Materials Literature
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We address, in a three-dimensional spatial setting, both the viscous and the standard Cahn–Hilliard equation with a nonconstant mobility coefficient. As shown in Barrett and Blowey (1999 Math. Comput. 68 487–517), one cannot expect the uniqueness of the solution to the related initial and boundary value problems. Neve…
The mixed valence Mn3+/Mn4+ and Co3+/Co4+ in manganites and cobaltites with the perovskite structure is absolutely necessary for the appearance of magnetotransport properties. It is shown that in these systems the Jahn Teller effect of the transition element, the charge and orbital ordering and the oxygen stoichiometr…
Body-centered $\mathrm{B}{\mathrm{C}}_{2}\mathrm{N}$ deduced from the unit cell of the recently predicted body-centered carbon [F. J. Ribeiro et al., Phys. Rev. B 74, 172101 (2006)] are studied with first-principles pseudopotential density functional method. The structural, electronic, and mechanical properties are in…
Designed for the general engineering student, Introduction to Engineering Materials, Second Edition focuses on materials basics and provides a solid foundation for the non-materials major to understand the properties and limitations of materials. Easy to read and understand, it teaches the beginning engineer what to l…
Metallic zinc nanoparticles (NPs) of 5-15 nm in diameter, formed in silica glass (SiO(2)) by Zn ion implantation of 60 keV, showed a strong ultraviolet absorption peak at around 4.8 eV, which has been assigned as the surface plasmon resonance (SPR) of Zn NPs, and another small peak at 1.2 eV, which has never been repo…
J. Asara et al. reported that collagen proteins from well-preserved ancient fossil bones from a 160,000- to 600,000-year-old mastodon and a 68-million-year-old T. rex can be extracted and sequenced (“Protein sequences from mastodon and Tyrannosaurus rex revealed by mass spectrometry,” 13 April,
In this study, we have investigated the influence of the hydrothermal temperature on the properties of mesoporous silica materials. Mesostructures with a well-hexagonal array of their channel are prepared if the temperature is lower than 140 °C. Increasing the hydrothermal temperature leads to the formation of wormhol…
The keto-enol (K-E) tautomerization equilibrium, more precisely, the keto-amine/enol-imine equilibrium, has been investigated for a series of substituted salicylideneanilines in view of designing compounds with a contrast of second-order nonlinear optical properties. Substituting the salicylidene ring by an acceptor g…
Highly efficient single-walled carbon nanotube (SWNT) growth from Fe−Mo nanoparticle catalysts made by colloidal synthesis is demonstrated by water-assisted chemical vapor deposition. In a 10 min growth time, SWNT forests with heights up to 1.5 mm were synthesized possessing a 2.8 nm average diameter, carbon purity ab…
Common polymers are long chain molecules based on carbon. Like metals and ceramics, a single polymer molecule may contain millions of individual atoms, all bonded together. It is not possible to determine exactly how many carbon (C) and hydrogen (H) atoms are linked together in a single molecule of polyethylene ([CH C…
The widespread use of conducting polymers in technological applications has been hindered by poor processability; strong intermolecular interactions prohibit thermal processing and reduce solubility in conventional solvents. To date, there has been a focus on the disruption of these interactions through the functional…
β-Barium borate (β-BaB 2 O 4, β-BBO) films were deposited on fused silica substrates by spin coating poly(vinyl pyrrolidone) (PVP)-modified metallo-organic solutions. Film thicknesses of more than 500 nm were obtained by a single spin-coating step followed by O 2 plasma and thermal treatments. Crack formation was effe…
Abstract Attempts have been made to investigate the effects of ethylene–propylene–diene monomer (EPDM) rubber structural parameters on the developed microstructure, mechanical properties, rheology, and oxygen gas permeability of EPDM/organically modified montmorillonite (O‐MMT) nanocomposite samples prepared via melt…
Abstract Epoxy composites based on aligned chemical vapor deposition–grown multiwall carbon nanotubes (MWCNTs), containing trapped iron nanoparticles, with weight fractions ranging from 0.03 to 1 wt%, were produced following a well‐known processing way. Electrical and mechanical properties as well as their densities w…
Abstract A series of poly(ϵ‐caprolactone) (PCL)/graphite oxide (GO) composites were synthesized through the ring‐opening polymerization of ϵ‐caprolactone with GO as an initiator. The crystallization behavior of the PCL–GO composites and the effects of the PCL–GO composites as nucleation agents on the crystallization b…
Abstract The effect of nanoparticles on nonisothermal polymer crystallization was investigated using poly(ethylene terephthalate) (PET) nanocomposites with alumina (Al 2 O 3 ) nanoparticles of average size 38 nm. The filler content in the nanocomposites was varied from 0 to 10 wt %. The interparticle spacing was obser…
Die Geschwindigkeitskonstanten der säurekatalysierten Butanoldehydratisierung an Keggin-Polyoxometallatclustern H8−nXn+W12O40 (X=P, Si, Al, Co) steigen mit zunehmendem Oxidationszustand des Zentralatoms und, damit einhergehend, abnehmender Zahl von Protonen im Cluster (siehe Diagramm). Diese Trends spiegeln die niedri…
We present a hybrid approach that combines top-down fabrication with bottom-up directed assembly for making single-walled carbon nanotube (SWNT) based three-dimensional interconnects. The SWNTs are assembled using dielectrophoresis at room temperature on a microfabricated 3D platform. The two-terminal resistance of th…
Abstract The thermoplastic starch/PVA (SP) composites are prepared by a single‐screw extruder. This article presents a study of the influence of the formulation on the hydrophilicity of SP composites. An orthogonal array and the analysis of variance (ANOVA) are employed. The results of ANOVA show that the water absorp…
Abstract Conducting polymers are excellent microwave absorbers and they show technological advantage when compared with inorganic electromagnetic absorbing materials, being light weight, easily processable, and the ability of changing the electromagnetic properties with nature and amount of dopants, synthesis conditio…