Materials Literature
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This paper presents a model describing the hysteresis in ferroelectric materials at moderate to high driving levels and from quasi-static frequency to high dynamics. To a quasi-static model, based on a simple mechanism related to the dry-friction concept, is added a polarization fractional derivative term to take into…
The influence of size, anisotropy and doping effects on the hysteresis loop of ferromagnetic nanoparticles is studied, based on the modified Heisenberg model. A Green's function technique in real space allows the calculation of the dependence of the magnetization on the temperature, magnetic field, anisotropy, defects…
The oxo-bridged dimer [Mo(2)O(4)(mu(2)-O)Cl(2)(pzH)(4)] (1; pzH = pyrazole) exhibits unusually high activity in the liquid-phase catalytic epoxidation of the cyclic olefins cyclooctene and (R)-(+)-limonene under mild conditions and in the absence of additional organic solvents, using tert-butyl hydroperoxide as the ox…
Abstract Aerobic reactions of Co(O 2 CR) 2 with 2‐(hydroxymethyl)pyridine (hmpH), in the presence of ClO 4 – counterions give the hexanuclear, mixed‐valence clusters [Co II 4 Co III 2 (O 2 CR) 4 (hmp) 8 ](ClO 4 ) 2 [R = Me ( 1 ), Ph ( 2 )] which possess the unprecedented [Co II 4 Co III 2 (μ 3 ‐OR′) 4 (μ‐OR′) 4 ] 6+ […
Stabile, hell leuchtende Nanopartikel aus konjugierten Polymeren (CPNs) sind aussichtsreiche Systeme für die Fluoreszenzbildgebung lebender Zellen. Die zellgängigen CPNs werden durch einfachen Lösungsmittelaustausch synthetisiert und reichern sich ohne merkliche Beeinträchtigung der Zellfunktionen ausschließlich im Cy…
A series of 2,2'-bipyrroles has been efficiently synthesized using an improved synthetic approach based on Pd(0)-catalyzed homocoupling of various 2-iodopyrroles. This new synthetic approach takes place at room temperature and in the presence of water. Functional groups such as formyl, ester, and nitrile are able to s…
The experimental researches on Equal Channel Angular Extrusion (ECAE) process of commercial available Al-6061 alloy were conducted and the grain refinement after ECAE processing was investigated. Sixteen passes of ECAE processing at room temperature were conducted and the relationship of grain refinement with extrusio…
IF-Mo1-xNbxS2 nanoparticles have been synthesized by a vapor-phase reaction involving the respective metal halides with H2S. The IF-Mo1-xNbxS2 nanoparticles, containing up to 25% Nb, were characterized by a variety of experimental techniques. Analysis of the powder X-ray powder diffraction, X-ray photoelectron spectro…
Carbohydrates on cell surfaces contribute a variety of communications between the cell and its environment, and they have been assumed to act as markers for cellular recognition. In this research, 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer nanoparticles, which can react with specific carbohydrates of targe…
The present work describes the molecular structure and the topology in real space of self-assembled comblike liquid crystalline polymers based on supramolecular ionic complexation of dendronized polymers and lipids. The molecular organization was studied as a function of the generation of the dendronized polymers and…
A group of hyperbranched poly(silylenephenylenes) ( hb -PSPs) were synthesized in high yields (up to 100%) by TaBr 5 -catalyzed polycyclotrimerization of A 2 -type monomers of silylenediynes [HC⋮C−C 6 H 4 −Si(C n H 2 n +1 ) 2 −C 6 H 4 −C⋮CH, n = 2, 4, 6]. The hb -PSPs are completely soluble in common organic solvents…
Like a big crown (ether): Cross-linked glycerol-based nanoparticles have been synthesized by ring-closing metathesis (RCM) of polyallyl glycerol dendrimers or hyperbranched polymers (see scheme). In organic solvents, the polyether nanoparticles show modest ionophoric abilities.
In this paper we present a two-dimensional (2-D) analysis of a narrow-slit, flat-plate, single-pass, flow-through photocatalytic reactor for air purification. The continuity equation for convection and diffusion in two dimensions, under un-steady-state conditions, was coupled with radiation field modeling and photocat…
Bi2Te3 plate-like crystals with homogeneous hexagonal morphology were rapidly synthesized using a microwave assisted wet chemical method in 30 min. These Bi2Te3 nanoplates possessed a fixed edge with a length of ~0.5–2 µm, and the thickness was less than ~100 nm. The n-type Bi2Te3 nanocomposites were prepared by conso…
We report the first-order and high-order Raman scattering from core-shell CdSe/CdS nanocrystals and investigate the evolution of the longitudinal mode of CdSe (LO1) and CdS (LO2), and the surface mode of CdSe (SO1) and CdS (SO2) with increasing shell thickness (0-5.5 ML (monolayer)). We find that the shift of the LO2…
We study the influence of Mn doping on the vibrational properties of rf sputtered ZnO thin films. Raman spectra of the Mn doped ZnO samples reveal two additional vibrational modes, in addition to the host phonon modes, at 252 and 524?cm?1. The intensity of the additional modes increases continuously with Mn concentrat…
We have performed a structural study of the morphotropic phase boundary system $(1\ensuremath{-}x)\mathrm{Bi}\mathrm{Sc}{\mathrm{O}}_{3\ensuremath{-}x}\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ in which both $A$ and $B$ sites of the perovskite are randomly occupied. A ${M}_{A}$ monoclinic phase coexisting with a tetragon…
BaSnO 3 crystallizes in a cubic perovskite structure and exhibits insulating behaviour. It can be made conducting by reducing a small fraction of Sn 4+ into Sn 2+ under an O 2 -free atmosphere. This can be achieved through the solid solution Ba 1− x La x SnO 3−δ which is a mixed phase for x > 0.02, behaviour readily u…
We investigate the conductance of normal-conductor/graphene/normal-conductor (NGN) junctions for arbitrary on-site potentials in the normal and graphitic parts of the system. We find that a ballistic NGN junction can display insulating behavior even when the charge-carrier density in the graphene part is finite. This…
The role of dislocations in stable p-type phosphorus-doped ZnO epitaxial films is investigated. It is shown that good p-type conductivity is always associated with a considerable increase in the density of dislocations, which can aid the formation of shallow complex acceptors and provide sinks for native donors.