Materials Literature
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A 4.5-inch fully sealed carbon-nanotube field-emission display with a 200-µm narrow gap was fabricated on glass using paste squeezing and surface rubbing techniques. The fabricated displays were fully scalable at low temperatures below 415°C and showed very high luminance of 1800 cd/m 2 at 4 V/µm. The degradation of e…
The synthesis and mesomorphic properties of several achiral compounds composed of banana-shaped molecules are described. These compounds belong to three different homologous series. They have been examined by polarized light microscopy, differential scanning calorimetry, x-ray diffraction studies and electro-optic inv…
New series of macrocyclic Schiff-base lanthanide(III), yttrium(III), and cadmium(II) complexes, [M(1)]Xn (X = NO, M = Y, Ln = La–Yb except Pm and Dy; X = ClO, M = Cd, La, Ce, Pr, Sm, Gd, or Er) and [M(3)]Xn (X = NO, M = Dy; X = ClO, M = Er and Cd), have been prepared by cyclocondensation of O1,O7-bis(2-formylphenyl)-1…
The magnetization through an electric-field-driven transition from a charge ordered state to a conducting one in polycrystalline ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3},$ with $x=1/3$ and $0.4,$ have been measured, simultaneously with current-voltage characteristics. These measurements hav…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSonochemical Preparation of a Nanostructured Bifunctional CatalystGennady Dantsin and Kenneth S. SuslickView Author Information School of Chemical Sciences University of Illinois at Urbana-Champaign 600 S. Mathews Avenue, Urbana, Illinois 61801 Cite this: J. Am. Chem.…
With the use of information entropy theory, the orientational distribution function of cylindrically symmetric probe molecules in uniaxial systems is reconsidered from the second-rank and fourth-rank Legendre polynomials (< P 2n (cos θ)>) order parameter values. Emphasis is put on the domain of negative values (…
Abstract A pyrazine bridged dimer of triruthenium clusters [{RuIII2RuII(μ3-O)(μ-CH3CO2)6(CO)(abco)}2(μ-pz)] (abco =1-azabicyclo[2,2,2]octane, pz = pyrazine) gives an inter-cluster mixed valence state upon one electron reduction. The splitting of the reduction waves in cyclic voltammetry, ΔE, was 470 mV. This correspon…
Spin, charge, and orbital structures in models for doped manganites are studied by a combination of analytic mean-field and numerical relaxation techniques. At realistic values for the electron-phonon and antiferromagnetic ${t}_{2\mathrm{g}}$ spin couplings, a competition between a ferromagnetic (FM) phase and a charg…
A new achiral five-ring banana-shaped mesogen is presented which has a cyano substituent in the 4-position of the central core. Microscopical, X-ray, dielectric and electro-optical investigations give evidence for the unusual phase sequence B2, SmC, SmA. The B2 phase shows an antiferroelectric switching behaviour; the…
The equilibrium geometries of the molybdenum oxo/peroxo compounds MoOn(O2)3-n and the related complexes [MoOn(O2)3-n(OPH3)] and [MoOn(O2)3-n(OPH3)(H2O)] (n = 0-3) have been calculated using gradient-corrected density-functional theory at the B3LYP level. The structures of the peroxo complexes with ethylene ligands [Mo…
We generalize the Landau-Zener theory of coherent tunneling transitions by taking thermal relaxation into account. The evaluation of a generalized master equation containing a dynamic tunneling rate that includes the interaction between the relevant system and its environment leads to an incoherent Zener transition pr…
We present neutron powder diffraction results which give unambiguous evidence for the formation of the recently identified new crystalline ice phase [[2]], labeled ice XII, in completely different conditions. Ice XII is produced here by compressing hexagonal ice ${\mathrm{I}}_{h}$ at $T\phantom{\rule{0ex}{0ex}}=\phant…
Abstract We employ rheological measurements of polyethylene blends in the melt and solid state, together with thermal analysis, to infer phase behavior. Partial‐miscibility in the melt is characterized by use of the double‐reptation model to define the complex modulus of the continuous phase for input into the emulsio…
We report on the preparation and field emission properties of quasi-aligned silicon carbon nitride (SiCN) nanorods. The SiCN nanorods are formed by using a two-stage growth method wherein the first stage involves formation of a buffer layer containing high density of nanocrystals by electron cyclotron resonance plasma…
We present an experimental study of the domain and twin structure in the martensitic phase of the ferromagnetic shape memory alloy Ni2MnGa using magnetic force microscopy. After cooling through the austenite–martensite transformation under no field, a rectangular specimen with {100} faces consistently adopted a struct…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHyperbranched Polyesters as Nanoporosity Templating Agents for OrganosilicatesC. Nguyen, C. J. Hawker, R. D. Miller, E. Huang, J. L. Hedrick, R. Gauderon, and J. G. HilbornView Author Information IBM Almaden Research Center, 650 Harry Rd, San Jose, California 95120-6099 Departm…
The influence of the polarization interactions on the state and phase transitions in magnetic-ordered and dielectric crystals with two interacting order parameters has been investigated. Consideration is given to the case when the interaction in one of the subsystems is considerably weaker than that in the other subsy…
The interplay between material microstructure and magnetic hysteresis is studied in rapidly quenched Si–Fe alloys. Two ribbons of different average grain dimension 〈s〉 (35 and 160 μm) were prepared by annealing at different temperatures and studied through two independent approaches: Barkhausen noise measurements, and…
The effect of the periodic boundary condition (PBC) on the structure and energetics of nanotubes has been investigated by performing molecular-dynamics computer simulation. Calculations have been realized by using an empirical many-body potential energy function for carbon. A single-wall carbon nanotube has been consi…
Article Rheological and Calorimetric Characterization of an Epoxy System Cured in Presence of a Reactive Polyethersulphone was published on May 1, 2000 in the journal Journal of Polymer Engineering (volume 20, issue 3).