Materials Literature
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Abstract Time‐resolved real‐space observations of morphology and pattern formation resulting from crystallization of ultrathin films of low‐molecular‐weight poly(ethylene oxide) (PEO) or diblock copolymers containing PEO shed light on the mechanisms of how polymer crystals are formed. We used simple but restricted geo…
The thermodynamic stabilities of the Gd(III) complexes of five hexadentate ligands, which incorporate the 2,3-dihydroxyterephthalamide and 2,3-hydroxypyridonate chelating moieties, have been determined by potentiometric and spectrophotometric titration. The ligands were chosen to span a range of basicities while maint…
We use molecular dynamics as a tool to understand the structure and phase transitions [Osman, M. A.; et al. J. Phys. Chem. B 2000, 104, 4433-4439. Osman, M. A.; et al. J. Phys. Chem. B 2002, 106, 653-662] in alkylammonium micas. The consistent force field 91 is extended for accurate simulation of mica and related mine…
We study the effect of semicore states on the self-energy corrections and electronic energy gaps of silicon, germanium and GaAs. Self-energy effects are computed within the GW approach, and electronic states are expanded in a plane-wave basis. For these materials, we generate {\it ab initio} pseudopotentials treating…
Angle-resolved photoemission (PE) was used to characterize the spin-density wave (SDW) state in thin films of Cr grown on W(110). The PE data were analysed using results of local spin density approximation layer-Korringa-Kohn-Rostoker calculations. It is shown that the incommensurate SDW can be monitored and important…
Magnetoelectric (ME) interactions in layered structures of magnetostrictive and piezoelectric phases are mediated by mechanical deformation. Here we discuss the frequency dependence of ME coupling in bilayers and trilayers of Permendur, a ferromagnetic alloy, and lead zirconate titanate. Data on ME voltage coefficient…
We measured polarization-dependent photoluminescence-excitation spectra of highly uniform T-shaped quantum wires at 5 K. We attribute one peak to the 1D-exciton ground state and the continuous absorption band to 1D continuum states. These had similar polarization-dependences. We also observed some other peaks above th…
We report direct observation of long-term durability of superconductivity of several YBa$_2$Cu$_3$O$_7$-Ag$_2$O composites that were first prepared and studied almost 14 years ago [J. J. Lin {\it et al}., Jpn. J. Appl. Phys. {\bf 29}, 497 (1990)]. Remeasurements performed recently on both resistances and magnetization…
The large, so-called colossal magnetoresistivity of doped ${\mathrm{LaMnO}}_{3}$ has attracted considerable attention, but is only one unusual feature of the ferromagnetic transition in these compounds. We examine in this paper the progression of magnetic and thermodynamic behavior as the transition temperature is mad…
We report on the preparation and characterization of gold nanoparticle (Au NP )-based core−shell particles and hollow spheres and of ordered structures obtained from their self-assembly. Coated particles, comprising polystyrene (PS) cores and polyelectrolyte (PE) or Au NP /PE shells, were prepared by the layer-by-laye…
A new type of cyano-bridged Co-W bimetallic assembly, CsI[{CoII(3-cyanopyridine)2}{WV(CN)8}].H2O was synthesized. This compound exhibited a temperature-induced phase transition and a photoinduced magnetization. Irradiating with light induced a spontaneous magnetization with a magnetic phase transition temperature at 3…
A simple and scalable scheme based on alternating current (ac-) dielectrophoresis is used for the simultaneous and site-selective deposition of single bundles of single-walled carbon nanotubes (SWNTs) onto a large number of contacts requiring only one bond wire. This allows for a large number of transport measurements…
An open-ended hollow tubular structure is designed based on hydrogen-bond-directed self-assembly of a chimeric cyclic peptide subunit comprised of alternating alpha- and epsilon-amino acids. The design features a novel 1,4-disubstituted-1,2,3-triazole epsilon-amino acid and its utility as a peptide backbone substitute…
Well-aligned single-crystalline wurzite zinc oxide (ZnO) nanowire array was successfully fabricated on an Al 2 O 3 substrate by a simple physical vapor-deposition method at a low temperature of 450 °C. The diameter and growth rate of ZnO nanowires increased as a function of growth temperature. TEM observation showed t…
Polypropylene (PP) composites containing nanosized (φ ∼ 10 nm) spherical silica particles were prepared in situ utilizing a 1-L slurry-phase polymerization reactor containing a MgCl 2 -supported Ziegler−Natta (fourth-generation) catalyst. Composites were prepared with variable filler sizes ranging from the nano- to mi…
The interaction between Pt electrodes and ferroelectrics in ${\mathrm{P}\mathrm{t}/\mathrm{B}\mathrm{i}}_{4}{\mathrm{Ti}}_{3}{\mathrm{O}}_{12}(\mathrm{BTO})/\mathrm{Pt}$ and ${\mathrm{P}\mathrm{t}/\mathrm{B}\mathrm{i}}_{3.25}{\mathrm{La}}_{0.75}{\mathrm{Ti}}_{3}{\mathrm{O}}_{12}(\mathrm{BLT})/\mathrm{Pt}$ capacitors w…
The dyad sequence analysis of Technora (copolyamide prepared from terephthaloyl chloride, p -phenylenediamine, and 3,4‘-diaminodiphenyl ether) was reported using 13 C NMR in trifluoromethanesulfonic acid at 100 °C. For the detailed peak assignment, some model copolymers were synthesized and the 13 C NMR spectra were o…
Direct atomistic simulations of dislocation multiplication in fcc aluminum reveal an unexpected mechanism, in which a Frank-Read source emits dislocations with Burgers vectors different from that of the source itself. The mechanism is traced to a spontaneous nucleation of partial dislocation loops within the stacking…
Targeted solid-state synthesis of supramolecular porphyrin networks with palladium- and platinum-tetra(4-carboxyphenyl)porphyrins as building blocks, in different reaction environments, afforded a series of new extended coordination polymers sustained by sodium, potassium, and copper metal ion cluster auxiliaries. For…
The fluorescence of polyphenylene dendrimers and the intramolecular energy transfer in polyphenylene dendrimers containing a perylenediimide core have been investigated in this paper. Polyphenylene dendrimers composed of tens or hundreds of out-of-plane twisted phenyl units exhibit strong fluorescence, with quantum yi…