Materials Literature
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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…
Helically shaped multiwalled carbon nanotubes (HCNTs) (diameter 30−80 nm) were obtained as main products in large quantities by co-pyrolysis of Fe(CO) 5 as floating catalyst precursor and pyridine or toluene as carbon source at temperatures above 1000 °C under flow of hydrogen. In contrast, pyrolysis at 700−800 °C yie…
We present a formalism which enables us to express, for arbitrary d, the behaviour of the momentum-distribution function n_{sigma}(k) pertaining to uniform metallic ground states of the single-band Hubbard Hamiltonian H close to S_{F;sigma} (the Fermi surface of the fermions with spin index sigma, sigma = uparrow,down…
Various types of inorganic substances doped with silver ions have been developed as antibacterial materials, and some have already been commercialized. Colorless and chemically durable materials that slowly release silver ions are, however, still need to be developed. The present authors have previously shown that whe…
We present a multiscale simulation of a crack in silicon under tensile loading that is consistent with experiment; fracture is brittle with a modest lattice-trapping energy barrier to crack propagation. Our multiscale molecular-dynamics simulation has a tight-binding description of bonding near the crack tip embedded…
We propose and analyze theoretically a resonant acousto-optic Stark effect for microcavity (MC) polaritons parametrically driven by a surface acoustic wave. For GaAs-based microcavities our scheme ``acoustic pumping - optical probing'' deals with surface acoustic waves of frequency $ν_{\rm SAW} \simeq 0.5 - 3$ GHz and…
The lineshape of crystal-field transitions in single crystals of Mn12ac molecular magnets is determined by the magnetic history. The absorption lines are symmetric and Gaussian for the non-magnetized state obtained by zero-field cooling (zfc). In the magnetized state which is reached when the sample is cooled in a mag…
We report first-principles calculations of the energetics and simulated scanning tunneling microscopy (STM) images for Mn dopants near the GaAs (110) surface, and compare the results with cross-sectional STM images. The Mn configurations considered here include substitutionals, interstitials, and complexes of substitu…
We have derived the integral form of the cusp and node coalescence conditions satisfied by the wavefunction at the coalescence of two charged particles in $D \geq 2$ dimension space. From it we have obtained the differential form of the coalescence conditions. These expressions reduce to the well-known integral and di…
In this paper I study a model for a growing surface in the presence of anomalous diffusion, also known as the Fractal Kardar-Parisi-Zhang equation (FKPZ). This equation includes a fractional Laplacian that accounts for the possibility that surface transport is caused by a hopping mechanism of a Levy flight. I show tha…
Exfoliated nanocomposites (PE-g-MA/MgAl-LDH) were synthesized by solution intercalation of polyethylene-grafted-maleic anhydride (PE-g-MA) into the galleries of organo-modified MgAl layered double hydroxide (OMgAl-LDH) under reflux in xylene. Their structural elucidation and thermal characterization were carried out b…
This review focuses on the electrosynthesis, in situ characterization, and technological applications of Prussian blue analogues with the generic formula A h M k [Fe(CN) 6 ] l · m H 2 O, where h, k, l, and m are stoichiometric numbers, A = alkali metal cation, and M is a transition metal. Six such metal hexacyanoferra…
Integrin-mediated cell adhesion to proteins adsorbed onto synthetic surfaces anchors cells and triggers signals that direct cell function. In the case of fibronectin (Fn), adsorption onto substrates of varying properties alters its conformation/structure and its ability to support cell adhesion. In the present study,…
Electrospinning has been applied to prepare uniaxially aligned nanofibers made of organic polymers, ceramics, and polymer/ceramic composites. The key to the success of this method was the use of a collector consisting of two pieces of electrically conductive substrates separated by a gap whose width could be varied fr…