Journal of Thermal Analysis and Calorimetry

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

List of Papers (Total 568)

Advanced analysis of poly(3-hydroxybutyrate) phases based on vibrational heat capacity

The new quantitative thermal analysis of semicrystalline poly(3-hydroxybutyrate) (P3HB) phases based on vibrational, solid and liquid heat capacities has been presented. The apparent heat capacity of P3HB was measured using the standard differential scanning calorimetry, and temperature-modulated DSC and quantitative analysis allow for the study of any glass transition, ...

Phase behaviour of dehydrated phosphatidylcholines

Dehydrated DLPC, DMPC, DPPC and DSPC have been characterised at temperatures below the diacyl carbon chain-melting transition (T m), using DSC. For the first time, the existence of pre-Tm transition processes, which are, usually, only observed in the colloidal/liposomal state of saturated phospholipids, has been detected for the dehydrated phosphatidylcholines. ...

Chemical kinetics on thermal decompositions of di-tert-butyl peroxide studied by calorimetry

An overview in the field of chemical kinetics on the thermal decomposition of di-tert-butyl peroxide (DTBP) has been performed in this study. Nowadays, DTBP has been a model compound for studying thermokinetics of organic peroxide and standardization of the DSC or adiabatic calorimeter. Thermal decompositions of DTBP in neat state or solution are conducted by heat flow or adiabatic ...

Application of thermogravimetry in the assessment of coatings ability to be metallized

The main aim of this work was to assess the ability of thermogravimetric method to predetermine the surface activation properties of the coatings intended for laser-assisted electroless metallization. In this technique of metallization, surface of polymer material has to be activated before immersing in electroless metallization bath. Surface activation may consist in compositional ...

The influence of chromium substitution on crystal structure and shift of Néel transition in GdFe1−xCrxO3 mixed oxides

The gadolinium ferrochromite (GdFe1−xCrxO3) was used as a case study of influence of chromium substitution on the perovskite structure in the entire composition range. By exploiting thermal analysis techniques (dilatometry, differential thermal analysis) the influence of chromium was investigated in the context of thermal stability of the canted antiferromagnetic ordering. It was ...

Structure and properties of aluminium–magnesium casting alloys after heat treatment

Since the forming of the microstructure depends on the specific of the casting method, which directly affects further mechanical and physical properties of the material, it is important to understand how to control the microstructure of the cast to understand changes that taking place during the crystallisation process. For estimating the metallurgical quality of the liquid metal ...

Spectroscopic (IR, Raman) and thermogravimetric studies of 3d-metal cinchomeronates and dinicotinates

In this work, the thermal and spectroscopic properties of 3d-metal (Co, Cu, Zn, Mn, Ni, Fe) and sodium salts with cinchomeronic acid (3,4-pyridinedicarboxylic acid) (3,4pda) and dinicotinic acid (3,5-pyridinedicarboxylic acid) (3,5pda) were studied. The IR and Raman spectra were registered and analyzed in the range of 400–4000 cm−1. The thermogravimetric study of synthesized ...

Thermokinetic analysis of spent ion-exchange resins for the optimization of carbonization reactor condition

Radioactive spent ion-exchange resins, a combustible organic waste, cannot be readily incinerated due to the volatilization of radioactive cesium. The volatilization of metals and the thermal decomposition of organics are thermally stimulated processes. An optimum thermal treatment condition without the volatilization of cesium species but with the substantial decomposition of ...

Calorimetric study of Eu2O3–ZrO2 feedstock powders and sintered materials

The synthesis of ceramic materials based on europia–zirconia system and obtained by solid-state reaction in high-temperature vacuum press was investigated. Firstly, phase composition and calorimetric behavior of feedstock powders was investigated. The second part of the paper concerns the synthesis process of non-stoichiometric mixtures of feedstock powders prepared by four ...

