Materials Literature
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The ability to control the structure of monolayers on radial and faceted surfaces is an important goal for the successful application of nanoparticles in devices and materials. To investigate the effect of steric bulk in the monolayer periphery on monolayer protected gold cluster (MPC) properties, we have synthesized…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTOptical Properties of Small Clusters of Silver and Gold AtomsRobert H. DoremusView Author Information Materials Science and Engineering Department, Rensselaer Polytechnic Institute, Troy, New York 12180 Cite this: Langmuir 2002, 18, 6, 2436–2437Publication Date (Web):February 8…
Electrostatically self-assembled (ESA) polyelectrolyte films show in general no internal structure. The use of special polycations, however, namely of lyotropic ionenes, may give rise to highly ordered coatings. In this article, the influence of the charge density of the polyanion, as well as the distribution of the c…
Abstract: A new occurrence of natrite,g-Na 2 (CO 3 ), was discovered as monominerallenses (more than 20cm in size) in pegmatites of Mt. Koashva, Khibiny alkalinemassif, Kola peninsula, Russia. Electron microprobe, XRD, IR and optical data fornatrite of this new occurrence are given. A single-crystal fragment isolated…
The enthalpy of oxidation/reduction of the grossly non-stoichiometric high-temperature phase SrFeO3−δ, i.e. the enthalpy ofSrFeO2.50 (perovskite) + ⅙O2(g) ⇌ SrFeO2.8333 (perovskite)has been deduced from calorimetric data. The enthalpy of oxidation of vacancy ordered brownmillerite-type SrFeO2.50 obtained by direct rea…
The collapse of Lennard-Jones homopolymers is investigated by means of Monte Carlo simulations and the inherent structure/superposition approach, with special emphasis on finite size effects. At thermal equilibrium, the polymers undergo a series of phase changes from the zero temperature folded state to a coexistence…
The hydrolytic behavior of monolayers of biodegradable [poly( l -lactide)/poly(ε-caprolactone)] ( l -PLA/PCL) blends spread at the air/water interface is studied to identify the relative rate of hydrolytic degradation of each component when exposed to a basic subphase. As the hydrolysis time increases, the isotherm re…
The effect of a floating stearate monolayer on the formation of Mg−Al-hydrotalcite (Mg−Al-LDH) has been studied. A subphase was an aqueous solution of Mg(NO 3 ) 2 ·6H 2 O (1.6 × 10 - 3 M) and Al(NO 3 ) 3 ·6H 2 O (5.3 × 10 - 4 M) adjusted at pH = 10.5 by 1.0 M NaOH. Templating effects were studied in the following two…
Crystallization is an important industrial operation due to its wide application in chemical manufacturing processes. The size of crystals is important as it impacts on downstream operations, such as filtration, and is required for process control that aims at producing a product with a desired size. Knowledge of the…
General effective transport coefficients and the thermoelectric figure of merit $\mathrm{ZT}$ for anisotropic systems are derived. Sizable induced transverse fields on surfaces perpendicular to the current flow are shown to reduce the effective transport coefficients. A microscopic electronic model relevant for multiv…
The interaction between cellulosic material and benzophenone was studied by molecular modeling. A model of the crystalline part of a native microfibril was built from previously published coordinates of the Iβ allomorph. This model presents three faces, namely (200), (110), and (11̄0), of about the same surface area.…
The adsorption of lysozyme in phosphate buffer (10 - 2 M + NaCl 10 - 2 M) at pH 7.4 on silica was studied at different flow rates. We measured simultaneously as a function of time (i) the streaming potential between the extremities of the capillary (internal diameter, 0.530 mm; length, 22 cm) and (ii) the amount adsor…
We have prepared MCM-41 samples having good crystallinity and possessing a small amount of surface hydroxyl groups (0.48 OH nm - 2 ) through extensive aging of a mixed solution of silica and surfactant in the temperature range from 308 to 413 K. The MCM-41 sample thus prepared exhibits excellent resistance to water, a…
A parametrization algorithm to determine chord-length distributions (CLD) from small-angle scattering data is used to characterize details of the pore structure, pore size, and morphology of porous carbon materials. This approach is applied to various carbon processing procedures, such as steam activation, tempering,…
The linear absorption spectra and absolute resonance Raman excitation profiles of the “push-pull” chromophore julolidinemalononitrile have been measured in cyclohexane, 1,4-dioxane, dichloromethane, acetonitrile, and methanol solution at excitation wavelengths spanning the strong visible charge-transfer absorption ban…
Using tight-binding molecular dynamics and ab initio methods, we predict the existence of a novel quasi-one-dimensional Ni−Si form in which a Si nanotube is stabilized by an encapsulation of the Ni chain. The resulting structure is found to be metallic with finite DOS at the Fermi level. Our work follows the recent ex…
The hybridization of nanoparticle-labeled DNA targets to surface-attached DNA probes has been investigated. Scanning tunneling microscopy (STM) and Raman and Fourier transform infrared (FTIR) spectroscopy were used to elucidate surface morphology, coverage, and the presence of aggregates. The factors that affect surfa…
The resonant second-order ${G}^{\ensuremath{'}}$-band Raman spectra of isolated single-wall carbon nanotubes (SWNTs) exhibit an interesting resonance phenomenon, whereby the ${G}^{\ensuremath{'}}$ band for some special $(n,m)$ isolated SWNTs exhibits a two-peak structure, while for most SWNTs, the ${G}^{\ensuremath{'}…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPhosphorescent Pd Porphyrin−Dendrimers: Tuning Core Accessibility by Varying the Hydrophobicity of the Dendritic MatrixVladimir Rozhkov, David Wilson, and Sergei VinogradovView Author Information Department of Biochemistry and Bioph…
In situ attenuated total reflectance Fourier transform infrared (FTIR) measurements were shown to allow the online monitoring of supersaturation during solution crystallization processes, thus opening up new monitoring and control possibilities. With this aim in view, the monitoring of unseeded batch cooling solution…