Materials Literature
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A systematic density functional study of the adsorption and dissociation of O 2 on the (001) surface of several transition metal carbides (TCMs; TM = Ti, Zr, Hf, V, Nb, Ta, Mo) is presented. It is found that O 2 may adsorb molecularly on two different sites with similar adsorption energy. At these sites, either O 2 br…
Abstract A series of wholly aromatic PIs were prepared from a newly synthesized sulfur‐containing diamine and various aromatic dianhydrides via a two‐step polycondensation procedure. Flexible and tough PI films were cast from their soluble PAA precursors. The PIs showed good thermal stability with 5% weight loss tempe…
We show in the case of a high-Peierls-stress Lomer dislocation in an aluminum crystal that the dependence of the kink-pair activation enthalpy on the stress obtained from static nudged elastic band method calculations agrees with that extracted from dynamical, constant strain-rate simulations. In order to perform the…
A resonance condition has been obtained for the position of plasmon peaks of any multipole order in the extinction spectra of silver and gold nanorods, as a function of their material, size, shape, and dielectric environment. The expression has been derived combining electrodynamics simulations with the aid of a nanoa…
The frequency-dependent dielectric relaxation of calcium-iron-antimonate $[\mathrm{Ca}({\mathrm{Fe}}_{1∕2}{\mathrm{Sb}}_{1∕2}){\mathrm{O}}_{3}]$ (CFS) ceramic, synthesized by a solid-state reaction technique is investigated in the temperature range from $143\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex…
Phonon-induced dephasing of electronic transitions in semiconducting single-wall carbon nanotubes (CNT) is investigated by ab initio molecular dynamics. Pure-dephasing is shown to be the source of the photoluminescence linewidths observed experimentally in isolated CNTs at low and room temperatures. In ideal tubes, th…
Two unique materials based on Mn4 single-molecule magnet (SMM) clusters (ST=9) and integer or non-integer average valent platinum maleonitriledithiolate (mnt2-) complexes, [{MnII2MnIII2(hmp)6(MeCN)2}{Pt(mnt)2}2][Pt(mnt)2]2.2MeCN (1) and [{MnII2MnIII2(hmp)6(MeCN)2}{Pt(mnt)2}4][Pt(mnt)2]2 (2), were synthesized by the ma…
We demonstrated a novel approach to produce robust bicontinuous nanoporous polymer membranes by ring-opening metathesis polymerization of a new norbornene-functional diblock copolymer and dicyclopentadiene followed by selective removal of a chemically etchable polylactide block. Polymerization-induced phase separation…
The self-ordering behavior of anodic aluminum oxide (AAO) has been investigated for anodization of aluminum in malonic acid (H 4 C 3 O 4 ) solution. In the present study it is found that a porous oxide layer formed on the surface of aluminum can effectively suppress catastrophic local events (such as breakdown of the…
Abstract The synthesis of a new cyclic carbonate monomer containing an allyl group was reported and its biodegradable amphiphilic block copolymer, poly(ethylene glycol)‐ block ‐poly( L ‐lactide‐ co ‐5‐methyl‐5‐allyloxycarbonyl‐propylene carbonate) [PEG‐ b ‐P(LA‐ co ‐MAC)] was synthesized by ring‐opening polymerization…
We report here the synthesis and self-assembly of a series of asymmetric dumbbell-shaped rod amphiphiles containing hydrophilic oligoether dendrons at one end and hydrophobic alkyl dendrons at the other end of the stiff rod segment with systematic variation in the length of the hydrophobic alkyl chain ranging from eth…
Volatilization of Sb during the fabrication of CoSb3 by mechanical alloying and then spark plasma sintering has been successfully compensated by adding excess Sb. The average grain size increases apparently with excess Sb content, abnormally grown by about 100 times as the excess Sb is up to 4 at.%. A liquid-phase-rel…
We present an instrument for performing correlation spectroscopy on single fluorescent particles while tracking their Brownian motion in three dimensions using real-time feedback. By tracking CdSe/ZnS quantum dots in water (diffusion coefficient approximately 20 microm2/s), we make the first measurements of photon ant…
The full three dimensional dispersion of the pi-bands, Fermi velocities and effective masses are measured with angle resolved photoemission spectroscopy and compared to first-principles calculations. The band structure by density-functional theory strongly underestimates the slope of the bands and the trigonal warping…
The nature of the cooperative Jahn-Teller (JT) transition accompanied by orbital order-disorder in Nd1-xCaxMnO3 has been studied by high temperature (300 - 1200K) synchrotron and laboratory X-ray powder diffraction in the low doping region (0
Nitrogen embedded ZnO : N films prepared by pulsed laser deposition exhibit significant ferromagnetism. The presence of nitrogen ions contained in ZnO is confirmed by the secondary ion microscopic spectrum and by Raman experiments, and the embedded nitrogen ions can be regarded as defects. According to the experimenta…
A qualitative and rapid measurement technique based on multiple light scattering was employed to analyze the dispersion stability of black multiwalled carbon nanotube (CNT) suspensions. Pristine and chemically oxidized CNTs were dispersed in various polar and nonpolar solvents. The change in the transmission of near-i…
In order to elucidate the nature of ferromagnetic signatures observed in (Zn,Co)O, we have examined experimentally and theoretically magnetic properties and spin-dependent quantum localization effects that control low-temperature magnetoresistance. Our findings, together with a through structural characterization, sub…
A dual functional lithium–lead (DFLL) test blanket module (TBM) concept has been proposed for testing in the International Thermonuclear Experimental Reactor (ITER) and the Experimental Advanced Superconducting Tokamak (EAST) in China to demonstrate the technologies of the liquid lithium–lead breeder blankets with emp…
This paper presents an experimental study of the fretting crack nucleation threshold, expressed in terms of loading conditions, with a cylinder/plane contact. The studied material is a damage tolerant aluminium alloy widely used in the aerospace application. Since in industrial problems, the surface quality is often v…