Materials Literature
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Single crystals of PMN have been studied between 10 and 300 K by means of dielectric, polarization and poling/depoling current measurements, associated with optical domain observations under bias field. Evidence for a first order electric field-induced phase transition, from the mean cubic phase to a macroscopically p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and crystal structures of M(DO3A) (M = iron, gadolinium) and Na[M(DOTA)] (M = Fe, yttrium, Gd)C. Allen Chang, Lynn C. Francesconi, Mary F. Malley, Krishan Kumar, Jack Z. Gougoutas, Michael F. Tweedle, Daniel W. Lee, and Lon J. WilsonCite this: In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-bonded liquid crystals. Novel mesogens incorporating nonmesogenic bipyridyl compounds through complexation between hydrogen-bond donor and acceptor moietiesTakashi Kato, Jean M. J. Frechet, Paul G. Wilson, Takeshi Saito, Toshiyuki Uryu, Akira Fujishima, Chihiro Jin,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTitanium isopropoxide as a precursor in atomic layer epitaxy of titanium dioxide thin filmsMikko Ritala, Markku Leskela, Lauri Niinisto, and Pekka HaussaloCite this: Chem. Mater. 1993, 5, 8, 1174–1181Publication Date (Print):August 1, 1993Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-layered silicate nanocomposites: in situ intercalative polymerization of .epsilon.-caprolactone in layered silicatesPhillip B. Messersmith and Emmanuel P. GiannelisCite this: Chem. Mater. 1993, 5, 8, 1064–1066Publication Date (Print):August 1, 1993Publication History…
In powder diffraction measurements, the errors in integrated intensities caused by preferred orientation can be corrected by using some suitable analytical model as the representation of the orientation distribution of the crystallites. In this paper, a model based on symmetrized harmonics expansion is described in de…
The surface roughness and nanometer scale structure of Ag films used for surface-enhanced Raman scattering (SERS) are characterized using atomic force microscopy (AFM). Two important types of thin film based SERS-active surface have been examined in this study: (1) Ag island films (AgIF’s) on smooth, insulating substr…
Catalytic combustion, as an alternative to conventional thermal combustion, has received considerable attention during the past decade. Research efforts have been promoted by the need to meet governmental demands concerning pollution and the wish to use energy sources more efficiently. The two main advantages offered…
The cooling of a crystal in combination with the use of a protecting oil facilitates the handling and transfer to a diffractometer of even very sensitive material. The method is explained and the required device is described in this work. Basic advantages of the technique are simplicity and freedom of access to the sa…
PSK (Krestin), a protein-bound polysaccharide extracted from Coriolus versicolor, stimulated the production of interleukin-1 (IL-1) by human peripheral blood mononuclear cells more efficiently than the production of tumor necrosis factor (TNF). More IL-1 alpha was accumulated in the cells than in the medium fraction,…
Pb(Zr1−xTix)O3 thin films covering the whole compositional range x=0 to x=1 have been grown for the first time on the sapphire (11̄02) plane using the metalorganic chemical vapor deposition technique. The films are three-dimensionally epitaxial and exhibit single crystal properties. The structural transitions, examine…
We report for the first time on room temperature electroluminescence in the region 1.3–1.7 μm from a strain-adjusted Si6Ge4 superlattice. These results, together with photoluminescence, short-circuit photocurrent spectroscopy, and voltage-intensity and current-intensity measurements indicate that the observed electrol…
Photochemical regulation of in-plane alignment of a nematic liquid crystal is presented. A quartz plate surface was modified with 4-hexyl-4′-hexyloxyazobenzene substituted with triethoxysilyl group through a spacer at the 2′ position to introduce the side-on type azobenzene unit of the surface. A liquid crystal hybrid…
In this paper, it is reported that the electroluminescence (EL) of porous silicon shows a reversible spectral shift as large as 270 nm for an external bias variation of 0.6 V. This electroluminescence is obtained upon cathodic polarization of lightly doped n-type porous silicon in contact with aqueous persulphate solu…
It is found that the thermally activated behavior of nonlinear conduction below the threshold field in thin samples of orthorhombic ${\mathrm{TaS}}_{3}$ vanishes at temperatures below 10 K. Current noise appearing in the low-temperature region indicates that the electric current is transferred by portions of charge wh…
We report the first experimental observation of the commensurate state of the recently discovered helical smectic-C phase. The projection of the reciprocal lattice on the plane perpendicular to the pitch axis consists of a ring of equispaced Bragg spots, as predicted by Renn and Lubensky for the ``twist grain boundary…
We study the selection of the shape and growth velocity of three-dimensional dendritic crystals in cubically anisotropic materials. In the framework of asymptotics beyond all orders we derive the inner boundary-layer equation for the nonaxisymmetric shape correction to the Ivantsov paraboloid shape. The solvability co…
Single quasicrystals of ${\mathrm{Al}}_{70}$${\mathrm{Pd}}_{21}$${\mathrm{Mn}}_{9}$ were plastically deformed by 25% under compression at 750 C. Both these samples as well as control samples of as-grown and heat-treated material were investigated by transmission electron microscopy. It was found that upon deformation…
A stable, non-peptide inhibitor of the protease from type 1 human immunodeficiency virus has been developed, and the stereochemistry of binding defined through crystallographic three-dimensional structure determination. The initial compound, haloperidol, was discovered through computational screening of the Cambridge…
A compound has been synthesized with the formula (rad)(2)Mn(2)[Cu(opba)](3)(DMSO)(2).2H(2)O, where rad(+) is 2-(4-N-methylpyridinium)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, opba is orthophenylenebis(oxamato), and DMSO is dimethyl sulfoxide. It consists of two nearly perpendicular graphite-like networks with ed…