Materials Literature
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Tubes, dumbbells, and pyramids: A crystalline, large-pore, microporous semiconductor, |Rb18|[Sb36O54][(SbTe3)2(Te2)6] (Rb-CTH-1), which consists of an 18-ring {Sb18O27} tubular unit surrounded by an intricate, ordered arrangement of trigonal-pyramidal {SbTe3}3− ions and Te22− dumbbells and lined with Rb+ ions, has bee…
Die Y-verzweigten π-Systeme in dreikernigen Cyaninen können durch formalen Zweielektronentransfer eine zentrale Methylencyclopropaneinheit mit drei kürzeren, isolierten π-Systemen bilden. Spektroelektrochemische Untersuchungen belegen die Reversibilität dieser Redoxreaktion mit ungewöhnlich großer Elektrochromie.
Abstract A series of ZnS/polyimide (PI) nanocomposite films with different ZnS contents have been successfully fabricated by incorporating ZnS nanoparticles with a diameter of 2–5 nm into polyamic acid, followed by a stepwise thermal imidization process. X‐ray photoelectron spectroscopy results confirm the successful…
A three-dimensional finite element program is described which attempts to simulate the nonlinear mechanical behavior of an aging human face with specific reference to progressive gravimetric soft tissue descent. A cross section of the facial structure is considered to consist of a multilayered composite of tissues wit…
We report here on the self-patterned growth of nanostructured epitaxial oxide thin films using a bottom-up approach. Different stepped (0001) sapphire surfaces have been used as templates to grow different nanostructured thin films of yttria-stabilized zirconia elaborated by a chemical solution deposition technique, n…
The mesoscopic and microscopic mechanisms giving rise to shape memory behaviour in single crystals of the ferromagnetic alloy Ni 54 Fe 19 Ga 27 have been investigated using polarized and unpolarized neutron diffraction. The measurements confirm that the Curie temperature T C coincides with the martensitic phase transi…
In this paper we present an extensive study of the electronic, magnetic, and transport properties of finite and infinite periodic atomic chains composed of carbon atoms and $3d$ transition metal (TM) atoms using first-principles methods. Finite-size, linear molecules made of carbon atomic chains caped with TM atoms, i…
Abstract Most rubber articles are prepared from filler‐elastomer compounds and dynamic mechanical data can give valuable insight into behavior of such systems. The aim of this study was to compare complex tensile modulus E * and complex shear modulus G * using seven types of vulcanized filled rubbers and two testing d…
We introduce a diffuse-interface approximation for solving partial differential equations on evolving surfaces. The model of interest is a fourth-order geometric evolution equation for a growing surface with an additional diffusive adatom density on the surface. Such models arise in the description of epitaxial growth…
This paper describes the development of a novel silicon (Si) cantilever beam device actuated by titanium–nickel (Ti–Ni) shape memory alloy (SMA) films. A Ti–Ni SMA film can yield high work output per unit volume, so a Ti–Ni film-actuated Si cantilever beam device is a prospective tool for use as a microelectromechanic…
Specific metal deposition on nanoparticles is of outstanding importance in molecular construction as well as for signal enhancement in bioanalytics. To characterize the growth mechanism we studied the enhancement process of immobilized gold nanoparticle ensembles at single particle level by atomic force microscopy, mo…
The catalytic activity of metal silicide for carbon nanotube (CNT) nucleation and growth is reported by systematically evaluating CNT synthesis on different metal silicide phases compared with pure metal catalysts. Using a combination of high-resolution microscopy, x-ray diffraction (XRD) and x-ray photoelectron spect…
We study the water octamer in a uniform electric field using the all-exchanges parallel tempering Monte Carlo method in the canonical ensemble. The heat capacity, quenched energy configurations, and the order parameter Q(4) are employed to understand the phase changes observed as a function of temperature and the stre…
We have studied the oxidation and reduction kinetics of Pd nanoparticles on Fe 3 O 4 as well as the CO oxidation kinetics on partially oxidized Pd nanoparticles. The structural properties of the Pd/Fe 3 O 4 model catalyst as well as its adsorption behavior have been studied in detail previously. Here we present the re…
Hoch aktive Dimetallkatalysatoren sind Pt-Co-Nanopartikel auf Yttriumoxid-stabilisiertem Zirconiumoxid (YSZ; siehe Bild), die in einem Schritt durch Coimprägnieren erhalten werden. Sie zeigen eine hohe katalytische Aktivität bei der selektiven Oxidation von CO in Gegenwart von Wasserstoff im Überschuss unterhalb 423 K.
A three-step method combining physical vapour deposition, grazing ion milling and thermal annealing techniques for large-area fabrication of nanodot arrays in anodic alumina oxide (AAO) templates is demonstrated. By this method, ordered arrays of Ni and Au nanodots with highly uniform diameters and a density of 1.2 ×…
The structural and magnetic properties of air sintered and Ar and O2 annealed La0.875Sr0.125Mn1−γO3+δ polycrystalline samples have been studied systematically. From the simultaneous refinement of room-temperature x-ray and neutron powder diffraction data, we have found that the crystal structure is orthorhombic (Pbnm,…
The Y-shaped π systems in trinuclear cyanines can, through a formal two-electron transfer, form a core methylenecyclopropane unit with three shorter, isolated π systems (see picture). Studies of the spectroelectrochemistry verify the reversibility of this redox reaction, which has an unusually pronounced electrochromi…
Possible reappearance of the charge density wave transition in MxTiSe2 compounds intercalated with 3d metals, Baranov, N V, Maksimov, V I, Mesot, J, Pleschov, V G, Podlesnyak, A, Pomjakushin, V, Selezneva, N V
A large-scale computational and statistical strategy is presented to investigate the development of plastic strain heterogeneities and plasticity induced roughness at the free surface in multicrystalline films subjected to cyclic loading conditions, based on continuum crystal plasticity theory. The distribution of pla…