Materials Literature
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(Ba1-xSrx)TiO3 (BST) ferroelectric thin films with Pb doped from 1 to 10 mol % were fabricated on Pt/Ti/SiO2/Si substrates by sol-gel technique in order to improve the crystallographic properties and decrease the ferroelectric relaxation and the diffuse phase transition. The microstructures, surface morphology, dielec…
Molecular-dynamics simulations of the crystalline silicon-silicon nitride interfaces are performed to investigate the mechanical failure mechanisms at the interfaces under external strain. At 8% applied tensile strain, parallel to the interface, regular crack initiation and propagation in silicon nitride and dislocati…
In this study, the effects of specific chemical modifications of amino acid side-chains on the in vitro enzyme degradation of type I collagen was studied. Two monofunctional epoxides of different size and chemistry were used to modify lysine and methylglyoxal was used to modify arginine. Lysine residues were modified…
Meta-hydroxyaniline was reacted with decyl bromide, dodecyl bromide, and cetyl bromide to produce new aniline derivative surfactants. The monomers (0.4 mol/L) were polymerized in aqueous solution of hydrochloric acid (1.0 mol/L) using sodium dichromate (0.1 mol/L) as oxidant at room temperature. The crstallinity of th…
The strain effects on the electronic structures of La0.67Ca0.33MnO3 (LCMO) and La0.8Ba0.2MnO3 (LBMO) thin films have been studied by O K-edge x-ray absorption near edge structure (XANES) spectroscopy. For LCMO, the first-principles calculations reveal that the features in the XANES spectra are associated with hybridiz…
The photoabsorption spectra of several of the most stable isomers of the Ti8C12 metallocarbohedryne are calculated using time-dependent density functional theory. Several ground-state magnitudes have been also calculated, such as cohesive energies, electronic gaps between the highest occupied and lowest unoccupied mol…
The Fourier transform infrared spectrum of TiC3 was observed by trapping the vapor produced during dual Nd:YAG laser ablation of Ti and C rods in solid Ar at approximately 9 K. Measurements of frequencies and 13C isotopic shifts have enabled the identification of the fanlike (C(2v)) isomer of TiC3 with fundamental vib…
While we are all familiar with liquid crystal displays, an industry currently worth more than US dollars 60 billion yr(-1) and growing rapidly, fewer people are aware of the breadth of the subject of liquid crystals--one that represents the study of the fourth state of matter. Liquid crystals are found as essential el…
CdS nanoparticles (NPs) functionalized with nucleotides were used to assemble layered NP arrays stabilized by H bonds (see scheme). The association of various nucleotides between the NPs and electrode, with subsequent sequential nucleotide linkages, allows control of the number of layers. The nucleotide-crosslinked Cd…
Zn 1 − x Mg x O nanoneedles were prepared by an ion-beam technique on Zn1−xMgxO thin films with Mg contents of up to 21at.%. The photoluminescence emission energies of the Zn1−xMgxO nanoneedles measured at room temperature increased monotonically with Mg contents and it reached 3.6eV when x=0.21. Random laser action w…
The formation energy of misfit dislocations in a ferroelectric thin film grown on compliant substrate is calculated based on the Landau-Devonshire formalism and Timosheko’s method for thermal stresses. The critical thickness is shown to change significantly according to the polarization in the film, leading to serious…
We measured the angular dependence of the 0th, +/-1 st, and +/-2 nd optical diffraction orders from a 50 microm thick transmission grating recorded in a UV-curable holographic polymer-dispersed liquid crystal (HPDLC) made from commercially available constituents. The analysis was performed for two orthogonal polarizat…
It is well known that surface roughness always enhances wetting for hydrophilic, but drying for hydrophobic surfaces. In this letter, the authors found that La0.7Sr0.3MnO3 coatings display distinct wettability from superhydrophilicity to superhydrophobictiy, which is tuned by their hierarchical microstructures obtaine…
Abstract The synthesis of a series of compounds containing the photochromic mononitrosyl cation, [RuNO(NH 3 ) 5 ] 3+ and metal complex paramagnetic anions [M(CN) 6 ] 3– [M = Cr ( 1 ), Fe( 2 )], [M(ox) 3 ] 3– [M = Cr( 3 ), Fe( 4 )] and [CrNO(CN) 5 ] 3– ( 5 ) is reported. The crystal structures of the salts 1 and 3 are…
Highly luminescent Si quantum dot embedded SiO x films were studied as down-converting emitters for solid-state lighting applications. Strong red photoluminescence was observed from these Si nanocrystal embedded films prepared by thermal evaporation of SiO in vacuum or an O 2 atmosphere followed by anneal at 1100 °C.…
Gelation is a common effect in aqueous suspensions of charged colloidal clay platelets at concentrations as low as 1 wt%. However, in systems of charged gibbsite [Al(OH)3] platelets, gelation can be delayed to concentrations as high as 50 wt% depending on the ionic strength. We investigated the phase behaviour of this…
The authors report the fabrication of grain-aligned [Ca2CoO3−δ]0.62CoO2 (Ca349) thick films and a multilayered thermoelectric unicouple of Ca349 and Ca0.9La0.1MnO3−δ (Mn113) using electrophoretic deposition (EPD) and magnetic alignment methods. Strongly c-axis-oriented Ca349 thick films were obtained by EPD performed…
Direct synthesis of single-walled carbon nanotubes (SWNTs) bridging prepatterned Mo electrodes has been achieved using laser-assisted chemical vapor deposition (LCVD). The synthesized SWNTs are found predominantly semiconducting. By controlling the spot size of the focused laser beam, synthesis of SWNTs can be achieve…
Adenoviral vectors are extensively used as gene-delivery vehicles in gene therapy. They are usually produced by HEK-293 cell (human embryonic kidney-293 cell) culture, which requires specially formulated serum-free medium, the cost of which is considerable or by supplementation with FBS (fetal bovine serum). The risk…
Steady‐state compressive creep rate of La 0.5 Sr 0.5 Fe 0.5 Co 0.5 O 3−δ (LSFC) and La 0.5 Sr 0.5 CoO 3−δ (LSC) is reported in the temperature region 900°–1050°C and stress range 5–28 MPa. The stress exponents for the two materials were 1.71±0.18 and 1.24±0.15, respectively. The activation energy for creep was conside…