Materials Literature
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Abstract Highly porous zirconia with defined particle morphology can be prepared by impregnation of spherical activated carbon as an exotemplate with a zirconia nanoparticle sol. The resulting zirconia spheres show a particle size distribution between 0.2 and 0.4 mm and exhibit high specific surface areas and specific…
The first approach towards the automatic layout generation of resonant-type metamaterial transmission lines by using space mapping optimisation is reported. Specifically, the so-called aggressive space mapping (ASM) technique is applied for synthesising microstrip lines loaded with complementary split ring resonators…
This study presents a design of n-bit phase shifters inspired by the composite right/left-handed transmission line (CRLH TL) unit cells. The phase shifters designed have the advantages of small size, high power-handling capability, low insertion loss, arbitrary phase-shift range and arbitrary step size. PIN diodes mou…
The title compound, also called CLT acid, is an industrial intermediate in the synthesis of laked red azo pigments for newspaper printing. Solid-state NMR and IR experiments revealed the compound to exist as the zwitterionic tautomer in the solid state. The crystal structure was solved from X-ray powder diffraction da…
A silicone resin with silphenylene units in Si—O—Si backbones was prepared through hydrolysis-polycondensation of self-synthesized 1,4-bis(diethoxymethylsilyl)benzene (BDSB) and other alkoxysilanes. The structure and properties of this novel silicone resin were characterized by gel permeation chromatography (GPC), Fou…
We report on the existence of monoclinic ( M B ), orthohombic ( O ), and rhombohedral ( R ) phases in [101]‐oriented 74Pb(Mg 1/3 Nb 2/3 )O 3 –26PbTiO 3 (PMN–26PT) single crystals under electric loadings. Before electric loadings, the [101]‐oriented PMN–26PT single crystal is composed of R and monoclinic phases. Both M…
Abstract The chiral cyclic triphosphazenes ( R )‐(–)‐[N 3 P 3 (O 2 C 20 H 12 )(O 2 C 12 H 8 )Cl 2 ] ( I ) and ( R , R )‐(–) [N 3 P 3 (O 2 C 20 H 12 ) 2 (O 2 C 12 H 8 )] ( II ), prepared by sequential substitution of [N 3 P 3 Cl 6 ] using ( R )‐2,2′‐dihydroxy‐1,1′‐binaphthyl, 2,2′‐dihydroxy‐1,1′‐biphenyl and Cs 2 CO 3…
A design procedure is presented for synthesising artificial transmission lines (metamaterial lines) that exhibit four alternating backward (left-handed) and forward (right-handed) bands. Specifically, analytic expressions are given that directly yield the loading lumped elements needed for synthesising a desired Bloch…
Single-walled carbon nanotubes substitutionally doped with the light-element phosphorus are synthesized and are investigated by electrical and nuclear magnetic resonance measurements. Decreased spin-lattice relaxation times compared to undoped tubes point toward enhanced spin-sensitive scattering. Temperature dependen…
The Debye function was used to simulate the X-ray powder diffraction patterns from loose-packed systems of nanocrystals. The resulting patterns contain local atomic lattice information in the wide-angle region as well as long range, inter-particle structure features in the small-angle region. Both monodisperse and pol…
Präzisionsarbeit: Ein einfaches, einstufiges Polyolverfahren ermöglicht die Synthese von monodispersen, einkristallinen Au-Cu-Dimetallnanowürfeln. Durch Feinjustierung der Reaktionsparameter lassen sich die Dimensionen der Nanowürfel (zwei Beispiele mit 23 und 5 nm sind gezeigt) ebenso einstellen wie ihre Gold- und Ku…
The quantum sieving effect of D(2) over H(2) is examined at 40 and 77 K by means of experiments and GCMC simulations, for two types of single-wall carbon nanotubes that are distinguishable by their unique entangled structures; (1) a well-bundled SWCNT and (2) loosely-assembled SWCNT produced by the super growth method…
Entropically driven ring-opening copolymerization of mixtures of a fraction of cyclic oligo(hexamethylene terephthalate)s composed of cycle sizes from 2 to 5 and p-dioxanone was used to prepare random copolyesters covering a range of aromatic (HT) to aliphatic (DO) units ratios from 9 to 1.3. The composition and micro…
The recent discovery of magnetism in a variety of diverse non-magnetic materials containing defects has challenged conventional thinking about the microscopic origin of magnetism in general. Especially intriguing is the complete absence of d electrons that are traditionally associated with magnetism. By a systematic m…
A novel method for catalyst preparation using combustion synthesis techniques has been used to prepare Cu/Zn/Zr and Pd-based catalysts for oxidative reforming of methanol. Spatially resolved infrared thermography has been used to follow the temperature−time movement of the combustion front on cellulose paper impregnat…
Currently, many smart materials exhibit one or multifunctional capabilities that are being effectively exploited in various engineering applications, but these are only a hint of what is possible. Newer classes of smart materials are beginning to display the capacity for self-repair, self-diagnosis, self-multiplicatio…
The cobalt(III) complexes of 1,1,5,5-tetramethyl- and 1,1,5,5-tetraethyl-2,4-dithiobiuret and the cobalt(II) complex of 1,1,5,5-tetra- iso -propyl-2-thiobiuret have been synthesized. The single-crystal X-ray structure of the thiocyanide ( 1 ) and cobalt tetrachlorate ( 2 ) salts of the parent cyclized ligand, together…
Hyperbranched polythiophenes were synthesized by potentiodynamic electropolymerization of 2,2';3',2''-terthiophene and 5'-(2-thienyl)-2,2';3',2''-terthiophene. The molecular architecture, i.e., the extent of branching of the resulting polymers, could be adjusted by varying the switching potentials. We compare these sy…
The mechanism of doping carbon nanotubes (CNTs) with a salt solution was investigated using the density functional theory. We propose that the anion-CNT complex is a key component in doping CNTs. Although the cations play an important role in ionizing CNTs as an intermediate precursor, the ionized CNTs are neutralized…
The structure of hydrous palladium oxide has been investigated by powder diffraction with both X-rays and neutrons, transmission electron microscopy, inelastic neutron scattering spectroscopy, infrared spectroscopy, and periodic-DFT calculations. The results clearly show the formulation as PdO·H 2 O is correct rather…