Materials Literature
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Effects of Y 2 O 3 on the temperature stability of acceptor-doped BaTiO 3 dielectrics were studied. The sample doped with 1 mol% Y 2 O 3 exhibited the highest dielectric constant. A substantial reduction in grain size was observed in the specimen with 1 mol% Y 2 O 3 (∼0.6 µm), compared with the undoped specimen (∼1.5…
The synthesis of two galactose-terminated alkanethiols with the structural formula X-OC2H5NHCO(CH2)15SH (X = 2,3,4,6-tetra-O-methyl-beta-D-Gal or beta-D-Gal) is described. Single-component and mixed self-assembled monolayers (SAMs) of the methylated and nonmethylated compounds were prepared on gold and subsequently ch…
Abstract Polypyrrole films prepared from aromatic ester solutions of tetrabutylammonium tetrafluoroborate (TBABF4), tetrabutylammonium hexafluorophosphate (TBAPF6), tetrabutylammonium trifluoromethanesulfonate (TBACF3SO3), and tetrabutylammonium perchlorate (TBAClO4) exhibited large electrochemical strain (11.2–14.0%)…
Abstract Investigations on the activation of cellulose by mixed solutions of caustic soda and urea are reported. The structural effects of those solutions on various dissolving pulps are studied by 13 C‐CP/MAS‐NMR spectroscopy. In a series of steeping lyes, the concentration of NaOH was varied in a range from 0% to 8%…
The main mechanisms of formation of a spin gap in low-dimensional metaloxide compounds are reviewed. Among the objects in which a singlet ground state is formed are dimers, alternating chains with half-integer spin, uniform chains with integer spin, spin ladders, and two-dimensional ensembles of exchange-coupled spins…
Abstract To evaluate the potential of polyester‐based ionomers as biomaterials, we have characterized them in terms of crystallization behavior, degradation, and in‐vitro cellular interactions. The polymers used are poly(butylene succinate)‐based ionomers (PBSis) with 1 to 5 mol‐% dimethyl 5‐sodium sulfoisophthalate.…
This letter reports temperature-dependent recovery of atomic force microscope tip-formed indentations in a thermoset shape memory polymer. The indentations are made at both room temperature and 69°C, and then recovered at temperatures between 40°C and 70°C. The shape recovery is more complete for higher anneal tempera…
Membrane-based synthesis, also called template synthesis, is a very general approach used to prepare arrays of nanomaterials with monodispersed geometrical features. The most commonly used porous templates are track-etched polycarbonate and porous anodic alumina membranes. Common to all these templates is the fact tha…
A hybrid approach, combining quantum theory with classical distributed-element transmission-line models, is taken to study the transport of high-frequency energy in isolated metallic carbon nanotubes (CNTs). The characteristic impedance for these transmission lines would be approximately 40 k/spl Omega/, which is unus…
Ion‐sink methods, such as resin membranes or FeO coated strips or filter papers, have been used as soil tests for plant available P. We have standardized a resin procedure and compared extractable soil P with the FeO method for 24 soils from the continental USA. Bray‐1 extractable P ranged from 0.3 to 221 mg kg −1 and…
The Structure functions based evaluation of the thermal transient measurements is now a broadly accepted way for the characterization of the time dependent behavior of the heat flow path. The usual way of generating structure functions considers one main heat flow path. By using a large mathematical tool set it genera…
The objective of this paper is to investigate the predictability of the warp breakage rate from a sizing yarn quality index using a feed-forward back-propagation network in an artificial neural network system. In order to achieve the objective, a series of trials is conducted. An eight-quality index (size add-on, abra…
Water pollution is often thought to cause accelerated corrosion of steels, particularly in harbors where levels of oxygenation of the waters may be low and where there may be industrial and shipping wastes. Harbors and coastal regions may also be prone to nutrient pollution from sewage or agricultural run-off. Offshor…
<abstract language="eng">Dynamic mechanical analysis (DMA) is widely used in materials characterization. In this work, we briefly introduce the main concepts related to this technique such as, linear and non-linear viscoelasticity, relaxation time, response of material when it is submitted to a sinusoidal or other per…
A mechanistic model was developed and applied to predict the localised corrosion of a number of alloys in a plant process stream. In order to validate the model, multi-electrode array sensors (MAS) made from type 316L stainless steel and from two Fe–Ni–Cr–Mo–W alloys, AL6XN and alloy C–276, were installed in a side lo…
Corrosion inhibition of aluminum alloy (AA)2024-T3 (UNS A92024) in sodium chloride (NaCl) solutions after pretreatments in solutions containing Ce(III), Co(II), or Mo(VI) ions are reported. The extent of Cu replating on AA2024-T3 surfaces and the reduction of the oxygen reduction reaction were utilized as key indicato…
Part II of this series reports on a theoretical model and simulation results of coupled heat and moisture transfer with phase change and mobile condensates in clothing assemblies consisting of porous fibrous battings sandwiched by inner and outer layers of a thin covering fabric. The model considers moisture movement…
Abstract The reaction of the new, bis(bidentate), potentially dinucleating ligand 4‐isobutyl‐3,5‐di(2‐pyridyl)‐4 H ‐1,2,4‐triazole (ibdpt) with M(ClO 4 ) 2 · 6H 2 O (M = Co II , Ni II or Cu II ) in a1:1 molar ratio in MeCN affords the dinuclear complexes [Co II 2 (ibdpt) 2 (MeCN) 2 (H 2 O) 2 ](ClO 4 ) 4 ( 1 ), [Ni II…
Abstract A comprehensive investigation aimed at elucidating thermodynamic and mechanical behavior of heterogeneous systems, featuring an association of solid hydrophobic matrices (micro‐ or mesoporous) and water, has been undertaken. Scanning transitiometry techniques were applied for measurements of mechanical work a…
Abstract Two unprecedented open‐framework polar compounds (C 6 NO 2 H 5 ) 2 [Ln(H 2 O) 5 (CrMo 6 H 6 O 24 )] · 0.5H 2 O [Ln = Ce ( 1 ), La ( 2 ); C 6 NO 2 H 5 = pyridine‐3‐carboxylic acid], constructed from Anderson‐type polyoxo anions and rare‐earth cations, have been synthesized for the first time and characterized…