Materials Literature
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A lightweight in-plane-switching liquid crystal display (IPS-LCD) using a single glass substrate and an anisotropic polymeric film is demonstrated. The liquid crystal molecules are aligned by the elongated polymer grain of the film. The alignment capability of the anisotropic film is comparable to a buffed polyimide l…
A first-principles calculation of the structure of barium under pressure was done with a procedure which finds the equilibrium structure by minimizing the Gibbs free energy at zero temperature with respect to structure at each pressure. The calculated structures agree with measurements at the 1% level in three phases,…
To estimate the importance of relativistic effects on the reaction mechanisms between Ru and CO2, the potential energy surfaces have been performed in the triplet and quintet electronic states using quasi-relativistic (Pauli), zero-order regularly approximated (ZORA), and nonrelativistic (NR) density functional theory…
Samples of rutile TiO2 have been prepared by sintering compacted powders under argon flow. Long (above 20 h) sintering times at 1500 °C led to the formation of rods with squared cross-sections in a broad range of sizes. A two-step annealing treatment, at two temperatures, was found to favour the growth of low-dimensio…
Abstract Soluble, fluorescent, terpyridine‐substituted, conjugated polymers were prepared and characterized. The polymer chains included a defined oligo(phenylenevinylene) fragment, on which the terpyridine‐functional group was attached. The polymers were blue‐fluorescent with emission peaks at 400–427 nm in tetrahydr…
Abstract Three novel trinuclear cobalt( II ) compounds of pyridazine,[Co 3 (μ‐OH) 2 (μ‐pdz) 4 (pdz) 2 (NO 3 ) 2 (H 2 O) 2 ] · (NO 3 ) 2 · (THF) · 2(MeOH) ( 1 ), [Co 3 (μ‐OH) 2 (μ‐pdz) 4 (pdz) 4 (NO 3 ) 2 ] · [Co 3 (μ‐OH) 2 (μ‐pdz) 4 (MeOH) 4 (NO 3 ) 2 ] · (NO 3 ) 4 ( 2 ), and [Co 3 (μ‐pdz) 4 (μ‐NCS) 2 (pdz) 2 (NCS) 4…
The secondary electron emission (SEE) of ZnO-coated carbon nanotubes (CNTs) was measured using a biasing technique in a scanning electron microscope. The SEE yield of the ZnO-coated CNTs is higher than that of the ZnO film deposited on Si substrates. Direct observation of the variation in SEE from tip-end and non-CNT…
Motivated by the observation that the spontaneous polarization process of a ferroelectric polycrystal under the influence of a superimposed stress and/or electric field involves heterogeneous evolution of the ferroelectric phase among its constituent grains, a self-consistent electromechanical model is developed to de…
Abstract New cationic organoiron( II ) pyranylideneacetaldehyde hydrazone complexes were prepared in high yields through condensation reactions of the organometallic hydrazine precursor [CpFe(η 6 ‐ p ‐MeC 6 H 4 NHNH 2 )] + PF 6 – with differently substituted α‐ and γ‐pyranylideneacetaldehydes. The mononuclear hydrazon…
Uranium is the only known element that features a charge-density wave (CDW) and superconductivity. We report a comparison of the specific heat of single-crystal and polycrystalline alpha-uranium. In the single crystal we find excess contributions to the heat capacity at 41 K, 38 K, and 23 K, with a Debye temperature T…
The self-assembly of chiral depsipeptide dendrons 4, which contain a cyanuric acid building block at their focal point, with the homotritopic Hamilton receptor 1 is reported. The 1:3 compositions of the resulting chiral supramolecular dendrimers, the association constants K(n), and the cooperativity of binding express…
Boron compounds that are produced from boron ores are important industrial materials. In this report, an alternative method for the formation of boric acid obtained via the reaction between colemanite and sulfuric acid in aqueous media was studied. For this purpose, the kinetics and mechanism of the dissolution of col…
The Saccharomyces cerevisiae high-mobility group protein HMO1 is composed of two DNA-binding domains termed box A and box B, of which only box B is predicted to adopt a HMG fold, and a lysine-rich C-terminal extension. To assess the interaction between individual domains and their contribution to DNA binding, several…
We studied the propagation of partial discharge pulses in a stator winding by means of measurements on a dismantled 35-MW generator and found that a stator winding acts as a transmission line. Therefore, a partial-discharge (PD) signal manifests itself at the generator terminals after a transit time that depends on th…
Ion mobility and molecular modeling methods were used to examine the gas-phase conformational properties of POSS (polyhedral oligomeric silsesquioxanes) siloxane oligomers. MALDI generated the sodiated dimers (Cy 7 T 8 ) 2 O·Na + and (Cp 7 T 8 ) 2 O·Na + and the trimer ion [Cy 7 T 8 O−Cy 8 Si 8 O 11 −OCy 7 T 8 ] Na +…
We study analytically the structural properties of a system with a short-range attraction and a competing long-range screened repulsion. This model contains the essential features of the effective interaction potential among charged colloids in polymeric solutions and provides novel insights on the equilibrium phase d…
Tm2+ doped in CsCaI3 displays unusual optical properties that are characterized by the existence of two metastable 4f-5d excited states in the near-infrared and visible spectral region, respectively. For the first time, a photon upconversion process based on sequential absorption of light by 4f-5d states is reported.…
This paper describes the mechanisms of formation and ordering of Ge nanocrystals on a pre-patterned silica layer. In the first part, we investigate the nucleation and growth of Ge nanocrystals during thermal annealing of an amorphous Ge layer. In particular, morphological evolution of nanocrystals with different exper…
Supermolecular assembly techniques combined with the cation exchange of nanoparticles transforms mesostructured CdS into mesostructured CuS (see figure). The resulting materials retain the overall integrity of the original mesostructured material after the cation-exchange process.
Cooperativity is a general feature of intermolecular interactions in biomolecular systems, but there are many different facets of the phenomenon that are not well understood. Positive cooperativity stabilizes a system as progressively more interactions are added, and the origin of the beneficial free energy may be ent…