Materials Literature
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We numerically investigate the influence of a homogeneous shear flow on the spinodal decomposition of a binary mixture by solving the Cahn-Hilliard equation in a two-dimensional geometry. Several aspects of this much studied problem are clarified. Our numerical data show unambiguously that, in the shear flow, the doma…
We present a density functional theory for a model colloidal mixture of hard spheres and infinitely thin hard rods. For these freely rotating particles, we use a fundamental measures approach to obtain a functional that features the correct dimensional crossover and the exact low density limit. For isotropic bulk flui…
Wetting or dewetting on soft elastomeric surfaces is largely controlled by the dissipative properties (viscoelasticity) of the substrate. The component of liquid surface tension acting perpendicularly to the solid causes a deformation, or “wetting ridge”, which must be displaced with the triple line. Previously, tripl…
We have employed molecular beam techniques combined with in situ IR reflection absorption spectroscopy to study the CO oxidation kinetics on oxide-supported model catalysts. As model systems we utilize Pd particles of different size and morphology grown under ultrahigh vacuum conditions on a well-ordered alumina film…
Porphyrins with fused aromatic rings are under detailed investigation due to their unique spectroscopic properties. To gain more insights into the effects due to ring annealation on the porphyrin chromophore, a series of fluoranthoporphyrins have been synthesized. Reaction of 3-nitrofluoranthene with isocyanoacetate e…
Silver films were deposited at room temperature onto H-passivated Si(111) surfaces. Their electronic properties have been analyzed by angle-resolved photoelectron spectroscopy. Submonolayer films were semiconducting and the onset of metallization was found at a Ag coverage of $\sim$0.6 monolayers. Two surface states w…
Thick metallic silver films have been deposited onto Si(111)-(7x7) substrates at room temperature. Their electronic properties have been studied by using angle resolved photoelectron spectroscopy (ARPES). In addition to the electronic band dispersion along the high-symmetry directions, the Fermi surface topology of th…
Photodetachment microscopy of the negative ions Si - and F - has made it possible to measure the electron affinities of silicon and fluorine with improved accuracy. The new recommended electron affinities of 28 Si and 19 F are 11 207.252(18) and 27 432.446(19) cm -1 , i.e. 1.389 5220(24) and 3.401 1895(25) eV, respect…
The observed temperature dependence of electrical conduction in polymer electrolytes is usually fitted with two separated equations: an Arrhenius equation at low temperatures and Vogel-Tamman-Fulcher (VTF) at high temperatures. We report here a derivation of a single equation to explain the variation of electrical con…
We report the magnetic susceptibility, specific heat and dielectric constant on high purity polycrystalline samples of three hexagonal manganites: YMnO_3, LuMnO_3 and ScMnO_3. These materials can exhibit a ferroelectric transition at very high temperatures (T_{FE} > 700K). At lower temperatures there is magnetic order…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLangmuir−Blodgett Nanorod AssemblyFranklin Kim, Serena Kwan, Jennifer Akana, and Peidong YangView Author Information Department of Chemistry, University of California Berkeley, California 94720 Cite this: J. Am. Chem. Soc. 2001, 123, 18, 4360–4361Publication Date (Web)…
We present the results of soft x-ray emission measurements for undoped and protonated polyemeraldine. We show that the polaron-lattice band structure fully accounts for the observed x-ray transitions. A finite spectral intensity of C Kα and N Kα XES is observed at the Fermi level for protonated polyemeraldine, support…
Holographic studies in azobenzene side-chain polymers reveal light-induced periodic surface reliefs at temperatures far below the glass transition temperature. We performed experiments with two-color holography on an azobenzene polymer. An intensive and linear polarized homogeneous blue pump beam illuminated the sampl…
We present details of an experimental study of crystallization adjacent to a cooled boundary from an aqueous solution of potassium nitrate and sodium nitrate. This transparent system is typical of many ternary melts that do not form solid solutions, including examples in igneous petrology and metallurgy. We have measu…
We reexamine the double exchange (DE) theory of the canted spin arrangement in three-dimensional perovskite manganites ${R}_{1\ensuremath{-}x}{D}_{x}{\mathrm{MnO}}_{3}$ (R=trivalent rare-earth ion, D=divalent ion). Our approach is based on the multiple-scattering theory, takes into account the twofold degeneracy of th…
A simple model is proposed to calculate the resistivity, magnetoresistance, and noise spectrum in nonmetallic phase-separated manganites containing small metallic droplets (magnetic polarons). The system is taken to be far from the percolation transition into a metallic state. It is assumed that the charge transfer oc…
Six molecular complexes formed between 4-hydroxy-4‘-nitrobiphenyl/stilbene and a 4-substituted pyridine-1-oxide [methyl ( 1, 2 ), cyano ( 3, 4 ), and nitro ( 5, 6 )] have been studied with the specific aim of assessing a new design strategy for the molecular complexation of new materials that show quadratic nonlinear…
In this study, axisymmetric drop shape analysis-profile (ADSA-P) and atomic force microscopy (AFM) were employed to study the surface features of polypropylene (PP) and hydrosilylated polypropylene (SPP). Static and dynamic contact angles were measured using ADSA-P. Water permeability was calculated from the results o…
We investigate aggregation properties of a liquid crystalline colloid formed by dispersing small PMMA particles in thermotropic nematic liquid crystal 5CB. Upon cooling a low-concentration homogeneous mixture below the clearing point of the nematic phase, polymeric particles aggregate into cellular structures, causing…
The dissolution kinetics of β-tricalcium phosphate (β-TCP) was investigated at 37 °C using the constant composition (CC) method over a range of undersaturation. The rates decreased markedly with time despite the sustained driving force and eventually approached zero, indicating a critical condition in the dissolution…