Materials Literature
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Densely packed monolayers of spherical polymer particles are expected to show interesting materials properties, e.g. a high permeability. It is demonstrated that relatively close‐packed Langmuir films of monodisperse 0.5 μm particles—with a hydrophilic shell and hydrophobic core—can be formed at the air‐water interfac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLewis Acid-Assisted Anionic Ring-Opening Polymerization of Epoxide by the Aluminum Complexes of Porphyrin, Phthalocyanine, Tetraazaannulene, and Schiff Base as InitiatorsHiroshi Sugimoto, Chikara Kawamura, Masakatsu Kuroki, Takuzo Aida, and Shohei InoueCite this: Macromolecu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnsheathing a Polyoxometalate: Convenient Systematic Introduction of Organoimido Ligands at Terminal Oxo Sites in [Mo6O19]2-Joseph B. Strong, Robert Ostrander, Arnold L. Rheingold, and Eric A. MaattaCite this: J. Am. Chem. Soc. 1994, 116, 8, 3601–3602Publication Date (Print)…
For antitumor agents introduced directly into the intracranial space, the extent of penetration into tissue, and hence the effectiveness of therapy, depends on the rate of drug elimination from the tissue. To test the hypothesis that slowly eliminated agents would penetrate further through tissues, methotrexate (MTX)-…
ABSTRACT: Peroxy radicals, when generated in the presence of hindered-amine light stabilizers (HALS), oxidized HALS to produce nitroxides. This reaction, in addition to the scavenging of alkyl radicals by nitroxides, forms a cycle describing HALS as a class of excellent polymer stabilizers. As model systems for the me…
The lattice constants of diamond crystals consisting of an isotopic mixture of $^{13}\mathrm{C}_{\mathit{x}}^{12}$${\mathrm{C}}_{(1\mathrm{\ensuremath{-}}\mathit{x})}$ were measured as a function of the isotopic composition by single-crystal diffractometry using the synchrotron x-ray radiation. The isotope ratio of th…
Abstract Polyurethane foam formation involves both polymerization and expansion processes. The dynamics of the water and R‐11 blown foams depend on the rates of chemical and physical blowing processes, along with the rate of viscosity increase of the reacting mixture. Experiments were carried out to study the dynamics…
In this paper we report a time-resolved investigation of transients derived from curcumin, which may be intimately involved in the processes leading to its biological activity. Fluorescence and triplet quantum yields are respectively 0.06 and 0.11. The high percentage of internal conversion is proposed to proceed via…
Pressureless sintering of monolithic ceramics results in substantial shrinkage as the void space in the initially porous starting material is eliminated. Introduction of fibers or platelets inhibits sintering. Thus, when ceramic composites are made, processes other than sintering are used to achieve dense structures o…
Abstract Poly(propylene)s with narrow molecular weight distributions were prepared with various methylaluminoxane‐activated metallocene‐based Ziegler‐Natta catalysts to study the influence of randomly incorporated regio‐ and stereoirregularities on the crystallization behavior. As a function of the metallocene type an…
We describe here the experimental conditions under which the photoelectrochemical etching (PEC‐etching) of n‐type silicon in HF induces the formation of porous silicon. Two types of porous silicon are formed underneath an etch crater: a layer of nanoporous material with pores in the nanometer range on top of a macropo…
Pure Ta has been cold rolled and annealed at various temperatures. The crystallographic textures were studied by measuring X-ray pole figures and subsequently calculating the orientation distribution function. The microstructure was investigated via optical microscopy. The rolling textures were explained by dislocatio…
A photopyroelectric technique has been used to simultaneously measure the critical behavior of specific heat, thermal conductivity, and thermal diffusivity of ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ at the antiferromagnetic-paramagnetic phase transition. An Ising-like behavior has been found for \ensuremath{\Vert}${\mat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtomic layer epitaxy growth of titanium dioxide thin films from titanium ethoxideMikko Ritala, Markku Leskela, and Eero RauhalaCite this: Chem. Mater. 1994, 6, 4, 556–561Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 A…
At the wall in a hybrid cell with strong anchoring, the nematic director is parallel to one wall and perpendicular to the other. Usually, the free energy is minimized by a configuration where the director orientation changes continuously with position across the cell. The boundary conditions can also be satisfied, how…
The kinetics of monoatomic steps in diffusion-controlled crystal growth and evaporation processes are investigated analytically using a Green's function approach. Integro-differential equations of motion for the steps are derived; a systematic linear stability analysis is carried out treating simultaneously perturbati…
Dielectric properties of lead magnesium niobate (PMN) and Ta-bearing strontium barium niobate (SBNT) were measured as a function of temperature, and the crystal structure of PMN was refined by the Rietveld analysis method. The results of structure refinement indicate that the volume of polar microregions (PMR) increas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of .epsilon.-Caprolactone by Divalent Samarium ComplexesWilliam J. Evans and Hideo KatsumataCite this: Macromolecules 1994, 27, 8, 2330–2332Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 April 1994https:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Modeling of Polycarbonate. 1. Force Field, Static Structure, and Mechanical PropertiesCun Feng Fan, Tahir Cagin, Zhuo Min Chen, and Kennith A. SmithCite this: Macromolecules 1994, 27, 9, 2383–2391Publication Date (Print):April 1, 1994Publication History Published o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmorphous, biomimetic granules of polyhydroxybutyrate: preparation, characterization, and biological implicationsDaniel M. Horowitz and Jeremy K. M. SandersCite this: J. Am. Chem. Soc. 1994, 116, 7, 2695–2702Publication Date (Print):April 1, 1994Publication History Published…