Materials Literature
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An explanation is given for the ultrafast insulator-to-metal transition in VO${}_{2}$ following photoexcitation. The photoinduced orbital imbalance induces a coherent motion of the V-V dimers affecting the electronic structure. After the closing of the gap, Boltzmann scattering equilibrates the electron densities. If…
AIM: To develop a simple assay for the capture and detection of rare cancer cells in whole blood using iron oxide-gold (IO-Au) nanoparticles. MATERIALS & METHODS: IO-Au nanoovals (NOVs) were synthesized, coated with Raman tags and linked with antibodies targeting breast cancer. An integrated system was constructed for…
Magnetic properties of undoped anatase, rutile, and amorphous titanium dioxide (TiO2) nanotubes grown by electrochemical anodization were studied by superconducting quantum interference device (SQUID) and electron spin resonance (ESR) methods in the temperature range 1.8-300 K. All anatase, rutile, and amorphous TiO2…
We study numerically the crystallization process in a supersaturated suspension of repulsive colloidal particles driven by simple shear flow. The effect of the shear flow on crystallization is two-fold: while it suppresses the initial nucleation, once a large enough critical nucleus has formed its growth is enhanced b…
Microporous Mo 2.5+ y VO 9 +δ with channels defined by seven-membered rings of corner-sharing MO 6 (M = Mo 5+/6+ or V 4+/5+ ) octahedra belongs to the family of isostructural MoVNbTeO compounds, which are very active and selective oxidation catalysts for light alkanes. The large open channels which can accommodate sma…
We present the fluorescence spectroscopy of a range of Dy 3+ doped tellurite (TeO 2 ) and germanate (GeO 2 ) glasses and compare with Dy 3+ doped ZBLAN glass. When excited using an 808 nm laser diode, Dy 3+ ions emit radiation at around 3 μm from the 6 H 13/2 → 6 H 15/2 (3500 cm −1 ) energy level transition, which has…
The low-energy erosion mechanisms of first-wall materials subject to a fusion plasma are poorly known theoretically, even though they pose a critical problem for the development of tokamak-like fusion reactors. Using molecular dynamics computer simulations and analytical theory, we have examined the fundamental mechan…
We study the effects of strain on the electronic properties and persistent current characteristics of a graphene ring using the Dirac representation. For a slightly deformed graphene ring flake, one obtains sizable pseudomagnetic (gauge) fields that may effectively reduce or enhance locally the applied magnetic flux t…
Abstract Cellulose, with its excellent mechanical properties and low weight, would be highly advantageous to employ in bioplastics and biocomposites applications. However, to expand the utilization of cellulose beyond its traditional uses, a modification of the fiber surface is often a prerequisite. One approach is to…
Abstract Unimorph cantilevers are made from 0.5BaTiO3‐0.5Sm2O3 (BTO‐SmO) self‐assembled vertical heteroepitaxial nanocomposite thin films, grown by PLD on (001) SrTiO3 single crystal substrates. The films remain piezoelectric up to at least 250 °C without losing any actuation. The longitudinal piezoelectric coefficien…
This paper presents a novel method for the self-assembly of aluminum nanoparticles on Si and fused silica. Due to high reactivity with oxygen, ex-vacuo annealing of thin deposited metal films, a method used extensively with other metals, does not work with aluminum. In the present experiment this problem was overcome…
ABSTRACT Closed‐cell polyimide rigid foams with different Calculated Molecular Weight (Calc'd Mn) and foam density (ρ) have been prepared by thermal foaming of nadimide‐endcapped imideoligomers (NAIO) powder. The NAIO powder was obtained by thermally treating of a PMR poly(amide ester) solution derived from the reacti…
ABSTRACT This study presents a multihole spinneret with a metal flat electrode to obtain uniform electric field and meet a high production requirement. We demonstrate that the multihole spinneret produces finer fiber diameters and more concentrated fiber mat compared to the conventional multineedle electrospinnig syst…
ABSTRACT In this study, two biodegradable matrices, polycaprolactone (PCL) and polylactide (PLA) were used to encapsulate for the first time a phase changing material (PCM), specifically dodecane (a paraffin which has a transition temperature at −10°C), through the use of the electrospinning technique with the aim of…
Most macromolecular crystallography (MX) diffraction experiments at synchrotrons use a single-axis goniometer. This markedly contrasts with small-molecule crystallography, in which the majority of the diffraction data are collected using multi-axis goniometers. A novel miniaturized κ-goniometer head, the MK3, has been…
ZnO nanorods doped with In or Ga were synthesized by a facile hydrothermal process on sol–gel deposited ZnO seed layers. The effects of dopants on the morphology, chemical bonding structure, and optical property of the ZnO nanorods were discussed based on the field emission scanning electron microscopy (FE-SEM), X-ray…
The photovoltaic and bolometric photoresponse in gapped bilayer graphene was investigated by optical and transport measurements. A pulse coincidence technique at $1.5\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ was used to measure the response times as a function of temperature. The bolometric and photovoltaic response…
This article describes the synthesis and functions of phosphine or phosphine oxide functionalized networks (PP-P or PP-PO; PP = porous polymer). These materials were predominantly microporous and exhibited high surface areas (S(BET): 1284 and 1353 m(2) g(-1) for PP-P and PP-PO, respectively), with high CO2 (2.46 and 3…
In this article, we present a brief review about polymeric shape memory materials (SMMs) and typical applications of these materials for functioning as actuators. A couple of generic working mechanisms to enable the shape memory effect (SME) in materials are introduced, together with some relatively new shape memory p…
High–energy‐storage density capacitors with thin films of 0.5 Bi ( Ni 1/2 Ti 1/2 ) O 3 –0.5 PbTiO 3 ( BNT – PT ) were fabricated by chemical solution deposition technique on Pt / Ti / SiO 2 / Si substrates. The dense thin films with pure‐phase perovskite structure could be obtained by annealing at 750°C. High capacita…