Materials Literature
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A homogeneous series of chiral trimeric compounds, possessing three biphenyl mesogenic cores connected by flexible alkyl spacers, were prepared and the liquid-crystalline properties investigated. The trimers were designed to have chiral moieties at both peripheral ends of the molecular structure and the properties wer…
The interlaminar fracture toughness of a plain-weave carbon-epoxy composite was studied under Mode I, Mode II and Mixed-Mode I and II loading. The objective was to compare results for a composite material with two different fiber forms: unidirectional tape and plain-weave fabric (PW). Tests were performed using the do…
Substitution of the bromine ligands in [(n-Bu)4N]2[Mo3S7Br6] (1) by bidentate ligands such as maleonitriledithiolate (mnt) or oxalate (ox) affords the trinuclear clusters [Mo3S7(mnt)3]2− ([2]2−) and [Mo3S7(ox)3]2− ([3]2−) in moderate yields. The structures of clusters [2]2− and [3]2− have been determined by single-cry…
The molecular dynamics of the degradation process of poly(lactic-co-glycolic acid) nanospheres were investigated during the degradation process usually observed when these polymers are used as controlled release carriers. The molecular weight distribution of PLGA samples was determined over a period of 32 days by accu…
Molecular clusters [Mn12O12(RCOO)16(H2O)n] (R = CH3, C6H5 (n = 4) and C2H5 (n = 3)) and [Mn4(CH3COO)2(pdmH)6] (pdmH = 2,6-bis (hydroxymethyl)pyridine) presenting Single Molecule Magnetic (SMM) behaviour were inserted into hexagonal mesoporous silica with pore size in the 25–100 Å range. An optimum host pore size exist…
The structural features that affect continuity of ultrathin diffusion barriers on porous low-dielectric-constant ( k ) thin films has been investigated. The dimensions of interconnected nanopores in a series of Dow Corning XLK films are found to increase as the dielectric constant becomes smaller. The minimum thicknes…
Poly-organo-siloxane spherical particles were synthesized by a sol–gel method from methyltrimethoxysilane (MTMS) using a W/O emulsion comprising of sorbitantrioleate (SPAN85), n-octane, and H2O. MTMS was hydrolyzed and condensed without acid and/or basic catalysts in this W/O emulsion at room temperature. The size of…
This paper presents a numerical investigation of hydrogen storage in a metal hydrid bed. For this purpose, a two-dimensional mathematical model which considers complex heat and mass transfer and fluid flow during the hydriding process is accomplished in this study. The coupled differential equations are solved with nu…
The uptake of benzoate anions from aqueous solutions by calcined and uncalcined layered double hydroxides (LDHs) is reported. Adsorption (or sorption) isotherms have been determined at 25°C in the 0 to 100 mmol dm m 3 concentration range. The results showed that the calcined LDH sorbs 40 to 85% of the benzoate in solu…
Plasma-enhanced chemical vapor deposition (PECVD) of zinc oxide was accomplished using diethyl zinc, oxygen, and argon in a capacitively coupled reactor. The plasma chemistry was studied by optical emission spectroscopy (OES) with particular focus on the effects of reactant composition and rf power. Process-property r…
Haemin, iron(III)-protoporphyrin IX complex, and parallel-quadruplexed d(TTAGGG) have been shown to form a stable coordination complex which exhibits spectroscopic properties remarkably similar to those of haemoproteins.
Manganese N-confused porphyrins activate C-C and C-H bonds upon heating or air oxidation; the dimer complex [Mn(NCTPP)]2 is reduced at two meso positions, and the pyridine coordinated monomer breaks the internal C-H bond upon heating or exposure to oxygen.
We report simulations demonstrating subwavelength focusing of electromagnetic waves, from one homogeneous and isotropic dielectric to another, through a flat lens made of a realizable negative-refractive-index (NRI) metamaterial. The NRI metamaterial consists of a two-dimensional inductor/capacitor (L/C) loaded transm…
The mechanism behind superconformal filling of fine features during surfactant catalyzed chemical vapor deposition (CVD) is described and the metrology required to predict it is identified and quantified. The impact of adsorbed iodine coverage on copper deposition rate during chemical vapor deposition of copper on pla…
The isolation and structural elucidation by single crystal X-ray diffraction of triclinic and monoclinic modifications of an inclusion complex of beta-cyclodextrin with the same guest, methylparaben, are reported.
The first preparation of an Fe(II) spin-crossover complex including a 1,3-dithiole ligand is reported. Crystal analyses of both the low- and the high-temperature phases reveal that short S...S contacts play a key role in an abrupt spin transition.
Abstract The rheological and mechanical properties of a polystyrene‐polyisobutylene‐polystyrene (SIBS) block copolymer containing 30 wt% polystyrene (PS) and its blends with PS (SIBS/PS) were investigated. Atomic Force Microscopy (AFM) was used to visualize the nanostructured phase morphology of the SIBS, which is res…
Long-term water exposure may degrade polymer-matrix composites. This study investigated the water-aging of whisker composites. It was hypothesized that whiskers would provide stable and substantial reinforcement, and that whisker type would affect water-aging resistance. Silica-fused Si(3)N(4) and SiC whiskers were in…
We report unprecedentedly high electrocatalytic activity of electropolymerized films of poly(3,4-ethylenedioxythiophene) (PEDOT) toward the redox reactions of 2,5-dimercapto-1,3,4-thiadiazole (DMcT) which is a promising cathode material for high-energy Li-ion batteries. The irreversible redox reaction of DMcT monomer…
The electrochemical behavior of vanadium(II) was examined in the 66.7-33.3 mole percent aluminum chloride-1-ethyl-3-methylimidazolium chloride molten salt containing dissolved VCl2 at 353 K. Voltammetry experiments revealed that V(II) could be electrochemically oxidized to V(III) and V(IV). However at slow scan rates…