The influence of time on the mechanical behavior of concrete after exposure to elevated temperatures has been studied. Twenty-one self-compacting high-performance concrete mixtures with different incorporation amounts of coarse recycled concrete aggregate (RCA) and three unprocessed waste powder materials have been tested at age of 270 days for residual compressive and flexural...
We reported on the synthesis of nanosized hydroxyapatite particles by wet chemical precipitation method and the consolidation of the nanoparticles by spark plasma sintering. We studied the effect of the synthesis temperature on the particle size and phase composition of the obtained HAp. During synthesis beyond HAp, another phase supposedly nonstoichiometric HAp was also formed...
The paper contains the results of a study on a promising combustion technology known as chemical looping combustion (CLC). The main advantage of CLC is the production of a highly concentrated CO2 stream without any energy penalty for its separation, together with NOx emissions reduction. The objective of this work was to examine novel oxygen carrier (OC) materials for their...
Synthesis of optical materials, copolymers based on methyl methacrylate used as a polymer matrix, and 2,7-bis[2-(2-hydroxy-3-methacryloyloxypropoxy)]naphthalene (2,7-NAF.DM) applied as a photoluminescent dopant are presented. The purification procedure as well as the detailed information about the method of synthesis is shown. Additionally, the effect of varying concentrations of...
In this work, lanthanum orthoniobates doped with either antimony, calcium, or both have been synthesized and studied. The water uptake of the investigated materials has been analyzed by means of thermogravimetric studies. The results show the difference between the thermodynamics of hydration between the lanthanum orthoniobate system and other proton conducting ceramics. The...
A chemometrically optimized DSC interpretation was developed for the identification of compatibility/incompatibility between active pharmaceutical ingredients (APIs) and excipients in pharmaceutical preparations. The chemometric approach based on factor analysis (FA) can be used as a supplementary tool for incompatibility detection in theophylline mixtures with excipients. The FA...
The curing behaviour of the composition of a liquid-crystalline diepoxy monomer (LCEM) with the central triaromatic mesogenic group was studied using differential scanning calorimetry, conventional DSC and temperature-modulated TMDSC and nuclear magnetic resonance 1H-NMR spectroscopy. The stoichiometric amount of primary aromatic diamine, 4,4′-diaminodiphenylmethane (DDM), was...
Chitosan (Ch) is a polysaccharide mainly used in cosmetics, biotechnology and medicine owing to its biocompatibility, biodegradability and low cytotoxicity. One of the challenges is the development of mechanisms responsible for its action in biomedical applications. In this aspect, it is important to get more profound insight into the chitosan interactions with peptide drugs at...
Different thermal analysis techniques were used to study the effect of fillers and ionic liquids (ILs) on the vulcanization process, thermal and dynamic mechanical properties of acrylonitrile–butadiene elastomer (NBR). The products of the studies were composites of NBR filled with hydrotalcite, nanosized silica or carbon black. ILs such as 1-butyl-1-methylpyrrolidinium...
The main aspect of the research was developing new systems for activating sulfur vulcanization of ethylene-propylene-diene elastomer (EPDM) with greater activity than the micrometer zinc oxide that is traditionally used. Differential scanning calorimetry (DSC) was applied to study the temperature and enthalpy of EPDM vulcanization. The range of vulcanization temperatures and the...
Polyurethane elastomers (PUR) based on polypropylene glycol and 4,4′-diphenylmethane diisocyanate were prepared with various monoethylene glycol (mEG) contents. The aim of this study is to find a reliable polymer matrix for composites of improved thermal conductivity and testing fully in order to collect knowledge about its structure. Thermal conductivity was improved from 0.255...
Photo-induced polymerization of 2-hydroxyethyl methacrylate (HEMA) in the presence of various amounts of nonreactive polyhedral oligomeric silsesquioxanes (POSS) functionalized with glycidyl, fluoroalkyl or hydroxyl groups was investigated. HEMA/POSS systems were characterized before, during and after the photocuring, with the special emphasis on the photopolymerization kinetics...
