Materials Literature
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Abstract Triblock copolymers and pentablock terpolymers of n ‐hexyl isocyanate (H), styrene (S), and isoprene (I) of the type HSH (six samples, M n :49–163 K, weight % of H:5–59), HIH (two samples, M n :75 and 83.4 K, weight % of H:16 and 40), HSISH (one sample, M n :79.4 K, weight % of H:13), and HISIH (one sample, M…
In this paper we present the electrochemical etching characteristics of a shape memory alloy (SMA) using new electrolytes of inorganic salt in alcohol, in comparison with conventional H 2 SO 4 –methanol solution. It has become apparent that pattern etching of SMA sheets can be carried out in electrolyte solutions usin…
The initial stages of aggregation of a series of organogelator salts, prepared from n -alkylamines by the rapid in situ and isothermal (at room temperature) uptake of the neutral triatomic molecule, CO 2, have been probed by NMR spectroscopy in the nongelled liquid, chloroform- d . Evidence for specific interactions o…
A seismic-resistant member with a shape memory alloy (SMA) rod was used in an exposed-type column base as a passive damper for building structures. Horizontal and vertical loading tests on the column base with SMA anchorage were done with increasing drift amplitude to investigate the restoring force characteristics of…
Pt nanoparticles (Pt n ) and their agglomerates (Pt n ag ) were synthesized by chemical reduction methods. The mean sizes of Pt n and Pt n ag were determined to be respectively 3.4 and 400 nm using transmission electron microscopy (TEM). CO adsorption on electrodes made of the two kinds Pt nanomaterials was used as th…
We report here the synthesis and characterization of two new classes of chelating fibers, namely, (1) polymercaptopropylsilsesquioxane (PMPS) and (2) copper(II) ferrocyanide complexed with poly[1-(2-aminoethyl)-3-aminopropyl]silsesquioxane (Cu-FC-PAEAPS) fibers. These fibers were evaluated for selective removal of tra…
Abstract The copolymerization of divinylbenzene (DVB) and ethylstyrene (EtSt) was carried out at 70 and 80 °C in benzene with dimethyl 2,2‐azobisisobutyrate (MAIB) at high concentrations as initiator in the presence of methyl benzyloxyiminoacetate (MBOIA), a glyoxylic oxime ether, as a retarder. The copolymerization s…
Abstract The effects of heat treatment on the crystal structure and impact strength of poly(phenylene sulfide) (PPS) and nano‐SiO x / PPS nanocomposites were studied. The molecular weight of heat‐treated neat PPS was increased by 28% due to the crosslinking reaction that changed its crystal morphology. Also, the cryst…
The chiral recognition in the formation of hydrogen-bonded (HB) dimers of 1,6a-dihydropyrrolo[2,3-b]pyrrole derivatives as well as in their proton-transfer processes have been studied by means of ab initio calculations. The heterochiral dimers are in general the most stable ones, but amphiprotic substituents that are…
We have determined from first principles the Curie temperature in the diluted magnetic semiconductor $({\mathrm{Ga}}_{1\ensuremath{-}x\ensuremath{-}y}{\mathrm{Mn}}_{x}{\mathrm{As}}_{y})$ As alloys, where the compensation effect by As antisites is taken into account. The disorder due to random positions of Mn impuritie…
Thin epitaxial films of MnAs--promising candidates for the spin injection into semiconductors--are well known to undergo simultaneously a first-order structural and magnetic phase transition at 10-40 degrees C. The evolution of stress and magnetization of MnAs/GaAs(001), both measured quantitatively with our cantileve…
In this work, the influence of an internal electric field upon the crystallization of lysozyme and thaumatin is explored using a modified design of the gel-acupuncture setup. From a crystallographic point of view, the orientation of crystals that grow preferentially over different types of electrodes inside capillary…
A technique for automatically evaluating microbatch (400 nl) protein-crystallization trials is described. This method addresses analysis problems introduced at the sub-microlitre scale, including non-uniform lighting and irregular droplet boundaries. The droplet is segmented from the well using a loopy probabilistic g…
Shape Memory Alloys (SMA) exhibit stable superelasticity between a reverse transformation finish temperature (A<sub>f</sub>) and approximately 30°C above A<sub>f</sub>, and therefore can sufficiently work as a superelastic material for structural use in building under the temperature in a construction environment.…
Mesogens containing rod-shaped moieties as well as one disk-shaped group exhibit nematic phase behavior and are entirely miscible with rod- and disk-shaped mesogens in the nematic phase. In the phase diagram, an extra nematic phase appears at nearly equimolar disk-rod ratios, where the nematic biaxial phase has been p…
Reaction of the Keggin-type polyanion [PW11O39]7- with the tetrakis-carbene ruthenium precursor [RuLMe4Cl2] (LMe = 1,3-dimethylimidazolidine-2-ylidene), in water, results in the formation of Na4K9[(PW9O34)2(cis-WO2)(cis-RuLMe2)].23H2O, which is the first carbene derivative of a polyoxometalate. The oxidation state of…
We determine the phase behavior of hard spheres interacting with repulsive Yukawa (screened Coulomb) interaction using computer simulations. We study the effect of the hard-core diameter on the phase behavior of repulsive Yukawa particles by comparing our phase diagrams with that of repulsive point Yukawa particles. W…
Nano-laminate Ti 3 AlC 2 is a layered ternary carbide consisting of periodic planar stacking of edge-sharing Ti 6 C octahedra and close-packed Al atoms along the c -axis. Ti 3 AlC 2 has a unique combination of interesting properties that make it a promising candidate material in diverse applications. In this paper, th…
The optical transitions of a chiral, three-substituted polythiophene with an amino acid function can be tuned by interactions with synthetic peptides. The addition of a positively charged peptide with a random-coil formation will force the polymer to adopt a nonplanar conformation, and the intensity of the emitted lig…
We use experiments and molecular dynamics simulations of vertically oscillated granular layers to study horizontal particle segregation induced by a kink (a boundary between domains oscillating out of phase). Counter-rotating convection rolls carry the larger particles in a bidisperse layer along the granular surface…