Materials Literature
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A novel, high Tg azobenzene-based amorphous molecular material, spiro-ADA, was designed and synthesized via a palladium catalyzed amination reaction. The introduction of bulky spiro linked bifluorene with the non-planar structure of triphenylamine of spiro-ADA prevented crystallization of the molecules and led to good…
A field emission vacuum switch using vertically aligned carbon nanotubes grown by a direct current plasma enhanced chemical vapor deposition is reported. Cathodes with optimized field emission properties were evaluated in diode configuration as a test vehicle for the construction of a vacuum power three terminal triod…
The eggshell is a highly ordered structure resulting from the deposition of calcium carbonate and an organic matrix from the acellular uterine fluid. Characterization of the individual matrix components is necessary to determine their influence upon calcite crystal shape, size, and orientation during eggshell calcific…
The microstructures of magnesium AZ31 are examined following hot compression testing and annealing. The grain size, fraction dynamically recrystallized and, in a couple of cases, the crystallographic texture are reported. The progress of dynamic recrystallization and the recrystallized grain size were sensitive to pro…
Animals carry stem cells throughout their entire life, from embryogenesis to senescence. Their function during development and adulthood consists basically of forming and sustaining functional tissues while maintaining a small self-renewing population. They reside in a complex three-dimensional environment consisting…
Abstract The influence of different confinements active during crystallization within polybutadiene‐ block ‐polyisoprene‐ block ‐poly(ethylene oxide) (PB‐ b ‐PI‐ b ‐PEO) and the corresponding hydrogenated polyethylene‐ block ‐poly(ethylene‐ alt ‐propylene)‐ block ‐poly(ethylene oxide) (PE‐ b ‐PEP‐ b ‐PEO) triblock cop…
The stability of stored NOx under air, lean propene–air mixtures and stoichiometric air–propene mixtures has been studied for Pt/Ba/Al2O3 catalysts under temperature programmed and constant λ conditions to simulate, with a simplified gas composition, the conditions experienced by a NOx storage and reduction catalyst d…
Ten mol% Sm2O3-doped CeO2 solid-solution (20SDC) powders have been synthesized via carbonate coprecipitation using ammonium hydrogen carbonate (AHC) and urea as the precipitants, respectively. Characterizations were achieved by elemental analysis, X-ray diffractometry, differential thermal analysis/thermogravimetry, a…
Molecular structure of [Cu(dtbp)2(phen)(OH2)] (dtbp-H = di-tert-butylphosphate, phen = 1,10-phenanthroline), determined at 293, 203 and 93 K, provides useful snap-shots of O-H bond activation of a metal-bound water, which is aided by an intramolecular P=O...H-O hydrogen bonding interaction.
A new membrane synthesized onto a commercial tubular support was prepared by the directed synthesis of ordered mesoporous MSU-type silica through an interfacial reaction between a silica condensation catalyst (NaF) and new hybrid micellar building units made of silica precursors and nonionic surfactants. This membrane…
Molecular dynamics simulations are performed to explore the thermal conductivity in the cross-plane direction of single-crystal thin silicon films. The silicon crystal has diamond structure, and the Stillinger-Weber potential is adopted. The inhomogeneous nonequilibrium molecular dynamics (NEMD) scheme is applied to m…
Fully biodegradable and surface-functionalized poly(D,L-lactide) (PLA) nanoparticles have been prepared by a co-precipitation technique. Novel amphiphilic random copolyesters P(CL-co-gammaXCL) were synthesized by controlled copolymerization of epsilon-caprolactone and epsilon-caprolactone substituted in the gamma-posi…
The tppz-bridged diruthenium complex [{(L)ClRuII}2(μ-tppz)](ClO4)2, [1](ClO4)2 {tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine, L = 2,2′-dipyridylamine} and its mononuclear counterpart [(L)ClRuII(tppz)]ClO4, [2](ClO4) have been synthesized. The 380 mV separation between successive RuII/RuIII couples in [1]2+ leads to a co…
In this study, the barrier properties of ultrathin Ta, TaN, and nitrogen plasma-treated Ta films were investigated by Cu/Ta(N)/Si structure. The barrier properties were evaluated by sheet resistance, film stress, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, atomic force microscopy…
In the absence of added base, a deep navy-blue dimeric copper complex [CuII(H2L)(MeCN)]2(BF4)4 (1) of the non-deprotonated bis-terdentate diamide ligand H2L self-assembles whereas in the presence of base a grass-green [2 x 2] grid complex [CuII(HL)]4(BF4)4 (2) of the monodeprotonated ligand HL-, a rare example of a di…
In this communication we report on the facile combination of hydrogen bonding and the ionic self-assembly (ISA) process to produce organized materials and fiber-containing organogel superstructures from functionalised oligoelectrolytic building blocks.
Ruthenium thin films were deposited on SiO 2 / Si substrates at 260-500°C by metallorganic chemical vapor deposition (MOCVD) using a liquid precursor (2.4-dimethylpentadienyl)(ethylcyclopentadienyl)ruthenium [Ru(DMPD)(EtCp), DMPD: 2.4-dimethylpentadienyl, EtCp: ethylcyclopentadienyl]. The deposition characteristics an…
The tower-like structure of ZnO nanocolumns grows normal to alumina substrates via pyrolysis and oxidation of ZnS, and is formed by stacking of ZnO nanocrystals layer upon layer.
Complexes between lanthanide nitrates and a pro-mesogenic 18-membered diaza-substituted coronand are luminescent both as powders and liquid crystals (between 87 and 195 degrees C), and the phase transitions are detected by monitoring luminescence intensity and lifetime.
We report on a simple methodology that facilitates the generation of surface-grafted assemblies comprising block copolymers with tunable composition and molecular weight gradients along flat solid substrates.