Materials Literature
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Molecular dynamics simulations are performed for a supercooled simple liquid with changing the system size from N=108 to 10(4) to examine possible finite-size effects. Although almost no systematic deviation is detected in the static pair correlation functions, it is demonstrated that the structural alpha relaxation i…
Fluorinated amorphous carbon films have been deposited in a plasma-enhanced chemical vapor deposition system, and the optical properties examined by Fourier transform infrared and ultraviolet-visible absorption spectroscopy. The infrared absorption spectra in the region from 1000 to 1800 cm−1 were resolved into ten pe…
The use of thin (Ni/sub 0.81/Fe/sub 0.19/)/sub 1-x/Cr/sub x/ seed layer for obtaining high anisotropic magnetoresistance in Permalloy (Ni/sub 0.81/Fe/sub 0.19/) films is reported. The process yields a high /spl Delta/R/R of for example, 3.2% for 120-/spl Aring/-thick NiFe, without high-temperature deposition or anneal…
{Mn(OH2)2[Mn(bpym)(OH2) ]2[Fe(CN)6]2}∞, a two-dimensional cyanide-bridged polymer, exhibits canted ferrimagnetism with TC = 11 K.
A singular limit is considered for a system of Cahn-Hilliard equations with a degenerate mobility matrix near the deep quench limit. Via formal asymptotics, this singular limit is seen to give rise to geometric motion in which the interfaces between the various pure phases move by motion by minus the surface Laplacian…
Extensive experimental investigations at ambient temperature on commercial Nylon 66, PEI (Polyetherimide) and PEEK (poly(ether ether ketone)) have shown that the overstress model developed for viscoplasticity should be, in principle, capable of modeling for solid polymers the rate-dependent behavior, including creep,…
A model based on dilute‐solution porous‐electrode theory is proposed to describe electrochemical devices that store energy in the double layer (double‐layer capacitors). Various assumptions, such as neglecting concentration polarization, potential‐dependent capacitance, and micropore effects, are made in the model. Fo…
Oxidation of water-insoluble alcohols in supercritical CO2 over a Pd–Pt–Bi/C catalyst in a continuous fixed bed reactor affords high reaction rates and yields up to 98% of the corresponding ketones, aromatic and α,β-unsaturated aliphatic aldehydes, without the risk of using a flammable organic solvent.
Purple crystals of the compound Na2Co2(C2O4)3(H2O)21 were synthesized in high yielding hydrothermal reactions. The room temperature crystal structure reveals an anionic cobalt oxalate network with a 2-leg ladder topology. The ladder frameworks run parallel to the a axis and are held together by both hydrogen bonding a…
We determined the ability of several organoclays (octadecylammonium‐ and hexadecyltrimethylammonium‐exchanged montmorillonite) and organohydrotalcites (dodecylsulfate‐ and dodecylbenzenesulfonate‐exchanged hydrotalcite) to sorb the uncharged pesticide triadimefon [1‐(4‐chlorophenoxy)‐3,3‐dimethyl‐1‐(1 H ‐1,2,4‐triazol…
The pH dependent ligation of a pendant arylsulfonamide group allows switching between the q = 0 and q = 2 states to be reported by changes in lanthanide luminescence emission over the pH range 5.5–7.5 and in the presence of serum albumin.
MgM(III)–carbonate hydrotalcites where M(III) = Al, Fe and Cr were rapidly synthesized through an instantaneous addition method coupled with microwave irradiation. The materials were characterized by powder X-ray diffraction (XRD), thermogravimetric analysis, 27Al MAS-NMR spectroscopy, transmission electron microscopy…
The engineering of a functional blood vessel substitute has for a quarter of a century been a "holy grail" within the cardiovascular research community. Such a substitute must exhibit long term patency, and the critical issues in this area in many ways are influenced by biomechanics. One of the requirements is that it…
Talc-filled polypropylene (PP) composites coupled with silane-grafted polypropylene (PP-g-Si) were prepared. Effect of PP-g-Si on the mechanical properties, crystallization, and melting behavior of PP composites was investigated. Compared with the uncoupled composites, the mechanical properties of Talc/PP composites c…
Entitled “Natural Fiber-Based Composites”, this Special Issue has the objective to give an inventory of the latest research in the area of composites reinforced with natural fibers. Fibers of renewable origin have many advantages. They are abundant and cheap, they have a reduced impact on the environment, and they are…
The use of predisposed segmental ligands in multi-component self-assembly processes allows the preparation of triple-helical heterodimetallic d–f complexes in which each pair of metal ions is isolated and protected from external interactions. The selection of the programmed heterodimetallic edifice within the ‘dynamic…
Reaction of a tetracyano[1,1,1,1]metacyclophane blocked in the 1,3-alternate conformation and silver cations under self-assembly conditions leads to a tubular coordination network formed by double bridging of consecutive rings by linearly coordinated metal centres.
Slow diffusion of K3[Fe(CN)6] and [NiL](ClO4)2 (L = 3,10-diethyl-1,3,5,8,10,12-hexaazacyclotetradecane) yields a novel cyano-bridged 2D brick wall-like assembly which is ferromagnetically ordered below 9.1 K with considerably strong hard magnetic behaviour.
The vibrational spectra of [R3S]I3(l) (R = Me or Et) showed extra spectral features in the 145 and 170 cm−1 region, in contrast to what is predicted by the selection rules for I3− of D∞h symmetry. Depolarisation experiments showed that the 170 cm−1 peak originates from a symmetric vibration mode. The addition of an ex…
A tetrahedrally distorted mononuclear copper(II) complex, [Cu(salabza)] 1, and two dinuclear CuLn complexes, [Cu(salabza)Ln(hfac)3] (Ln = Gd 2 or Lu 3), were synthesized and their molecular structures determined, where H2salabza and Hhfac denote N,N′-bis(salicylidene)-2-aminobenzylamine and 1,1,1,5,5,5-hexafluoroacety…