Materials Literature
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Abstract Summary: The pyrazinoquinoxaline‐based conjugated polymers poly(2,7‐diphenylpyrazino(2,3‐ g )quinoxaline‐3,8‐diyl‐1,4‐phenylene) (PZQP) and poly(2,7‐diphenylpyrazino(2,3‐ g )quinoxaline‐3,8‐diyl‐2,5‐thiophene) (PZQT) have been synthesized and characterized. PZQP and PZQT have optical band gaps of 2.44 and 1.7…
Abstract Correlations among the three components, δ d 2 (dispersion), δ h 2 (hydrogen‐bonding), and δ p 2 (polar) that make up the Hansen solubility parameter equation, δ o 2 = δ d 2 + δ h 2 + δ p 2 , have been analyzed for a large number of organic solvents. A relationship is found that enables δ h and δ p to be esti…
The $\mathrm{Sr}$ and $\mathrm{SrO}$ monolayers on $\mathrm{Si}(001)$ and the ${\mathrm{SrTiO}}_{3}∕\mathrm{Si}(001)$ interface have been simulated by means of total energy minimization within the density functional theory formalism and the generalized gradient approximation form of exchange-correlation potential. It…
The amphiphilic and self-polymerizable monomer 1,8-dihydroxymethyl-1,3,5,7-octatetrayne (DHMOTY) was prepared and dispersed in water by itself or with the help of phenyl trimethylamine hydroxide. Accordingly, cross-linked poly(1,8-dihydroxymethyl-1,3,5,7-octatetrayne) (polyDHMOTY) nanospheres were produced due to spon…
Au(2)H(-) was recognized and confirmed as a minor contamination to typical photoelectron spectra of Au(2) (-), produced by laser vaporization of a pure Au target using an ultrahigh purity helium carrier gas. The hydrogen source was shown to be from trace H impurities present in the bulk gold target. Carefully designed…
Abstract Recent developments in the field of solid state synthesis have given us access to synthesis conditions that range from effective negative pressures of about ‐1 GPa to high positive values exceeding 10 or even 100 GPa. Thus, it becomes necessary to explore not only the landscape of potential energy, but also t…
ADVERTISEMENT RETURN TO ISSUEPREVNoteSuperhydrophobic, High Surface Area, 3-D SiO2 Nanostructures through Siloxane-Based Surface FunctionalizationShufen Tsoi, Enrico Fok, Jeremy C. Sit, and Jonathan G. C. VeinotView Author Information Department of Electrical and Computer Engineering, University of Alberta, Edmonton,…
Ge 2 Sb 2 Te 5 film was deposited by RF magnetron sputtering on Si (100) substrate. The structure of amorphous and crystalline Ge 2 Sb 2 Te 5 thin films was investigated using XRD, Raman spectra and XPS. XRD measurements revealed the existence of two different crystalline phases, which has a FCC structure and a hexago…
The enzymatic degradation of poly( d, l -lactide) (PLA), poly(ε-caprolactone) (PCL), and their blends by Novozym 435 was studied in toluene at 60 °C. Both of the polymers were found to degrade by specific chain end scission. A model based on the continuous distribution kinetics was developed to determine the rate coef…
Abstract Summary: Mussel protein can serve as a strong and water‐resistant adhesive, but is expensive and not readily available. Soy protein is inexpensive, abundant, and readily available, but is a poor adhesive. Mussel protein contains a high amount of mercapto‐containing cysteine. This study revealed that increasin…
The way fluids flow into and fill nanotubes is of wide interest; however, there are currently no experimental data or validated theoretical models for this nanoscale process. We have carried out molecular dynamics simulations of carbon nanotubes imbibing oil at an oil/vapor interface at 300 K. We find that the smalles…
An 8Mb Non-Volatile Memory Demonstrator incorporating a novel 0.32 /spl mu/m/sup 2/ Phase-Change Memory (PCM) cell using a Bipolar Junction Transistor (BJT) as selector and integrated into a 3V 0.18 /spl mu/m CMOS technology is presented. Realistically large 4Mb tiles with a voltage regulation scheme that allows fast…
The chemical adsorption of H atoms on an (8,0) zigzag boron nitride nanotube is studied using the density functional theory with the supercell method. One to four H atoms per 32 B and 32 N are considered. The results show that H atoms prefer to adsorb on the top sites of adjacent B and N atoms to form an armchair chai…
The 15 3-periodic minimal nets of Beukemann & Klee [Z. Kristallogr. (1992), 201, 37-51] have been examined. Seven have collisions in barycentric coordinates and are self-entangled. The other eight have natural tilings. Five of these tilings are self-dual and the nets are the labyrinth nets of the P, G, D, H and CLP mi…
Abstract The reinvestigation of the crystal structure of Ba 8 Ge 43 □ 3 (space group $Ia{\bar 3}d$ , no. 230; a = 21.3123(5) Å; Z = 8; Pearson symbol cI 408) shows a full ordering of the vacancies (□) in the germanium framework. This ordered crystal structure can be considered as a derivative of an ideal “Ba 8 Ge 46 ”…
The photophysical and luminescence quenching properties of a platinum(II) acetylide-based conjugated polyelectrolyte, Pt-p, which features carboxylic acid solubilizing groups are reported. The Pt-acetylide polymer is water soluble, and it exhibits phosphorescence from a triplet pi,pi exciton based on the conjugated ba…
We report the observation and characterization of a series of stable bimetallic 18-valence-electron clusters containing a highly symmetric 12-atom icosahedral Au cage with an encapsulated central heteroatom of Group VB transition metals, M@Au(12) (-) (M=V,Nb,Ta). Electronic and structural properties of these clusters…
The selective catalytic reduction of NO by H 2 (H 2 -SCR) was carried out with Pt catalysts supported on various zeolites and nonzeolitic metal oxides. NO conversion and N 2 selectivity were strongly dependent on the supports; a high NO conversion was obtained over Pt/SiO 2 -Al 2 O 3 and Pt/SiO 2, while the N 2 select…
In this paper, we use Fourier transform infrared (FTIR) spectroscopy and stripping voltammetry at saturation and submonolayer CO coverages to shed light on the influence of size on the CO adsorption and electro-oxidation on Pt nanoparticles. Pt nanoparticles supported on low surface area (∼1 m 2 g -1 ) carbon (Sibunit…
A novel methodology for in situ cross-linking of polymeric fibers during electrospinning is described. The electrospinning apparatus was modified to facilitate UV irradiation of the electrospun fibers while in flight to the collector target. Three polymers with different mol % of the photoreactive cinnamate functional…