Materials Literature
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We present an investigation of the plasmon-induced electromagnetic near-field around gold nanocrescent (NC) antennas which exhibit localized surface plasmon resonances (LSPRs) in the infrared. To probe the near-field behavior, we monitored the LSPR shift of NCs to adsorption of dielectric layers of varying thickness.…
Vanadium dioxide $({\text{VO}}_{2})$ is a strongly correlated oxide that undergoes a sharp metal-insulator transition (MIT) in the vicinity of room temperature. Fundamental knowledge of the semiconducting properties of thin film ${\text{VO}}_{2}$ is needed to advance our understanding of the microscopic transition mec…
In order to continue the current rate of improvements in aircraft performance, aircraft and components which are continuously optimized for all flight conditions, will be needed. Toward this goal morphing-capable, adaptive structures based on shape memory alloy (SMA) technology that enable component and system-level o…
Cobalt substitutions were investigated in Ni0.4Zn0.4Cu0.2Fe2O4 ferrites, initial complex permeability was then measured from 1 MHz to 1 GHz. It appears that cobalt substitution led to a decrease in the permeability and an increase in the μs×fr factor. As well, it gave to the permeability spectrum a sharp resonance cha…
We propose Raman-induced collinear difference-frequency generation (DFG) as a method to manipulate dynamical magnetization. When a fundamental beam propagates along a threefold rotational axis, this coherent second-order optical process is permitted by angular momentum conservation through the rotational analogue of t…
A local flexomagnetoelectric (A.P. Pyatakov, A.K. Zvezdin, 2009) effect in the magnetic domain walls (DWs) of the cubic hexoctahedral crystal has been investigated on the basis of a symmetry analysis. The strong connection between magnetic symmetry of the DW and the type of the distribution of the electric polarizatio…
We investigate the effect of epitaxial strain on [001]-oriented ${\text{LaAlO}}_{3}$ using first-principles density-functional calculations. We find a series of structural phase transitions between states characterized by different patterns of tilting of the ${\text{AlO}}_{6}$ octahedra. By tuning the biaxial strain f…
We have demonstrated a new method for the large-area graphene growth, which can lead to a scalable low-cost high-throughput production technology. The method is based on growing single layer or few-layer graphene films from a molten phase. The process involves dissolving carbon inside a molten metal at a specified tem…
Here, we show that the conductivity of conductor-insulator composites in which electrons can tunnel from each conducting particle to all others may display both percolation and tunneling (i.e. hopping) regimes depending on few characteristics of the composite. Specifically, we find that the relevant parameters that gi…
We analyze the surface plasmons (SPs) propagating along the optically pumped single-graphene layer (SGL) and multiple-graphene layer (MGL) structures. It is shown that at sufficiently strong optical pumping when the real part of dynamic conductivity of SGL and MGL structures becomes negative in the terahertz (THz) ran…
We take a numerical approach to analyze the mechanisms controlling the spacing of chimneys -- channels devoid of solid -- in two-dimensional mushy layers formed by solidifying a binary alloy. Chimneys are the principal conduits through which buoyancy effects transport material out of the mushy layer and into the liqui…
We have characterized a new Magnetic Force Microscopy (MFM) probe based on an iron filled carbon nanotube (FeCNT) using MFM imaging on permalloy (Py) disks saturated in a high magnetic field perpendicular to the disk plane. The experimental data are accurately modeled by describing the FeCNT probe as having a single m…
Following demands for materials with peculiar transport properties, e.g. in magnetoelectronics or thermoelectrics, there is a need for materials modeling at the quantum-mechanical level. We combine density-functional with various scale-bridging tools to establish correlations between the macroscopic properties and the…
In this part we present results of our ab initio calculations indicating that dispersion of the bands near the gap region for different phases of WO3 (namely, ε-WO3, δ-WO3, γ-WO3, β-WO3, orth-WO3, α-WO3, and hex-WO3) is rather close. The rapid increase in the absorption coefficient starts at the lower energy range for…
As synthesis techniques mature, BN nanotubes are likely to be increasingly valuable in fundamental physics studies and find application in a variety of forms—from dyeable, neutron-absorbing fabrics to high-temperature catalysts and photovoltaic devices.
Nanotechnology is expected to be promising in many fields of medical applications, mainly in cancer treatment. While a large number of very attractive exploitations open up for the clinics, regulatory agencies are very careful in admitting new nanomaterials for human use because of their potential toxicity. The very a…
Magnetic nanoparticles continue to garner widespread interest in biomedical applications, such as visualization agents in MRI, therapeutic vehicles for drug delivery and heat mediators in hyperthermia. Recent advances in colloidal synthesis and surface-functionalization techniques have greatly contributed to the desig…
Silver nanoparticles (AgNPs) are strong bactericidal agents but they are also cytotoxic. Embedding them in a polymer matrix may reduce their cytotoxic effect. In the present study, AgNPs in three average sizes were tested for their antibacterial activities and cytotoxicity. Nanocomposites from a new waterborne polyeth…
The catalytic chemical vapor deposition (CCVD) is currently the most flexible and economically attractive method for the growth of carbon nanotubes. Although its principle is simple, the precisely controlled growth of carbon nanotubes remains very complex because many different parameters influence the growth process.…
1,3-Propanediol (PDO), is now taking the transition from a traditional "specialty chemical" to a "commodity chemical". The market for PDO is growing rapidly as the technology develops. With the advancing PDO production technology, polytrimethylene terephthalate (PTT) as a new type of polyester has been applied in carp…