A relatively unexplored goat’s milk fat and goat’s milk chocolate were investigated to enhance thermal properties of both. Differential scanning calorimetry, pressure differential scanning calorimetry and thermogravimetry were successfully used to determine polymorphic forms of goat’s milk fat, oxidative stability and the percentage composition of goat’s milk chocolate. The...
The effect of the SrO addition on the microstructure and structure of the glazes from the SiO2–Al2O3–CaO–MgO–K2O system was investigated in this study. The results were obtained by testing the ability of the frits crystallization, the stability of the crystallizing phases during the single-step fast-firing cycle depending on their chemical composition and the effect of addition...
In this paper, we produced ethylene vinyl acetate copolymer (EVA)-filled poly(lactic acid) (PLA) blends by extrusion and injection moulding. We annealed the injection-moulded specimens at 80 °C, 100 °C, 120 °C and 140 °C to produce various crystal structures in PLA. Then we investigated the cross-effect between the crystal structure of PLA and the presence of EVA on the...
The preliminary studies on thermal behavior of differently aged natural resins from Russia (Khatanga), Dominican Republic (El Valle), Colombia and Poland (Jantar) were performed. Thermal stability and behavior under elevated temperature were investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC), while the differences in the structure and composition by...
A new compound of the formula Mg3In4V6O24 belonging to the family M3A4V6O24 [where M = metal(II), A = metal(III)] was obtained by the solid-state reaction method. The compound was synthesized by heating in air a mixture of Mg3(VO4)2 and InVO4 or MgV2O6 and In2O3 or In2O3 and V2O5, with a precursor of MgO. The new compound was characterized by XRD, SEM, IR, UV–Vis and DTA–TG...
The reaction kinetic of Portland cement was characterized by heat flow calorimetry, with the experiments conducted at different, constant, curing temperatures. With these data at hand, Ulm and Coussy’s classical rate law is extended toward a variable activation energy, reflecting that several sub-reactions take place in parallel/subsequently, what, finally, gives access to an...
This paper presents the thermal properties of highly crosslinked di(methacryloyloxymethyl)naphthalene–divinylbenzene (DMN–DVB) copolymeric microspheres containing polar groups in the structure and their alkyl-bonded derivatives. C8 and C18 alkyl chains were introduced into the aromatic rings of the DMN–DVB porous copolymer by means of the Friedel–Crafts reaction. As a source of...
This paper deals with the design, synthesis, hydration mechanism and hydration products of novel Ba2+-, Cu2+- or Bi3+-doped CaO–Al2O3–ZrO2-based cementitious materials used for heavyweight concrete mixes. The results of the heating microscopy thermal analysis indicated that both Cu and Bi in a Ca7ZrAl6O18-based cement clinker can effectively reduce the sintering temperature by...
In this study, CaCl2- and MgCl2–alcohol solvates of different stoichiometric quantities of ethyl alcohol (EtOH) and methyl alcohol (MeOH) were synthesized and characterized via coupled thermogravimetric–differential scanning calorimetry, thermogravimetric–mass spectrometric evolved gas analysis (TG-MS), spectroscopic analysis (Raman) methods as well as by X-ray diffraction...
In the case of joint diseases, as a result of the process induced by the pathophysiological factors, the small articular structures that have pilled result in a qualitative and quantitative modification of the composition of the synovial fluid (SF). The analysis of this fluid offers a unique opportunity to study the joint diseases. In our study, 28 cases of acute knee joint...
During revision hip surgeries, a soft pseudo-capsule is formed around the artificial joint. The roles of the pseudo-capsule are to protect and to stabilize the joint. Based on intraoperative observation, we have found that different types of pseudo-capsules have different thickness and elasticity, compared to the primary joint capsule. The purpose of the study was to evaluate and...
The phase equilibria in the cerium(III) iodide–cesium iodide pseudobinary system were established by differential scanning calorimetry. The system is characterized by existence of three compounds: Cs3CeI6, Cs3Ce2I9 and CsCe2I7. First one, namely Cs3CeI6, melts congruently at 823 K and undergoes two phase transitions at 658 and 762 K. Second compound, Cs3CeI6, decomposes in the...