Materials Literature
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The modelling and experimental results of deformations of elastomeric rods with embedded two-way shape memory effect actuators is presented in this work. A procedure is established to train Nitinol shape memory alloy (SMA) wires to exhibit the two-way shape memory effect, a hysteretic behaviour involving a thermally i…
Pattern formation at the solid-liquid interface of a growing crystal was studied in directional solidification using a perturbation technique. We analyzed both experimentally and numerically the stability range and dynamical selection of cellular arrays of ``doublets'' with asymmetric tip shapes, separated by alternat…
In this work, we study the phase separation of deeply quenched mixtures in which the diffusion coefficient depends on the local composition field $\ensuremath{\varphi}.$ In one dimension (1D), the system evolves until it reaches a spatially periodic steady state, with a period that, for instant quenching, coincides wi…
Moisture vapor transport through waterproof breathable samples and clothing sys tems under a temperature gradient is examined using a simple research method. The results are compared with those obtained from isothermal tests. The transport properties are identified as being dependent on the temperature gradient across…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSupramolecular Cylinder and Sphere Generating Thermotropic Hexagonal Columnar and Spherical Micellar Liquid Crystalline Assemblies in Coil−Rod−Coil Block MoleculesMyongsoo Lee, Dong-Woo Lee, Byoung-Ki Cho, Ju-Young Yoon, and Wang-Cheol ZinView Author Information Depart…
It is generally recognized that proper quantification of microstructural behavior is necessary for the optimization of materials properties. In the specific case of polycrystalline thin films, transmission electron microscopy (TEM) is required for microstructural interrogation due to the small (nm–μm) inherent length…
Abstract 3,4′-Bis(4,5-dihydro-4,4,5,5-tetramethyl-3-oxido-1-oxyl-3-imidazolio-2-yl)azobenzene (1) was synthesized starting from 3,4′-dimethylazobenzene via the diformyl derivative. Biradical 1 crystallized as dark blue-green needles; its crystal structure was determined by the X-ray crystallography. X-band ESR spectra…
Low energy electron microscopy (LEEM) has developed into one of the premier techniques for in situ studies of surface dynamical processes, such as epitaxial growth, phase transitions, chemisorption and strain relaxation phenomena. Over the last three years we have designed and constructed a new LEEM instrument, aimed…
We investigate and characterize the newly grown crystal Li2B4O7 which is transparent down to 160 nm for nonlinear optical conversion into the vacuum ultraviolet using sum frequency mixing with femtosecond pulses. This material exhibits excellent properties below 180 nm and makes possible the generation of wavelengths…
Surface modification of a layered silicate, magadiite, with a perfluoroalkylchlorosilane, [2-(perfluorohexyl)ethyl]dimethylchlorosilane, was conducted for the first time. By utilizing the dodecyltrimethylammonium-magadiite as the intermediate, a fluoroalkylsilyl group has successfully been introduced into the interlay…
Characteristic photostimulated luminescence (fluorescence) in the visible range is reported from theta transition alumina prepared by using a variety of methods. The luminescence is associated with trace concentrations of chromium and can be intensified by intentional chromium doping. The luminescence from theta‐alumi…
Abstract Gas phase selective oxidation of propylene to propylene oxide (PO) or propionaldehyde (PA) in the presence of H2 and O2has been carried out with a propylene conversion in the range of 0.5-3.7% over gold deposited on titanosilicates by deposition-precipitation (DP) method; PO was obtained with a selectivity ab…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSubstrate Binding to the α-Ketoglutarate-Dependent Non-Heme Iron Enzyme Clavaminate Synthase 2: Coupling Mechanism of Oxidative Decarboxylation and HydroxylationJing Zhou, Michele Gunsior, Brian O. Bachmann, Craig A. Townsend, and Edward I. SolomonView Author Informati…
We present a detailed study of the activated resistivity of ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ films up to 600 K under the influence of high magnetic fields. Data in zero field can be explained by small polaron hopping as treated in the Friedman-Holstein theory. Based on the spin orientation…
The synthesis of dendrimers including P N−P S linkages specifically placed at some generations within the dendrimeric architecture allows the grafting of several types of functional groups at site- and depth-specific locations in the internal layers. The synthesis is carried out up to the fourth generation starting fr…
Continuous highly-ordered mesostructured lamellar-phase thin films are formed by a rapid dip-coating method. The films are made by a dip-coating process from a sol consisting of tetraethoxysilane and the surfactant sodium dodecyl sulfate (SDS). XRD patterns give sharp peaks extending to 14 orders, indicative of a high…
We have studied the molecular mobility of the water and carbohydrate protons in maltose samples as a function of water content and temperature using 1 H NMR. In the NMR signal, slow decaying and fast decaying fractions of protons are distinguished as arising from mobile and immobile (τ c > 3 μs) protons, respectively.…
Electronic and magnetic properties of the perovskitelike compounds of $({\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Dy}}_{x}{)}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3} (0<~x<~0.5)$ have been studied by measuring electrical resistivity, magnetic susceptibility, magnetization, and magnetoresistance. All the compou…
Measurements of both components of the complex ac conductivity ${\ensuremath{\sigma}}_{m}^{*}(\ensuremath{\varphi},\ensuremath{\omega})$ on continuum percolation systems, based on graphite and boron nitride (G-BN), between 30 Hz and 100 MHz are reported. The results for the real part of ${\ensuremath{\sigma}}_{m}^{*}(…
One-dimensional (1D) structures with nanometer diameter are expected to have remarkable properties that are in principle tunable by varying the diameter and chirality. Most previous research on 1D materials concentrated on carbon-based nanomaterials and require extreme preparation conditions. Here the authors report a…