Materials Literature
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Metallic zinc nanowires are synthesized by evaporating ZnO powder mixed with graphite in an NH3 flowing carrying gas environment. The majority of the as-synthesized zinc nanowires are single crystalline and free from structural defects, whereas a small portion of the nanowires consists of single-crystalline Zn nanorod…
Neutron reflectivity was used to characterize the structure of end-grafted deuterated poly(dimethylsiloxane) ( d- PDMS) brushes on SiO x wafers exposed to liquid and supercritical carbon dioxide (CO 2 ). The solvent quality was tuned continuously over a large range from ideal gas conditions to a near-ϑ solvent by vary…
Unexpectedly high-longitudinal piezoelectric coefficients have recently been reported in c-axis oriented Pb(Zr,Ti)O3 thin films with morphotropic phase boundary composition [Fu et al., Appl. Phys. Lett. 80, 3572 (2002)]. Our analysis and experimental results show that, in comparison with other methods commonly used to…
From the water - methanol solution of Cu(II) - LN - [Ni(CN)4]2- (1:2:1) (LN = N, N-dimethylethylenediamine (dmen); N,N'-dimethylethylenediamine (bmen); N,N,N',N'-tetramethylethylenediamine (tmen) ) were isolated three new compounds: Cu(dmen)2Ni(CN)4 (CDNC), Cu(bmen)2Ni(CN)4 (CBNC) and Cu(tmen)Ni(CN)4 (CTNC). The resul…
Eight poly(aryl) ether dendritic wedges attached to the periphery of a phthalocyanine significantly decreases self-association of these chromophores in solution and the condensed state.
Intercalation of methylene blue into K 4 Nb 6 O 17 single crystals was investigated for the construction of hybrid materials with three-dimensional anisotropy. By the reaction of K 4 Nb 6 O 17 with a methylene blue aqueous solution in the presence of propylamine, methylene blue/K 4 Nb 6 O 17 intercalation compounds we…
Abstract We highlight the self‐similar features of the frequency‐dependent (absolute) reflection coefficient of a dielectric Cantor prefractal obtained by applying the well‐known Cantor‐set construction to the optical (rather than physical) layer lengths. The referred properties are first obtained using an exact chara…
Pretilt angle measurable by using the conventional crystal rotation method is limited to about 0°–20° and 70°–90°. We propose a method by which we can measure the pretilt angle by using the crystal rotation method even if the pretilt angle is between 20° and 70°. In this method, the determination of a pretilt angle is…
We numerically study a nondisordered lattice spin system with a first order liquid–crystal transition, as a model for supercooled liquids and glasses. Below the melting temperature the system can be kept in the metastable liquid phase, and it displays a dynamic phenomenology analogous to fragile supercooled liquids, w…
The electronic structures and interface properties of the TiO2/Cu2S interface have been in situ studied after each growth step by x-ray and ultraviolet photoelectron spectroscopy. The p-doped Cu2S films (BEVBM=0.1 eV) were grown on the highly n-doped chemical vapor deposition prepared TiO2 (BEVBM=3.4 eV) films by ther…
We show that the near surface structure of lamellar ABC triblock copolymer mesostructures can deviate considerably from the “ideal” surface anticipated from the bulk structure of the material. Varying the molecular architecture and the surface energy difference between the respective blocks, we show that such surface…
Abstract The influence of the electron beam modification of a dual‐phase filler on the dynamic mechanical properties of styrene‐butadiene rubber (SBR) is investigated in the presence and absence of trimethylol propane triacrylate or triethoxysilylpropyltetrasulfide. Electron beam modification of the filler results in…
The hexagonally perforated layer (HPL) phase in a polystyrene- b -poly(ethylene oxide) (PS- b -PEO) diblock copolymer was systematically studied by small-angle X-ray scattering (SAXS) in reciprocal space and transmission electron microscopy (TEM) in real space. Detailed crystallographic analyses revealed that the shea…
Negative index of refraction materials have been postulated for many years but have only recently been realized in practice. In the microwave region these materials are constructed of rings and wires deposited on a dielectric substrate to form a unit cell. We have constructed, experimentally characterized, and simulat…
Ferromagnetic behavior of GaN doped with Mn (Ga1−zMnzN) grown by the ammonothermal and chemical transport methods is discussed in terms of a second phase (ferromagnetic one) produced during the growth process. The reference manganese nitride samples grown by the same method as (Ga,Mn)N reveal room-temperature ferromag…
The electronic structure and structural stability of the technologically interesting material NaAlH4 are studied using an ab initio projected augmented plane-wave method for different possible structure modifications. We predict that α-NaAlH4 converts to β-NaAlH4 at 6.43 GPa with a 4 % volume contraction. Both modific…
First-principles electronic structure methods have been used to calculate the ground state, transition temperature, and thermodynamic properties of magnetic excitations in spinel ${\mathrm{MnO}}_{2}.$ The magnetic interactions are mapped onto a Heisenberg model whose exchange interactions are fitted to results of firs…
The temperature dependence of the overall rate constant for the C 3 H 7 O 2 + NO reaction and the rate constant for the minor branching channel resulting in the production of i -C 3 H 7 ONO 2 have been measured using the turbulent flow technique with high-pressure chemical ionization mass spectrometry for the detectio…
We apply first-principles calculations to study the electronic structure of boron nitride nanocones with disclinations of different angles θ=nπ/3. Nanocones with odd values of n present antiphase boundaries that cause a reduction of the work function of the nanocones, relative to the bulk BN value, by as much as 2 eV.…
We present a dynamic Monte-Carlo model involving lateral interactions and different adsorption sites (top, fcc and hcp). Using this model in combination with kinetic parameters from UHV experiments and lateral interactions derived from DFT calculations we have reproduced the ordering behavior of NO on Rh(111) during a…