Materials Literature
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The role of various quaternary ammonium-modified montmorillonites in epoxy/diamine nanocomposite formation is examined to further refine the criteria for selection of organic modifiers necessary to enable fabrication of thermoset resins containing nanoscale dispersions of inorganic phases. Utilization of a hydroxyl-su…
Protonated Ruddlesden−Popper tantalates and titanotantalates H 2 [A n - 1 B n O 3 n +1 ] (A = Na, Ca, Sr, La; B = Ta, Ti) that have acidic interlayer protons were exfoliated using tetra( n -butyl)ammonium hydroxide (TBA + OH - ). H 2 CaNaTa 3 O 10 forms both single sheets and tubular “scrolls” when reacted to make TBA…
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Tyvelose is a 3,6-dideoxyhexose found in the O -antigen of Yersinia pseudotuberculosis IVA and is the only member of this class of sugars to be produced directly from another 3,6-dideoxyhexose, paratose. The C-2 epimerization required for this conversion has been proposed to be catalyzed by CDP- d -tyvelose 2-epimeras…
Cationic fluorosurfactants complexed to maleic anhydride plasma polymer layers readily undergo surface reconstruction in response to their local liquid environment. Repetitive alternation between oleophobic and hydrophilic behavior is observed.
The $3p$ photoelectron spectra of Cr, Mn, Fe, and Co atoms have been studied experimentally and theoretically. The $3p$-$3d$ interaction in the final ionic state gives rise to an $\mathrm{LS}$ multiplet structure spanning a binding-energy range of around 20 eV. The prominent high-spin components at low binding energie…
We show that the oscillatory driving of crystal surfaces can induce pattern formation or smoothening. The driving force can be of quite different origin such as a pulsed laser beam, an electric field, or elasticity. Depending on driving conditions, step bunching and meandering, mound formation, or surface smoothening…
It is predicted that certain atomically ordered interfaces between some ferromagnetic metals (F) and semiconductors (S) should act as ideal spin filters that transmit electrons only from the majority spin bands or only from the minority spin bands of the F to the S at the Fermi energy, even for F with both majority an…
New nanoporous carbons with extremely high mesopore volumes and surface areas have been produced using silica nanoparticles as templates. The polymerization of resorcinol and formaldehyde (RF) in the presence of silica sol particles generated RF gel-silica nanocomposites. Carbonization followed by HF etching of silica…
The N -octadecanoyl- L -alanine Langmuir−Blodgett (LB) films deposited from aqueous subphases containing metal ions (Ag +, Zn 2+, Ca 2+, Cd 2+, Ni 2+, and La 3+ ) at their intrinsic pH values are investigated by use of FTIR spectroscopy. The results indicate that hydrogen bond and metal complex play an important role…
X-ray photoelectron spectroscopy was used to estimate the absolute amount of cationic polyelectrolytes that adsorbs on mica and cellulose surfaces in aqueous media. The calculation takes advantage of the knowledge of the mica crystal composition at the basal plane and its ion-exchange properties in aqueous solution. T…
Mass spectra of polystyrene and poly(methylsilsesquioxane)(PMSSQ) derived from methyltriethoxysilane(MTES) were obtained in the 100-1,000 Da range by laser desorption/ionization time-of-flight mass spectrometry using a graphite plate without a matrix. Clean mass spectra were obtained without interference from carbon c…
We report two new hydrogen-bonding-based routes for layer-by-layer fabrication of polymer/Au nanoparticle multilayer thin films. Two types of Au nanoparticles surface-modified with carboxyl groups or pyridine groups were prepared in nonaqueous solvents. In the first assembly route, we consecutively adsorbed poly(4-vin…
When cross-linked by heating or by gamma-irradiation and entrapped in cellulose, whey proteins can generate insoluble biofilms with good mechanical properties and high resistance to attack by proteolytic enzymes. Interchain cross-linking of proteins generated an increase in the puncture strength, and a decrease in wat…
The stabilized jellium model (SJM) provides us a method to calculate the volume changes of different simple metals as a function of the spin polarization, $ζ$, of the delocalized valence electrons. Our calculations show that for bulk metals, the equilibrium Wigner-Seitz (WS) radius, $\bar r_s(ζ)$, is always a n increa…
Pb(Zr 0.53 Ti 0.47 )O 3 (PZT) thin films were prepared on p-type Si(100) substrates with TiO 2 buffer layers. Both the PZT films and TiO 2 buffer layers were deposited by the pulsed laser deposition technique using a KrF excimer laser. The depth profile of the constituent elements observed by Auger electron spectromet…
We report an inelastic light scattering study of the effects of charge ordering on the spin, charge, and lattice dynamics of Bi1-xCaxMnO3 (x>0.5). We find that charge ordering results in anomalous phonon behavior, such as the appearance of "activated" modes. More significantly, however, the transition to the charge-or…
We studied the microscopic kinetics of the amorphous-liquid interface in supercooled laser-melt silicon by means of molecular dynamics computer simulations. The interface velocity was obtained as a function of temperature by direct simulation of the interface motion in an amorphous-liquid model system. The temperature…
Using a magneto-optical indicator film imaging technique and an x-ray topography, we have observed a strong correlation between magnetic and twin structure of a single crystal of La0.7Sr0.3MnO3 (LSMO). The correlation between magnetic and twin domains can be understood in terms of a rhombohedral deformation of the cub…
We propose a mechanism of photostructural changes in amorphous ${\mathrm{As}}_{2}{\mathrm{S}}_{3}$ ( $a\ensuremath{-}{\mathrm{As}}_{2}{\mathrm{S}}_{3}$) on the basis of ab initio molecular orbital calculations on clusters of atoms modeling the local structure of the amorphous system. We have found that trigonal ${\mat…