Materials Literature
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A nanoscale molecular switch can be used to store information in a single molecule. Although the switching process can be detected electrically in the form of a change in the molecule′s conductance, adding spin functionality to molecular switches is a key concept for realizing molecular spintronic devices. Here we sho…
Over the last decade, nanoparticles have been used more frequently in industrial applications and in consumer and medical products, and these applications of nanoparticles will likely continue to increase. Concerns about the environmental fate and effects of these materials have stimulated studies to predict environme…
Coronary artery disease is a major problem worldwide. Stent implantation is a percutaneous interventional procedure that mitigates vessel stenosis, providing mechanical support within the artery. However, stenting causes physical damage to the arterial wall. The research presented here develops novel nano-structured f…
Structures of new barium dicarboxylates (salts of glutaric, adipic, pimelic, suberic, azelaic and dodecanedioic acids { 1–6 }) were characterized. Structure solution from powder data was performed in the cases of barium adipate { 2 }, pimelate monohydrate { 3 } and dodecanedioate { 6 }. Structures of barium glutarate…
The excited state charge transfer dynamics of an aromatic adsorbate to a rutile TiO(2) surface is studied using a core-hole clock (CHC) implementation of resonant inelastic x-ray scattering (RIXS) on the low femtosecond time scale. Comparing the abundance of the elastic and inelastic radiative N 1s core-hole decay cha…
Focused Ion Beam (FIB) 3D sequential sectioning has been used to reconstruct the morphology of surface oxides in 304 stainless steels in nuclear reactors in order to characterize environmental degradation. Several coupon specimens with prior cold work and oxidized under applied stress have been studied in detail. A no…
Future advanced gravitational wave detectors will need to be constructed using ultra low loss materials to achieve the desired sensitivity levels. Coating thermal noise which is related to mechanical loss has been determined to be a limiting factor for the sensitivity of these detectors and must be reduced. To achieve…
Electron energy loss spectroscopy provides a probe of the dielectric function of a material which can be affected by the size and morphology of a sample. In this paper, the effect on the loss function when hexagonal boron nitride is reduced to a single layer is investigated. The previously predicted red-shift of the s…
The fundamental optical effects that are the basis of the giant reflection band and anomalous negative transmission in a self-sustained rectangular dielectric grating slab in $p$ polarization and for incidence angle not very far from the Brewster's angle of the equivalent slab are investigated. Notice that the self-su…
Ge/GaAs heterostructure research is largely motivated by the application of this material in solar cells, metal–oxide–semiconductor field-effect transistors, mm-wave mixer diodes, temperature sensors and photodetectors. Therefore, understanding of how the properties of Ge/GaAs heterostructure depend on its preparation…
Two-dimensional arrays of polymer nanobowls can be fabricated by an oxygen plasma etching technique. The 2D colloidal crystals made of SiO(2) @PMMA particles are fabricated by a convective self-assembly method. The oxygen plasma treatment is applied to the colloidal crystals to selectively etch the PMMA shells. Becaus…
The phase, microstructure and Curie temperature of Ba 1−2x Ta 2x Ti 1−x Zn x O 3 (0.005 ≤ x ≤ 0.1) have been investigated in an attempt to widen its temperature stable region. The compositions formed dense, single-phase, fine-grained BaTiO 3 ceramics at x≤0.01 and multiphase ceramics at x ≥ 0.015. The dielectric const…
Cone and cylinder calorimeters are devices used to determine flammability characteristics of solid materials under prescribed heat inputs. Temperature and heat input distribution on the exposed surface of a specimen in a calorimeter can be affected by variations of position or size of the specimen. This work analyzes…
Here we demonstrate enhanced optical absorptions within three-dimensional inversed woodpile metallic photonic crystals fabricated via the combination of the direct laser writing method and the electrodeposition method. These metallic microstructures operating in the optical wavelengths are found to possess multiple en…
In the context of investigations of physical, chemical and electrical properties of ultra-thin layers of epitaxial and monocrystalline Sr(0.3)Ba(0.7)O on Si(100), we also investigated their thermal stability with x-ray photoelectron spectroscopy (XPS), electron energy loss spectroscopy (EELS), and low energy electron…
New ultra high strength (UHS) steels have been developed in order to get advantages in machine design and construction. Following benefits can be obtained for example: - less material usage due to lighter constructions; - better payload and less fuel consumption in vehicle industry; - energy saving in material product…
The optical near-field of metal films can be modified in a straightforward manner by incorporating nanostructures on the surface. The corresponding field enhancement, which may be due to the lightning rod effect as well as the excitation of plasmon modes, results in a local change of the optical surface response. A tr…
Small amount of (101¯3)ZnO domains were found in the m-plane ZnO films grown on m-sapphire by pulsed laser deposition, which provide strain relaxation of the m-ZnO matrix behaving as a low strain layer. Through carefully correlating low-temperature polarized photoluminescence spectra with the x-ray diffraction peak in…
Thermodynamic modeling of retention times in gas chromatography depends on the accurate estimation of thermodynamic parameters. Previous research has used manual injections of samples with coinjection of a dead time marker to obtain accurate measurements of the retention factor of analytes. Ideally this process would…
Owing to its low neutron absorption cross-section, large scattering cross section and thermal and chemical stability, graphite is a key component of operational nuclear reactors where it is used as a moderator, reflector and as major structural component for 90% of current UK nuclear plants. It is also of interest for…