Materials Literature
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Thin films of poly(vinyl alcohol) (PVA) polymer were prepared on a flat, nonporous, poly(styrene) support matrix by adsorption from aqueous solution and were characterized in order to investigate the nonspecific adsorption of proteins to a chromatographically relevant surface. The integrity and surface coverage of the…
We show that D-mode Raman scattering in single-walled carbon nanotubes is due to a double-resonant Raman process. The unusual shift of the D-mode frequency with excitation energy is even expected for a single nanotube. The magnitude of the shift and the D-mode frequency depend strongly on the tube's diameter and chira…
The collective behavior of dislocations in jerky flow is studied in Al-Mg polycrystalline samples subjected to constant strain rate tests. Complementary dynamical, statistical and multifractal analyses are carried out on the stress-time series recorded during jerky flow to characterize the distinct spatio-temporal dyn…
We have implemented a systematic LSDA and $\mathrm{LSDA}+U$ study of the double perovskites ${A}_{2}{\mathrm{FeReO}}_{6}$ $(A=\mathrm{B}\mathrm{a},\mathrm{S}\mathrm{r},\mathrm{C}\mathrm{a})$ and Sr${}_{2}M$MoO${}_{6}$ $(M=\mathrm{C}\mathrm{r},\mathrm{M}\mathrm{n},\mathrm{F}\mathrm{e},\mathrm{C}\mathrm{o})$ for underst…
The dynamic magnetic properties of the distorted perovskite system ${\mathrm{La}}_{0.7\ensuremath{-}x}{\mathrm{Y}}_{x}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ $(0<~x<~0.15)$ have been investigated by ac susceptibility and dc magnetization measurements, including relaxation and aging studies. All investigated sampl…
The crystal and magnetic structures of newly synthesized ${\mathrm{Sr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~1)$ and ${\mathrm{Sr}}_{1\ensuremath{-}y}{\mathrm{Ba}}_{y}{\mathrm{MnO}}_{3}$ $(y<~0.2)$ perovskite materials (of the $\mathrm{AB}{\mathrm{O}}_{3}$ type) were investigated usi…
The electronic transport properties through junctions connecting nanographite ribbons of different or same width are investigated by means of the Landauer-B\"uttiker approach using a tight binding model. Graphite ribbon with zigzag boundary has a single conducting channel of edge states in the low-energy regime. The e…
BACKGROUND: Molecular imaging of thrombus within fissures of vulnerable atherosclerotic plaques requires sensitive detection of a robust thrombus-specific contrast agent. In this study, we report the development and characterization of a novel ligand-targeted paramagnetic molecular imaging agent with high avidity for…
Abstract The glass‐transition temperatures ( T g ) of some polymers reported in the literature have always been a source of great uncertainty. The values reported for poly(methacrylonitrile) (PMAN, 100 and 120°C) are well above the value determined in this study (67°C). It is clearly shown by FTIR and DSC work that fo…
The electronic structures and spectra have been calculated using the INDO-single- and double-excitation configuration interaction method, and following combination with the sum-over-states method the dynamic third-order polarizabilities in the third-harmonic generation (THG), electric-field-induced second harmonic gen…
A Pb5Ge3O11 metal–ferroelectric–metal–oxide–silicon memory transistor has been fabricated. The device showed a memory window of about 2 V. The memory window was almost saturated at the operation voltage of 2 V. The “off” state drain current (ID) at VD of 0.1 V and VG of 0.5 V is about 1×10−8 A. The “on” state drain cu…
We report on the conductance of multiwalled carbon nanotubes as a function of voltage and temperature between room temperature and 4.2 K. The data show a monotonic decrease in conductance as the temperature is lowered. At temperatures below about 20 K, a nonlinearity develops in the $V(I)$ data, corresponding to a pro…
The electrical resistivity \ensuremath{\rho} and the thermopower \ensuremath{\alpha} of the transition-metal pentatelluride system ${\mathrm{Hf}}_{1\ensuremath{-}X}{\mathrm{Zr}}_{X}{\mathrm{Te}}_{5\ensuremath{-}Y}{\mathrm{Sb}}_{Y}$ have been measured over a broad range of temperature, $10\mathrm{K}<T<300\mathrm{…
Annealing atmosphere effects on domain structures and electrical properties of Pb[(Zn1/3Nb2/3)0.5(Zr0.47Ti0.53)0.5]O3 (PZN–PZT) ferroelectric materials were investigated. The PZN–PZT specimens were annealed in argon, air, oxygen, and PbZrO3 atmospheres after being sintered at 1100 °C in air. The as-sintered specimens…
We have examined the valence-electron emission from Cu, Ge, GaAs, InP, and NiO single crystals under the condition of strong x-ray Bragg reflection; i.e., in the presence of the spatially modulated x-ray standing-wave interference field that is produced by the superposition of the incident and reflected x-ray beams. T…
Abstract The chitosan hydroxyl azacrown ether was synthesized by reaction of hydroxyl azacrown ether with epoxy‐activated chitosan. The C 2 amino group in chitosan was protected from the reaction between benzaldehyde and chitosan to form N ‐benzylidene chitosan. After reaction with epichlorohydrin and azacrown ether,…
The injection of holes from a Ag electrode into poly-dialkoxy-p-phenylene vinylene is investigated by measuring the current–voltage characteristics as a function of temperature. For this model system, the hole injection is hindered by a contact energy barrier of about 1.0 eV. The observed temperature dependence of the…
A low-field theory for paramagnetic relaxation enhancement (PRE), appropriate for the outer-sphere relaxation, is presented for the electron spin quantum number S = 1, 3/2, 2, 5/2, 3 and 7/2. The theory is used to calculate the PRE at low magnetic field, as a function of the translational diffusion coefficient, for va…
Abstract Polyacrylic acid (PAA) blending with lactose or polyol, a lactose derivative, is investigated by Fourier transform infrared, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and stress–strain tests. The IR spectra of PAA/lactose blends exist shifting around 1700 cm and 3400 cm −1 , i…
Optical properties of SrBi2Ta2O9 (SBT) ferroelectric thin films were investigated by spectroscopic ellipsometry at room temperature in the 1.5–5.5 eV spectral range. The films were grown on platinized silicon (Pt/Ti/SiO2/Si) with a Bi/Sr ratio (x) range from 1.2 to 2.8 by pulsed-laser deposition. The measured pseudodi…