Materials Literature
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N -(11-Trimethylammonioundecanoyl)- O, O ‘ -didodecyl tripeptide bromides and N -(11-trimethylammonioundecanyl)- O -dodecyl tripeptide bromides formed a parallel β-sheet structure when they aggregated in water and in CCl 4 . The parallel β-sheet was distinguished from the antiparallel counterpart by Fourier transform…
We have developed scanning near-field microwave microscopes which can image electrodynamic properties of superconducting materials on length scales down to about 2 $μ$m. The microscopes are capable of quantitative imaging of sheet resistance of thin films, and surface topography. We demonstrate the utility of the micr…
Using molecular dynamics (MD) with classical interaction potentials we present calculations of thermal conductivity and heat transport in crystals and glasses. Inducing shock waves and heat pulses into the systems we study the spreading of energy and temperature over the configurations. Phonon decay is investigated by…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
In this study, we utilized the substitution geometry of triethoxysilyl groups about an organic bridging group to control the outcome of the sol−gel polymerization process. The substitution geometry of two triethoxysilyl groups about a carbon−carbon double bond was determined to have a profound effect on sol−gel polyme…
The sonochemical irradiation of Fe(CO) 5 solution in Decalin has been carried out with and without an external magnetic field. Direct TEM measurements reveal that the sample obtained without a magnetic field consists of spongelike particles with a mean size of about 25 nm, whereas the sample synthesized in a 7 kG magn…
BACKGROUND: Graft thrombosis and intimal hyperplasia represent the major causes of graft failure. Heparin has been shown to have a beneficial effect on long-term patency and on prevention of intimal hyperplasia. Thus, the purpose of the present study was to evaluate the effect of heparin coating on patency rate and in…
Polyhydroxyalkanoate (PHA) is a family of polymers composed primarily of R-3-hydroxyalkanoic acids. These polymers have properties of biodegradable thermoplastics and elastomers. Medium-chain-length PHAs (MCL-PHAs) are synthesized in bacteria by using intermediates of the beta-oxidation of alkanoic acids. To assess th…
Mesoporous MCM-41 silica hierarchical structures consisting of a high yield (∼98%) of uniform-sized hollow spheres of diameter 5.0 ± 1.0 μm have been obtained. The nanochannels on the shell are in latitude direction and the inside of the micron spheres has intricate pillar structures producing structures of various to…
We study the combined effect of temperature and disorder in the spacer on the interlayer exchange coupling. The temperature dependence is treated on ab initio level. We employ the spin-polarized surface Green function technique within the tight-binding linear muffin-tin orbital method and the Lloyd formulation of the…
A main-chain, polydomain, smectic liquid crystalline elastomer (LCE) was prepared by reacting the LC epoxy monomer, diglycidyl ether of 4,4‘-dihydroxy-α-methylstilbene, with the aliphatic diacid, sebacic acid. When deformed in uniaxial tension, a “polydomain-to-monodomain” transition took place leading to bulk, macros…
We show that the experimentally observed behavior of thermal conductivity of dielectric glasses over a wide temperature range can be explained by a combination of two scattering processes. The first one comes from the phonon scattering due to biaxial dipoles of wedge disclinations while the second one is the Rayleigh…
We analyze the adiabatic magnetization of ferromagnetic clusters in an intermediate coupling regime, where the anisotropic potential is comparable to other energy scales. We find a non-monotonic behavior of the magnetic susceptibility as a function of coupling with a peak. Coriolis coupling effects are calculated for…
We report the first experimental observation of a commensurate twist-grain-boundary smectic- $A$ phase $({\mathrm{TGB}}_{A})$. The number of blocks per pitch is found to vary with temperature but is independent of the thickness of the well aligned sample. For the first time the variations with temperature of the dista…
We show that the conductivity of the quasicrystal $i$-AlPdRe follows a Mott's variable range hopping conduction law $\ensuremath{\sigma}(T)\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}{\ensuremath{\sigma}}_{0}\mathrm{exp}\ensuremath{-}({T}_{0}/T{)}^{1/4}$ in the temperature range $20--600\mathrm{mK}$. The $i$-Al…
Highly (100) oriented Pb(Zr0.53Ti0.47)O3 (PZT) films were prepared on Si substrates with ultrathin SiO2 buffer layer by pulsed laser deposition. Hysteresis measurements show that saturation polarization, remnant polarization and coercive field of the films reach 26 μC/cm2, 10 μC/cm2 and 70 kV/cm, respectively. The thi…
The optical absorption properties were investigated for mesoporous silica loaded with different amounts (up to 5% in weight) of silver (Ag) nanoparticles (less than 4 nm in diameter) into its pores. In contrast to the previously reported glasses containing Ag particles, in this Ag particle-loaded silica no apparent su…
Rare earth titanate pyrochlores are known to exhibit magnetic frustration. Large, high quality single crystals of a series of oxide pyrochlores, , have been grown by the floating zone technique, using an infrared image furnace. The crystals are roughly 5 - 6 mm in diameter and 40 - 60 mm in length and have been grown…
Cu-doped ZnS nanocrystals were prepared in an inverse microemulsion at room temperature as well as under a hydrothermal condition. X-ray diffraction analysis showed that the diameter of the Cu-doped ZnS nanocrystals particles was about 9 nm. These particles showed a strong photoluminescence intensity and a broad emiss…
Effective pyroelectric coefficients as large as 5 μC/cm2 °C, with peak responsivities at approximately 50 °C, were obtained from compositionally graded barium strontium titanate ferroelectric thin film devices formed on silicon using unbalanced magnetron sputter deposition. These effective pyroelectric coefficients ar…