Materials Literature
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Nanoporous ZnO microcheerios were fabricated in a controlled fashion by oxidizing the DC sputtered metallic Zn crystals. The growth mechanism and photonic behavior of the materials with such a nano/microstructure were investigated and characterized in detail. It was demonstrated that the large surface energy caused by…
The total-field-scattered-field formulation of the finite-difference time-domain method (FDTD) is used to analyze the diffraction of finite incident beams by finite-number-of-periods holographic and surface-relief gratings. Both second-order and fourth-order FDTD formulations are used with various averaging schemes to…
We give experimental evidence for an intrinsic magnetic moment in ZnO films prepared by pulsed laser deposition. In our study using magnetic measurements, we showed that we are able to tune the magnetic moment in ZnO by changing the oxygen content. We also observe that doping of 5% Co in ZnO does not introduce ferroma…
We have studied the phase separation of a binary mixture of a polymer and a nematic liquid crystal at a dilute polymer concentration. Various types of regular self-assemblies of polymer droplets such as branched chains and zigzag chains have been observed in addition to the previously reported straight chains. The kin…
The mechanical behaviour of extruded AZ31B magnesium alloy with two different textures subjected to uniaxial tensile loading was studied. Monotonic and cyclic tensile tests were carried out at ambient temperature, and acoustic emission (AE) signals were recorded to detect various deformation processes occurring during…
The dynamical instabilities of AgI are extensively studied using the density-functional perturbation theory to probe the mechanism of the pressure-induced phase transitions of wurtzite . Analysis of the phonon calculations suggested that the pressure-induced instabilities of the transverse acoustic (TA) modes at the M…
The magnetic behavior of Ni-ferrite (NiFe2O4) nanoparticles synthesized in a solid state reaction process has been investigated. The cooling field, HCF, dependence of magnetization in a wide range of temperatures, from 5 to 300 K, has been examined for low and high field regimes. It has been observed that there is a t…
In this work, we demonstrate that activation pathways for dislocation loop nucleation from cracktips can be explored with full atomistic detail using an efficient form of the nudged elastic band method. The approach is demonstrated in detail with an example of edge emission from an Fe crack under mode II loading, wher…
The guanosine derivative 1 functionalized with the persistent radical unit 4-carbonyl-2,2,6,6-tetramethylpiperidin-1-oxyl in solution has no particular intermolecular spin-spin interactions; however, in the presence of potassium ions this compound can form a D4-symmetric octameric assembly [1(8)K]+ in which the nitrox…
Abstract Polylactide (PLA) homo‐ and stereocopolymers containing 100, 98, 96, 94, and 92% L ‐lactyl units, respectively, were synthesized by ring opening polymerization of L ‐lactide and DL ‐Lactide, using zinc lactate as catalyst. Differential scanning calorimetric analysis measurements show that incorporation of D ‐…
We report a DFT study on the self-assembly of the fullerene derivative PCBM on the Au(111) surface. Recent STM experiments (Angew. Chem. 2007, 119, 8020-8023([1])) show a coverage-dependent transition of the adsorption and self-assembly of PCBM on this surface. To understand the origin of this observation, we compute…
Abstract The thermal degradation of chitosan and chitosan–cupric ion compounds in nitrogen was studied by thermogravimetry analysis and differential thermal analysis (DTA) in the temperature range 30–600°C. The effect of cupric ion on the thermal degradation behaviors of chitosan was discussed. Fourier transform‐infra…
The cluster-glass compound LaMn 0.7 Fe 0.3 O 3 was synthesized with average particle sizes ∼20, ∼90, and ∼300 nm. We observed a shift of the magnetic hysteresis loop in the field axis while the sample was cooled in an external magnetic field. The systematic shift of the hysteresis loops and the cooling field dependenc…
In the biomineralization processes, proteins are thought to control the polymorphism and morphology of the crystals by forming complexes of structural and mineral-associated proteins. To identify such proteins, we have searched for proteins that may form high-molecular-weight (HMW) aggregates in the matrix of fish oto…
We have performed a theoretical study of the effect of doping the half-Heusler alloy NiMnSb with the magnetic $3d$ metals Cr, Mn, Fe, Co, and Ni, with respect to both energetics and magnetic properties. Starting from the formation energies, we discuss the possibility of placing the dopant on different crystallographic…
We report an observation and mechanism of spontaneous periodic modulations of the nematic director close to the temperature T(NA) of a nematic-to-smectic-A phase transition if the surface alignment slightly differs from a pure homeotropic one. Stripe domains appear in the nematic phase about one degree above T(NA) and…
Abstract Ethylene–propylene–diene rubbers (EPDM) with 2‐ethylidene‐5‐norbornene (ENB), dicyclopentadiene (DCPD), and 1,4‐hexadiene (HD) as third monomers have been vulcanized with peroxide and with a conventional sulfur vulcanization recipe, and their devulcanization was subsequently investigated for recycling purpose…
A series of silicon(IV) phthalocyanines with two axial isopropylidene-protected galactose moieties and one, two, or eight chloro group(s) on the periphery of the macrocycle have been synthesised and spectroscopically characterised. The photophysical properties and in vitro photodynamic activities of these compounds ha…
AIMS: This study sought to develop a less expensive medium for growth of the polyhydroxyalkanoate-producing bacterium Rhodospirillum rubrum from the ethanol production coproduct, condensed corn solubles (CCS). METHODS AND RESULTS: Small-scale trials using R. rubrum were performed in aerated or anaerobic stoppered seru…
The growth, composition, and structural properties of one-dimensional Bi 2 S 3, CdS, and SnS x nanostructures, confined within the channels of anodic alumina membranes, have been comprehensively investigated by electron microscopy and spectroscopy. In particular, the morphology, loading factors, crystal structure and…