Materials Literature
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Polymer dynamics in a cross-linked poly(ethylene oxide−propylene oxide) random copolymer, both neat and doped with an inorganic salt, is investigated by means of quasi-elastic neutron scattering (QENS) as a function of temperature and momentum transfer. Data from a high-resolution backscattering instrument are reporte…
An electronically-controlled metamaterial-based transmission line (TL) is demonstrated for the first time and applied to a continuous-scanning leaky-wave (LW) antenna. This transmission line is a composite right/left-handed (CRLH) microstrip structure incorporating varactor diodes for fixed-frequency voltage-controlle…
Zinc sulphide (ZnS) thin films have been prepared on Pyrex substrates by the spray pyrolysis technique using zinc chloride and thiourea as precursors. The depositions were carried out on substrates heated at 450 °C. The films were then annealed under sulphur atmosphere for one hour at 450 or 500 °C. This process allow…
Monolayer catalysts containing binary active phases (VOx-CrOx, VOx-MoOx) were prepared by simultaneous deposition of the corresponding transition metal-oxo species on the TiO2 (anatase) surface using the equilibrium deposition filtration technique. The prepared samples contained various amounts of each transition meta…
We present a simple analytical mean-field theory for the pair interaction between two colloidal particles, based upon a recent mean-field equation for the depletion thickness δ which depends on the chain length N, the bulk concentration φ b, and the solvency χ. Only in the extremely dilute case is (in mean field) the…
The effect of composition on the true mechanooptical properties of thermoplastic poly(urethane urea)s was investigated by selectively varying the type and content of soft and hard segments. Real-time stress−strain−birefringence data together with off-line wide-angle X-ray scattering measurements revealed that soft seg…
A new series of stilbene-based chromophores have been used to prepare structurally related siloxane-based monolayers in order to determine which factors control the intermolecular chromophore−chromophore interactions in the solid state. The reaction of chromophore precursors 4-styrylpyridine ( 1 ), 4-[2-(4-bromophenyl…
Using a combined rational-combinatorial approach, stable copper binding sites were implemented in template-assembled synthetic four-helix bundle proteins constructed by three different helices with only 16 amino acid residues. These peptides include two histidines and one cysteine at positions appropriate for coordina…
Abstract The protective clothing and equipment required for certain sports may inhibit heat loss from the body and contribute to potentially harmful heat stress injuries. This study measured the thermal resistance (insulation) and evaporative resistance of a variety of sports ensembles worn for football, basketball, b…
Zeolite (silicalite-1) micromembranes having only approximately 0.005 mm2 of permeation area have been prepared on laser-perforated, 75-μm-thick stainless steel sheets. Arrays of these micromembranes performed well in the gas-phase separation of a propane/N2 mixture, showing a hydrocarbon permeance at least an order o…
The (2 )⟨111⟩ twinning energy landscape of BCC Mo is determined using the density functional theory for embryos containing 2 to 7 layers. The 2-layer embryo is metastable, whereas the 3- and 4-layer ones are unstable. Layer-by-layer growth starts at 5 layers. The twin boundary formation and migration energies are foun…
Single-crystal electron nanodiffraction patterns have been obtained from nanocrystals of various phases formed within carbonaceous balls produced by chemical vapor deposition (CVD). For the face-centered cubic phase, n-diamond, with cell dimension a = 0.36 nm, the relative intensities of the (200) reflection (forbidde…
A two-dimensional periodic mushroom structure is proposed as a leaky-wave antenna with a conical beam. To the author's knowledge, this is the first 2D leaky wave antenna demonstrated experimentally. The structure can be modelled as a composite right/left-handed (CRLH) transmission line and exhibits both backward and f…
Liquid inclusions consist of pockets of saturated solution entrapped in host crystals during crystallization from solution. Inclusions are contaminants that exert deleterious effects on the properties of the host crystals. When adipic acid was crystallized from aqueous solutions by cooling, the amount of included wate…
The thermal degradation of wood treated with amino resins and amino resins modified with phosphate has been studied by differential thermal analysis (DTA) and thermogravimetry (TG) in nitrogen. From the resulting data, kinetic parameters for different stages of thermal degradation are obtained using the method of Broi…
Recent developments in hot-melt impregnation, extrusion, and thermoforming offer multiple avenues for the design and manufacture of low-cost thermoplastic composites for mass transit and automotive applications. Fiber reinforced thermoplastics such as glass/polypropylene (glass/PP) have found their applications in fro…
The sustained progress in the study of the hysteretic behavior of structural and mechanical systems has led to the adoption of increasingly sophisticated and reliable mathematical representations. Models based on the distributed elements (hysterons) appear to be quite versatile. Among these, the Preisach hysteretic mo…
Reaction of Pt(diimine)(edt) (edt = 1,2-ethanedithiolate) with M(2)(dppm)(2)(MeCN)(2)(2+) (dppm = bis(diphenylphosphino)methane) gave heterotrinuclear complexes [PtCu(2)(edt)(mu-SH)(dppm)(3)](ClO(4)) (11) and [PtCu(2)(diimine)(2)(edt)(dppm)(2)](ClO(4))(2) (diimine = 2,2'-bpyridine (bpy), 12; 4,4'-dibutyl-2,2'-bipyridi…
A via-free microstrip left-handed (LH) transmission line (TL) is proposed, which enables easy and low-cost fabrication of backward wave TLs. Based on the equivalent circuit, dispersion characteristics of the TL are theoretically obtained and the effect of the virtual short capacitance on the LH bandwidth is shown. The…
Novel protein core-shell nanocluster films were assembled layer by layer on solid surfaces. In the first step, positively charged heme protein hemoglobin (Hb) or myoglobin (Mb) and negatively charged poly(styrenesulfonate) (PSS) were alternately adsorbed on the surface of SiO2 nanoparticles, forming core-shell SiO2-(p…