Materials Literature
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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…
Asymmetrically functionalized single-wall carbon nanotubes (SWNTs) have been prepared by a covalent reaction of an 11-mercaptoundecanol-modified Au surface with oxidized SWNT cylinders. While one end of the tubes is attached to gold substrate via ester groups, the free carboxylic substituents on the other end can be e…
Spider silk proteins are well-known for their extraordinary mechanical properties, displaying remarkable strength and toughness. In this study, matrix-assisted laser desorption ionization (MALDI) tandem time-of-flight (TOF) mass spectrometry (MS/MS) and reverse genetics were used to isolate a new cDNA sequence that en…
We report the investigation of a prototype cooperative photoinduced spin transition in $[\mathrm{Fe}(\mathrm{PM}\text{\ensuremath{-}}\mathrm{BiA}{)}_{2}(\mathrm{NCS}{)}_{2}]$ by x-ray diffraction. The structural rearrangement accompanying the change of an electronic state between the low spin and the photoinduced out-…
In this paper, a parameter identification procedure for a recently proposed hysteretic brushless exciter model is discussed. The model features average-value representation of all rectification modes, and incorporation of magnetic hysteresis in the d-axis main flux path using Preisach's theory. Herein, a method for ob…
Clusters containing nine lanthanide and six sodium ions are crystallized with the help of a tridentate ligand bearing a phosphonic acid group; the structure of the Eu(III) compound reveals a host-guest assembly Eu [symbol: see text] Na6Eu8L16 with a substantial quantum yield (32%). A similar Eu(III)-Yb(III) structure…
In this work, we developed a convenient and efficient method for solubilization, purification and functionalization of carbon nanotubes (CNTs) using a versatile reagent (phosphotungstic acid (HPW)). Because HPW can spontaneously attach to graphite walls as polyanions and provide static repulsion, CNT aggregates were d…
[Ru(II)(F(20)-tpp)(CO)] (1, F(20)-tpp=meso-tetrakis(pentafluorophenyl)porphyrinato dianion) was covalently attached to poly(ethylene glycol) (PEG) through the reaction of 1 with PEG and sodium hydride in DMF. The water-soluble PEG-supported ruthenium porphyrin (PEG-1) is an efficient catalyst for 2,6-Cl(2)pyNO oxidati…