Materials Literature
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A metamaterial layer comprising of a conducting square mesh surrounding subwavelength holes has a largely pure imaginary effective refractive index. We explore the microwave transmissivity of a stack of such metamaterial layers separated by dielectric spacers. As expected, a family of high transmissivity bands is expe…
The synthesis and structural characterization of three heterometallic rings templated about imidazolium cations is reported. The compounds are [2,4-DiMe-ImidH][Cr(7)Ni(II)F(8)(O(2)CtBu)(16)] 1 (2,4-DiMe-ImidH=the cation of 2,4-dimethylimidazole), [ImidH](2)[Cr(6)Ni(II) (2)F(8)(O(2)CCtBu)(16)] 2 (ImidH=the cation of im…
Abstract Expandable polystyrene (EPS) particle foams were prepared in three major steps to investigate their mechanical, thermal, and fire behavior on their degree of fusion. Bending strength was found to increase progressively, whereas compressive stress was found to increase linearly with the degree of fusion of EPS…
Abstract Chitosan (CS) bicomponent nanofibers with an average diameter controlled from 100 to 50 nm were successfully prepared by electrospinning of CS and poly(vinyl alcohol) (PVA) blend solution. Finer fibers and more efficient fiber formations were observed with increased PVA contents. On this contribution, a unifo…
Abstract A naturally occurring fabric belonging to the species Hardwikia binata was extracted from the sheath of stem, bark, and branches of the tree. The fabric specimens were treated with sodium hydroxide and poly (vinyl alcohol). The morphology of the fabric specimens before and after NaOH treatment was studied usi…
Abstract Results of Pressure‐Volume‐Temperature measurement on Poly(methyl methacrylate) : Lead Titanate, PMMA : PbTiO 3 , composite system in the pressure and temperature range 0–200 MPa and 300–473 K, respectively, are presented. The thermal expansion coefficient in PMMA : PbTiO 3 composite is expected to be quite c…
We propose an efficient method to achromatically transform a circularly polarized beam to a radially polarized beam in the visible range using segmented subwavelength metal wire gratings. We present a theoretical analysis of the relationship between the polarization purity of the transmitted beams and the number of se…
The effects of boron doping and boron grafts on the mechanical behaviour of armchair (6, 6) and zigzag (10, 0) single-walled carbon nanotubes (SWCNTs) under axial loading are investigated using the molecular dynamics (MD) simulation method. The results show that Young's moduli, the tension strength, the buckling loads…
Abstract The stereosequence of polylactide has been analyzed with 13 C‐NMR spectroscopy, according to which syndiotactic addition is preferred. According to Markovian statistics, the reactivity ratio, which determines the extent of the syndiotactic stereosequence in the polymer chain, can be calculated by an analysis…
Abstract Fly ashes are the waste product following the combustion of coal. Disposal of fly ashes is a serious environmental problem; therefore, finding a new utilization of fly ashes is highly demanded. Carbon nano‐structures have been widely studied as key materials in a wide range of applications, including sensing,…
The morphology of polycrystalline chemical vapor deposited (CVD) diamond films following the interaction with hyperthermal (∼5 eV) atomic oxygen (AO) was studied by atomic force microscopy. Selective etching of the (111) diamond facets occurred, while the (100) facets showed high endurance. The observed phenomenon is…
Just say NO: The catalytic activity of Cu/zeolites for NO removal depends on the metal cation coordination to the framework. The most active catalysts are those with CuI loosely coordinated to the framework. The catalytic cycle is investigated using a periodic DFT model to account for the effect of the zeolite on the…
This paper presents a micropulse calorimeter for heat capacity measurement of thin films. Optimization of the structure and data processing methods of the microcalorimeter improved the thermal isolation and temperature uniformity and reduced the heat capacity measurement errors. Heat capacities of copper thin films wi…
Hoodia gordonii which contains the perceived active molecule, P57, is a plant used in many weight loss products that are highly susceptible to adulteration due to increased public demand and limited availability. Rapid and simple methods for authentication and confirmation of the presence of P57 are desirable for the…
The interface and bulk magnetic properties of epitaxial thin films of the Heusler compounds Co2Cr0.6Fe0.4Al/Mg/AlOx and CoCr2Al/Mg/AlOx are investigated. We compare the magnetization measured by x-ray magnetic circular dichroism experiments in surface sensitive total electron yield mode (information depth of 2–3 nm) a…
It is shown that the temperature effect on the variance of local shear stresses is the main factor pre-determining the temperature law of the yield stress of nano-sized crystals. The results of molecular dynamics simulations of uniaxial tension of Mo, α-Fe and W nanowires in three crystallographic directions ([100], […
Properties of new fluorescent, mesogenic compounds bearing [2]benzothiophene moiety are presented. Materials show strong fluorescence of green or red light with quantum yield up to 30%, in liquid crystalline phases the emitted light is strongly polarized. For material forming ferroelectric liquid crystal or doped into…
A tight-binding model for ${e}_{\text{g}}$ electrons coupled to Jahn-Teller lattice distortions is studied via Monte Carlo simulations. By focusing on the periodicity of the cooperative Jahn-Teller distortions, and the one-particle spectral function, our results clarify the physical origin of the Fermi-arcs phase obse…
Ordered nanoporous templates and membranes with controllable thickness, interpore spacing, and pore diameter are fabricated using a combination of nanosphere lithography and aluminum anodization. These nanostructured materials possess a geometry (see scanning electron microscopy image) that is well suited for a variet…
Substituted calix[4]azulenes were prepared by reacting 6-alkylazulenes with paraformaldehyde in the presence of florisil. Hydride abstraction of a calix[4]azulene with Ph(3)CPF(6) afforded a tetraazulene analogue of the porphodimethenes.