Materials Literature
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We present a simple method for rendering Islamic star patterns based on Hankin's polygons-in-contact technique. The method builds star patterns from a tiling of the plane and a small number of intuitive parameters. We show how this method can be adapted to construct Islamic designs reminiscent of Huff's parquet deform…
Ein neues Niveau in der Programmierbarkeit und Freiheit beim Steuern des Kristallwachstums von Kupfer(I)-oxid wurde durch die systematische Einstellung des Verzweigungsgrades und des Kristallhabitus während der Elektroabscheidung erreicht. Beispiele von Cu2O-Kristallen, in denen diese Merkmale mithilfe rational entwor…
The critical length and density of the steps, rather than step morphology and velocity of deposition, are useful for understanding the effectiveness of the additive molecules in modifying the crystallization kinetics in biomineralization. This biological control stems from a change in solid–solution interfacial energi…
A new method of synthesis of meso-tetraaryltetranaphtho[2,3]porphyrins (Ar4TNP) has been developed. Ar4TNPs with peripheral functional groups are obtained by oxidative aromatization of meso-tetraarylporphyrins in which pyrrole units are fused with either octahydro- or dihydronaphthalene moieties. These precursor porph…
A polystyrene-b-poly(ethylene oxide) (PS-b-PEO) (MW = 141k, 11.4 wt% PEO) diblock copolymer in the hydrophobic regime was spread from chloroform solutions of various concentrations at the air-water interface, and the resultant monolayers were transferred to glass substrates and imaged using atomic force microscopy. Mo…
Cores and effect: Heating the cluster [W18O56(SO3)2(H2O)2]8− causes an electron transfer from the core sulfite anions to the cluster shell resulting in a color change from colorless to dark blue (see backgrounds). The electron transfer is coupled with a structural reorganization of the cluster shell and oxidation of t…
Wasserstoffreiche Materialien, die in Nanogerüste eingebracht sind, bieten einen vielversprechenden Zugang zu bordeigenen Wasserstoffspeichern. Das mesoporöse Gerüst reduziert die Temperatur für die Wasserstoff-Freisetzung aus Ammoniakboran (AB), einem gängigen Wasserstoffspeicher, auf unter 80 °C und liefert reineren…
Simulations of the dynamic deformations of metal samples require elastic-plastic constitutive updates of the material behavior to be performed over a small time step between updates, as dictated by the Courant condition. Depending on the deformation conditions, the converged time step becomes short (~$10^{-9} s$ or le…
Polyconvexity is one of the known conditions which guarantee existence of solutions of boundary value problems in finite elasticity. In this work we propose a framework for development of polyconvex strain energy functions for hyperelastic materials with cubic anisotropy. The anisotropy is captured by a single fourth…
We study the Magneto-Electric (ME) effect from the viewpoint of the Berry phase connection and quantum adiabatic charge transport (QAPT). The linear response theory for the electronic polarization $\vec{P}_{\rm{el}}$ can be interpreted in terms of the flux or the fictitious magnetic field related to the Berry phase in…
It is known that the relaxed excited state of [Ru(bpy)3]2+ is best described as a metal to ligand charge transfer (MLCT) state having one formally reduced bipyridine and two neutral. Previous reports have suggested [Malone, R. et al. J. Chem. Phys. 1991, 95, 8970] that the electron "hops" from ligand to ligand in the…
The mechanism of the effect of particle addition on sonochemical reaction is studied through the measurements of frequency spectrum of sound intensity for evaluating the cavitation noise and the absorbance for the liberation of iodine from an aqueous solution of KI as an index of oxidation reaction by ultrasonic irrad…
Vertically aligned single-crystal ZnO nanorods have been successfully fabricated on semiconducting GaN, Al0.5Ga0.5N, and AlN substrates through a vapor-liquid-solid process. Near-perfect alignment was observed for all substrates without lateral growth. Room-temperature photoluminescence measurements revealed a strong…
A new level of programmability and freedom in directing the crystal growth of cuprous oxide was demonstrated by controlling the degree of branching and crystal habit in a systematic manner during electrodeposition. Examples of Cu2O crystals in which these features were directed by rationally designing a growth conditi…
Hydrogen-rich materials infused in nanoscaffolds offer a promising approach to on-board hydrogen storage. A mesoporous scaffold decreases the temperature for hydrogen release from ammonia borane (AB), a conventional hydrogen-storage material, to below 80 °C and leads to an increase in the purity of the hydrogen releas…
The dynamics of randomly crosslinked liquids is addressed via Rouse-type and Zimm-type models with crosslink statistics taken either from bond percolation or Erdos–Rényi random graphs. While the Rouse-type model isolates the effects of the random connectivity on the dynamics of molecular clusters, the Zimm-type model…
Thin films of ZnxCd1-xSe were electrodeposited from an acidic aqueous solution of selenite (SeO2) and Cd-/Zn-sulphates. The film composition was determined by x-ray diffraction (XRD) and energy dispersive x-ray (SEM/EDX) spectroscopy. In addition, the structural and optical film properties were studied by micro-Raman…
Nano‐sized aluminum nitride (AlN) powders can enhance the sinterability of AlN ceramics. The present work examined the pulverization and dispersion of AlN powder using ZrO 2 beads of 0.1 mm in diameter as grinding medium in order to obtain nano‐sized powder for low‐temperature sintering. An attracting feature of the b…
Silicone rubber is routinely used for biomedical applications and, in several cases, the polymer surface has to be covered with a thin layer of a biocompatible metal such as titanium. The adhesion of a metal film to a silicone surface, however, constitutes a challenging issue.
The fracture energies of the tape‐cast silicon nitride with and without 3 wt% rod‐like β‐Si 3 N 4 seed addition were investigated by a chevron‐notched‐beam technique. The material was doped with Lu 2 O 3 –SiO 2 as sintering additives for giving rigid grain boundaries and good heat resistance. The seeded and tape‐cast…