Materials Literature
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What are carbon-carbon composites and what do they offer, C. Thomas the importance of fibre type and fibre surface in controlling composite properties, E. Walker matrix precursors for carbon-carbon composites, B. Rand manufacturing considerations for carbon-carbon, R. Fisher multidirectional reinforced carbon-carbon,…
We present the analysis of static properties of a simple phenomenological model of antiferroelectric liquid crystals, capable of explaining some different sequences of phase transitions found experimentally. Stability analysis shows the existence of three simply modulated phases. Results are summed up in phase diagram…
Since their discovery in 1984, several thousand papers have been published dealing with various aspects of quasicrystals. Despite this flurry of activity, questions concerning the development, structure, and physical properties of this new phase remain only partially answered. This article reviews investigations of th…
Raman scattering has been carried out on PbTiO3 thin films prepared on platinum-coated (100) silicon by radio-frequency (rf)-magnetron sputtering without substrate heating and a post-deposition thermal treatment. The Raman spectra obtained from the thin film are characteristic of powder Raman spectra: In comparison wi…
In this paper we collect and detail recent results concerning 77Se and 13C nuclear relaxation rate measurements obtained on several representatives of the (TMTSF)2X and (TMTTF)2X series of charge transfer salts as a function of temperature and hydrostatic pressure. From the temperature and pressure dependences of T-11…
Many species of bacteria have been found to form fractal colonies. Environmental (physicochemical) and biological factors for this fractal morphogenesis have been examined for their roles in the genesis of fractal and pattern diversity. Morphology of a bacterial colony on a solid agar medium depends on the nutrient di…
Atomistic simulation techniques are used to model a range of sulfates. Two widely different sets of potentials have been developed. The first is based on shell model, electron-gas potentials; the second is a rigid ion model which treats inter- and intra-molecular forces differently. The success of the potential models…
The structural, material and electro-optical properties of novel, halogenated nematic liquid crystals which contain quite different functional groups are correlated. Synergisms which lead to broad mesophases, low viscosities and large dielectric anisotropies further improve the performance of actively and passively ad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComputer-aided comparative investigation of architecture influence on block copolymer phase diagramsA. V. Dobrynin and I. Ya. ErukhimovichCite this: Macromolecules 1993, 26, 2, 276–281Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Publi…
The relationship between a composite and its constituents with respect to high‐temperature deformation behavior was investigated using the Al 2 O 3 ‐Y 3 Al 5 O 12 (YAG) eutectic system. The eutectic is essentially a composite with sapphire and YAG as the two phases with a volume fraction of YAG of 0.45. The deformatio…
Thermodiffusion, the cross coupling between temperature and concentration, is studied in dilute polymer solutions by forced Rayleigh light scattering. First a spatial temperature grating is created within the solution by absorption of an optical interference grating and subsequently a concentration grating builds up.…
In this perspective, some of the general phenomena associated with liquid-crystal behaviour are introduced before selective consideration is given to the effect which a metal can have when it forms part of a liquid-crystalline molecule.
A 3-D model of a protein can be constructed from its amino acid sequence and the 3-D structures of one or more homologues by annealing three sets of fragments: the structurally conserved regions, structurally variable regions and the side chains. The method encoded in the computer program COMPOSER was assessed by gene…
Abstract
Alkali-mediated reaction of 5,10,15,20-tetrakis(3′,5′-dihydroxyphenyl)porphine with dendritic bromide gives the novel porphyrin covalently encapsulated into a huge dendritic cage (‘caged’ porphyrin).
The geometry of gold–gold interactions in a group of 693 gold-containing crystal structures has been examined using data from the Cambridge Structural Database. These contacts occur in the range 2.50–4.00 Å. Intermolecular Au ⋯ Au contacts are formed by compounds of the type AuXY (X, Y = any element) with the X-Au–Au-…
Experimentally measured second-order nonlinear hyperpolarizability (βµ) data for a new series of donor-acceptor conjugated compounds containing tricyanovinyl acceptors and thiophene conjugating units, reveal that this combination results in a dramatic enhancement (αµ= 6000–9000 × 10–48 esu) of their molecular nonlinea…
Facile alkoxylation of 4′-chloro-2,2′ :6′,2″-terpyridine with the mono- and tri-hydroxylic cascade (dendritic) building blocks, 4-(3-hydroxypropyl)-4-(3-benzyloxypropyl)-1,7-bis(benzyloxy)heptane 4 and 4-amino-4-(3-hydroxypropyl)heptane-1,7-diol 3, has allowed the synthesis of a dodecaruthenium macromolecule 11 employ…
Conventional small-molecule methods of solving the phase problem from native data alone, without the use of heavy-atom derivatives, known fragment geometries or anomalous dispersion, have been tested on 0.9 A resolution data for two small proteins: rubredoxin, from Desulfovibrio vulgaris, and crambin. The presence of…
The four redox steps between the dication and the dianion of didodecylsexithiophene 1, a soluble oligothiophene with defined structure and chain length, were studied by a combination of in situ UV/VIS/near IR and ESR spectroscopy. The reversible dimerization 1˙+ → (1) provides a new description of the doping behavior…