Materials Literature
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The goal of this paper is to study the steady-state dynamic response of an oscillator involving a hysteretic component and exposed to harmonic excitation. This is accomplished by using the Preisach formalism in the description of the contribution of the hysteretic component. Two cases are considered. In the first one,…
Israelites using bricks made of clay and reinforced with straw are an early example of application of composites. The individual constituents, clay and straw, could not serve the function by themselves but did when put together. Some believe that the straw was used to keep the clay from cracking, but others suggest th…
Abstract A new tridentate ligand, {(3,5‐di‐ tert ‐butyl‐2‐hydroxybenzyl)amino}acetic acid, has been synthesized. This ligand forms [{Na 4 (H 2 O) 4 (μ‐H 2 O) 2 }(Mo 2 O 5 L 2 ) 2 ] ( 1 ), which contains an Na 4 4+ cluster cation stabilized by [LMoO 2 (μ‐O)MoO 2 L] 2– , upon reaction with Na 2 MoO 4 in aqueous methanol…
Abstract The compound [CoCu(opba)(DMSO) 3 ] ( 1 ) [opba = ortho ‐phenylenebis(oxamato)] has been synthesized and characterized. Its crystal structure has been analyzed by X‐ray diffraction techniques at 100 and 298 K. A structural phase‐transition has been detected at around 150 K. An orthorhombic crystalline system i…
A molecular dynamics simulation was performed to study the effect of an applied force on heat transfer at the interface of model diamond [111] nanosurfaces. The force was applied to a small, hot nanosurface at 800, 1000, or 1200 K brought into contact with a larger, colder nanosurface at 300 K. The relaxation of the i…
A mixed condensation of a substituted and unsubstituted silicon phthalocyanine monomer, in which the former serves as a "cap" to a growing oligomeric chain, provides unprecedented access to a mixed dimer, trimers, and a tetramer. An important element of product control can be achieved by changing the ratio of the prec…
The heat exchanged at the low-temperature first-order magnetostructural transition is directly measured in ${\mathrm{Gd}}_{5}{\mathrm{Ge}}_{4}$. Results show that the origin and the temperature dependence of the heat exchanged varies with the reversible/irreversible character of the first-order transition. In the reve…
We report on the up-converted ultraviolet near-band edge emission of bulk ZnO generated by visible and ultraviolet photons with energies below the band gap. This up-converted photoluminescence was observed in samples intentionally doped with Tm ions, suggesting that the energy levels introduced by the rare earth ion i…
We have investigated negative charge carrier transport in the smectic mesophases of the 2-phenylnaphthalene derivative, 6-(4'-octylphenyl)-2-dodecyloxynaphthalene (8-PNP-O12), using the time-of-flight (TOF) method. We revealed that the negative charge carrier transport in its smectic mesophases had two different mecha…
The conversion of sodium carbonate to sodium carbonate monohydrate and the subsequent growth of monohydrate crystals have been investigated by carrying out in situ measurements of particle size distribution by means of the focused beam reflectance method (FBRM). The conversion of sodium carbonate to sodium carbonate m…
A complete Raman scattering study on a lithium tetraborate single crystal is reported. The frequency and scattered intensity of Raman modes are carefully determined in the various geometrical configurations. These Raman data are then used to relate to the electro-optical and non-linear optical properties. Raman scatte…
A ferrimagnetic oxide of composition $\mathrm{Er}\mathrm{Fe}\mathrm{Mn}{\mathrm{O}}_{5}$ has been obtained by replacing half of the Mn atoms by Fe in $\mathrm{Er}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$. The crystallographic and magnetic structure have been studied by neutron powder diffraction (NPD) experiments, in complem…
Abstract Various properties of a cubic phase of SrTiO 3 perovskite containing single F centers (neutral oxygen vacancies), including energies of their formation and migration, were simulated using different formalisms of density functional theory (DFT) as implemented into CRYSTAL‐2003 and VASP computer codes. The latt…
Abstract The Mo 36 ‐polyoxometalate [Mo 36 O 108 (NO) 4 (H 2 O) 16 ] 12– reacts with Ln 3+ to give crystalline solids with 1D, 2D, and 3D polymeric frameworks, depending on the size of Ln 3+ and the reaction conditions. Reaction of LaCl 3 with (NH 4 ) 12 [Mo 36 O 108 (NO) 4 (H 2 O) 16 ] gives (H 3 O) 2 [{La(H 2 O) 5 }…
Abstract The novel heterobimetallic sodium‐bismuth‐oxo clusters [Bi 2 Na 4 O(OSiMe 3 ) 8 ] ( 1 ), [Bi 10 Na 5 O 7 (OH) 6 (OSiMe 3 ) 15 ] · 1.5C 7 H 8 ( 2· 1.5C 7 H 8 ), [Bi 15 Na 3 O 18 (OSiMe 3 ) 12 ] · C 7 H 8 ( 3· C 7 H 8 ) and [Bi 14 Na 8 O 18 (OSiMe 3 ) 14 (THF) 4 ] · C 6 H 6 ( 4· C 6 H 6 ) were prepared starting…
Three metal-organic polymers, [CoCl2(bpfp)]n 1, {[NiCl2(bpfp)2](H2O)3}n 2 and [ZnCl2(bpfp)]n 3 (bpfp = N,N'-bis(3-pyridylformyl)piperazine), are formed by the self-assembly of the flexible bpfp with MCl2 (M = Co, Ni, Zn), respectively. X-Ray single-crystal structural analysis reveals that polymer 1 exhibits a novel gr…
The synthesis of three‐dimensional (3‐D) assemblies of zirconia nanocrystals via the shape‐preserving reactive conversion of biologically reproducible, silica‐based microtemplates (diatom microshells) is demonstrated for the first time. Silica diatom microshells were first converted into magnesia replicas via an oxida…
Pb 0.97 La 0.02 ( Zr 0.65 Sn 0.22 Ti 0.13 ) O 3 ceramic was confirmed to be in an antiferroelectric (AFE) phase at T<170°C by macroscopic and microscopic studies. The electric-field-induced ferroelectric (FE) state was found to exhibit a much longer lifetime than the reasonable laboratory measuring time scale a…
Abstract This study investigated the role of layered silicate clay on morphology development in chaotic mixing of two immiscible polymers, polypropylene (PP) and polyamide 6 (PA6). The study showed that clay particles helped to produce droplets of much smaller size and with narrower size distribution due to their dire…
Conventional fixed-bed catalytic reactors have obvious disadvantages, such as maldistributions of various kinds (resulting in nonuniform access of reactants to the catalytic surface and nonoptimal local process conditions), large pressure drop over the bed, and sensitivity to fouling by dust. Due to the random and cha…