Materials Literature
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The barocaloric effect reflects a new cooling principle at low temperatures without the need of liquefied gases nor magnetic fields as used in other cooling techniques. A pressure induced structural and/or magnetic phase transition is used to obtain a significant change in the system's entropy which leads to its cooli…
Symmetric, peripherally substituted dihydroxysilicon tetrapyrazinoporphyrazines 5 and 6 were synthesized by reacting the diiminoisoindolines 1 and 2 with SiCl 4 in pyridine as solvent at considerably low temperature followed by hydrolysis of the intermediate dichlorosilicon tetrapyrazinoporphyrazines 3 and 4. In addit…
Duplex stainless steel ([DSS] UNS S31260) was investigated with the ferrite-austenite microstructure to determine the formation, growth, and redox behavior of passive films in borate buffer solution (pH = 9.3). The mechanism of growth and thickness of passive films were investigated by electrochemical impedance spectr…
The maximum densities of holes generated by cation vacancies, as well as thermoelectric parameters of (Pb 1− x Sn x ) 1− y Te y solid solutions with tin content x in the range from 0.4 to 0.6, were investigated. It is shown that each vacancy produces four holes in the valence band and that only for small x can the con…
A general model of smoothing-induced distortions of an X-ray diffraction (XRD) peak is derived from theoretical analyses by convoluting a Savitzky–Golay (S.–G.) polynomial filter with the Gaussian, Lorentzian and pseudo-Voigt curves. This is based on the assumption that an XRD peak consists of five basic parameters an…
Dissipative Particle Dynamics (DPD) is employed to model the dynamics and rheology of polymer solutions, and suspensions of spherical particles with adsorbed polymers. Static and dynamic scaling relationships for the variation of radius of gyration and relaxation time with polymer chain length are reviewed, demonstrat…
The handle and other mechanical properties of selectively bleached and unbleached fabrics knitted from fine yak hair are evaluated by means of the FAST system. Results of amino acid analysis and SEM investigations are used as a basis for discussing the reasons for handle impairment. An improved process for better hand…
Improvement of tensile mechanical properties under dynamic loading is demonstrated for two commercial magnesium alloys. Ductility in magnesium is enhanced by the addition of alloying elements. Further enhancement of ductility can be achieved by the refining grain structures for two commercial magnesium alloys. AZ3 1 a…
Abstract The acid‐catalyzed dissociation rate constants of the cerium(III) complexes of 1,4,8,11‐tetraazacyclo‐tetradecane‐1,4,8,11‐tetraacetic acid (TETA) and 1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetraacetic acid (DOTA) have been determined at four different temperatures (i.e., 25.0°C,32.0°C,39.0°C,45.0°C) in aque…
Durch Umsetzungen von Zink- und Cadmiumchlorid mit Na2[Fe(CO)4] können eine Reihe neuer (Eisencarbonyl)zink- und -cadmiumchloride synthetisiert werden, wobei der jeweilige Reaktionsverlauf stark vom verwendeten Lösungsmittel abhängt. Im Falle der Reaktion von ZnCl2 mit Na2[Fe(CO)4] werden drei verschiedene Verbindunge…
The incommensurate structure of lead cobalt tungstate has been refined by the Rietveld method on neutron data collected at 250 K. The space group is planar monoclinic 12/m(alpha0gamma)0s [a = 7.9602 (4), b = 5.6779 (3), c = 5.6967 (3) A, beta = 90.047 (5)degrees, q(inc) = 0.9000 (9)a* + 0.1735 (6)c*]. The use of powde…
The properties of filled polymers depend on the properties of the matrix and the filler, the concentration of the components, and their interactions. The effect of a nano-filler on the properties of an elastomer may be different from those of a filled glassy polymer. In this work we have compared the properties of a p…
The synthesis of polystyrene-block-poly(styrene-co-acrylonitrile) block copolymers by conversion of polystyrene terminated with 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) are described. We have found a considerable acceleration in polymerization rate and increasing of molecular weights due to the donor acceptor inte…
Abstract A novel polythiophene having an ionic viologen mesogenic side chain at the 3-position was synthesized from a 2,5-dibromo-thiophene derivative by dehalogenative polycondensation using Ni(cod)2. Redox function of the viologen moiety in the polymer was confirmed by cyclic voltammetry. The polymer showed liquid c…
The use of heat straightening to repair damaged steel structures has gained popularity in recent years. However, applications have been limited due to concerns related to degradation of material properties after repair. Most research has been limited to small undamaged plate specimens where only one to three heats wer…
ECAE process is applied to Mg-Li alloys to obtain samples with fine grain size in order to improve their tensile properties and formability. The microstructures of the ECAE samples show that the grains of specimens subjected to ECAE process only once (1-pass) are elongated towards 30 from the extrusion direction while…
Novel boron(III) subphthalocyanines 5-8 with six lipophilic alkylthio chains at the peripheral sites, bearing hydroxy or triethylsilyloxy groups in the axial position, have been synthesized and their thermotropic properties have been studied. These compounds are gelatinous materials at room temperature and gradually s…
Amphoteric graft copolymers of carboxymethylated cellulose (CMC) with 2-(dimethylamino)ethyl methacrylate (DMAEM) were prepared in aqueous solutions using ammonium persulfate (APS) and N,N,N ′,N ′-tetramethylethylenediamine (TMEDA) as the initiation system. They were characterized by the grafting parameters, IR and so…
Abstract We have performed an experimental study of the influence of varying size and charge on cation partitioning between wollastonite and silicate-carbonate melt in the system CaCO 3 -SiO 2 . The experimental conditions (3 GPa, 1420°C) lie close to the wollastonite II tc/I tc phase boundary. Results for 1+, 2+, 3+…
Deuteron quadrupole-perturbed NMR is used to study the perturbation of orientational order in a smectic-A liquid crystal (octylcyanobiphenyl or 8CB) caused by photoinduced trans-to-cis isomerization of a photosensitive dopant (diheptylazobenzene or 7AB). The time and temperature dependences of the orientational order…