Materials Literature
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Abstract Thermoplastic polyurethanes (TPU) are an important class of elastomers that found many novel and specialized applications where high mechanical and chemical performances are prerequisites. They are known for their good mechanical strength, wear and tear resistance, and low-temperature elasticity. The aim of t…
Kurzfassung Aus Schäden bei der Verarbeitung und dem Betrieb von Warmarbeitswerkzeugen können Maßnahmen gegen frühzeitigen Ausfall abgeleitet werden. Bei der bekannten thermischen Ermüdung durchläuft die Rissfortschrittsgeschwindigkeit ein Maximum und im Maximum der Radialspannung entstehen unter der Oberfläche Querri…
Abstract Tool steels are prepared for metallographic examination in the same way as carbon steels with a few variations owing to hardness and alloying differences. This article explains what makes tool steels different and how to compensate for it when sectioning, mounting, grinding, polishing, and etching. It provide…
Zn-Al layered double hydroxides (LDHs) intercalated by terephthalate (TPH) and biphenyl-4,4'-dicarboxylate (BPH) anions have been synthesized by direct co-precipitation from aqueous solution. The Zn/Al ratio in the final materials was 1.8. The products were characterized by powder X-ray diffraction, thermogravimetric…
Abstract In this study glass has been used as a starting material in order to increase the resolution of the experiment and establish the kinetics of analcimes during hydrothermal synthesis. The experimental results show that the crystal growth curves represent two‐stage linear growth. The first stage is marked by rap…
Glass fiber used in filtration applications is typically produced by either of three types of processes: (1) continuous draw, (2) centrifugal (rotary) spinning, or (3) flame attenuation. Each process imparts to the fiber a unique set of characteristics such as diameter, length, and surface chemistry and structure. The…
This paper deals with the derivation of a macroscopic model for columnar dendritic solidification of binary mixtures using the volume averaging method with closure. The main originalities of the model are first related to the explicit description of evolving heterogeneities of the dendritic structures and their conseq…
Abstract Moisture (55 wt%) treated silica compounds, bis(triethoxysilylpropyl)disulfide(TESPD)/silica/carbon black/S-SBR was processed in a batch mixer and they were investigated with respect to the alcohol residue level in silane, the processability, the vulcanization characteristics, and the mechanical properties. T…
Abstract Linear and nonlinear oscillatory and extensional flow was studied for polymer layered silicate nanocomposites of organically modified bentonite in ethylene-vinyl acetate copolymer with 18 wt.% of vinyl acetate (EVA18). It was found that the rheological properties of EVA18 nanocomposites were distinctly differ…
Calorimetric and dielectric experiments are presented near the recently proposed Lifshitz point in order to study the nature and properties of the newly suggested phase transitions in the electric-field-temperature (E-T) phase diagram. It was found that both calorimetric and dielectric results obtained across the rece…
Objetivo: Avaliar a ação do dimetil-sulfóxido (DMSO) na necrose distal de retalhos randômicos isquêmicos em ratos. Métodos: Foram utilizados 30 ratos machos, linhagem Wistar, peso entre 220 e 363g e idade média de 3 meses. O retalho cutâneo dorsal (8x2cm) com pedículo cranial foi descolado, reposto em seu leito e sutu…
Abstract The new monoclinic oxide borates Na 2 RE 2 (BO 3 ) 2 O (RE = Dy, Ho) were synthesized using standard solid-state reactions in the temperature range 900 - 950 ◦ C. They are isotypic to the known phases Na 2 RE 2 (BO 3 ) 2 O (RE = Y, La, Nd, Sm-Gd, Er). The single crystal X-ray structure determination of Na 2 D…
Niobian rutile (Ti 4+ 0.63 Nb 5+ 0.14 Fe 2+ 0.11 Ta 5+ 0.08 Fe 3+ 0.02 W 6+ 0.01 Sn 4+ 0.003)� 0.99 O2 from the Greenbushes granitic pegmatite, Western Australia, contains lamellae (~5 � 50 � m in size) of disordered ferrocolumbite (Fe 2+ 0.80 Mn 2+ 0.12 Ti 4+ 0.07)� 0.99 (Nb 5+ 1.48 Ta 5+ 0.28 Ti 4+ 0.13 W 6+ 0.09 Sn…
The morphology and order-to-disorder transition (ODT) of solutions of a low molecular weight poly(styrene- b -ethylene- alt -propylene) in squalane were studied by four different methods: DSC, modulated DSC, rheology, and small-angle X-ray scattering (SAXS). The ordering from disordered micelles to the BCC morphology…
The dielectric barrier corona discharge (DBCD) in a wire-cylinder configuration and the dielectric barrier discharge (DBD) in a coaxial cylinder configuration are studied. The discharge current in DBD has a higher pulse amplitude than in DBCD. The dissipated power and the gas-gap voltage are calculated by analyzing th…
Ca1-xLa xTiO3 powders were prepared by the polymeric precursor method. X-ray diffraction (XRD), FT-Raman spectroscopy, transmission electron microscopy (TEM), and N2 and CO2 adsorption were used for the microstructural and surface characterization of the powders. Room temperature photoluminescence (PL) was observed in…
Este trabalho teve por finalidade analisar algumas características de misturas de solo, cimento e cinzas de bagaço de cana-de-açúcar para sua possível utilização na fabricação de materiais alternativos de construção. Para tal, amostras de cinzas de bagaço de cana-de-açúcar foram submetidas a um tratamento prévio que c…
The development of X-ray photoelectron spectroscopy (ESCA, XPS) is reviewed from an historical perspective that is relevant to its use for analytical chemistry. The emphasis is on early development of the technique, primarily during the period, 1964–1977. During these years there were significant developments in instr…
Plasma sprayed metal end connections of metallized film capacitors are the weak link for pulse power applications which involve discharge times of tens of microseconds and less. This problem will only get worse with increased capacitor energy density. The present contribution quantifies the relationship between the "q…
A framework is presented for understanding charging processes in low vacuum scanning electron microscopy. We consider the effects of electric fields generated above and below the specimen surface and their effects on various processes taking place in the system. These processes include the formation of an ionic space…