Materials Literature
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The electronic conduction mechanism through the electrochemically formed passive film on an iron polycrystalline surface was studied by in situ electrochemical scanning tunneling microscopy (EC-STM) and electrochemical impedance spectroscopy (EIS). In situ STM imaging conditions of the iron oxide layer in the differen…
Initial Stages of Structure Formation on Silicon Electrodes Investigated by Photoelectron Spectroscopy Using Synchrotron Radiation and In Situ Atomic Force Microscopy , Lewerenz, H. J., Aggour, M., Murrell, C., Kanis, M., Jungblut, H., Jakubowicz, J., Cox, P. A., Campbell, S. A., Hoffmann, P., Schmeisser, D.
A novel synthetic control method for the generation of carbon replicas successfully produces either highly ordered networks of carbon nanofibers with uniform mesopores or disordered carbon nanofibers.
A terminally protected acyclic tetrapeptide Boc-Aib-Val-Aib-beta-Ala-OMe 1 (Aib: alpha-aminoisobutyric acid, beta-Ala: beta-Alanine) self-assembles into a continuous hydrogen-bonded supramolecular helix with an average diameter of 10 A (1 nm) starting from a double bend molecular conformation in crystals and further s…
We conducted static tensile tests below room temperature for ultrafine-grained ferrite-cementite (FC) steels with ferrite grain sizes between 0.47 and 1.5 μm. The change in flow stress (σ) for the FC steels as a function of ferrite grain size (D) follows the Hall-Petch equation: σ= σ0+kD-1/2, where σ0 and k are consta…
A novel rolling process characterized by multi-pass bi-axial reduction at warm temperatures without a fairly large reduction per pass was pro-posed to obtain ultrafine-grained ferrite structures for steel plates. The process was applied to 0.15%C-0.3%Si-1.5%Mn steel. Steel plates with a thickness of 18 mm, a width of…
In order to achieve same level of high strength and high ductility as 6061 aluminum forging alloy that is currently used for automobile applications, AZ31 magnesium alloy rod with a large diameter of 40 mm was subjected to ECAE-processing, and the microstructures and mechanical properties of the ECAE-processed specime…
Low-temperature absorption and luminescence spectra of three crystalline nitronyl nitroxides are presented. For 2-(2-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide and 2-(2-benzimidazolyl)-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide, luminescence with resolved vibronic structure is observed between 700 nm an…
Filling deep trench-like features by electrodeposition is often limited by ion transport from the electrolyte bath to the plating surface at the feature bottom. This transport may be substantially enhanced by buoyancy-driven convection induced by metal-ion depletion adjacent to the plating surface. Numerical solutions…
This paper presents an analysis of the role of orientation on the rheology of discotic nematic liquid crystals. The shear rheological properties exhibited by flow-aligning discotic mesophases are calculated by using a complete generalized nonlinear second-order tensor Landau-de Gennes model that takes into account sho…
Nitrogen-doped carbon nanotubular fibers with a very high nitrogen concentration (approximately 20 at.%) were synthesized through the aerosol-assisted decomposition of dimethylformamide in the presence of catalyst. The synthesized fibers process a novel "pearl necklace-like" morphology and exhibit an excellent field e…
The National Energy Technology Laboratory (NETL) has developed a solid oxide fuel cell (SOFC) model based on commercial computational fluid dynamics (CFD) software. This new tool is being used to support the US DOE Solid State Energy Conversion Alliance Fuel Cell Program, which will require advanced fuel cell designs…
Oxide films form readily when aluminum alloy castings are melted and/or poured. They could be primary or secondary types of oxide films. The former type is inherited from the ingot and has existed in aluminum alloy casting for a long period of time. During the filling of the mold cavity, the free unstable surface of t…
Niigataite, CaSrAl3(Si2O7)(SiO4)O(OH), is a new member of the epidote group. It is monoclinic, P21/m, a=8.890(4), b = 5, 5878(18), c = 10.211(4) Å, b = 115.12(3)°, V = 459.3(3)Å3 and Z = 2. The 8 strongest X-ray powder diffractions are dobs(Å)(I/I0)(hkl): 2.90(100)(113), 2.79(48)(020), 2.70(26)(013), 3.22(25)(201), 2.…
The paper presents the X-ray photoelectron spectra (XPS) of the valence band and core levels of the ferroelectric SbSI single crystal. Results revealed the new phenomenon--splitting of the core levels at the phase transition temperature T cl . The XPS are measured with monochromatized Al K f radiation in the energy ra…
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…