Materials Literature
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X-ray diffraction studies of "tobermorite 10 Å", obtained through heating of the "anomalous" tobermorite 11 Å from N'Chwaning II mine (Kalahari Manganese Field, RSA), show the widespread structural disorder that arises during the transformation from tobermorite 11 Å to the 10 Å phase. The diffraction pattern of th…
Photoisomerization: N-phenylcarbazole-conjugated dimethyl 2,3-diethynylfumarate/maleate, E/Z-4, shows highly efficient and reversible visible-light E/Z photoisomerization (Φtotal=0.40) upon excitation with an intramolecular charge-transfer band. This photochromism induces switching of electronic communication between…
Charge redistribution at graphene/dielectric interfaces is predicated upon the relative positioning of the graphene Fermi level and the charge neutralization level of the dielectric. The authors present an angle-resolved near-edge x-ray absorption fine structure (NEXAFS) spectroscopy investigation of single-layered gr…
Stair-like metamagnetic transitions in the oxygen deficient La 0.5 Ca 0.5 MnO 3−δ perovskite are here for first time reported. This experimental fact sheds light on the knowledge of metamagnetic transition in anion deficient phase segregations systems. Actually, it is shown that controlled reduction of the oxygen cont…
Sierpinski-Kohlenstoff: Von makroporösem Carbiden abgeleitete Kohlenstoffmonolithe (DUT-38) mit einer hierarchischen Porenstruktur aus Mikro-, Meso- und Makroporen, einer großen spezifischen Oberfläche und einem großen Makroporenvolumen wurden hergestellt. Diese Materialien sind ideale Adsorbentien, da hohe Speicherka…
Abstract New tetrathiafulvalene (TTF)‐based electron‐donor molecules having 4,4′‐ and 2,2′‐biimidazole units ( 1 and 2 , respectively) as hydrogen bonding units were designed and synthesized. Cyclic voltammetry showed that both 1 and 2 possess strong electron‐donating abilities close to that of TTF with two‐stage reve…
Abstract The ring‐opening polymerization of glycidol at elevated temperatures is investigated. To improve the synthesis of dendritic polyether polyols, experiments are carried out without initiator to identify the influence of thermal side reactions. This results in a step‐growth polymerization caused by the spontaneo…
This work is related to an earlier publication [Schwaiger et al., Phys. Rev. Lett. 102, 163903 (2009)], where we demonstrated by means of fiber-based transmission measurements that rolled-up Ag-(In)GaAs multilayers represent three-dimensional metamaterials with a plasma edge which is tunable over the visible and near-…
Metal amidoboranes, M(NH 2 BH 3 ) n (M = alkali metal or alkaline-earth metal), are candidates for on-board hydrogen storage materials with high gravimetric capacity, low H 2 release temperature, and the ability to suppress toxic borazine emission. We have used a first-principles density functional theory (DFT) combin…
Influence of boron on densification and microstructure of zirconium diboride ( ZrB 2 ) ceramics using pressureless sintering has been studied. The ZrB 2 powders were synthesized by borothermal reduction of ZrO 2 with three different ZrO 2 / B ratios to produce powders nominally phase pure or that contained excess boro…
Different dense and porous biodegradable matrices based on solely atelocollagen, or with different atelocollagen and hyaluronic acid derivative ratios, were obtained by varying feeding formulations, cross-linking reaction parameters, and preparative protocols. The compositions and methods for forming hydrogels through…
Doping catalytically inactive materials with dispersed atoms of an active species is a promising route toward realizing ultradilute binary catalyst systems. Beyond catalysis, strategically placed metal atoms can accelerate a wide range of solid-state reactions, particularly in hydrogen storage processes. Here we analy…
Paseroite, ideally PbMn 2þ (Mn 2þ ,Fe 2þ )2(V 5þ ,Ti,Fe 3þ ,&)18O38, is a new mineral (IMA2011-069) from fossil wood in the upper part of the Molinello mine, Val Graveglia, Italy. Paseroite occurs in direct association with quartz, chalcocite, volborthite, metatyuyamunite and pyrophanite, and was also found as zones w…
Magnetotransport in bilayer graphene in the presence of a weak and periodic potential is investigated in the presence of a perpendicular magnetic field $B$. The modulation broadens the Landau levels into bands and for weak magnetic fields leads to the well-known Weiss oscillations in their bandwidth and their transpor…
Hierarchically self-assembled hydroxyapatite (HAP) and organic composite resembling tooth enamel has potential biological and surgery applications. Controlled fabrication remains a great challenge. In this work, large-scale translucent hydroxyapatite (HAP) and chondroitin sulfate (ChS) composite films are fabricated b…
Abstract Four D–A–D type co‐oligomers have been synthesized by Stille condensation between monostannyl derivatives of furan/thiophene/selenophene/3,4‐ethylenedioxythiophene (EDOT) and 4,7‐dibromo‐benzo[1,2,5]oxadiazole. All these co‐oligomers were successfully electrochemically polymerized in dichloromethane and chara…
Recent experiments have demonstrated a viable bottom-up strategy to produce narrow and highly ordered nanoribbons, including complex segmented structures called graphitic nanowiggles (GNWs). These defect-free systems are made of successive repetitions of finite-sized graphitic nanoribbons (GNRs) regularly connected at…
We consider a liquid trapped in a narrow horizontal capillary, under the influence of gravity. As the slit is widened, the meniscus, separating the capillary liquid from gas, deforms and develops a long tongue extending along the bottom wall. As a critical slit width is approached, the length of the tongue diverges co…
A new method to increatse the operation speed for optical rewritable (ORW) liquid crystal alignment technology has been proposed. Conventionally, we prepared the azo dye layer by spin-coating solution of SD1 with different concentrations. The new method is to form a super thin azo-dye molecular alignment layer for LC…
Photoswitchable click amino acids (PSCaa) are amino acids bearing a side chain consisting of a photoswitchable unit elongated with a functional group that allows for a specific click reaction, such as an alkene that can react with the thiol group of a cysteine residue. An intramolecular click reaction results in the f…