Materials Literature
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A phenomenological model is proposed for the description of the sequences of ferroelectric, antiferroelectric, and ferrielectric smectic phases reported in liquid crystals of the MHPOBC [4-(1-methylheptyloxycarbonyl)phenyl-4'-octyloxybiphenyl-4-carboxylate] type. The model assumes a bilayer smectic ordering and a mech…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Structure of Dialuminiohexaeuropiopentakis(hexaniobate): a High-Nuclearity Oxoniobate ComplexTomoji Ozeki, Toshihiro Yamase, Haruo Naruke, and Yoshinori SasakiCite this: Inorg. Chem. 1994, 33, 3, 409–410Publication Date (Print):February 1, 1994Publication Histo…
We study the quasistatic behavior of the lamellar phase of diblock copolymers under uniaxial compression and tension along the normal direction of the layers, in both the weak segregation limit (WSL) and the strong segregation limit (SSL). In the SSL, we derive a (nonlinear) continuum free energy description of the sy…
The adsorption and desorption of hydrogen from diamond films were studied in ultrahigh vacuum using high resolution electron energy loss spectroscopy as a probe of surface vibrations. Auger electron and energy loss spectroscopies were also used to characterize the diamond surface. The samples studied were boron-doped…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-Saturated Mesoporous MCM-41 Systems Characterized by 1H NMRDuncan Akporiaye, Eddy Walther Hansen, Ralf Schmidt, and Michael StockerCite this: J. Phys. Chem. 1994, 98, 7, 1926–1928Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Pub…
A color change from yellow to red is observed on heating the bipyridinium salt of squaric acid (1). This reversible process is based on a proton transfer during the phase change. According to the Bürgi–Dunitz structure-correlation principle, the structure of the anion in solid 1 represents a point on the reaction coor…
The synthetic compound 4',7-dihydroxyflavylium chloride shows an interesting photochronic effect at moderately acidic pHvalues. Pale yellow solutions of this compound, equilibrated in the dark atpH3.4, become bright yellow upon irradiation with 313-nm light. Switching off the light, gives back the initial pale yellow…
A temperature-driven anchoring transition strongly influenced by ionic impurities appears in a nematic liquid crystal composed of centrosymmetric molecules. Two anchoring parameters, the tilt angle and the anchoring strength, were measured. The observed phenomena are explained as a result of a balance between the orie…
We describe an in vitro test of the hypothesis that viscoelastic properties of the collagen fiber network of skin are influenced by interactions between the macromolecular components in the extracellular matrix. Native type I collagen gels were investigated as a mechanical analog for connective tissue. A series of gel…
A model of ferroelectric switching in thin films which also exhibit semiconducting properties is presented. The two principle assumptions upon which the model is based are (1) that the threshold field for reverse domain nucleation, E cm, is much greater than the field required for domain wall motion, E cm, and (2) tha…
Measurements are presented of the long-time self-diffusion coefficient and of the low shear limiting viscosity of dispersions of charge stabilized colloidal silica spheres. Long-time self-diffusion coefficients were measured using fluorescence recovery after photobleaching (FRAP), the theory of which is presented and…
Abstract 3,3‐Bis[4‐(4‐aminophenoxy)phenyl]phthalide ( II ) was used as a monomer with various aromatic dicarboxylic acids and dianhydrides to synthesize polyamides and polyimides, respectively. The diamine II was derived by a nucleophilic substitution of phenolphthalein with p ‐chloronitrobenzene in the presence of K…
Bacterial periplasmic binding proteins are initial receptors in the process of active transport across cell membranes and/or chemotaxis. Among them, the histidine-binding protein (HisJ) has been extensively studied from the biochemical, physiological, and genetic points of view. The three-dimensional crystal structure…
Cross-linking of collagen-based biomaterials increases their strength and persistence in vivo. Recently, we described an efficient cross-linking process via the formation of acyl azide groups on methylated carboxyl groups of collagen using hydrazine and nitrous acid (referred to here as the hydrazine method). In this…
A theoretical model is proposed to describe the quasi-one-dimensional organic ferromagnet polyBIPO. Different from Ovchinnikov's model, we consider the itineracy of \ensuremath{\pi} electrons, the strong electron-phonon interaction, and electron-electron correlation in a one-dimensional system. Within the mean-field t…
Two methods for the determination of scattering length density profiles from specular reflectivity data are described. Both kinematical and dynamical theory can be used for calculating the reflectivity. In the first method, the scattering density is parameterized using cubic splines. The coefficients in the series are…
Alternating layers of radicals of the π-electron donor 1 and of polyoxonions [CoW12O40]6− (2, polyhedral representation) are contained in the title compound. Thus, organic charge carriers and inorganic electron-acceptor components lie next to each other. Since the polyoxometalates can accommodate different metal ions…
New concepts for a high performance catalyzed‐reaction layer for medium temperature operating solid oxide fuel cells were proposed. Mixed conducting oxide particles, samaria‐doped ceria (SDC), were employed as the anode material utilizing highly dispersed noble metal catalysts on their surface. As the cathode material…
The magnetic and structural properties of pulsed laser deposited MnZn–ferrite films have been examined. The results show that the uniaxial anisotropy, ferromagnetic resonance linewidth and coercive force are strongly influenced by the microstructure of the films, and the saturation magnetization and first-order magnet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservations of Latex Particle Two-Dimensional-Crystal Nucleation in Wetting Films on Mercury, Glass, and MicaAntony S. Dimitrov, Ceco D. Dushkin, Hideyuki Yoshimura, and Kuniaki NagayamaCite this: Langmuir 1994, 10, 2, 432–440Publication Date (Print):February 1, 1994Publica…