Materials Literature
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Abstract Dithia‐(dithienylethena)phane derivatives, composed of dithienylethene moieties and benzene bridges, were synthesized by a coupling reaction of the corresponding bis(chloromethyl)benzene with bis(mercaptomethyl)dithienylethene under high‐dilution conditions. The products exhibit photochromic properties upon i…
The effects of lanthanide co‐dopants on oxygen diffusion in yttria‐stabilized zirconia (YSZ) are studied using a combined first principles density functional theory (DFT)/kinetic Monte Carlo (kMC) modeling approach. DFT methods are used to calculate barrier energies for oxygen migration in different local cation envir…
An ultra‐thin Ni‐based metal used as the electrode layer in multilayer ceramic capacitor determines the dielectric performance of the capacitor. The warpage and the continuity of the inner electrode layers, and a dihedral angle between BaTiO 3 layers and metal electrodes of two ceramic capacitors (X7R and X5R) were ch…
Grain‐boundary (GB) segregation has been measured in Nb‐doped TiO 2 (rutile) by Auger electron spectroscopy analyses of the two surfaces exposed by inter‐granular fracture. In addition, the orientations of the exposed GB planes on both sides of the fracture surface have been determined. A strong anisotropy of GB compo…
We investigated optical excitations of transition-metal (TM) oxides with metal oxygen octahedra taking account of the orbital multiplicity effects. We predicted excitation energies of intersite d–d transitions and p–d transitions of TM oxides. We compared the evaluated excitation energies with reported experimental da…
Abstract A simple synthetic route for the efficient preparation and purification of two regioisomers of a pyrene derivative containing two ethynyl groups―1,6‐ and 1,8‐bis(ethynyl)pyrene―is described. The former compound was used as a building block for the stepwise synthesis of a highly conjugated, ditopic bis(2,2'‐bi…
Lanthanum‐doped ceria powder with a composition Ce 0.8 La 0.2 O 1.9 was prepared by heating the oxalate solid solution (Ce 0.8 La 0.2 ) 2 (C 2 O 4 ) 3 at 873 K in air. As‐prepared powder was densified to 96%–97% relative density by sintering in air at 1773 K for 4 h. The electronic current of the disk sample was measu…
Abstract The effects of dough aeration on measured bulk rheology of dough were investigated by preparing doughs with various gas contents and assessing their rheology under large deformation biaxial extension using the SMS Dough Inflation System. Doughs were mixed to various gas contents using a laboratory‐scale mixer…
A method for synthesis of high aspect ratio platelet seeds by growth of SrTiO 3 on Sr 3 Ti 2 O 7 core particles is reported. The aim of this study was to identify and control the morphology and size of SrTiO 3 particles via molten salt synthesis. Platelet and tabular morphologies with rectangular faces were obtained u…
Direct observation of the entropy change in a first-order phase transition is obtained by using a differential scanning calorimeter in which the transition is field-induced under the application of an external magnetic field. This procedure enables direct evaluation of the magnetocaloric effect in materials showing fi…
Temperature dependence of lattice parameters of bismuth sesquioxide (Bi 2 O 3 ) has been obtained between 26° and 778°C by the Rietveld method using neutron powder diffraction data. Lattice parameters and unit‐cell volume of α and δ phases increased, while the β angle of α phase decreased with an increase of temperatu…
The use of alternative blowing agents for the production of polyisocyanurate (PIR) rigid foam has created a need to better understand how various catalysts participate in isocyanurate formation. The improvement of isocyanate conversion to isocyanurate is one approach to overcome the greater flammability inherent with…
La‐doped 0.3Pb(Zn 1/3 Nb 2/3 )O 3 –0.7Pb(Zr x Ti 1− x )O 3 ( x =0.5–0.53) piezoelectric ceramics with pure perovskite phase were synthesized by a two‐step hot‐pressing route. The piezoelectric properties of various compositions near the morphotropic phase boundary (MPB) were systematically investigated. Not only was t…
The role of moisture in affecting both intrinsic and extrinsic aspects of the fracture and fatigue‐crack growth resistance of a polycrystalline alumina (99.5% pure, 25 μm grain size) has been examined in both moist and dry environments at ambient temperature. The intrinsic (crack‐tip) toughness, deduced from measured…
In this work, Mudar fibers (Calotropis procera) have been characterized for their physical, chemical, and tensile properties. Mudar fibers have good length, strength, uniformity, fineness, and excellent moisture absorption. The study highlights the difficulties in spinning 100% Mudar yarn. Subsequently, a 75/25 Mudar/…
Partially wetting drops sliding down an inclined plane develop a “corner singularity” at the rear, consisting of two dynamic contact lines that intersect. We analyze the three-dimensional flow in the vicinity of this singularity by exploring similarity solutions of the lubrication equations. These predict a self-simil…
We have studied, for the first time, the effect of the content of intergranular phase and grain size on the sliding‐wear resistance of pressureless, liquid‐phase‐sintered (LPS) α‐SiC (silicon carbide) ceramics. It was found that the sliding‐wear behavior of these ceramics is similar to what is observed in other polycr…
In this paper, we present sintering and uniaxial viscosity data of three commercial low‐temperature co‐sintered ceramic systems, i.e., DuPont 951Tape (DU), Heraeus CT2000 (CT), and Ferro A6M (FE), measured by cyclic loading dilatometry. The viscosity initially decreases with temperature, changes little during the inte…
Connecting rods: Rigid rod–rod block copolymers are synthesized from peptide and polyisocyanide blocks (see picture: blue=poly(γ-benzyl L-glutamate); red=poly(methylbenzyl isocyanide) or poly(L-isocyanoalanyl-L-alanine methyl ester). The polyisocyanide helix has side arms organized in a parallel β-sheet (light blue).…
Formation of titanium silicon carbide (Ti 3 SiC 2 ) by mechanical alloying (MA) of Ti, Si, and C powders at room temperature was experimentally investigated. A large amount of granules less than 5 mm in size, consisting of Ti 3 SiC 2 , smaller TiC particles, and other silicides, have been obtained after ball milling f…