Materials Literature
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Surface modifications of emeraldine base (EB) films have been carried out via thermally induced graft copolymerization with acrylic acid (AAc), sodium salt of styrenesulfonic acid (NaSS), N, N‘ -dimethyl(methacryloylethyl)ammonium propanesulfonate (DMAPS), and acrylamide (AAm). The structure and chemical composition o…
Abstract Novel biodegradable regular poly(ester urethane)s 2 (η red ≤ 0,62 dL/g) were synthesized for the first time by polycondensation of di‐ p ‐toluenesulfonic acid salts of bis(phenylalanine) α,ω‐alkylene diesters 1 with di‐ p ‐nitrophenyl trimethylenedicarbonate (4) under mild conditions in organic solvents in th…
Silica–polyimide hybrid composites were prepared via a sol–gel process and thermal imidization. Two different types of soluble precursors, poly(amic acid) (PAA) and poly(amic diethyl ester) (ES), chemically convertible to poly(p-phenylene biphenyltetracarboximide), were used as organic polymer matrix component, and te…
Crystal structures of magnetite ( Fe 3 O 4 ) and Ni-ferrites ( Ni 0.4 Fe 2.6 O 4 and Ni 0.6 Fe 2.4 O 4 ) were determined using X-ray single-crystal diffraction methods. The single crystals were grown hydrothermally at 673–743 K, and some of the crystals were heated at 1303 K. After the positional and thermal parameter…
The electrical properties of oligoresorcinols with various concentrations of paramagnetic centres (Ns) in constant and variable electric fields have been investigated. It has been established that the electrical conductivity and the tangent of the dielectric loss angle are increased with the growth of Ns in the compos…
As power sources for rehabilitation equipment, electric, hydraulic, and pneumatic actuators have been used. However a more human-sized and higher powered actuator that can reduce the equipment size is desired. A new metal hydride (MH) actuator that uses the reversible reaction between the heat energy and mechanical en…
Abstract This paper is a review of Resorcinol bis(diphenyl phosphate) (RDP), a non‐halogen aromatic oligomeric phosphate flame‐retardant and flow modifier. Its high thermal stability and low volatility, compared with the triaryl phosphates, make it ideal for use in applications where high processing temperatures are r…
Fully conjugated and soluble polyazomethines were synthesized by the polycondensation of aromatic dialdehydes with two kinds of diamines having a tetraphenylethylene structure, cis - and trans -1,2-bis(4-aminophenyl)-1,2-diphenylethylene ( 4a and 4b ). The structures of these diamines were determined using NMR and sin…
Malonate decarboxylase of Klebsiella pneumoniae consists of four different subunits and catalyzes the conversion of malonate plus H+ to acetate and CO2. The catalysis proceeds via acetyl and malonyl thioester residues with the phosphribosyl-dephospho-CoA prosthetic group of the acyl carrier protein (ACP) subunit. From…
Abstract In the Tertiary lacustrine sediments of the Jbel Rhassoul (Morocco), stevensite and sepiolite, confined to the dolomitic facies, are commonly mixed at lower parts of the so-called “Formation Intermédiaire”. Transmission electron microscopy (TEM) observations reveal a relation between these 2 magnesian clay mi…
Abstract The crystal structure of averievite, Cu 5 O 2 (VO 4 ) 2 ·n MX has been determined. Trigonal system, space group P 3, a = 6.375(1), c = 8.399(1) Å, V = 295.6(1) Å 3 , Z = 1, D x = 4.01(1) g/cm 3 . The atomic arrangement is characterized by infinite nets parallel to (001) composed of [OCu 4 ] 6+ tetrahedra link…
Abstract The thermal stability of poly( L ‐lactide) and L / D ‐lactide stereocopolymers polymerized in bulk with aluminium isopropoxide as initiator was investigated by thermogravimetric analysis, and time and temperature dependence of molecular weight and polydispersity. Compared to poly( L ‐lactide) prepared with st…
Current leads, which connect superconducting magnets at the liquid helium temperature and power supplies at the room temperature, are the major source of heat leaking into cryostats, and therefore largely determines the running cost of magnet systems. Heat leak can be reduced by using high-temperature superconductors…
The slowing down of energetic particles in solids has been studied for the special but important case that the energy loss process is independent of any other interaction characteristic. For a realistic variation of the scattering characteristics with energy this allows one to go over from the continuous energy variab…
Ferromagnetic resonance measurements were made as a function of the static external field angle for c-plane disks of single crystal flux grown manganese substituted barium M-type (Ba-M) and zinc Y-type (Zn-Y) hexagonal ferrites at 50 and 8.8 GHz, respectively. A shorted waveguide technique was used. Analysis of the FM…
Carbon diffuses into metal and recrystallizes as graphite, which is termed graphitization of carbon by metal. This study has revealed that the temperature at which this graphitization occurs depends on the initial state of the carbon. The lowest temperatures at which graphitization by Ni occurs for diamond, diamondlik…
Detailed voltammetric studies are reported of the reduction of alpha-[S(2)Mo(18)O(62)](4)(-) at glassy carbon and platinum macro- and microdisk electrodes (stationary and rotated) in acetonitrile and in 95/5 acetonitrile/water mixtures containing 0.02 M perchloric acid. Experiments at -30 degrees C and at short time s…
Wide-angle X-ray diffraction patterns of single spider-silk fibres of ≤ 5 μm diameter can be obtained at a third-generation synchrotron-radiation source in a few seconds per pattern. This is sufficient to observe the strongest equatorial and first layer line reflections. For higher-resolution structural work, data hav…
Abstract The crystal structures of IrAl 2.75 (“Ir 2 Al 5 ”) and RhAl 2.63 (“Rh 2 Al 5 ”) phases have been studied with single crystal methods: space group P 23, IrAl 2.75 , a = 7.674(1) Å, Z = 8, R F = 0.053 (457 hkl , 29 parameters) and RhAl 2.63 , a = 7.6692(1) Å, R F = 0.042 (684 hkl , 29 parameters). The unit cell…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTOn the Landau−Brazovskii Theory for Block Copolymer MeltsI. W. Hamley and V. E. PodneksView Author Information School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K. Cite this: Macromolecules 1997, 30, 12, 3701–3703Publicatio…