Materials Literature
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Abstract Wasserstoffperoxid wird heutzutage durch einen indirekten Prozess produziert, der auf der sequenziellen Hydrierung und Oxidation eines Alkylanthrachinons beruht. Auf diese Weise werden der Wasserstoff und Sauerstoff während des Produktionsprozesses voneinander getrennt gehalten. Ein Prozess, in dem molekulare…
Cooking in a small pot: Uniform zeolite particles (see picture) can be prepared in high yield by hydrothermal syntheses within the confinement of inverse-opal carbon reactors. The product morphology depends on interfacial interactions at the reactor walls and on other parameters that can be engineered into the reactor…
Coarse-grained (CG) modeling has emerged as a promising tool to bridge the gap between the temporal and spatial scales of all-atom (AA) simulations and those of many important biological processes. Resolution exchange, a variant of the replica exchange method, combines the efficiency of CG simulation and the accuracy…
The approach of designing cloaks with arbitrary shapes was investigated. The coordinate transformation was considered as a homeomorphous topological mapping and the related geometrical description was proposed by introducing position surfaces and tracing lines. Then an approximation approach was presented, which consi…
Spider dragline silk is primarily composed of proteins called major ampullate spidroins (MaSps) that consist of a large repeat array flanked by nonrepetitive N- and C-terminal domains. Until recently, there has been little evidence for more than one gene encoding each of the two major spidroin silk proteins, MaSp1 and…
High-resolution transmission electron microscopy and electron energy loss spectroscopy (EELS) were performed on electrochemically anodized niobium and niobium oxide. Sintered anodes of Nb and NbO powders were anodized in 0.1 wt% H3PO4 at 10, 20, and 65 V to form surface Nb2O5 layers with an average anodization constan…
Two-photon absorption associated with excited exciton states is theoretically studied in semiconducting carbon nanotubes within an effective-mass approximation. Sharp absorption peaks appear at energies of the second and fourth lowest exciton states below the interband continuum. The binding energy of the second lowes…
A series of Polynesian pearls has been investigated with particular attention to the structural and compositional patterns of the early developmental stages of the pearl layer. These initial steps in pearl formation bear witness of the metabolic changes that have occurred during the pearl-sac formation. The resulting…
We report on the structural instability of ${\text{Ni}}_{2}\text{MnAl}$ from calorimetry measurements and inelastic neutron scattering. The acoustic and optical phonon dispersions along the high-symmetry $[\ensuremath{\xi}00]$, $[\ensuremath{\xi}\ensuremath{\xi}0]$, and $[\ensuremath{\xi}\ensuremath{\xi}\ensuremath{\x…
The purpose of this study is to develop an analytical method to quantify the nitrogen present at the surface of paper by using X-ray photo-electronic spectroscopy (XPS). A sample of softwood thermomechanical pulp (TMP) was treated with a cationic starch containing primary amines, while another one was treated with a c…
Handbook of Mathematical Relations in Particulate Materials Processing goes beyond the traditional barriers of only one material class by covering the major areas in ceramics, cemented carbides, powder metallurgy, and particulate materials. Suited for quick reference with stand alone definitions. It is the perfect com…
Molecular-dynamics simulations are carried out on the wurtzitelike $(B4)$ to rocksaltlike structure $(B1)$ pressure-induced phase transition in ZnO. A tetragonal intermediate $(iT)$ appears at the $B4/B1$ interface along the transition. A hexagonal intermediate $(iH)$ of $h$-BN type is also occasionally visited, as a…
The silk formed in the major ampullate (MA) gland of the orb weaving spider Nephila clavipes is composed of two silk fibroins, which are called major ampullate spidroins 1 (MaSp1) and 2 (MaSp2). Analysis of proteolytic peptides and reactivity to spidroin type specific antibodies indicated that MaSp2 constituted only a…
Mn (6.6–29.8%)-doped CuO thin film fabricated on a thermally oxidized silicon substrate by radio-frequency magnetron sputtering has been reported. The films were structurally characterized using x-ray diffraction with Rietveld refinement. The analysis indicates that Mn uniformly substituted at the Cu position in the C…
Abstract Antistatic composites of poly(ethylene terephthalate) (PET) and tetrapod‐shaped ZnO whisker (ZnOw), the surface of which was treated with a coupling agent, were prepared by melt‐mixing using a twin screw extruder. The structure and morphology of the blends were examined by FTIR and SEM. Antistatic performance…
Crystallization, surface morphology, and electrical behavior of BiFeO 3 thin films are improved by SrRuO 3 (SRO) buffer layer with optimized grain size. Large‐grained SRO buffer layer promotes the growth of dense multiferroic BiFeO 3 (BFO) thin films and reduces structural defects. Phase identification by using X‐ray…
N-vinyl carbazole (NVCz) random polymers were electrochemically coated onto micron-size carbon fibers in lithium perchlorate/acetonitrile$({\hbox {LiClO}}_{4} /{\hbox {ACN}})$, sodium perchlorate/acetonitrile$({\hbox {NaClO}}_{4} /{\hbox {ACN}})$, and tetraethylammonium tetrafluoroborate/acetonitrile$({\hbox {TEABF}}_…
Accurate imaging of atherosclerosis is a growing necessity for timely treatment of the disease. Magnetic resonance imaging (MRI) is a promising technique for plaque imaging. The goal of this study was to create polymeric particles of a small size with high loading of diethylenetriaminepentaacetic acid gadolinium (III)…
We report here extensive measurements of the temperature dependence of phonon density of states of ${\text{BaFe}}_{2}{\text{As}}_{2}$, the parent compound of the FeAs-based superconductors, using inelastic neutron scattering. The experiments were carried out on the thermal time-of-flight neutron spectrometer IN4 at th…
Two competing mechanisms of intrinsic defect formation in amorphous ${\text{SiO}}_{2}$ $(a{\text{-SiO}}_{2})$, i.e., the vacancy-interstitial (Frenkel) mechanism and Si-O bond dissociation to form silicon and oxygen dangling bonds, were compared under $\ensuremath{\gamma}$-ray electronic excitation. The Frenkel mechan…