Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact Angle of Water on Polymer SurfacesT. Yasuda, T. Okuno, and H. YasudaCite this: Langmuir 1994, 10, 7, 2435–2439Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.org/doi/10.1021/la00019a068h…
Many of the properties of orientationally disordered crystals are profoundly affected by the coupling (known as translation-rotation coupling) between translation displacements and molecular orientation. The consequences of translation-rotation coupling depend on molecular and crystal symmetry, and vary throughout the…
Two poly(ethylenepropylene)–poly(ethylethylene) (PEP-PEE) diblock copolymer melts, containing 25% and 83% by volume PEP, were investigated using small-angle neutron scattering (SANS) and rheological measurements. The SANS measurements were performed with the aid of an in situ shearing device operated directly in the n…
Today the determination of successful crystallization conditions for a particular macromolecule remains a highly empirical process. Sparse-matrix and grid-screening procedures are rapid and economical means to determine preliminary crystallization conditions. During optimization the variable set (pH, precipitant type…
The bulk and surface structure of two BaTiO3 powders has been investigated by FT-IR and FT-Raman spectroscopies. A high-area sample (39 m2/g), produced by a hydrothermal method, cubic to XRD, appears to have lower symmetry to Raman spectroscopy, with unit-cell distortions similar to those of tetragonal ferroelectric B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR Study of the Tautomerism of Porphyrin Including the Kinetic HH/HD/DD Isotope Effects in the Liquid and the Solid StateJuergen Braun, Martin Koecher, Martin Schlabach, Bernd Wehrle, Han-Heinrich Limbach, and Emanuel VogelCite this: J. Am. Chem. Soc. 1994, 116, 15, 6593–66…
Superhard materials are needed to replace diamond in applications at high temperatures, where diamond is unstable. Novel carbon‐ and boron‐based materials are described whose discovery or postulation has greatly stimulated research in this area. The use of calculations to predict the properties of new materials is ill…
Neutron-diffraction experiments and polarization analysis techniques reveal that the metal-insulator transition in the orthorhombic perovskites ${\mathrm{PrNiO}}_{3}$ and ${\mathrm{NdNiO}}_{3}$ is accompanied by a sudden three-dimensional magnetic ordering of the Ni sites (${\mathrm{\ensuremath{\mu}}}_{\mathrm{Ni}}$\e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiodegradable Plastic Made from Soybean Products. 1. Effect of Preparation and Processing on Mechanical Properties and Water AbsorptionInke Paetau, Chin-Zue Chen, and Jay-lin JaneCite this: Ind. Eng. Chem. Res. 1994, 33, 7, 1821–1827Publication Date (Print):July 1, 1994Publi…
Tetragonal La-modified lead zirconate titanate (PLZT) ceramics (Zr/Ti=40/60) with La-contents of 8, 12, and 15at.% have been studied using dielectric spectroscopy, X-ray diffraction, and hot-stage transmission electron microscopy (TEM). Increasing La-content drives the lead zirconate titanate from near conventional fe…
Forward biasing of transparent nanocrystalline TiO 2 (anatase) films in lithium ion‐containing organic electrolytes leads to rapid and reversible coloration due to electron accumulation and Li + intercalation in the anatase lattice. Absorption of >90% light throughout the visible and near IR can be switched on and off…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of an Organosilicon Dendrimer Containing 324 Si-H BondsDietmar Seyferth, David Y. Son, Arnold L. Rheingold, and Robert L. OstranderCite this: Organometallics 1994, 13, 7, 2682–2690Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Pu…
Measurements of the complex dielectric permittivity in nominally pure ${\mathrm{SrTiO}}_{3}$ are reported for frequencies ${10}^{\mathrm{\ensuremath{-}}3}$ Hz\ensuremath{\le}\ensuremath{\nu}\ensuremath{\le}${10}^{8}$ Hz and temperatures 0.1 K\ensuremath{\le}T\ensuremath{\le}300 K. The experiments reveal relaxation phe…
In part I, the concept of a temperature dependent domain stability map was developed for tetragonal ferroelectrics grown on cubic substrates. In this paper, a range of experimental data on domain populations in heteroepitaxial ferroelectric films is placed in the context of the stability map. Experimental data shows t…
Each year, many single-crystal structure analyses are reported that show evidence of over- or under-refinement. Often, the refinement strategies have been naive or over-complex and alternative strategies might have been more effective. The many descriptions of crystallographic and numerical techniques suitable for ass…
Abstract We have generated microcellular polymeric foam structures using a pressure induced phase separation in concentrated mixtures of supercritical CO 2 and poly(methyl methacrylate). The process typically generates a microcellular core structure encased by a nonporous skin, the thickness of which decreases with in…
The effect of seeding on microstructure development and mechanical properties of silicon nitride was investigated by the use of morphologically regulated rodlike β‐Si 3 N 4 singlecrystal particles with a diameter of 1 μm and a length of 4 μm as seed crystals. Silicon nitride with a bimodal microstructure was fabricate…
The role of microstructural scale on deformation‐micro fracture damage induced by contact with spheres is investigated in monophase alumina ceramics over a range 3–48 μ in grain size. Measurement of a universal indentation stress–strain curve indicates a critical contact pressure ≅5 GPa, above which irreversible defor…
That dendrimer structures act as fundamental chemical building blocks (see Figure), forming a “nanoscopic chemistry set” analogous to the “picoscopic chemistry set” formed by atoms, is discussed in this review. Following the logic used by 19th century chemists while defining the atomic “chemistry set”, it is shown tha…