Materials Literature
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The determination of local strain fields at the surface of materials is of major importance for understanding their reactivity. In the present paper, lithography is used to fabricate grid points at the microscale and to map strain gradients within grains and between grains. This method was applied to duplex stainless…
The solid solubility of Ho 3+ in BaTiO 3 fired under the reducing conditions of a nitrogen atmosphere containing 10% of hydrogen was studied by quantitative electron‐probe microanalysis using wavelength‐dispersive spectroscopy. The solubility was found to depend mainly on the starting composition. In the TiO 2 ‐rich s…
Three in one: The oxidation of methane to methyl derivatives, conversion of the methyl derivatives into oxygenated compounds, and regeneration of the oxidation media are the three steps involved in the catalytic partial oxidation of methane by MoO2Br2 supported on Zn-MCM-48 (see scheme). Reversible bromine metathesis…
Schwämme nachgeahmt: Gut definierte kristalline Nanopartikel von kubischem BaTiO3 werden bei sehr niedriger Temperatur mit einem durch die Natur inspirierten Verfahren erhalten. Ein Dimetallalkoxid dient als alleinige Vorstufe in einer Dampfdiffusions-Sol-Gel-Synthese. Wasser und der Katalysator (HCl) werden mit einem…
We show that for arbitrary thermodynamic conditions, master curves of the entropy are obtained by expressing S(T, V) as a function of TV γ G , where T is temperature, V specific volume and γG the thermodynamic Grüneisen parameter. A similar scaling is known for structural relaxation times, τ = ℑ (TV γ); however, we fi…
We examine properties of a reaction front that forms in irreversible reaction-diffusion systems with concentration-dependent diffusivities. We study two different models of such systems and find that in the limit of a vanishingly small diffusivity of the reaction product, the reaction front dynamics enters a separate…
B 2 O 3 mineralizes spinel formation from stoichiometric (1:1 mole ratio) calcined magnesia and alumina. After 3 h at 1100°C, X‐ray diffraction (XRD) shows the mineralization effect of B 2 O 3 is limited to 1.5 wt% additions with higher B 2 O 3 contents leading to Mg 3 B 2 O 6 formation and reduced spinel content. Bor…
The synthesis of Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) with high‐energy milling was studied by X‐ray powder diffraction (XRD) using the Rietveld‐refinement method. The results are discussed in terms of the qualitative and quantitative composition of the crystalline and amorphous phases as a function of milling time. The mechano…
Going bananas: In a twisted geometry, an extrinsically chiral supermolecular structure was obtained in the calamitic phase. Upon cooling down to form the Bx phase, imbalanced growth of an intrinsic preferential chiral structure was attained. The preferential chiral handedness of the banana mesophase can be also contro…
Abstract In this work, the behavior of exothermic chemical reactions conducted in a wall‐cooled, semibatch stirred‐tank reactor is studied, with particular attention to conditions that lead to a thermal accident. The dimensionless heat and mass conservation equations for a semicontinuous tank were solved using second‐…
Ba 0.55 Sr 0.45 TiO 3 /MgO composites were successfully prepared by the heterogeneous precipitation method and their structural, surface morphological, tunable properties, and dielectric properties at microwave frequency were systemically investigated. Compared with the sample prepared by the traditional solid‐state m…
The first perylenophthalocyanines have been synthesised using a Diels-Alder reaction between dialkylperylenes and fumaronitrile as the key step towards the dinitrile precursors. As expected the octaalkylperylenophthalocyanines show red-shifted absorption spectra. They are high melting solids that do not display mesoph…
Cs‐deficient pollucite compounds with the general composition Cs 1− x Al 1− x Si 2+ x O 6 and a cubic pollucite structure at room temperature (RT) were prepared by a multistep solid‐state reaction. The single phase of the products was confirmed by powder X‐ray diffraction (XRD) analysis at RT. Structural phase transit…
The interaction of a dispersant and a binder at the Ni particle surface is investigated to identify their influence on the dispersion stability of Ni particles in dihydroterpineol (DHT). Six different commercial dispersants are used to obtain a highly dispersed Ni suspension, and ethyl cellulose (EC) is used as a bind…
Putting two and two together: An ordered mesoporous silica crystal of the cage type with cubic Fmm symmetry was prepared by using a gemini surfactant as template. Icosahedral, decahedral, and plate morphologies are discussed (see SEM image). The structure is explained by the occurrence of multiple twinning during the…
Functionally graded SiAlON ceramics (FG‐SiAlONs) were successfully prepared by the tape casting and lamination approach. Non‐aqueous SiAlON slurries with five different α to β‐SiAlON ratios (85α:15β, 70α:30β, 55α:45β, 40α:60β, and 25α:75β) were prepared by a 66 methyl ethyl ketone/34 ethanol (vol%) mixture. Phase and…
The vulcanization of rubber by sulfur is a large-scale industrial process that is only poorly understood, especially the role of zinc oxide, which is added as an activator. We used the highly symmetrical cluster Zn(4)O(4) (T(d)) as a model species to study the thermodynamics of the initial interaction of various vulca…
Surface modification of titania nanoparticles was achieved by coating them with ultrathin alumina films using atomic layer deposition. The coating process was performed in a fluidized bed reactor at low pressure and under mechanical vibration. Films were deposited using self‐limiting, sequential surface reactions of t…
We present a systematic study of the electronic and magnetic properties of transition-metal (TM) atomic chains adsorbed on the zigzag single-wall carbon nanotubes (SWNTs). We considered the adsorption on the external and internal wall of SWNT and examined the effect of the TM coverage and geometry on the binding energ…
The preparation of large quantities of heterogeneous materials containing non‐agglomerated and monodispersed nanoparticles is becoming one of the bottlenecks that hinders the development of commercial devices. Here we describe a method to prepare monodispersed metallic (Cu, Ag, Au, Ni, Co, and Fe) nanoparticles in a s…