Study on crystallization phenomenon and thermal stability of binary Ni–Nb amorphous alloy

In this paper, a ribbon of binary Ni–Nb amorphous alloy was prepared by the melt spinning technique. Glass transition and crystallization phenomenon of the alloy were investigated by differential scanning calorimetry. Thermal properties of the ribbon of binary Ni–Nb upon heating and cooling were analysed by DTA at a heating/cooling rate of 0.5 K s−1 under the purified argon ...

Yttria-stabilized zirconia–alumina composite sintering temperature effect on thermal diffusivity

Yttria-stabilized zirconia (YSZ) is one of the most common materials used for a ceramic top coat in the thermal barrier coating (TBC). The high operating temperature used in the gas turbine engines causes the stress between the top coat and the bond coat. The stress relaxation can be assured by modifications of YSZ. Hence, studies on how to modify the chemical and phase composition ...

Thermal diffusivity characterization of bond-coat materials used for thermal barrier coatings

Thermal barrier coatings (TBC) are the system build from ceramic insulation top-coat with internal bond-coat as an interlayer between ceramic and Ni-based superalloys substrate materials. The basic role of bond-coat is reduction of thermal strain between ceramic top-coat and metallic substrates. The second role is related to improving the oxidation resistance of metallic substrate. ...

Influence of inorganic fillers on PLA crystallinity and thermal properties

Polylactide (PLA) composites with three types of fillers, calcium carbonate, barium sulfate, and mica, have been prepared. Methods of preparation were melt mixing in a Brabender plasticorder at 190 °C and solution mixing in chloroform. The concentration of added fillers was: 0.1, 1, and 5 mass% (only by melt mixing). Thermal properties of prepared composites were investigated by ...

Thermal and mechanical properties of polyurethanes modified with L-ascorbic acid

In this study we report the thermal and mechanical properties of polyurethanes modified with ascorbic acid (AA). Ascorbic acid was used as a modifier at concentration of 1 or 2 mass%. The antioxidative properties of AA may improve the biocompatibility of the obtained materials, which were designed for biomedical applications. In this paper we describe characterization of obtained ...

Effect of cenospheric fillers on the flammability and fire hazard of silicone rubber composites

This paper presents the results of testing the flammability of silicone rubber composites containing fillers, such as cenospheres, cenospheres covered with iron, attapulgite, wollastonite, aluminum hydroxide and silica. In order to increase the insulating character of boundary layer, boron trioxide was incorporated into the composites of silicone rubber as a ceramization additive. ...

Kinetics of melamine phosphate thermal decomposition in DSC studies

This paper presents the results of study of the kinetics of two-stage condensation of melamine orthophosphate to melamine pyrophosphate and subsequently to melamine polyphosphate. The investigations were conducted under non-isothermal conditions and at constant rate of sample heating. Five different heating rates were applied: 40, 20, 10, 5, 2 K min−1. The activation energy of the ...

Wood biomass characterization by DSC or FT-IR spectroscopy

The wood biomass obtained from four tree species: spruce, beech, willow and alder was studied. Sawdust obtained by sawing of wood was dried in a convective dryer at 80 °C, without drying-agent flow. The measurements taken with oven-drying method covered determination of initial moisture and its detailed changes during entire drying process. Both DSC curves and spectral data from ...

Synthesis of Fe8V10W16O85 by a solution method

Phase of block-type structure and formula Fe8V10W16O85 has been synthesized by a solution method using Fe(NO3)3·9H2O, NH4VO3 and (NH4)6W12O39·xH2O as a metal precursors. Brown solid obtained after evaporation of water at 60 °C has been heated in air at temperatures selected based on results of measurements with the aid of differential thermal analysis and thermogravimetric analysis ...

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 ...

Influence of initial assumptions on the kinetic models of CO2 gasification of chars and cokes in solid phase

Kinetic studies of CO2 gasification of different materials were carried out using the Geneva method in an apparatus for determining the reactivity of cokes. The main purpose of these studies was parallel analysis of the Boudouard–Bell (B–B) reaction progress on the basis of both solid-phase and gaseous products combined with the mass balance of the process. The kinetic equations ...