Materials Literature
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A series of cellobiose octaalkanoates, Cel-II-n (n is the carbon number of the alkyl chain), with n = 7–14 were prepared and their mesogenic properties examined by differential scanning calorimetry, optical polarizing microscopy and X-ray diffraction. All of these compounds form enantiotropic discotic columnar phases,…
Having generated and identified a carbon thirteen NMR signal arising exclusively from PC chains the PC/PS interface, we can now perform NMR relaxation experiments to characterize the microscopic dynamics of these chains. A difference pulse sequence is used which includes a period for carbon dephasing under the influen…
Abstract In the copper deposit of Salobo 3A (Brazil), nontronite-like clay samples were found at the bottom of the weathering blanket. Samples were fractionated first by sedimentation and then by a HGMS method. From XRD data, it was found that the samples are essentially smectite with kaolinite in very small quantitie…
Cation order among the octahedral sites of three polycristalline 29 Si-enriched garnet s on the enstatite-pyrope join has been examined. These samples were synthsized at 17.7GPa and 2000°C. All three samples yielded 29 Si NMR peaks in the chemical shift range of -68 to -90ppm, caused by 4 Si and between -195.6 and -19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntiplasticization and abrasion resistance of polycarbonates in the charge-transport layer of an organic photoconductorR. E. Cais, M. Nozomi, M. Kawai, and A. MiyakeCite this: Macromolecules 1992, 25, 18, 4588–4596Publication Date (Print):August 1, 1992Publication History Pu…
Abstract Hydrothermal tobelitic phyllosilicates modeled as ISII (R3) ordering with a minimum of 2–3% and a maximum of 6–8% interstratified smectite occur in veins and as replacement of fossils in hydrothermally altered black shale. These heavy metal-rich phyllosilicate veins formed during a Mesozoic-aged, regional-sca…
The electromigration reliability of Cu interconnects has been studied under DC, pulse-DC, and bipolar current stressing conditions. Electroless plating was used to selectively deposit Cu in oxide trenches by using Pd silicide as a catalytic layer at the bottom of the trenches to initiate copper deposition. The DC and…
Polycondensation or step-growth polymerization systems differ from addition polymerization systems in that polymer growth occurs not just from monomer addition but from polymer-polymer reactions. Also, the reactions occurring during polycondensation often cause the production of a small molecule byproduct called a con…
Data from time-resolved optical emission spectroscopy (TROES) are presented from experiments on plasma modulation in a typical parallel-plate reactor used for the deposition of amorphous-silicon-based materials. The SiH 4 -H 2 , GeH 4 , SiF 4 and SiF 4 -H 2 systems have been investigated by varying the modulation para…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and x-ray characterization of the neutral organometallic gold cluster [Au10(C6F5)4(PPh3)5]Antonio Laguna, Mariano Laguna, M. Concepcion Gimeno, and Peter G. JonesCite this: Organometallics 1992, 11, 8, 2759–2760Publication Date (Print):August 1, 1992Publication His…
Abstract This paper aims at characterizing the morphology, texture, and microstructure of three hydrated kaolin rich clays (f < 0.2 μ m) from volcanic soils. These clays represent a weathering sequence in which CEC, halloysite content with respect to kaolinite, as well as smectite content in the halloysite-smectite…
A new approach based on the partial coherent theory of light is introduced to predict the radiative properties of a thin film. General expressions obtained for the normal reflectance and transmittance of a thin film not only degenerate into the limiting results of the wave and the geometric optics in the coherent and…
Crystal data for polymorph I are:Pn2I1a, a=14.474, b=21.953, c=8.203 A, T=294K, R=0.047. The structure of polymorph II space groupe Pbca was reported earlier. A phase transition occuring at 422-423 K has been detected.
Part I: Solid State Part II: Liquid Crystals Part III: Polymers Part IV: Interfaces Part V: Wetting and Adhesion Part VI: Chirality.
Abstract Direct radiation‐induced grafting of aqueous acrylic acid (AAc) onto poly(tetrafluoroethylene‐ethylene) (ET) film has been studied. The effect of grafting conditions such as monomer concentration, exposure dose, dose rate, and film thickness on the grafting yield was investigated. The dependence of the grafti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the chemical vapor deposition of silicon carbide from tetramethylsilane by in situ temperature and gas composition measurementsNathalie Herlin, Michel Lefebvre, Michel Pealat, and Jerome PerrinCite this: J. Phys. Chem. 1992, 96, 17, 7063–7072Publication Date…
Al 2 O 3 and SiC composite materials have been produced from mixtures of aluminosilicates (both natural minerals and synthetic) and carbon as precursor materials. These composites are produced by heating a mixture of kaolinite (or synthetic aluminosilicates) and carbon in stoichiometric proportion above 1550°C, so tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and theoretical analysis of band formation in polymeric liquid crystals upon cessation of flowS. J. Picken, P. Moldenaers, S. Berghmans, and J. MewisCite this: Macromolecules 1992, 25, 18, 4759–4767Publication Date (Print):August 1, 1992Publication History Publi…
Abstract Novel biodegradable poly(ester‐amide)s were prepared by ring‐opening copolymerization of ε‐caprolactone and 3‐ and/or 6‐alkyl‐substituted morpholine‐2,5‐dione derivatives. The copolymerizations were carried out in the bulk using stannous octoate as an initiator. Molecular weights of the copolymers ranged from…
The external complex ac susceptibility ${\mathrm{\ensuremath{\chi}}}_{\mathrm{e}}$=${\mathrm{\ensuremath{\chi}}}_{\mathrm{e}}^{\ensuremath{'}}$-j${\mathrm{\ensuremath{\chi}}}_{\mathrm{e}}^{\mathrm{\ensuremath{''}}}$ of a spherical ${\mathrm{Nd}}_{2}$${\mathrm{Fe}}_{14}$B single crystal has been measured as a function…