Materials Literature
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Three series of novel chiral twin liquid crystals consisting of a cholesteryl and a 4′-cyanobiphenyl-4-yloxy group (III) or a 4-cyanophenoxy group (IV) and of a dihydro-cholesteryl and a 4′-cyanobiphenyl-4-yloxy group (V) connected by an alkanoate spacer with a varying number (1–7 and 10) of methylene units were synth…
The aging mechanism of mica/epoxy insulations under multiple stresses is investigated with both breakdown tests and a scanning electron microscope (SEM). The result of simultaneous multistress testing shows that thermal and mechanical stresses have a synergistic effect on electric life. Similar results are also obtain…
Oxidation‐state selective modified electrodes based on tetraruthenated nickel porphyrin (see Figure) thin films are reported. The films are prepared by dip coating and are highly homogeneous and adherent, exhibiting a well‐controlled electrochemical and photoelectrochemical response. The films simulate a rectifying ju…
A perfect general purpose standard specimen for high accuracy line-profile analysis is shown to be an illusion. Balancing the partly contradictory requirements, an optimum standard specimen for a parafocusing diffractometer is developed. To obtain the optimum standard specimen, a 5–10 μ m particle size fraction is tak…
The Zacapu basin, Michoacán, Mexico, is one of a series of internally drained lake basins in the central highlands of Mexico. The basin has a history of occupation spanning at least 2000 years and before the arrival of the Spanish was a major centre for the Purépecha culture. Results are presented of diatom studies fr…
Angle-dispersive powder-diffraction techniques utilizing an image-plate area detector and synchrotron radiation have been used to study the phase transitions in CdTe above 8 GPa. The well-known phase transition at 10 GPa is not to the \ensuremath{\beta}-tin structure as has previously been reported, but to an orthorho…
It is well known that the existence and accumulation of space charge in insulation can be harmful to polymer power cable. Although there is much research done on space charge distribution in various samples, there are still some important problems left unsolved, such as the mechanism of formation and elimination of sp…
Experimental evidence is given for the existence of two types of optically anisotropic gels prepared from mixtures of liquid-crystalline monomers and nonreactive liquid crystal (LC). In type 1 gels, the polymer network is present as an irregular mesh of fine fibrils within the LC. In type 2 gels the liquid crystal is…
The Raman spectra of diamond and chemical-vapor-deposition (CVD) diamond films in the UV have been excited within the diamond band gap at 228.9 nm for the first time. The lack of fluorescence in the UV-excited Raman spectrum of diamond and CVD diamond films allows Raman spectroscopy to monitor the carbon-hydrogen (C-H…
Abstract Surfaces have a profound effect on the structure and related properties of multiphase polymeric materials, such as polymer mixtures and block copolymer mesophases. In particular, phase transitions in the bulk (unmixing, microphase separation, etc.) may be complemented by surface‐induced transitions (formation…
Summary Proto‐imogolite sols can be considered as highly dispersed forms of proto‐imogolite allophane, the most widespread type of allophane in volcanic and non‐volcanic soils world‐wide. The solubility characteristics of such sols define the conditions of precipitation of allophanes in soils, and the maximum concentr…
With a view to the application of magnetic particles in cancer thermotherapy (hyperthermia), methods of preparing a bio-applicable magnetite with targeting activity towards cancer cells were investigated, and the properties of the material examined. Poly(ethylene glycol) (PEG)-magnetite consisting of magnetite (Fe3O4)…
By means of photo alignment and simultaneous cross-linking of linearly photopolymerizable (LPP)-polymers we have succeeded in generating uniaxial planar alignment in adjacent liquid crystal polymer (LCP)-films deposited on single LPP-substrates. It became thus possible to design optically anisotropic and photopatterna…
Abstract The thermodynamic parameters for solution of hydrogen at infinite dilution and the (a+B) plateau thermodynamic properties for hydrogen absorption at moderate temperatures for a series of Pd‐based f.c.c binary alloys with relatively low solute metal content have been correlated from the viewpoint of whether th…
Linear, paraelectric (Pb 0.72 La 0.28 )TiO 3 or PLT(28) thin films with a bandgap>3 eV were deposited on Pt/Ti/SiO 2 /Si substrates by the sol-gel technique. Specific top-contact metals from two distinct groups (i.e., non-noble or M T and noble or M N ; the former being oxidizable transition metals) were selected t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRecent Advances in the Physical and Spectroscopic Properties of Polypyrrole Films, Particularly Those Containing Transition-Metal Complexes as CounteranionsBrian R. Saunders, Robert J. Fleming, and Keith S. MurrayCite this: Chem. Mater. 1995, 7, 6, 1082–1094Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLaser-Induced Luminescence Studies and Crystal Structure of the Europium(III) Complex of 1,4,7,10-Tetrakis(carbamoylmethyl)-1,4,7,10-tetraazacyclododecane. The Link between Phosphate Diester Binding and Catalysis by Lanthanide(III) Macrocyclic ComplexesShahid Amin, David A.…
(sup13)C nuclear magnetic resonance spectroscopy and (sup1)H nuclear magnetic resonance spectroscopy were used to identify and quantify the organic solutes of several strains of halophilic or halotolerant thermophilic bacteria. Two strains of Rhodothermus marinus and four strains of "Thermus thermophilus" grown in com…
Abstract The structure and physical properties of optically active, metal‐free 2,3,9,10,16,17,23,24‐octa ( S ‐3,7‐dimethyloctoxy)phthalocyanine (( S )‐Pc(8,2)) are reported and compared with those of the phthalocyanine with ( R , S ) side chains (mixture of 43 stereoisomers). Unlike the latter compound, ( S )‐Pc(8,2)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Characterization of Conducting Polymer-Silica Nanocomposites by X-ray Photoelectron SpectroscopyShuichi Maeda, Michael Gill, Steven P. Armes, and Ian W. FletcherCite this: Langmuir 1995, 11, 6, 1899–1904Publication Date (Print):June 1, 1995Publication History Publish…