Materials Literature
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We review both the theoretical electromagnetic response and the spectroscopic measurements of metamaterials. To critically examine published results for metamaterial structures operating in the range from terahertz to optical frequencies, we focus on protocols allowing one to extract the optical constants from experim…
Abstract The layered double hydroxides‐supported diisopropylamide (LDH‐DA) catalyst is found to be an efficient and selective solid base for aldol, Knoevenagel, Henry, Michael, transesterification and epoxidation reactions under liquid phase conditions. LDH‐DA is synthesized by the interaction of lithium diisopropylam…
In this article we present an enthalpy-based simulation for the evolution of equiaxial dendrites, growing in an undercooled melt of a pure substance. The enthalpy formulation, which is used extensively for macroscale modeling of solidification, is modified appropriately by combining relevant macroscale and microscale…
A mechanism is proposed for ammonia transport across a cellulose acetate membrane. The transport is shown to have a sorption character, with the formation of hydrogen bonds between ammonia molecules and the polymer. Our experiments demonstrate that the membrane can be regenerated in the course of gas separation. The i…
SrAl 2 O 4 :Eu 2+ phosphor crystals co‐doped with auxiliary activators such as La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or Y have been grown by the floating zone (FZ) technique. Photoluminescence spectrum (PL), time‐resolved PL, and thermally stimulated luminescence (TSL) are evaluated to clarify the long‐d…
Methods for the manufacture of rugate filters by the ion-beam-sputtering process are presented. The first approach gives an example of a digitized version of a continuous-layer notch filter. This method allows the comparison of the basic theory of interference coatings containing thin layers with practical results. Fo…
Edible and/or biodegradable films usually have limited water vapor barriers, making it difficult to use them. Thus, the objective of this work was to evaluate the effect of a chemical reticulation treatment with formaldehyde and glyoxal on the mechanical properties, water vapor permeability, solubility and color param…
We demonstrate that a modified point diffraction interferometer can be used to measure the power distribution of different kinds of ophthalmic lenses such as spectacles, rigid and soft contact lenses, progressive lenses, etc. The relationship between the shape of the fringes and the power characteristics of the compon…
Abstract Summary: Several solvents were utilized to investigate their influence on the formation of honeycomb patterns. The polymers PPO, PLGA and PLLGA were dissolved in different solvents or mixed solvents to form porous membranes. It was found that a good compatibility between the polymers and their solvents, and a…
Vielversprechende metallhaltige Gele: Molekulare Gele bilden eine Klasse von Nanomaterialien, die durch Selbstorganisation niedermolekularer Verbindungen entstehen. Die Einführung von Metall-Ligand-Wechselwirkungen bietet neue Möglichkeiten, gut bearbeitbare und “intelligente” Gele herzustellen, die aus den Eigenschaf…
Abstract Real time synchrotron Small‐Angle and Wide‐Angle X‐ray Scattering was performed during the tensile deformation of a high‐density polyethylene copolymer. The changes of the structure in the crystalline and in the amorphous domains were followed during the three characteristic stages of the load‐displacement cu…
Activated sludge from different full-scale wastewater treatment plants (municipal, pulp and paper industry, starch manufacturing and cheese manufacturing wastewaters) was used as a source of microorganisms to produce biodegradable plastics in shake flask experiments. Acetate, glucose and different wastewaters were use…
Indium-doped ZnO (IZO) films with low In content (<6 at. %) were fabricated by rf helicon magnetron sputtering. The uniformity of the composites was confirmed by elemental analysis. The formation of an In–Zn–O solid solution was verified using X-ray diffraction (XRD) patterns. A wide, high-transmittance region (400–20…
Poly(ethylene oxide)−polyacrylonitrile (PEO- b -PAN) diblock copolymers were synthesized and used as supramolecular templates for mesoporous silicas and precursors for mesoporous carbons. The copolymers were prepared from poly(ethylene oxide) homopolymers through chain extension with polyacrylonitrile (PAN) via atom t…
The hole story: Highly ordered anodic porous alumina with a hole interval of 13 nm was fabricated (see SEM image). The ordered structure of a 2D array of monodisperse γ-Fe2O3 nanoparticles was transferred to Al through the deposition of Al by sputtering. The formed shallow concaves on the Al surface could act as initi…
Some novel concepts of designing antireflection (AR) coatings with equivalent layers are presented. As an introduction, essential papers concerning thin-film optics and AR designs are cited, and the AR problem and a previously introduced AR-hard design type are discussed. Based on the known matrix formalism, a potenti…
A new polar hexaborate, K3[B6O10]Br (space group R3m), is synthesized under hydrothermal conditions. The radical anion is composed of macallisterite hexaborate blocks 6[3Δ + 3T] formed by boron triangles and boron tetrahedra. The blocks are joined together through vertices into a [B6O10] ∞∞∞ 2− zeolite-like framework…
To apply the knowledge of reaction mechanisms of heterogeneously catalyzed reactions on the atomic scale to supported catalyst systems, a detailed description of the structure of active particles on the atomic scale is required. In this article, a method is developed to construct atomic-scale geometric models for supp…
Abstract In this paper, the transmission properties of left‐handed microstrip lines implemented by etching complementary split rings resonators (CSRRs) and capacitive gaps in the ground plane and conductor strip, respectively, are investigated. To this end, we make use of the lumped element equivalent circuit model of…
To develop a microfocused x-ray source, field emission properties of a bundle of multiwalled carbon nanotubes were investigated under an ordinary vacuum pressure of 5×10−7Torr for a practical use. Total emission current reached up to 1.3mA at an applied voltage of −7kV. An emitted electron beam was focused on a Cu ano…