Materials Literature
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Carbon nanotubes with different nitrogen contents were produced by the arc-discharge technique. The samples were first submitted to a concentration process (purification) and analyzed by x-ray photoelectron spectroscopy, electron-energy-loss spectroscopy, electron transmission, and scanning electron microscopy to stud…
The influence of the bulky and H-bonding Tyr side-chain on its Ala- and Gly-rich environment in Bombyx mori silk fibroin was examined by (13)C cross-polarization magic angle spinning (CP/MAS), static (2)H and (19)F NMR and molecular mechanics calculations. Model peptides of the type (AG)(15) were synthesized with Tyr…
We report solid-state NMR investigations of the effect of temperature and hydration on the molecular mobility of collagen isolated from bovine achilles tendon. (13)C cross-polarization magic angle spinning (MAS) experiments were performed on samples at natural abundance, using NMR methods that detect motionally averag…
Exceedingly large, planar porphyrin systems composed of 49 non-hydrogen nuclei in highly delocalized π systems display exceptionally low-energy transitions in UV/Vis/NIR spectroscopy and in cyclic voltammetry. The spectra shown are for cis palladium complex depicted and the corresponding trans isomer
Increased stability of oxidation catalysts results from the self-assembly of the catalysts under near-turnover conditions from oxidatively resistant precursors. The described polyoxometalate epoxidation catalyst uses a green oxidant (H2O2), solvent, and separation conditions and is fast, selective, and safe. This self…
Results based on Raman measurements of small-diameter nanotubes (NTs) are presented and discussed in this paper. The NTs with diameters from 1 nm down to 0.4 nm were produced either as the inner tubes in the double-wall carbon NTs (DWCNTs) or as tubes embedded in the channels of the zeolite crystals. While analysing t…
We discuss the feasibility of the embedded cluster approach for it ab-initio calculations of charge exchange between ions and a LiF surface. We show that the discrete density of valence states in embedded clusters converges towards the continuum limit of the density of states in the valence band of an infinitely exten…
The phase-field method has become in recent years the method of choice for simulating microstructural pattern formation during solidification. One of its main advantages is that time-dependent three-dimensional simulations become feasible. This makes it possible to address long-standing questions of pattern stability.…
We study the dynamics of spins in the canted antiferromagnetic hematite nanoparticles $α$-Fe$_2$O$_3$. The system includes an antiferromagnetic exchange ($J$) between two sublattices as well as the potential dominated by a uniaxial anisotropy and dissipates through the thermally triggered spin-phonon mechanism. The ex…
Charge control as a tool for assembly: Dense layers of individual, charged nanocrystals are formed at the aqueous/organic interface upon a slight reduction of the surface charge. The layers are remarkably robust, they creep up the glass (see picture). This method should be widely applicable to a broad range of charged…
A microwave excited non-equilibrium atmospheric pressure plasma source is developed and applied to chemical vapor deposition (CVD) of carbon nanotubes (CNTs). Multiwalled CNTs are successfully synthesized at a low temperature of 600°C by using mixtures of He/H 2 /CH 4 and He/H 2 /CF 4 . From gas phase observations, hi…
The radiation emitted from an EUV source is collected and focused by a suitable collector system. A reflective blazed grating is used in -1st diffraction order to select a definite spectral band around 13.5 nm wavelength from the broad-band emission spectrum of the source. The effective grating area is segmented into…
The polyhydroxyalkanoate (PHA) synthase (PhaC(Da)) from Delftia acidovorans DS-17 (formerly Comamonas acidovorans) has a unique large insertion consisting of 40 amino acid residues in the alpha/beta hydrolase fold region. In order to examine whether this insertion is necessary for enzyme function, we generated a mutan…
In the present work, we have developed a novel route to synthesize metal nanorods and nanofibers capped by polymer shells, which can be called the reverse micelle−gas antisolvent−ultrasound method. Using this method, we have successfully synthesized Ag core/polystyrene (PS) shell composite nanorods and nanofibers. By…
Effects of Donor Ion Doping on the Orientation and Ferroelectric Properties of Bismuth Titanate Thin Films, Choi, Eun Kyung, Kim, Sang Su, Kim, Jong Kuk, Bae, Ji Cheul, Kim, Won-Jeong, Lee, Yong-Ill, Song, Tae Kwon
The electron density distribution of the ferrimagnetic MnCu(pba)(H2O)3.2H2O chain compound, where pba stands for 1,3-propylenebis(oxamato), has been derived from high resolution X-ray diffraction measurements at 114 K using a multipolar model. The analysis of the chemical bonding has been carried out through the "Atom…
To investigate the effect of charge-spin-orbital correlations on electronic structures, anisotropic optical conductivity spectra have been investigated for twin-free crystals of various doped manganites ${R}_{1\ensuremath{-}x}{A}_{x}{\mathrm{MnO}}_{3}$ $(R=\mathrm{Pr}$ and Nd, $A=\mathrm{Ca}$ and Sr; $0.4<~x<~0.…
The trends to the formation of gum precursors in gasoline were studied through the yields and selectivities of C5 olefins in the conversion of both a VGO and nC16 over two equilibrium commercial FCC catalysts. The experiments were performed at 500 and 550 °C, catalyst-to-oil ratio of 6.1 and short contact times of up…
Abstract We prepared novel poly(methyl methacrylate) (PMMA)/CaCO 3 nanocomposites by using reverse micelle as a template. The nanoparticles of CaCO 3 were prepared by the reverse microemulsion with functional monomer, methyl methacrylate (MMA) as oily phase, and the PMMA/CaCO 3 nanocomposite was obtained via polymeriz…
Coordination to the “Os 3 (CO) 11 ” cluster core of substituted styrylpyridines such as trans -4-(4‘-NMe 2 -styryl)pyridine ( L 1 ), trans -4-(4‘- t -Bu-styryl)pyridine ( L 2 ), trans -4-(4‘-CF 3 -styryl)pyridine ( L 3 ), or trans,trans -4-(4‘-NMe 2 -phenyl-1,3-butadienyl)pyridine ( L 4 ) produces an enhancement of th…