Materials Literature
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Ytterbium metal reacts with PhEEPh (E = S, Se, Te) and elemental Se in pyridine to give (pyridine)(8)Yb(4)(SeSe)(2)(Se)(2)(mu(2)-SPh)(2)(SPh)(2), (py)(8)Yb(4)Se(SeSe)(3)(SeSeSePh)(Se(0.38)SePh), and (py)(8)Yb(4)Se(SeSe)(3)(SeSeTePh)(SeTePh), respectively. The SePh and TePh compounds contain a square array of Ln(III) i…
The electrodeposition of polysiloxane precursor polymers to form cross-linked conjugated polythiophene ultrathin films is described. The precursor polymer contains a polysiloxane backbone with pendant electroactive thiophene monomer units synthesized via a hydrosilylation reaction. The thiophene units were electropoly…
Geranylgeranylglyceryl diphosphate synthase (GGGP synthase) catalyzes alkylation of (S)-glyceryl phosphate [(S)-GP] by geranylgeranyl diphosphate (GGPP) to produce (S)-geranylgeranylglyceryl phosphate [(S)-GGGP]. This reaction is the first committed step in the biosynthesis of ether-linked membrane lipids in Archaea.…
Electrochromic devices composed of laminated polymer layers, as the working electrode, and vanadium pentoxide, as the counter electrode, were prepared and evaluated. Three different laminate systems were investigated using various combinations of poly(3,4-ethylenedioxythiophene), poly( N -methylpyrrole), and polyanili…
Abstract The β‐crystalline form of isotactic poly(propylene) (PP) has been long recognized to have a greater mechanical absorption capacity than the α‐crystalline form. This is of major importance for improving impact properties and crack resistance of injection‐molding parts. Unfilled PP samples together with calcium…
Abstract Environmental stress cracking (ESC) in poly(methyl methacrylate) under different humidity conditions has been investigated. Constant stress‐intensity factor ( K ) ring‐type specimens were prepared, and all specimens were equilibrated at five different humidity conditions for about two years. ESC tests were ca…
The imidization behavior and structural evolution in a microscaled film of poly(3,4‘-oxydiphenylene pyromellitamic acid) precursor are studied by time-resolved synchrotron wide-angle X-ray diffraction and infrared spectroscopy to investigate the relationship between thermal imidization and structural evolution in the…
The application of high intensity ultrasound to liquids leads to cavitation. In contrast to the homogeneous situation this is poorly understood close to a surface despite the implications for many biological, chemical, and physical applications. By using ultrafast electrochemical equipment and arrays of electrodes, we…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembly of Unlike Homopolymers into Hollow Spheres in Nonselective SolventHongwei Duan, Daoyong Chen, Ming Jiang, Wenjun Gan, Shanjun Li, Min Wang, and Jie GongView Author Information Department of Macromolecular Science and The Key Laboratory of Molecular Engine…
A relatively new technique based on the sequential adsorption of oppositely charged polymers affords the fabrication of multilayer thin films with controlled molecular architectures. In this work, we report the first study on the impedance and dielectric characteristics of multilayer films created by the sequential ad…
We use a tight-binding total energy method, with parameters determined from a fit to first-principles calculations, to examine the newly discovered gamma phase of titanium. Our parameters were adjusted to accurately describe the alpha Ti-omega Ti phase transition, which is misplaced by density functional calculations.…
We propose a unified moving boundary problem for surface growth by electrochemical and chemical vapor deposition, which is derived from constitutive equations into which stochastic forces are incorporated. We compute the coefficients in the interface equation of motion as functions of phenomenological parameters. The…
This paper, based on a presentation at the Spintronics 2001 conference, provides a review of our studies on II-VI and III-V Mn-doped Diluted Magnetic Semiconductors. We use simple models appropriate for the low carrier density (insulating) regime, although we believe that some of the unusual features of the magnetizat…
We have studied growth and properties of quaternary alloy magnetic semiconductor (InGaMn)As grown both on GaAs substrates and on InP substrates by low-temperature molecular-beam epitaxy (LT-MBE). (InGaMn)As thin films were ferromagnetic below ~30 K, exhibiting strong magneto-optical effect. The lattice constant of [(I…
Unilamellar titania crystallites of Ti 1- δ O 2 4 δ - ( δ = 0.0875) and polydiallyldimethylammonium chloride have been alternately deposited layer-by-layer onto various substrates from their aqueous media. An atomic force microscopy (AFM) image visualized the adsorbed nanosheets, which gave efficient coverage of the s…
We demonstrate logic circuits with field-effect transistors based on single carbon nanotubes. Our device layout features local gates that provide excellent capacitive coupling between the gate and nanotube, enabling strong electrostatic doping of the nanotube from p-doping to n-doping and the study of the nonconventio…
A theoretical expression giving the collision-induced hyper-Rayleigh (CI HR) spectrum due to pairs of centrosymmetric molecules of octahedral symmetry has been derived. The dipole2-quadrupole hyperpolarizability light scattering mechanism of collision-induced hyperpolarizability ΔβLM is discussed in detail and propose…
Gelator-catalyst interactions allow the transcription of the organogel structure of methyl-4,6-O-(p-nitrobenzylidene)-alpha-D-glucopyranoside (1) into its silica analogue, even in the absence of positive charges or H-bonding sites on the gelator molecule which, until now, were considered indispensable.
A hierarchically structured composite ion conductor film (AgI nanorod/γ-Al2O3) was chemically prepared using nanoporous anodic aluminium oxide (AAO) as a template, where ion conducting AgI nanorods (av. diameter = 75 nm) are periodically aligned within a hexagonally organized insulating Al2O3 matrix.
The first polyoxomolybdenum carbonate has been synthesized and its single crystal structure as well as its IR, UV-vis and 13C NMR spectra have been determined.