Materials Literature
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Characteristics of the frictional layer in high-purity Ti3SiC2 and TiC-contained Ti3SiC2, sliding against low carbon steel, were investigated. The friction and wear tests were made using a block-on-disk type friction tester with sliding speed of 20 m/s and several normal pressures from 0.1 MPa to 0.8 MPa. It was found…
Abstract Co 2 CrAl and Co 2 CrSi are amongst the most studied Heusler alloys due to their half‐metallic character. These compounds are also well‐known to present ferromagnetism with high Curie temperatures. We show using first‐principles calculations that the creation of Cr antisites (Cr atoms at the Co sites) induces…
The formation, morphology, and structure of two-dimensional Langmuir-Blodgett (LB) assemblies of octadecyltriazole (ODT)-based metal-containing oligomers presenting, in the case of iron, the spin-crossover phenomenon is studied with Brewster angle microscopy, IR dichroism, X-ray diffraction, and atomic force microscop…
The design principle of split-ring resonators (SRRs) for realizing negative magnetic metamaterial is proposed through theoretical investigation of magnetic properties of SRRs from terahertz (THz) to the visible light region. To describe the frequency dispersion of metal throughout the frequency range, we consider the…
Promising future nanoscopic devices: Azobenzene polypeptides can be switched between an elongated trans and a compact cis conformation. Molecular dynamics simulations have been carried out to probe their elastic properties and to explain recent scanning probe microscopy experiments at the atomic level. The results sho…
We report the interfacial properties of monolayers of Ag nanoparticles 10-50 nm in diameter formed at the toluene-water interface under steady as well as oscillatory shear. Strain amplitude sweep measurements carried out on the film reveal a shear thickening peak in the loss moduli (G") at large amplitudes followed by…
Explicit, analytical expressions have been derived for the dependence of electrical conductivity, chemical expansion, and elastic modulus on point defect concentration and oxygen partial pressure using a consistent approach. In developing the model, expressions were first derived for the functional dependence of defec…
Numerical simulations of shock wave propagation through discretely represented powder mixtures were performed to investigate the characteristics of deformation and mixing in the Ni+Al system. The initial particle arrangements and morphologies were imported from experimentally obtained micrographs of powder mixtures pr…
We fabricated ZnO nanowire field effect transistors (FETs) and systematically characterized their low frequency (f) noise properties. The obtained noise power spectra showed a classical 1∕f dependence. A Hooge’s constant of 5×10−3 was estimated from the gate dependence of the noise amplitude. This value is within the…
Silica nanoparticles were synthesized by sol−gel route using a cationic surfactant, tetrabutylammonium bromide (TBAB), as a templating agent and a nonionic surfactant block copolymer [poly(ethylene glycol)- block -poly(propylene glycol)- block -poly(ethylene glycol)] to regulate the silicon oxide grain size. Ferric ox…
Many load-bearing soft tissues exhibit mechanical anisotropy. In order to understand the behavior of natural tissues and to create tissue engineered replacements, quantitative relationships must be developed between the tissue structures and their mechanical behavior. We used a novel collagen gel system to test the hy…
Epitaxial Ba0.7Sr0.3TiO3 (BST) thin films were deposited on various single crystal substrates, including LaAlO3 (LAO) (001), (LaAlO3)0.3(Sr2AlTaO6)0.35 (LSAT) (001), and SrTiO3 (STO) (001), using pulsed laser deposition in order to study their structural and electro-optic properties. All the films exhibit a good cryst…
Experimental tests performed on superelastic shape-memory alloys (SMAs) show a significant dependence of the stress—strain relationship on the loading—unloading rate, coupled with a not negligible oscillation of the material temperature. This feature is of particular importance in view of the use of such materials in…
Advanced composite materials (ACM) have become the basic materials of the aerospace engineering. In this paper, the requirements and the applications of ACM in the aerospace engineering were presented. Some hot-spot technological fields, such as lattice materials and structures, nano-composite materials and multi-func…
A light-induced insulator-to-metal ultrafast phase transition (PT) was observed in $\mathrm{V}{\mathrm{O}}_{2}$ thin films deposited on single-crystal sapphire and amorphous glass substrates. The PT and optical properties of $\mathrm{V}{\mathrm{O}}_{2}$ were characterized by transient reflection, absorption, and trans…
Dy 3 + doped oxyfluoride silicate glass was prepared and its optical absorption, 1.3μm emission, and upconversion luminescence properties were studied. Furthermore, the Judd-Ofelt [Phys. Rev. 127, 750 (1962); J. Chem. Phys. 37, 511 (1962)] intensity parameters, oscillator strengths, spontaneous transition probability,…
The geometric and electronic properties of supported Pt particles have been altered by modifying the ionicity (acid base properties) of the Al 2 O 3 support via the sol−gel method. The Si modifier resulted in the most acidic and Cs in the most basic Al 2 O 3 support. Application of the new Delta XANES technique shows…
Spallation in single crystalline nickel was studied using molecular dynamics simulations. The shock waves—incident waves, the waves reflected from sample free surfaces, and interference between reflected waves—create and destroy many microstructural features. These features, though unimportant in determining the spall…
The strain behavior of morphotropic, 1La2Sr-doped lead zirconate titanate was investigated. Particular attention was paid to the electric field induced strain (S-E characteristic) in the high field range for morphotropic materials having different Zr∕Ti ratios. Unipolar electrical cycles with maximum fields between 1…
The process of rearranging lamella crystal structures in isotactic polypropylene (iPP) and butene randomly copolymerized iPP (bPP) spherulites during hot drawing was investigated by in-situ microbeam small-angle X-ray scattering (SAXS)−wide-angle X-ray scattering (WAXS)−polarized optical microscopy (POM) simultaneous…