Materials Literature
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Ab initio molecular dynamics simulations are performed to study the liquid and undercooled liquid of zirconium. Local structure orders in the liquid at temperatures from 2500 K down to 1830 K are analyzed by using the recently developed cluster alignment method. Our study clearly shows the presence of body-centered-cu…
We report on isothermal pulsed (20 ms) field magnetization, temperature dependent AC – susceptibility, and the static low magnetic field measurements carried out on 10 nm sized Pr0.5Ca0.5MnO3 nanoparticles (PCMO10). The saturation field for the magnetization of PCMO10 (∼ 250 kOe) is found to be reduced in comparison w…
By use of density functional theory and nonequilibrium Green’s function technique we have studied the electronic structure and transport properties of tubular Janus structures composed of hybridized carbon (C) and boron-nitride (BN) nanotubes (NTs) with carbon caps at both ends. The effect of chirality was probed by f…
Nanoscale control of oxygen nonstoichiometry in oxide thin films has become more and more important as the characteristic sizes of oxide devices have been reduced to the nanometer scale. We propose a new in situ electrochemical approach for nanoscale characterization of oxygen stoichiometry in epitaxial oxide thin fil…
Abstract A numerical model is presented to simulate the fiber motion in the airflow inside the vortex spinning nozzle (VSN). The coupling between the fiber and airflow together with the fiber‐wall contact is solved. Based on the numerical model, the motional characteristics of four types of fibers—cotton, viscose rayo…
We have studied and analyzed the laser-induced voltage effect in highly c-axis-oriented polycrystalline NaxCoO2. The textured and layered stacking NaxCoO2 (x ∼ 0.7) bulks were prepared by a solid-state reaction process. Under the irradiation on Na0.67CoO2 bulk surface with pulsed laser (λ = 248 nm), the induced voltag…
Ein supramolekularer Draht: Mit einem Polymergel umhüllte, meterlange, supramolekulare Drähte wurden in einem mikrofluidischen Kanal hergestellt (siehe Bild). Die selbstorganisierten Nanofasern in den Drähten richteten sich parallel zum laminaren Fluss aus. Die mechanische Stärke dieser Drähte war so groß, dass die Dr…
Experiments investigating fracture and resistance to plastic deformation at fast strain rates (>106 s−1) were performed via laser ablation on thin sheets of aluminum and aluminum alloys. Single crystal high purity aluminum (Al-HP) and a single crystal 1100 series aluminum alloy (AA1100) were prepared to investi…
We report interactions of low pressure Ar, H2, and Ar/H2 mixture plasmas with a-C:H films. Surface evolution and erosion of a-C:H films were examined for ion energies up to 200 eV by rf biasing the substrates. Film surfaces were characterized using in situ ellipsometry, x-ray photoelectron spectroscopy, and atomic for…
Motivated by iron-based superconductors, we develop a self-consistent electronic theory for the itinerant spin excitations in the regime of coexistence of the antiferromagnetic stripe order with wave vector ${\mathbf{Q}}_{1}=(\ensuremath{\pi},0)$ and ${s}^{+\ensuremath{-}}$ superconductivity. The onset of superconduct…
Abstract Lattice deformation is observed in nanocrystalline silicon synthesized by ion beam induced phase separation of SiO x films. The separation of silicon and silicon dioxide phases is achieved in the suboxide films after irradiation with a 100‐MeV Ag beam. The interaction of a high‐energy heavy ion beam with the…
It has long been recognized that T·T mismatches can adopt two different modes of exchangeable wobble base pairs in which no preferential pairing mode has been observed. In this study, we have performed a systematic nuclear magnetic resonance (NMR) investigation to study the sequence context effect on the pairing modes…
The self-assembly of well-defined organic–organometallic polystyrene- b -poly(ferrocenylmethyl(dimethylaminopropynylsilane)) (PS- b -PFAMS) diblock copolymers has been systematically investigated by varying the volume fraction of the organometallic block (PFAMS). Quaternization of the PFAMS block yielded PS- b - q PFA…
Structural, electronic, and magnetic properties of the Fe-, Co-, Ni-, and V-intercalated graphene bilayer sandwich (denoted by C 2 |M|C 2, M = Fe, Co, Ni, and V) and graphene on hexagonal boron nitride ( h -BN) bilayer sandwich (denoted by C 2 |M|BN, M = Fe, Co, Ni, and V) are studied by using density functional theor…
This work investigates dry micro-electro-discharge machining (μEDM) of vertically aligned carbon nanotube (CNT) forests that are used as cathodes in the process, as opposed to conventional μEDM where the material to be machined forms the anode, toward achieving higher precision in the patterned microstructures. The ne…
Abstract To improve the toughness of isotactic polypropylene (iPP), by blending modification or special processing techniques, is an ongoing pursuit in the polymer community. In this study, the toughness of injection‐molded iPP bars has been enhanced by about four times upon annealing at 140°C, in parallel with slight…
Our investigations using low-temperature Raman spectroscopy, dielectric, and magnetodielectric studies of as-prepared and vacuum-annealed BiFeO3 ceramics revealed two dielectric anomalies near 25 and 281 K. Systematic studies were carried out to probe the anomaly near 25 K which exhibits clear frequency dependence and…
The biogeochemical silicon cycle is the focus for many researchers studying the dissolution of silicon species from quartz, amorphous, and biogenic silica. Furthermore, the precipitation of biogenic silica by diatoms, radiolarian, sponges, and plants is also a popular focus for research. The ornate silica structures c…
Poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] 90/10 wt% copolymers were fabricated by extrusion-blown and hot press-quench methods. The electric field induced phase transition was observed starting from 79 MV/m, and completing at 216 MV/m, in these copolymers. The transition was manifested by a change fro…
Increased strength and improved erosion resistance are required for future infrared windows working in harsher mechanical and thermal environments than those used today. In this study, Y 2 O 3 –MgO–ZrO 2 composite nanopowders were synthesized using a sol–gel combustion process. The fully dense Y 2 O 3 –MgO–ZrO 2 nanoc…