Materials Literature
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Abstract The structural, electronic, and elastic properties of ScN and ScP in NaCl (B 1 phase) and CsCl (B 2 phase) structures and the phonon dispersion at ambient and high pressure, close to phase transition, have been investigated by using first‐principles pseudopotential method in the framework of density functiona…
Jute fiber mat (hessian cloth) reinforced PET-based composites (50% fiber by weight) and E-glass fiber matreinforced PET based composites (50% fiber by weight) were fabricated by compression molding and the mechanical properties tensile strength (TS), tensile modulus (TM), elongation at break (%), bending strength (BS…
Dense aluminium nitride ceramics were prepared by spark plasma sintering at a lower sintering temperature of 1700°C with Y 2 O 3 , Sm 2 O 3 and Dy 2 O 3 as sintering additives respectively. The effects of three kinds of sintering additives on the phase composition, microstructure and thermal conductivity of AlN cerami…
Abstract A treatment of graphite fluoride C 2 F with hydrazine vapor resulted in development of conductive surface layer. Exposure of the reduced C 2 F sample to gaseous NH 3 (∼5% in ambient air) was shown to lead to rapid increase in layer resistance. Relative change of resistance averaged over three cycles is ∼14%.…
Nanoflakes, one type of supramolecules that consist of alternating inorganic layers separated by organic moieties, are demonstrated as a good candidate for energy absorption as a thin film. When a bulky molecule is inserted between those layered structures, both modulus and specific energy absorption were increased 12…
Lead sulfide (PbS) microtowers on silicon substrates, having the physical properties of bulk PbS, have been synthesized. Optical nonlinearity studies using the open aperture z-scan technique employing 5 ns and 100 fs laser pulses reveal effective two-photon type absorption. For nanosecond excitation the nonlinear abso…
Abstract We show encapsulation of electrical contacts to freestanding single‐walled carbon nanotubes (SWNTs) by selective nucleation of Al 2 O 3 from atomic layer deposition (ALD). Passivating electrical contacts is often required to prevent degradation of devices, and for chemical sensing it can separate sensing mech…
Vertically-aligned silicon nanowires (SiNWs) that demonstrate reductions of phonon thermal conductivities are ideal components for thermoelectric devices. In this paper, we present large-area silicon nanowire arrays in various lengths using a silver-induced, electroless-etching method that is applicable to both n- and…
We investigate the distribution of element-specific magnetic moments and changes in the spin-resolved unoccupied density of states in a series of half-metallic ${\text{Co}}_{2}({\text{Mn}}_{x}{\text{Ti}}_{1\ensuremath{-}x})\text{Ge}$ Heusler alloys using x-ray magnetic circular dichroism. The Co and Mn magnetic moment…
Resonant x-ray Bragg diffraction experiments on space group forbidden reflections of type $(0k0)$ with $k$ odd taken in the vicinity of the $\text{Fe}\text{ }K$ edge are used to study magnetoelectric effects in ${\text{GaFeO}}_{3}$. The main intensity of the various spectral features is caused by the E1-E1 transition…
The optical gaps of free and embedded Si nanoclusters are studied within the time-dependent local-density approximation. The effects of deformation, the bonding of individual O atoms on the surface, and coverage by ${\text{SiO}}_{2}$ layers on the highest occupied molecular orbital-lowest unoccupied molecular orbital…
Abstract Kenaf/unsaturated polyester composites filled with montmorillonite (MMT) filler were produced. Overall, the study showed that, for samples with kenaf filler only, the strength properties decreased as the kenaf filler loading was increased from 40 to 60%. The increase in the kenaf filler loading reduced the am…
Composite silicon–polycrystalline chemical vapour deposition (CVD) diamond wafers are potential substrates for GaN-based devices for use in harsh environments due to their high thermal conductivity and chemical stability. When cooled from a typical diamond deposition temperature of approximately 800 to 25 °C wafer bow…
The Ostwald rule of stages describes the conjectured transitioning through metastable polymorphic crystal structures during crystallization. Direct observation of the Ostwald rule of stages using was performed using solutions of simple amino acids by second-order nonlinear optical imaging of chiral crystals (SONICC).…
An effective chemical route to nanostructured tungsten oxide films derived from a peroxopolytungstic acid (PTA)/thiourea precursor solution is demonstrated. The conventional procedure of preparing the precursor needs more than 24 h for well-mixing and refluxing the PTA-based solution, while the thiourea-assisted appro…
A method for fabricating colloidal CdSe nanocrystals at low reaction temperatures was developed. The transition from CdSe clusters to continuously-growing nanocrystals was found to be crucial in the formation of high-quality quantum dots with narrow size distribution and efficient, tunable optical properties.
We report the formation of nickel borides, at room temperature and pressure, from the decomposition of NaBH(4) promoted by the addition of nickel bromide at different concentrations in a dispersing organic medium, tetrahydrofuran and pentane. The nickel borides, formed as amorphous powders, were analyzed, and the stru…
We demonstrate that it is possible to confine electromagnetic radiation in cavities that are significantly smaller than the wavelength of the radiation it encapsulates. To this aim, we use the techniques of transformation optics. First, we present a ``perfect cavity'' of arbitrarily small size in which such confined m…
In this work we attempt to predict the work of separation of crosslinked diglycidyl ether of bisphenol (A) (DGEBA) adhesive confined between two rigid adherends. To this end we start from merely the molecular structure of DGEBA and coarse grain the molecule into a chain comprised of three superatoms. These three super…
The ability to control the bond scission sequence of O-H, C-H, and C-O bonds is of critical importance in the effective utilization of oxygenate molecules, such as in reforming reactions and in alcohol fuel cells. In the current study, we use methanol as a probe molecule to demonstrate the possibility to control the d…