Materials Literature
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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…
I describe a class of spin models with short-range plaquette interactions, whose static equilibrium properties are trivial, but which display glassy dynamics at low temperatures. These models have a dual description in terms of free defects subject to effective kinetic constraints, and are thus an explicit realization…
Calcination of mixtures of (c-C 5 H 9 ) 7 Si 7 O 9 (OH) 3, 1, and (c-C 5 H 9 ) 7 Si 7 O 12 Fe(tmeda), 2 (tmeda = N, N, N ‘, N ‘-tetramethylethylenediamine), led to microporous amorphous Fe−Si−O materials with adjustable iron content in the range 1−11 wt %. A set of different complementary techniques including N 2 phys…
This work evaluates the effects of different variables such as MII/MIII ratio (layer charge), interlayer anion (CO32− or Cl−) and nature of the trivalent cation (Al3+ or Fe3+) in the sorption of 2,4,6-trinitrophenol (TNP) by layered double hydroxides (LDH) [MII1 − xMIIIx(OH)2]An−x/n·mH2O (MII = Mg2+, MIII = Al3+ or Fe…
We determine the capillary attraction and equilibrium configurations of particles trapped at a liquid-fluid interface due to the pinning of their contact line. We calculate analytically the asymptotic interaction energy between two particles and, numerically, the multibody energy landscape for up to four contacting pa…
Vapor sensors using thin porous silicon (PS) Fabry-Pérot films were prepared and characterized. The detection method used in this work involves measurement of the intensity of reflected light from a microporous Si film as a function of analyte concentration. Analyte adsorption within the pores of the film causes the F…
We report the preparation of loadable ultrathin, multilayered polyelectrolyte/dendrimer films by the sequential electrostatic deposition of negatively charged poly(styrenesulfonate) (PSS) and a positively charged fourth generation poly(amidoamine) dendrimer (4G PAMAM). Multilayers were first constructed on planar supp…
Charge distribution in the insulating phase of $\ensuremath{\theta}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{RbZn}(\mathrm{SCN}{)}_{4}$ [BEDT-TTF denotes bis(ethylenedithiolo)tetrathiafulvalene] is investigated using the polarized Raman and infrared (IR) spectroscopy. Both of the Raman and I…
Multilayer films of nanoparticles were grown in a systematic and controlled manner layer-by-layer by alternating exposures of suitably functionalized substrates (glass, Au) to either poly(allylamine) and carboxylic acid-functionalized nanoparticles or to poly(styrene sulfonate) and arylamine-functionalized nanoparticl…
We report experimental measurements of the adsorption of methane and ethane, and binary mixtures of these components, on MCM-41. This adsorbent, which has a simple, regular pore structure and a chemically homogeneous surface, was used as a model system on which to evaluate methods for the prediction of adsorption equi…
We have studied the electronic structure of ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{O}$ using photoemission spectroscopy measurements and configuration-interaction (CI) calculations on a ${\mathrm{MnO}}_{4}$ cluster model. It is shown that the CI calculation can give a consistent description of the p…