Materials Literature
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We describe the structure and dynamical behavior of a homogeneous mixture of hairy nanospheres, i.e., polyorganosiloxane microgels grafted with polystyrene chains, and linear polystyrene chains. Previously, it has been found that such mixtures are only homogeneous if the molecular weight of the polymer hairs is at lea…
Acid−base properties of alumina-supported rare-earth oxides (Ln/Al 2 O 3; Ln = La, Ce, Eu, Tb, and Yb) were investigated with α-pinene isomerization, 2-butanol decomposition, and temperature-programmed desorption and FTIR techniques. The structural characterization was carried out by means of XRD, Raman, and XAFS spec…
New Dion−Jacobson-type layered perovskite oxyfluorides, ASrNb 2 O 6 F (A = Li, Na, and Rb), have been prepared by conventional solid-state reaction, and their fluorine distribution in an anion sublattice was studied by performing 19 F MAS NMR spectroscopic analyses and lattice energy calculations to probe the evolutio…
The synthesis, crystal structure, and characterization of a non-centrosymmetric oxide, TeSeO4, are reported. The material was synthesized by combining TeO2 and SeO2 in a quartz tube and heating at 370 degrees C. TeSeO4 has a three-dimensional structure containing [SeO(3/2)](+) cations linked to [TeO(5/2)](-) anions. B…
Several mechanisms for the peroxide oxidation of organosilanes to alcohols are compared by quantum chemical calculations, including solvation with the PCM method. Without doubt, the reaction proceeds via anionic, pentacoordinate silicate species, but a profound difference is found between in vacuo and solvated reactio…
Enantiomeric poly(lactide)s were assembled on a quartz crystal microbalance (QCM) substrate, which detects the mass of the polymers from the frequency shift, following immersion of QCM into alternating acetonitrile solutions. A quantitative QCM analysis at each step and a differential scanning calorimetric study of th…
The morphological changes during the quasi-isothermal melt crystallization of a linear polyethylene sample at 126 °C were monitored by synchrotron WAXD and SAXS and compared to TMDSC data. A blocklike temperature-profile with an amplitude of 1 °C and a period of 2 min was applied. AFM at room temperature reveals lamel…
We have studied the characteristic features of viscoelastic phase separation in three dimensions by using numerical simulations, focusing on the morphological development. The Langevin-type equations of a two-fluid model, which includes both bulk and shear viscoelastic stresses, are solved numerically. The origin of p…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEnhanced Triple Helix Stability of Collagen Peptides with 4R-Aminoprolyl (Amp) Residues: Relative Roles of Electrostatic and Hydrogen Bonding EffectsI. Ramesh Babu and Krishna N. GaneshView Author Information Division of Organic Chemistry (Synthesis) National Chemical…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Synthesis of Novel Expanded Calixphyrins: Anion Binding Properties of a Calix[6]phyrin with a Deep CavityChristophe Bucher, Rebecca S. Zimmerman, Vincent Lynch, Vladimir Král, and Jonathan L. Sessler…
Dry reverse micelles of the anionic twin-tailed surfactant bis(2-ethylhexyl) sulfosuccinate (AOT) dissolved in nonpolar solvents spontaneously form an organogel when p-chlorophenol is added in a 1:1 AOT:phenol molar ratio. The solvents used were benzene, toluene, m-xylene, 2,2,4-trimethylpentane (isooctane), decane, d…
Thermogravimetry has been used to study the kinetics of the thermal dissociation of solid and liquid ammonium nitrate. Model-fitting and model-free kinetic methods have been applied to the sets of isothermal and nonisothermal measurements to derive kinetic characteristics of the processes. The application of the model…
Homopolymer and block amphiphilic polymer brushes on silicon wafers have been successfully prepared by combining the self-assembled monolayer of initiator and atom transfer radical polymerization (ATRP). Two methods for self-assembly of initiator monolayer were compared: One was to treat the silicon surface with 6-((2…
Low molecular weight poly(ethylene glycol) silanes (PEG silanes) have been grafted onto the surface of silicon wafers in a one-step procedure yielding ultrathin and stable PEG monolayers. Structural investigation by means of X-ray reflectivity provided data on the thickness of the PEG monolayers. The layer thickness v…
We report here a systematic XRD/FTIR/CHN/ICP investigation for structural transformation of hydrotalcite-like compounds Mg 1- x Al x (OH) 2 (NO 3 ) x · n H 2 O as a continuous function of nitrate anions ( x = 0.18−0.34). With seven finely divided steps in x value, a clear relationship between basal spacing and nitrate…
We have prepared a novel material, consisting of Pt particles supported on purified single-walled carbon nanotubes (SWNTs), representing the first reported metal-loaded SWNT material. The material contains 10 wt % Pt on entangled SWNT bundles consisting of 20−100 nanotubes each. The average Pt particle size is 1−2 nm.…
We have performed temperature-dependent ultrahigh-resolution $(\ensuremath{\Delta}E\ensuremath{\sim}7\mathrm{meV})$ photoemission spectroscopy on ${\mathrm{CoS}}_{2}$ across the para- to ferromagnetic transition and found a remarkable temperature-induced spectral change near ${E}_{F}.$ Comparison with the band-structu…
To understand how dislocations form ordered structures during the deformation of metals, we perform computer simulation studies of the dynamics and patterning of screw dislocations in two dimensions. The simulation is carried out using an idealized atomistic model with anti-plane displacements only; we show that this…
A method of constructing <30-nanometer structures in close proximity with precise spacings is presented that uses the step-by-step application of organic molecules and metal ions as size-controlled resists on predetermined patterns, such as those formed by electron-beam lithography. The organic molecules serve as a ru…
The mechanisms of photo-induced microstructures in an azobenzene polymer film are presented. They are based on the spatial periodic modulation of optical intensity and the photoisomerization of azobenzene molecules with the movement of main chains. Experiment and theory jointly point out the possibility of photo-induc…