Materials Literature
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SUMMARY We show that the number of atoms in a small supported catalyst cluster can be estimated from the strength of electron scattering into a high angle annular detector in the STEM. The technique is related to the Z contrast methods developed by Crewe, Wall, Langmore and Isaacson. It works best for high atomic numb…
Dilute suspensions of micron diameter dielectric spheres confined to two dimensions are induced to aggregate linearly by application of an electric field. The growth of the average cluster size agrees well with the Smoluchowski equation, but the evolution of the measured cluster size distribution exhibits significant…
Two tricritical points, where a phase transition changes from first to second order, were found to occur in the lead zirconate-titanate (PZT) solid solution system. High-temperature x-ray diffraction data on sol-gel derived PZT powders were used to calculate the cell parameters and spontaneous strain in the ferroelect…
Magnetization measurements are reported for ${\mathrm{Fe}}_{3(1\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}})}$${\mathrm{O}}_{4}$ in the range 0\ensuremath{\le}\ensuremath{\delta}<0.010. Anisotropy parameters consistent with these measurements were determined as a function of \ensuremath{\delta} and of temper…
It has been widely observed in ionic donor-acceptor charge-transfer (CT) compounds that kink-type domain walls between one-dimensional ferroelectric molecular domains show strong dielectric response with a thermally activated relaxation frequency over a wide temperature range. The domain walls can carry spin and elect…
ABSTRACT Various formulations and methods of fabricating a film consisting of edible hydrocolloids and lipids were investigated. Two formulations consisting of a methylcellulose base layer and a beeswax layer, deposited either from a molten state (Wax‐M film) or from an ethanolic solution (Wax‐S film), were examined f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAryl-bridged polysilsesquioxanes--new microporous materialsKenneth J. Shea, Douglas A. Loy, and Owen W. WebsterCite this: Chem. Mater. 1989, 1, 6, 572–574Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989h…
The qualitative predictions of the mode–mode-coupling (MMC) theory developed in the preceding paper are determined for various transport properties and time correlation functions. The degree of polymerization N dependence of the self-diffusion constant D of long flexible chain and rigid rod melts are found to be in ag…
Inelastic-neutron-scattering studies of glassy, liquid, and polycrystalline selenium have been performed at temperatures between 100 and 600 K. A self-consistent data evaluation, taking careful account of multiple and multiphonon scattering, shows that a complete interpretation is possible in terms of a temperature-de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical and magnetic properties of liquid crystalline molecular materials: lithium and lutetium phthalocyanine derivativesZ. Belarbi, C. Sirlin, J. Simon, and Jean Jacques AndreCite this: J. Phys. Chem. 1989, 93, 24, 8105–8110Publication Date (Print):November 1, 1989Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlock copolymer self-assembly in selective solvents: theory of solubilization in spherical micellesR. Nagarajan and K. GaneshCite this: Macromolecules 1989, 22, 11, 4312–4325Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inis…
A new direct imaging photoelectron microscope has been demonstrated at the Stanford Synchrotron Radiation Laboratory. Data are obtained in the form of spectrally resolved images with a lateral resolution of &lt;5 μ. The microscope produces a series of projected images with 64×64 picture elements. These images are…
This paper describes the use of electrically conducting polyanilines as discharge layers for electron-beam (e-beam) lithography. The emeraldine oxidation state polyaniline is a soluble material which can be doped by various cationic reagents, most commonly protonic acids, to afford conductivity on the order of 10° Ω−1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFTIR studies of polyimides: thermal curingR. W. Snyder, B. Thomson, B. Bartges, D. Czerniawski, and P. C. PainterCite this: Macromolecules 1989, 22, 11, 4166–4172Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 Novemb…
Focusing on all aspects of composites, this book covers the composition, structure, and physical properties of composites. You'll study the manufacturing methods of fiber reinforced plastics and post fabrication techniques, as well as the latest composites applications. Topics include: thermosets, thermoplastics, non-…
In this final paper of a sequence of five papers presenting details of a thermodynamic phenomenology for the whole PbZrO3 : PbTiO3 solid solution family, the constants derived in the earlier papers are used to calculate the temperature and composition dependence of the Elastic Gibbs Free Energy ΔG 1 at zero stress, th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdvanced oxidation processes. Description of a kinetic model for the oxidation of hazardous materials in aqueous media with ozone and hydrogen peroxide in a semibatch reactorWilliam H. Glaze and Joon Wun KangCite this: Ind. Eng. Chem. Res. 1989, 28, 11, 1573–1580Publication…
Vaiues of the Curie constant (C) and sixth-order polarization interaction dielectric stiffness coefficients (α112 and α123) are needed for the development of a thermodynamic theory for the entire lead zirconate-titanate (PZT) solid solution system. Low-temperature dielectric data measured on pure homogeneous polycryst…
A formally exact, nonlinear generalized Langevin equation (GLE) for a flexible probe polymer in a dense melt has been derived using molecular phase space kinetic theory and Mori–Zwanzig projection operator techniques. An approximate, linearized dynamic memory function is developed, and the resulting GLE is specialized…
The effects of vesicle size, lipid composition, and drug-to-lipid ratio on the biological activity of liposomal doxorubicin in mice have been investigated using a versatile procedure for encapsulating doxorubicin inside liposomes. In this procedure, vesicles exhibiting transmembrane pH gradients (acidic inside) were e…