Materials Literature
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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…
Classical molecular dynamics is applied to study the energy dissipation (the Q factor) of the cantilever-type beam oscillators of single wall and double-walled carbon nanotubes (CNTs). The study finds that the Q factor of the CNT beam oscillator varies with the temperature T following the 1/T(0.36) dependence. For sin…
The major objective of this research was to modify PLA film surfaces with the ultimate aim of making a bioactive surface that will show faster degradation. The PLA film was solvent-cast, and the film surfaces were grafted with poly(acrylic acid) (PAA) and poly(acrylamide) (PAAm) using a UV-induced photopolymerization…
Diffusion limited reactions of point defects were investigated in amorphous SiO2 exposed to UV laser light. Electron spin resonance and in situ absorption measurements at room temperature evidenced the annealing of E' centers and the growth of H(II) centers both occurring in the post-irradiation stage and lasting a fe…
The self-assembly of diaminododecane with dendritic l-lysine-based peptides to form gel-phase materials was investigated in a range of different solvents. The degree of structuring was modulated by the solvent employed, an effect which induced subtle changes in the mesoscale aggregate morphology and macroscopic behavi…
We show that the electron and hole Lande g factors in self-assembled III-V quantum dots have a rich structure intermediate between that expected for paramagnetic atomic impurities and for bulk semiconductors. Strain, dot geometry, and confinement energy significantly modify the effective g factors of the semiconductor…
Thermoluminescence (TL) kinetics in spatially inhomogeneous systems can be studied by various Monte Carlo algorithms. Recently, a new analytical approach was suggested for the isolated cluster model. The theory is based on the concept of trap structural functions (TSFs). TSFs depend solely on topological properties of…
Standard one-carrier kinetic models for thermoluminescence (TL) relate to the simple trap model (STM) and the model of localized transitions (LT). This paper presents a review of TL properties in various spatially correlated systems (SCS) which span the two limiting cases. A classification of kinetic models for SCS is…
We report first-principles linear response calculations on $\mathrm{Na}\mathrm{Co}{\mathrm{O}}_{2}$. Phonon frequencies and eigenvectors are obtained throughout the Brillouin zone for two geometries with different Na site occupancies. While most of the phonon modes are found to be insensitive to the Na site occupancy,…