Materials Literature
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We report the spontaneous formation of unusual surface reliefs, in which two sets of sinusoidal gratings were hierarchically structured, merely by single-step holographic inscription on amorphous azopolymer films. By monitoring of growth behavior of surface reliefs during holographic inscription, we found that the for…
In the temperature range from room temperature to about 150°C, the prototypic phase-change material Ge2Sb2Te5 becomes amorphous upon hydrostatic compression. In the studied temperature range, the onset of amorphization is at about 15GPa and the material completely amorphizes at 25GPa; these values do not depend on tem…
Molecular dynamics (MD) simulations of Cu nanowires at 10 K with varying cross-sectional areas ranging from 0.3615 × 0.3615 nm 2 to 2.169 × 2.169 nm 2 have been performed using the embedded atom method (EAM) to investigate their structural behaviors and properties at high strain rate. Our studies reported in this pape…
Single crystals of ferroelectric K0.5Bi4.5Ti4O15 with a Bi-layered structure were grown by the flux method, and the properties of polarization hysteresis, piezoelectric strain, and leakage current were investigated along the polar a axis at 25°C. K0.5Bi4.5Ti4O15 crystals exhibited a large remanent polarization of 31μC…
We report on the magnetic properties of multiferroic hexagonal HoMnO <sub>3</sub> single crystals and polycrystalline samples with micrometer and nanometer particle size. We have studied the in-plane and out-of-plane magnetization of HoMnO<sub>3</sub> single crystals under low applied magnetic fields in the temperatur…
Abstract Polypropylene (PP)/octavinyl polyhedral oligomeric silsesquioxane (POSS) composites were prepared by two different processing methods: reactive blending and physical blending, and the crystallization behavior of PP and PP/POSS composites was studied by means of differential scanning calorimetry and polarized…
Abstract Preparation and polymerization of methylimidazolium‐based ionic liquids (ILs) that incorporate a thiophene moiety at the terminus of a C 10 alkyl chain are described. Both a bromide and nitrate salt of the amphiphilic thiophene IL self‐assembles in water (albeit the nitrate to a lesser extent), adopting colum…
Many fundamental cellular processes depend on enzymes that utilize chemical energy to catalyse unfavourable reactions. Certain classes of ATPases provide a particularly vivid example of the process of energy conversion, employing cycles of nucleotide turnover to move and/or rearrange biological polymers such as protei…
Abstract ZnS nanocrytsals of size ∼2.5 nm were prepared by chemical precipitation technique. Pressed pellets of nanostructured ZnS were implanted with He + ions at doses of 5 × 10 14 , 1 × 10 15 and 5 × 10 15 ions/cm 2 . Raman spectra of both unimplanted and He + ion implanted samples were recorded with ultraviolet (U…
We report here on the photo-switching dynamics of a Fe(III) molecular material undergoing a spin-crossover. The thermal spin conversion is observed by magnetic and spectroscopic measurements, as well as imaging. The photoinduced switching dynamics between the low-spin and the high-spin states is studied with a femtose…
The conductivity of carbon nanotubes and polyvinyl alcohol composites is significantly improved by addition of Fe2(SO4)3. The coordinated cations between nanotubes play a crucial role in lowering intertube hopping magnitude.
A single crystal of superconducting ${\text{Lu}}_{2}{\text{Fe}}_{3}{\text{Si}}_{5}$ was studied using the tunnel-diode resonator technique in the Meissner and mixed states. The temperature dependence of the superfluid density provides strong evidence for two-gap superconductivity and indicates that there are nearly eq…
This paper reports the effects of gamma ray irradiation and glass composition on the optical and infrared spectra of quaternary silicate glasses. Experimental results reveal the formation of radiation-induced absorption bands in the visible region attributed to nonbridging oxygen hole centres. The band gap energy and…
We report the observation of a deformation twin formed by a recently proposed self-thickening, cross-slip twinning mechanism. This observation verifies one more twinning mechanism, in addition to those reported before, in nanocrystalline face-centered-cubic metals. In this mechanism, once the first Shockley partial is…
We show that the dynamics of supercooled liquids, analyzed from computer simulations of the binary mixture Lennard-Jones system, can be described in terms of a continuous-time random walk (CTRW). The required discretization comes from mapping the dynamics on transitions between metabasins. This yields a quantitative l…
We present the effects of ion bombardment on ZnO nanowires caused by their exposure to an Ar inductively coupled plasma. The conductivity of the individual ZnO nanowire was increased in up to 3 orders of magnitude due to increase in both carrier concentration and mobility, with a substantial negative shift in the thre…
A multiple substrate, microwave plasma-assisted chemical vapor deposition synthesis process for single crystal diamond (SCD) is demonstrated using a 915MHz reactor. Diamond synthesis was performed using input chemistries of 6–8% of CH4∕H2, microwave input powers of 10–11.5kW, substrate temperatures of 1100–1200°C, and…
Abstract Fourier transform infrared (FT‐IR) and FT‐Raman spectra of 4‐fluoro‐ N ‐(2‐hydroxy‐4‐nitrophenyl)benzamide were recorded and analyzed. The vibrational wavenumbers and corresponding vibrational assignments were examined theoretically using the Gaussian03 set of quantum chemistry codes. The red‐shift of the NH‐…
The elastic response for a large catalog of carbon nanotubes subjected to axial and torsional strain is derived from atomistic calculations that rely on an accurate tight-binding description of the covalent binding. The application of the computationally expensive quantum treatment is possible due to the simplificatio…
In order to reduce the difficulties in the experimental realizations of the cloak but still keep good performance of invisibility, we proposed a perfect cylindrical invisibility cloak with spatially invariant axial material parameters. The advantage of this kind of cloak is that only ρ and φ components of μ (or ε) are…