Materials Literature
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We consider spatially discrete nonlinear diffusion equations that are similar in form to the Cahn-Hilliard and Cahn-Allen equations.Since these equations are spatially discrete, solutions exist even for negative gradient energy coefficients.In order to study these equations analytically on finite subsets of one, two a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnzymic Mediated Synthesis of Conjugated Polymers at the Langmuir Trough Air-Water InterfaceFerdinando F. Bruno, Joseph A. Akkara, Lynne A. Samuelson, David L. Kaplan, Braja K. Mandal, Kenneth A. Marx, Jayant Kumar, and Sukant K. TripathyCite this: Langmuir 1995, 11, 3, 889–…
In a decagonal quasicrystal with composition AI70Co15Ni15 two different types of superstructure have been found by electron microscopy techniques. One of these superstructures has previously been observed. The other newly characterized superstructure causes a ring-like zone of low diffraction intensities and, addition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSequence-Specific Photocleavage of DNA by an Expanded Porphyrin with Irradiation above 700 nmDarren Magda, Meredith Wright, Richard A. Miller, Jonathan L. Sessler, and Petra I. SansomCite this: J. Am. Chem. Soc. 1995, 117, 12, 3629–3630Publication Date (Print):March 1, 1995P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew kinetic model for thermal decomposition of heterogeneous materialsJose A. Caballero, Rafael Font, Antonio Marcilla, and Juan A. ConesaCite this: Ind. Eng. Chem. Res. 1995, 34, 3, 806–812Publication Date (Print):March 1, 1995Publication History Published online1 May 2002P…
The common description of the electrical behavior of a nematic liquid crystal as an anisotropic dielectric medium with (weak) ohmic conductivity is extended to an electrodiffusion model with two active ionic species. Under appropriate, but rather general conditions the additional effects can lead to a distinctive chan…
The computer simulation of two-dimensional foams allows a comprehensive description of the mechanical properties of these systems. In particular, we have calculated elastic constants and yield stress of disordered foams as functions of the gas fraction Π@, greatly improving and extending the previous results of Bolton…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Structure of Discrete Pseudotetrahedral Oxovanadium Centers Dispersed in a Silica Xerogel Matrix: Implications for Catalysis and PhotocatalysisKim Tran, Mark A. Hanning-Lee, Abhijit Biswas, A. E. Stiegman, and Gary W. ScottCite this: J. Am. Chem. Soc. 1995, 117, 9…
The photoluminescence properties of Pr(3+)-doped GeS(x)-based glasses are studied and compared with those of other sulfide and fluoride glasses. The possibility of highly pump-power-efficient fiber amplifiers based on these GeS(x)-containing glasses in the telecommunications window at 1.3microm is discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-Saturated Mesoporous MCM-41 Systems Characterized by 1H NMR Spin-Lattice Relaxation TimesEddy Walther Hansen, Ralf Schmidt, Michael Stoecker, and Duncan AkporiayeCite this: J. Phys. Chem. 1995, 99, 12, 4148–4154Publication Date (Print):March 1, 1995Publication History…
The ferroelectric switching of columnar 1,2,5,6,8,9,12,13-octakis-((S)-2-heptyloxy-propanoyloxy)dibenzo[e,l]pyr-2-heptyloxy-propanoyloxy)dibenzo[e,1]pyrene was studied in detail between 60°C and the clearing point 115°C. The switching angle (optical tilt angle) is ±24.5° up to 10V μm−1 and ±37° at higher field strengt…
Carbon fibres prepared by the catalytic decomposition of acetylene over finely dispersed cobalt, supported on amorphous silica, are often helix shaped. The structure of such carbon fibres was studied by means of various electron diffraction techniques and by electron microscopy. It was shown that the tubules are hollo…
Quenched randomness and finite size can both have substantial effects on critical behavior at phase transitions. A high-resolution ac calorimeter study has been carried out on octylcyanobiphenyl (8CB) in four silica aerogels of different porosities (mass densities \ensuremath{\rho}=0.08--0.60 g ${\mathrm{cm}}^{\mathrm…
Diamond-coated silicon field emitters were fabricated and investigated. Emission currents of few μA per tip at voltages of several hundred volts were obtained from very blunt tips with curvature radii up to 3 μm. The values of the effective work function calculated from Fowler–Nordheim plot were in the range from 0.3…
Strongly bound, closely packed self-assembled monolayers of condensed alkyltriethoxysilanes were formed on mica and other substrates with a packing density of about 20 Angstrom(2)/molecule. Techniques to exploit these monolayers in the surface forces apparatus (SFA) are described. The length of the alkyl chain of the…
The activation energy of electromigration in 'bamboo'-type, passivated Al-1% Si/TiN/Ti lines was determined by means of high resolution resistance measurements at wafer level. Both the very early stages, with a nonlinear behaviour of the resistance, and the subsequent stages, characterized by an approximately constant…
For Pb(ZrxTi1−x)O3 (PZT) thin-film capacitors to be used in ferroelectric nonvolatile memories, they must have low polarization fatigue and low leakage currents. PZT capacitors fabricated in our laboratory with RuO2 electrodes exhibit excellent polarization fatigue characteristics, but they have large and variable lea…
Abstract As a simple method for evaluating the reflection and transmission characteristics of a grating waveguide, an analysis procedure is proposed and formulated that is a combination of the coupled‐mode theory and the finite‐element method. The finite‐element method is used for the determination of the coupling coe…
Abstract A range of polyamides has been modelled using Monte Carlo routines based on carefully determined bond‐rotation potentials, bond length and bond angle. For each polymer type, a large number of chains has been built for different simulated temperatures, and the persistence lengths determined as an average over…
Structural phase transitions between various kinds of superlattice structures formed on a Si(111) surface have been investigated by spot analysis of reflection high-energy electron diffraction (RHEED). Reversible transitions induced by temperature changes and irreversible ones induced by metal depositions were observe…