Materials Literature
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Abstract Hydroaminomethylation of olefins to synthesize amines in supercritical ammonia was studied for the first time. In the presence of a bimetallic Rh‐Ir catalyst system the reaction of 1‐octene with CO, H 2 , and ammonia led to high‐yield nonylamines. The effect of various reaction conditions such as temperature…
Time-resolved photoluminescence spectroscopy and cathodoluminescence spectroscopy and imaging have been used to investigate the optical properties of oxygen- and hydrogen-terminated silicon nanowires. We have found that the red- and the blue-emission bands from these nanowires are characterized by homogeneous broadeni…
A three-dimensional microplane constitutive model utilizing statically constrained formulation with volumetric—deviatoric split is presented for shape memory alloys (SMAs). Shear stress within each microplane is described by resultant shear component on the plane. One-dimensional stress—strain laws are used for normal…
Abstract Langmuir‐Blodgett films of a cellulose derivative containing porphyrins, porphyrin‐cellulose, were fabricated in order to construct a cellulose‐based molecular photocurrent generation system. On visible light illumination of the LB monolayer film deposited on an ITO electrode, anodic photocurrents were observ…
140 Nd was produced by irradiations of CeO 2 and Pr 2 O 3 targets leading to nat Ce( 3 He, xn ) 140 Nd and 141 Pr( p ,2 n ) 140 Nd nuclear reactions. The practical yield of 140 Nd at EOB in the former reaction over the energy range of E 3 He = 33.5 → 0 MeV amounted to 3.5 MBq/μA h and in the latter reaction over the e…
Shape memory alloy hybrid composite plates are `intelligent' structures whose shape or stiffness is actively modified by embedded shape memory alloy fibers. In this work, the behavior of such structures is investigated numerically and experimentally. A finite element model which separately represents the host structur…
Abstract The preparation of self‐assembled polyaniline (PANi) microspheres via facile interfacial oxidation polymerization of aniline in the presence of DL ‐tartaric acid dopant is reported. Compared with PANis reported in the literature, the PANi prepared in this study exhibits a nanorod‐bundle morphology with except…
The statistical mechanics of simple glass forming systems in two dimensions is worked out. The glass disorder is encoded via a Voronoi tesselation, and the statistical mechanics is performed directly in this encoding. The theory provides, without free parameters, an explanation of the glass transition phenomenology, i…
Abstract Natural amorphous polymer poly(3‐hydroxybutyrate‐ co ‐4‐hydroxybutyrate) (P3HB4HB) containing 41 mol % of 4HB was blended with poly(3‐hydroxybutyrate) (PHB) with an aim to improve the properties of PHB. The influence of P3HB4HB contents on thermal and mechanical properties of the blends was evaluated with dif…
International audience
Synergieeffekt: Ein hoch kationischer sphärischer Pd12L24-Komplex trägt 24 photoresponsive Azobenzoleinheiten in seinem Innern (siehe Bild; Hülle blau, N dunkelblau, Pd gelb, O rot, C grau, H weiß; Azobenzol als Kalottenmodell). Die konzentrierten Azobenzole bieten in der Kugel eine Umgebung, deren Hydrophobiegrad rev…
The electrical polarization in an epitaxially $\mathrm{Bi}\mathrm{Fe}{\mathrm{O}}_{3}$ film grown on ${\mathrm{La}}_{2∕3}{\mathrm{Ca}}_{1∕3}\mathrm{Mn}{\mathrm{O}}_{3}∕\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ is observed to be enhanced greatly by a magnetic field at room temperature. The simultaneous ferromagnetic orde…
The surface dynamics of supported ultrathin polystyrene films with thickness comparable to the radius of gyration were investigated by surface sensitive x-ray photon correlation spectroscopy. We show for the first time that the conventional model of capillary waves on a viscous liquid has to be modified to include the…
High-throughput exploration of electrode materials is demonstrated with an epitaxial thin-film device to determine the appropriate electrode materials for a resistance random access memory. In I–V measurements, only electrode pairs containing Al showed resistance switching (see figure). The disappearance of switching…
Abstract The covalent attachment of carbon nanohorns (CNHs) to α‐5‐(2‐aminophenyl)‐α‐15‐(2‐nitrophenyl)‐10,20‐bis(2,4,6‐trimethyl‐phenyl)‐porphyrin (H 2 P) via an amide bond is accomplished. The resulting CNH–H 2 P nanohybrids form a stable inklike solution. High‐resolution transmission electron microscopy (HRTEM) ima…
Abstract Friction and wear between moving surfaces is unavoidable and is an important reason for failure of mechanical components. A wear‐resistant and low‐friction coating can prolong the lifetime of an engineered component. Here we demonstrate a new concept for the design of low‐friction nanocomposite carbide coatin…
We report the synthesis of CdS quantum dot (QD)-poly(acrylate) nanocomposites using a recently developed catalytic system where activators are generated by electron transfer for atom-transfer radical polymerization (ATRP) in a miniemulsion. The QD surface was functionalized with a tris(alkyl)phosphine, previously modi…
We study the electronic structure of gated graphene sheets. We consider both infinite graphene and finite width ribbons. The effect of Coulomb interactions between the electrically injected carriers and the coupling to the external gate are computed self-consistently in the Hartree approximation. We compute the averag…
The variability of Young's modulus (the ▵E effect) in giant magnetostrictive Terfenol-D has a significant impact on the performance and modeling of Terfenol-D transducers. In this investigation, Terfenol-D's modulus of elasticity is characterized under controlled thermal, magnetic, and mechanical loading conditions. Q…
Abstract The thermal conductivity of hemp fiber reinforced polymer composites were studied from the steady state temperature drop across samples exposed to a known heat flux. The transverse and in‐plane thermal conductivities for oriented and randomly oriented composites for different volume fractions of fiber were in…