Materials Literature
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Using the evanescent-wave ellipsometry technique, we have observed the growth of a disordered liquid-crystal layer adjacent to a ${\mathrm{SiO}}_{\mathit{x}}$-coated surface near the nematic-isotropic transition. We have also observed the pretransitional growth of a planar-oriented liquid-crystal layer in the isotropi…
NMR study of mullite precursors has shown that local arrangement of Al in samples synthesized by spray pyrolysis differs considerably from the one adopted by samples obtained by polymeric or colloidal routes. Aluminum is tetra‐ and pentahedrally coordinated in the first type of samples but is tetra‐ and octahedrally c…
Abstract Methyl-substituted derivatives of 1,3,5-tris(diphenylamino)benzene (TDAB) are found to show unique solid-state morphology, as characterized by differential scanning calorimetry and X-ray diffraction. These compounds readily form stable amorphous glasses having glass-transition temperatures of ca. 50 °C. p-Met…
The 13 major enzymes which compose the glycolytic and fermentative pathways in Zymomonas mobilis are particularly abundant and represent one-half of the soluble protein in exponential-phase cells. One- and two-dimensional polyacrylamide gel electrophoresis maps were developed for 12 of these enzymes. Assignments were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of neutron reflection and spectroscopic ellipsometry for the study of the interface between miscible polymer filmsBryan B. Sauer and David J. WalshCite this: Macromolecules 1991, 24, 22, 5948–5955Publication Date (Print):October 1, 1991Publication History Published onlin…
We present the analysis of experimental results on second-harmonic generation in a novel ferroelectric liquid crystal (FLC) material, o- nitroalkoxyphenyl biphenylcarboxylate 1, synthesized specifically for large nonlinear coefficients. All nonzero dij coefficients have been measured, with the largest being d22 = 0.6…
The surface-stabilized ferroelectric liquid crystal (SSFLC) effect is a serious candidate for application in television displays, due to its high switching speed and viewing angle independence. For the television application, however, several severe requirements must be fulfilled, of which the demand for a large amoun…
Zirconia as well as yttria‐zirconia and calcia‐zirconia solid‐solution powders were crystallized under hydrothermal conditions from (co)precipitated hydroxides. The morphology of the powder particles is strongly dependent on the crystallization conditions. The powders crystallized in a water solution of Na, K, and Li…
Abstract Liquid‐crystalline polymers with mesogenic groups in the main chain and side chains as well as their networks are studied by the dynamic mechanical method. The homopolymers are compared with chiral copolymers of a similar chemical structure. Mechanical relaxation transitions are correlated with transitions ob…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of the wavelength and potential dependence of surface enhanced Raman scattering on copper, silver, and gold electrodesBruce Chase and Bruce ParkinsonCite this: J. Phys. Chem. 1991, 95, 20, 7810–7813Publication Date (Print):October 1, 1991Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelationship of STM and AFM images to the local density of states in the valence and conduction bands of rhenium selenide (ReSe2)B. A. Parkinson, J. Ren, and M. H. WhangboCite this: J. Am. Chem. Soc. 1991, 113, 21, 7833–7837Publication Date (Print):October 1, 1991Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical pathways of water on palladium (111) at 6.4 eVX. Y. Zhu, J. M. White, M. Wolf, E. Hasselbrink, and G. ErtlCite this: J. Phys. Chem. 1991, 95, 21, 8393–8402Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1…
Reflectance anisotropy spectrometry is used to study the electronic properties of sulfide-passivated GaAs. The optical technique allows measurement of the Fermi-level displacement at the surface in situ, while the sample is immersed into a sulfide solution. The kinetics of the process was found to be very sensitive to…
SiC‐ and Al 2 O 3 ‐platelet‐reinforced mullite‐matrix composites were fabricated by both conventional powder processing and a pressure filtration route with constant filtration rate. Consolidation during the pressure filtration experiment was monitored as a function of time with respect to actual pressing stages. The…
This paper compares the mineralogy and chemistry of clay minerals in sediments from various depths and positions in Abert Lake and surrounding playa with those of the weathered materials entering the lake in order to reveal the nature and extent of post-depositional mineralogical modification. Analytical electron micr…
Zr–Hf interdiffusions were carried out at 1350° to 1520°C for polycrystalline tetragonal solid solutions of 14CeO 2 ·86(Zr 1‐ x Hf x )O 2 with X = 0.02 and 0.10. Lattice and grain‐boundary interdiffusion parameters were calculated from the concentration distributions by using Oishi and Ichimura's equation. Lattice int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra of boron atom-water molecule reaction products trapped in solid argonLester Andrews and Thomas R. BurkholderCite this: J. Phys. Chem. 1991, 95, 22, 8554–8560Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic behavior of noble metal/reducible oxide materials for low-temperature carbon monoxide oxidation. 2. Surface characterization of gold/manganese oxideSteven D. Gardner, Gar B. Hoflund, Mark R. Davidson, Herbert A. Laitinen, David R. Schryer, and Billy T. UpchurchCite…
Mullite ceramics were fabricated according to the recently developed reaction‐bonded Al 2 O 3 (RBAO) technology. Green compacts consisting of mechanically alloyed Al, SiC, and Al 2 O 3 were heat‐treated in two steps. During the first hold at 1200°C, Al and SiC were oxidized to form Al 2 O 3 and SiO 2 . On further heat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and spectroscopic and magnetic properties of a unique diamagnetic binuclear .mu.-oxo vanadium(IV) complex. Crystal structure of [(tpa)VO(.mu.-O)VO(tpa)](ClO4)2 (tpa = tris(2-pyridylmethyl)amine)Hans Toftlund, Sine Larsen, and Keith S. MurrayCite this: Inorg. Chem.…