Materials Literature
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The La 10 - x (GeO 4 ) 6 O 3 - 1.5 x (9.33 ≤ 10 − x ≤ 10) apatite series has been synthesized and single phases have been obtained in a narrow compositional range (9.52 ≤ 10 − x ≤ 9.75). The apatites' phases are hexagonal (space group (s.g.) P 6 3 / m ) for 9.52 ≤ 10 − x ≤ 9.60 and triclinic (s.g. P1̄) for 9.66≤ 10 −…
Abstract A one‐way analysis of variance and thermal analysis were performed in this study to examine the influences of the contents, types (exothermic vs. endothermic), and forms (pure vs. masterbatch) of chemical foaming agents (CFAs), as well as the use of coupling agents, on the density reduction (or void fraction)…
Since the early days of small-angle scattering (SAS), this technique has been used to characterize the structure of solid materials on the nanometer scale. Some recent developments in this field will be reviewed, focusing on alloys, ceramics and (nano-) composite materials. The large field of SAS from polymeric system…
Substrate and nanotube polarization are shown to change qualitatively a nanotube bandstructure. The effect is studied in a linear approximation in an external potential which causes the changes. A work function difference between the nanotube and gold surface is estimated to be large enough to break the band symmetry…
We consider close-packed dimers, or perfect matchings, on two-dimensional regular lattices. We review known results and derive new expressions for the free energy, entropy, and the molecular freedom of dimers for a number of lattices including the simple-quartic (4^4), honeycomb (6^3), triangular (3^6), kagome (3.6.3.…
Titania microtubules with high specific surface areas and well-developed framework mesopores forming the tubular walls by a surfactant-mediated template in the sol−gel process were fabricated in a laurylamine hydrochloride (LAHC)/tetra- n -butyl-orthotitanate (TBOT) system. The outer diameter and the wall thickness of…
Organization of photoresponsive azobenzene ligands within a 3D porous framework imparts new molecular-level functionality. The trans⇌cis conformation change of azobenzene ligands triggered by photoirradiation transduces photo energy into mechanical work, which can be used for opening and closing valves (see picture).
The influence of the Rashba spin-orbit coupling on the electron spin dynamics is investigated for a ballistic semiconductor quantum wire with a finite width. We monitor the spin evolution using the time-dependent Schrödinger equation. The pure spin precession characteristic of the 1D limit is lost in a 2D wire with a…
Iterative multiscale methods for electronic structure calculations offer several advantages for large-scale problems. Here we examine a nonlinear full approximation scheme (FAS) multigrid method for solving fixed potential and self-consistent eigenvalue problems. In principle, the expensive orthogonalization and Ritz…
Vapor pressures were measured for the system chloroform/polyethylene oxide (peo, weight average molar mass = 1000 kg/mol) at 25 degrees centigrade as a function of the weight fraction w of the polymer by means of a combination of head space sampling and gas chromatography. The establishment of thermodynamic equilibria…
Recent results using a new combined small-angle/wide-angle X-ray scattering (SAXS/WAXS) beam line at the European Synchrotron Radiation Source (ESRF) will be presented. This beam line is specifically designed to be able to handle complicated sample environments required to perform time-resolved experiments mimicking p…
A hollow-structured and highly ordered mesoporous aluminosilicate with a 3D pore network and significantly improved hydrothermal stability has been successfully prepared by a simple method. To elucidate its novel structure and improved hydrothermal stability, a model for the formation of such a hollow spherical materi…
The application of theoretical methods based on the density functional theory with hybrid functionals provides good estimates of the exchange coupling constants for polynuclear transition metal complexes. The accuracy is similar to that previously obtained for dinuclear compounds. We present test calculations on simpl…
Nature exploits self-organization of soft materials in many ways, to produce cell membranes, biopolymer fibers and viruses, to name just three. Mankind is now able to design materials at the nanoscale, whether through atom-by-atom or molecule-by-molecule methods (top-down) or through self-organization (bottom-up). The…
A uniform stripe-shaped domain (SSD) structure was obtained in the initial ferroelectric liquid crystal (FLC) alignment by rubbing the polyimide films doped with silicon naphthalocyanine. Such a surface-stabilized FLC cell exhibits a high contrast ratio and excellent bistability. Atomic force microscope images and pre…
Amorphous carbon (a-C) films were fabricated in pure methane plasma by using the radio frequency plasma-enhanced chemical vapor deposition (RF PECVD) system. Surface morphology and roughness of the films were examined as a function of substrate temperature by atomic force microscopy (AFM). Field emission from the a-C…
We analyse experimental ac conductivity data of various glassy (61SiO 2 ·35Li 2 O·3Al 2 O 3 ·P 2 O 5 and alkali triborates of formulae M 2 O·3B 2 O 3 with M = Li, Na, K or Rb) and crystalline ionic conductors (Li 0.18 La 0.61 TiO 3 and yttria stabilized zirconia with a 16% molar yttria content, (Y 2 O 3 ) 0.16 (ZrO 2…
In this paper we make some general comments on the methods used for modelling glasses and use glassy GeSe 2 as an example. We then emphasize recent work on As–Se glasses, including glassy As 2 Se 3 and amorphous AsSe. The topology and electronic and vibrational properties of the models are discussed and with their use…
We use classical molecular dynamics simulations to study the motion of sodium atoms in amorphous Na 2 O – 4SiO 2 over a wide range of temperatures below and above the glass transition temperature T g . We find that the region of space most visited by the sodium atoms forms a network of connected pockets that we call c…
We report on the photo-response behavior of n-ZnO/p-Si photodiodes. Semiconducting n-ZnO films have been deposited on p-Si substrate by RF sputtering at 300, 480 and 550°C. An optimum static photo-response was achieved from the photodiode prepared at 480°C as characterized by photocurrent measurements using a continuo…