Materials Literature
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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…
Abstract The presentation of a new conductive composite with good effective applications like negative and positive temperature coefficient of conductivity thermistors (i.e., V‐shaped thermistors) and electromagnetic interference shielding effectiveness (EMI) was the aim of this study. The effect of boron carbide (B 4…
ZnO films were grown on sapphire substrates by rf magnetron sputtering and their structural and optical properties were characterized in detail. It was observed that high quality single crystal ZnO films are obtained when grown at high temperature (>600 °C) and low plasma power in oxygen-rich ambient. Films grown at 8…
Transmission electron diffraction (TED) combined with direct methods have been used to study the sqrt[3]xsqrt[3]R30 degrees reconstruction on the polar (111) surface of MgO and refine the valence charge distribution. The surface is nonstoichiometric and is terminated by a single magnesium atom. A charge-compensating e…
The correlation between the residual stress and the atomic-bond structure has been investigated in detail in hydrogenated amorphous films (a-C:H). The relaxation process was studied in relation with the Raman characteristics evolution and the induced metric distortions during growth. The analysis of the Raman data sho…
ZnO-added 0.41PNN–0.36PT–0.23PZ ceramics cannot be sintered below 950°C. However, when CuO is added, the liquid phase forms and specimens can be sintered even at 850°C. The dielectric constant ( ε T 3 / ε o ), piezoelectric constant ( d 33 ) and electromechanical coupling factor ( k p ) increase with the addition of C…
High-quality single-walled carbon nanotubes (SWNTs) have been synthesized over Fe−Mo/MgO catalyst by catalytic decomposition of ethylene at 800 °C. The produced carbon material primarily consists of a SWNT bundle with few defects and a very small amount of amorphous carbon coating. The diameter of an individual SWNT i…
The first hybrid radical salt of bis(ethylenedithio)tetrathiafulvalene (BEDT‐TTF) using a polyoxovanadate as the counterion, (BEDT‐TTF) 5 [H 3 V 10 O 28 ]·4H 2 O, has been obtained and characterized. It contains segregated mixed‐valence 2D stacks of organic radicals interleaved by anionic layers of [H 3 V 10 O 28 ] 3–…
The difference in luminous transmittance (Δ T lum ) upon switching of VO 2 films strongly affects its solar controllability when used as a thermochromic window. It was found that Δ T lum is controllable by film thickness. Optical calculation for a VO 2 film on quartz glass revealed that the low-temperature semiconduct…