modified Pechini polymeric precursor method

Nanopowders of lithium niobate (LiNbO3, LN) were synthesized by a water-based modified Pechini method, in which Li2CO3 and ammonium niobate (v) oxalate hydrate (C4H4NNbO9·xH2O) are used as the Li and Nb source materials, respectively. The kinetics of formation of the intermediate gelatinous precursor was studied by thermal gravimetry and differential scanning calorimetry. The LN ...

Application of thermal analysis methods for damage assessment of leather in an old military coat belonging to the History Museum of Braşov—Romania

The aim of this work has been the assessment of the thermo-oxidative, hydrothermal and crystalline zone stabilities of several leather samples taken by the conservators from a military coat dated sixteenth–seventeenth centuries, belonging to the History Museum of Braşov—Romania. For this purpose, the thermo-gravimetry/derivative thermo-gravimetry (TG/DTG), differential scanning ...

Buffer contribution to formation enthalpy of copper(II)–bicine complex determined by isothermal titration calorimetry method

The isothermal titration calorimetry (ITC) technique supported by potentiometric titration data was used to study a buffer contribution to the formation enthalpy of copper(II)–bicine complex obtained directly from the ITC experiments. The calorimetric measurements were carried out at 298.15 K in 100 mM buffer solutions with a pH of 6. In experiments two biologically relevant pH ...

Starch-g-poly(benzyl methacrylate) copolymers

The physicochemical properties such as swelling in polar and non-polar solvents, moisture resistance, chemical resistance, ability for gelatinization and the thermal properties along with the evolution of volatile decomposition products of some starch-g-copolymers obtained through the grafting of benzyl methacrylate monomer onto potato starch have been studied. The chemical ...

Application of hot-stage microscopy to evaluating sample morphology changes on heating

Investigations of the thermal properties of a raw material or a ceramic product under a hot-stage microscope allow, among others, determining the characteristic temperatures corresponding to the changes of the shape and the cross-section area of samples being heated. They are based on observing and analysing images of the sample recorded with the growth of its temperature. The ...