Materials Literature
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Abstract Compatibilization of blends of linear low‐density polyethylene (LLDPE) and polystyrene (PS) with block copolymers of styrene (S) and butadiene (B) or hydrogenated butadiene (EB) has been studied. The morphology of the LLDPE/PS (50/50) composition typically with 5% copolymer was characterized primarily by scan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn Situ EXAFS Study of the Photocatalytic Reduction and Deposition of Gold on Colloidal TitaniaA. Fernandez, A. Caballero, A. R. Gonzalez-Elipe, J.-M. Herrmann, H. Dexpert, and F. VillainCite this: J. Phys. Chem. 1995, 99, 10, 3303–3309Publication Date (Print):March 1, 1995P…
Cyclic fatigue growth rates in R‐curve ceramics have been observed to depend very strongly on the maximum applied stress intensity, K max , and only weakly on the stress intensity range, Δ This behavior is rationalized through measurement of crack wake shielding characteristics as a function of these fatigue parameter…
The effective sintering rates and viscosities of three‐dimensional composite packings have been studied using a discrete numerical model. The packings consist of random mixtures of hard and soft spheres of the same size. With increasing substitution of hard particles for soft particles in the packing, the viscosity in…
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…