Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of 2-(alkanoyloxy)-5-alkoxytropones. Novel monocyclic rod-type liquid crystalsAkira Mori, Hitoshi Takeshita, Katsuhiko Kida, and Minoru UchidaCite this: J. Am. Chem. Soc. 1990, 112, 23, 8635–8636Publication Date (Print):November 1, 1990Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence-based correlation of semiconductor electric field thickness with adsorbate Hammett substituent constants. Adsorption of aniline derivatives onto cadmium selenideCatherine J. Murphy, George C. Lisensky, Larry K. Leung, Glen R. Kowach, and Arthur B. EllisCite…
Thermal analysis was performed on coprecipitated materials and on individual components. The detailed decomposition schemes of coprecipitates and individual components are proposed and discussed. According to the proposed decomposition schemes, the values of the observed weight loss are in good agreement with those of…
The composition and structure of boron nitride films prepared by thermal and plasma enhanced chemical vapor deposition (CVD) using borazine as a precursor have been studied. Thermal CVD at temperatures between 475 and 550 °C using either a hot-wall or cold-wall reactor results in amorphous boron-rich films of approxim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel synthetic route to scandium porphyrin derivatives and the first structurally characterized metalloporphyrin-.eta.5-cyclopentadienyl sandwich compoundJohn Arnold and Caroline G. HoffmanCite this: J. Am. Chem. Soc. 1990, 112, 23, 8620–8621Publication Date (Print):Novem…
The implications of a self-consistent mode-coupling theory of dense fluids for the liquid-glass transition are considered. First, we show that when higher-order corrections are ignored from our model, there is a dynamic transition of the hard-sphere fluid at an intermediate density to an ideal glassy phase. This is in…
Micrometer size polydispersed spheres of zirconia were produced via electrostatic atomization and pyrolysis of aqueous zirconium acetate‐yttrium acetate precursors. Varying the precursor composition in the ZrO 2 ‐rich region of the ZrO 2 ‐Y 2 O 3 binary system resulted in the production of either single‐crystal (0 and…
Abstract Spherulitic growth rates and overall rates of crystallization of poly(ε‐caprolactone‐co‐ε‐methyl‐ε‐caprolactone), poly(CL‐co‐MCL), were analyzed over a composition range from pure poly (ε‐caprolactone) (PCL) to a copolymer containing 40% MCL with an equation which contains the classical nucleation and transpo…
The size of Pt particles introduced into the channels of ZSM-5 zeolite by two different preparation methods has been studied\nwith EXAFS. ZSM-5 was loaded with 2 wt 5% Pt by ion exchange and by impregnation. By careful calcination of the catalysts\nthe dispersion was maintained. The EXAFS measurements were performed o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of third-order optical nonlinearities of model compounds containing benzothiazole, benzimidazole and benzoxazole unitsMingtang Zhao, Marek Samoc, Paras N. Prasad, Bruce A. Reinhardt, Marilyn R. Unroe, Mark Prazak, Robert C. Evers, James J. Kane, Chetan Jariwala, and…
The performance of miniaturized electron optical systems comprising a field emission microsource and a microlens for probe forming has been studied. A complete system measuring millimeters in length and diameter with performance exceeding that of a conventional system over a wide range of potentials (100 V–10 kV) and…
We derive the phase diffusion and mean drift equations for the Oberbeck–Boussinesq equations in large-aspect-ratio containers. We are able to recover all the long-wave instability boundaries (Eckhaus, zigzag, skew-varicose) of straight parallel rolls found previously by Busse and his colleagues. Moreover, the developm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox properties of porphycenes and metalloporphycenes as compared with porphyrinsJean Paul Gisselbrecht, Maurice Gross, Matthias Koecher, Michael Lausmann, and Emanuel VogelCite this: J. Am. Chem. Soc. 1990, 112, 23, 8618–8620Publication Date (Print):November 1, 1990Publica…
Ferroelectric liquid crystalline (LC) polymers (see figure), which in the smectic C* phase exhibit the highest yet known spontaneous polarization for LC polymers of up to 430 nC/cm 2 , a value which approaches that of the best low molecular weight materials, have been synthesized, based on chiral polysiloxanes. A copo…
Abstract Iron and manganese tetramethylporphine (TMP) complexes were synthesized within the cages in NaY zeolite. The ligation of porphine to the metals enhanced the capability of ion-exchanged zeolite to oxidize saturated hydrocarbons with hydrogen peroxide.
The formation of the riboflavin precursor, 6,7-dimethyl-8-ribityllumazine, from 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione requires a phosphorylated 4-carbon intermediate which has been designated as Compound X (Neuberger, G., and Bacher, A. (1985) Biochem. Biophys. Res. Commun. 127, 175-181). The enzyme cataly…
This paper is an overview of studies performed at the IBM Thomas J. Watson Research Center on diamondlike carbon (hydrogenated amorphous carbon) films, including some recent results on their tribological properties. The films were prepared by rf plasma-assisted chemical vapor deposition (PACVD) from acetylene. Their s…
An intense source of positive, negative, and neutral carbon clusters using excimer laser ablation of polyimide is described. The detection probability for large masses using a standard channel plate configuration is shown to increase exponentially with ion velocity. The large clusters are formed via aggregation of ato…
Total-energy band calculations using the local-spin-density approximation, the augmented-spherical-wave method, and the fixed-spin-moment procedure are used to investigate the volume dependence of the magnetic and electronic properties of 3d transition metals constrained to cubic environments in one-atom or two-atom u…
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