Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetism of Lanthanides in Molecular Materials with Transition-Metal Ions and Organic RadicalsCristiano Benelli and Dante GatteschiView Author Information Department of Chemistry, University of Florence, UdR INSTM, Polo Scientifico Universitario, I 50019 Sesto Fiorentino, I…
The fine structures of low-temperature photoluminescence (PL) spectra of TiO 2 thin films with addition of ZnFe 2 O 4 (ZnFe 2 O 4 /TiO 2 composite films) are firstly reported. The films were deposited on quartz substrates by radio-frequency magnetron sputtering method. It is shown that different phase structures are d…
Deactivation of the lowest excited triplet (π,π*) state, 3 (π,π*), of the cationic water-soluble Cu(II)-5,10,15,20- meso -tetrakis(4- N -methylpyridyl)porphyrin (CuTMpyP4) was studied by femtosecond transient absorption spectroscopy in three oxygen-containing solvents (Lewis bases) of various polarity, water, methanol…
We report on first-principles band-structure calculations of the semiconducting CuAlO 2 delafossite compound in the pure form and also with Cd impurity occupying either a Cu or Al position. The computational tool was a full-potential linear augmented plane-wave method, with the generalized gradient approximation accou…
The ferromagnetic coupling behavior in oxo-bridged bis(bis(cyclopentadienyl)titanium(III)) complex (Cp 2 Ti) 2 (μ-O) is investigated on the basis of calculations of density functional theory combined with the broken-symmetry approach. The magnetic coupling constants calculated for the experimental and optimized geomet…
Superlattices in the Pb−Tl−O system with modulation wavelengths varying from 5.2 to 18.9 nm were epitaxially electrodeposited on single-crystal Au(100) by periodically pulsing the current anodically between 0.05 and 5 mA/cm 2 . The films were grown at room temperature from an aqueous solution of 0.005 M TlNO 3 and 0.1…
Reflection−absorption infrared (RAIR) and surface-enhanced Raman scattering (SERS) spectroscopy were used to determine the orientation of the bulk and interface of a polymer thin film formed by atactic poly(methyl methacrylate) (a-PMMA) which was dip-coated onto a novel dual-sided substrate. The novel substrate with s…
Absolute total cross sections (TCSs) for the electron scattering from two structured isomers of C 3 H 6 (propene and cyclopropane) have been determined over the energy range from 0.5 up to 370 eV in a linear electron-beam transmission experiment. The TCS for propene is generally higher than that for cyclopropane, espe…
Abstract A new chain‐extension modifier for bismaleimide (BMI), 2,6‐di‐(4‐aminophenoxy)benzonitrile (DAPB), was synthesized through nucleophilic substitution of 2,6‐dichlorobezonitrile by 4‐aminophenol using anhydrous sodium carbonate as an acid acceptor, toluene as a dehydrating agent, and N , N ′‐dimethylacetamide (…
We perform optimal designs of two applicable configurations of multistage thermoelectric (TE) coolers, with serial and separate electric currents flowing through each stage, respectively. The finite-rate heat transfers between the coolers and reservoirs are taken into account. A general optimization method is develope…
Abstract The compatibility behavior of polyetherether ketone (PEEK) with poly(ether sulfone) (PES) has been reexamined using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and extrudate swell measurements. The blends were prepared by both melt‐blending and solution‐blending techniques. Th…
Two new thermoelectric materials of quaternary bismuth telluride CsPb3Bi3Te8 and CsPb4Bi3Te9 are reported, which are members of a homologous series featuring anionic slabs [PbmBi3Te5 + m]- (m = 1-4) of monotonically increasing thickness.
Computational techniques are used to estimate porous shape memory alloy material behavior in this study. Mesoscale analysis techniques based on a two-dimensional finite element method are used to evaluate a representative volume element (RVE) to determine effective material response. The porous shape memory alloy is d…
We have studied conformational properties of flexible polymers partially confined to narrow pores of different size using configurational biased Monte Carlo simulations under athermal conditions. The asphericity of the chain has been studied as a function of its center of mass position along the pore axis and as a fun…
Abstract Various water‐soluble hyperbranched poly(ester amine)s were synthesized by the direct polyaddition of diamines to diacrylates in the absence of a catalyst. Each diamine contained a secondary amino group and a primary amino group such as 1‐(2‐aminoethyl)piperazine, N ‐methyl‐1,3‐propanediamine, or N ‐ethylethy…
Excitation into the Yb 3+ 2 F 5/2 excited states leads to visible-by-eye green luminescence spanning the spectral region from 490 to 790 nm, with a quadratic power dependence. Optical absorption, luminescence, and excitation spectroscopy as well as pulsed measurements on single-crystal SrCl 2 :Yb(1%), Tb(1%) are used…
The trinuclear copper(II) complex [Cu3(cpse)3(H2O)3]·8.5H2O has been obtained from mononuclear [Cu(Hcpse)2]·H2O {H2cpse = N-[2-hydroxy-1(S)-methyl-2(S)-phenylethyl]-N-methylglycine, threo isomer} and crystallographically characterised. The structure of the compound consists of three CuII atoms, each having distorted s…
Semiconducting Cu 2 O thin films were electrodeposited potentiostatically on Cu and SnO 2 substrates. The deposition kinetics of film growth and the conditions to obtain spotty and uniform Cu 2 O films are studied. X-ray diffraction studies revealed the formation of single phase cubic Cu 2 O films. The effects of depo…
Undoped ZnO and F-doped ZnF x O (1− x ) ( x = 5 at%) films prepared by the spray pyrolysis (SP) technique have been studied using cathodoluminescence imaging and spectroscopy, x-ray diffraction and spectrophotometry. These films, deposited at the optimal substrate temperature ( T s = 450 °C), present a hexagonal close…
This paper has experimentally addressed the determination of the convection coefficient for a nichrome and nickel-titanium (NiTi) shape memory alloy (SMA) wire subjected to constant load, heated by electrical current and cooled by free convection (with the current switched off). The entire cycle of actuation is such t…