Materials Literature
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Silver nanobars with rectangular side facets and an average aspect ratio of 2.7 have been synthesized by modifying the concentration of bromide added to a polyol synthesis. Subsequent rounding of nanobars transformed them into nanorice. Due to their anisotropy, nanobars and nanorice exhibit two plasmon resonance peaks…
We study from first principles the magnetism in graphene induced by single carbon atom defects. For two types of defects considered in our study, the hydrogen chemisorption defect and the vacancy defect, the itinerant magnetism due to the defect-induced extended states has been observed. Calculated magnetic moments ar…
Abstract On the Identity of a so‐called Ammonium Carbonate Sample Commercial samples of so‐called “ammionum carbonate” are shown to contain ammonium carbamate rather than ammonium carbonate. In fact samples may contain varying quantities of α‐ and β‐(NH 4 )(CO 2 NH 2 ), of which only the α‐phase is reported in the lit…
Abstract A novel heterospin complex containing both Ni II and nitroxide radical ligands: [Ni(salox) 2 (NIT4Py) 2 ] ( 1 ) (salox = salicylaldoxime, NIT4Py = 2‐(4′‐pyridyl)‐4,4,5,5‐ tetramethyl‐imidazoline‐1‐oxyl‐3‐oxide) has been synthesized and structurally characterized. The structure consists of neutral Ni(salox) 2…
In the title compound, [Cu(C44H28N4)], the copper ion is located at the center of the centrosymmetric and perfectly planar porphyrin ring.
Frozen solutions of the single molecule magnet ${\mathrm{Mn}}_{12}\mathrm{Piv}$ ($\mathrm{Piv}=\text{pivalate}$ or trimethylacetate) are studied by magnetization and magnetic resonance investigations. ac magnetic susceptibility measurements show that the system is stable in solution. Interestingly, the barrier and pre…
We report the effect of aluminum on the formation and structure of silica nanoparticles formed in basic solutions of small organic and inorganic cations using a combination of small-angle X-ray scattering, conductivity, pH, and 27Al NMR spectroscopy methods. At low silica concentrations, our observations agree with pr…
Solid solutions BiMn 1 - x Sc x O 3 (0 ≤ x ≤ 1) were prepared at 6 GPa and 1383−1443 K. Selected area and convergent beam electron diffraction showed that BiMn 0.9 Sc 0.1 O 3 crystallizes in the centrosymmetric space group C 2/ c at room temperature. The structure parameters of BiMn 0.9 Sc 0.1 O 3 were refined by the…
Abstract X‐ray photoelectron spectroscopy (XPS) was used to examine the corrosion films formed on electroless nickel (EN) deposits prepared in an EN solution containing two different types and concentrations of bath stabilizers in Ar‐purged and oxygenated neutral 5% NaCl solution. Two distinctive corrosion films were…
Most of the $^{2S+1}L_{J}$ multiplets of the ${\mathrm{Nd}}^{3+}$ ion $(4{f}^{3})$ in ${\mathrm{Bi}}_{4}{\mathrm{Ge}}_{3}{\mathrm{O}}_{12}$ and ${\mathrm{Bi}}_{4}{\mathrm{Si}}_{3}{\mathrm{O}}_{12}$ single crystals have been experimentally observed in the UV, visible, and NIR spectroscopic regions. The majority of the…
There is considerable interest in the mechanics of carbon nanostructures, such as carbon nanotubes and fullerenes, and the manner of their interactions at the intermolecular level. Medical applications include the use of carbon nanotubes for targeted drug and gene delivery, for which issues relating to the acceptance…
Experimental reflection electron energy loss spectra from silicon dioxide are excited by electrons with energy ranging from $90\phantom{\rule{0.3em}{0ex}}\mathrm{eV}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}2\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$. A Monte Carlo simulation, shortly described, is…
Properties of dirhodium catalysts with cyclometalated aryl phosphine ligands have been studied. We report here the study of the acid-base reaction of Rh2(RCO2)2(PC)2(H2O)2 catalysts (PC = cyclometalated aryl phosphine) with different Lewis bases. The determination of the equilibrium constants of these reactions can be…
Azobenzene polymer thin films are known to spontaneously generate surface patterns in response to incident light gradients. This peculiar process is investigated in terms of the dynamics of the various azobenzene photomotions, which occur on different length scales. In particular, the formation and thermal erasure of…
The layer-by-layer buildup of chitosan/hyaluronan (CH/HA) and poly(l-lysine)/hyaluronan (PLL/HA) multilayers was followed on a quartz crystal resonator (QCR) in different ionic strengths and at different temperatures. These polyelectrolytes were chosen to demonstrate the method whereby useful information is retrieved…
Nematic liquid crystals confined in a cylindrical capillary and subjected to strong homeotropic anchoring conditions is a long-studied fundamental problem that uniquely incorporates nonlinearity, topological stability, defects, and texture physics. The observed and predicted textures that continue to be investigated i…
Poly(vinyl acetate) (PVAc)/silicate nanocomposites have been prepared using a novel surfactant-free method comprising a copolymer of 2-(acryloxyethyl)trimethylammonium chloride (AETMC) and vinyl acetate (VAc) as the modifier for layered silicates. The nanocomposites maintained the exfoliated morphology even at silicat…
Liquid-crystalline (LC) phase behavior and photoinduction of optical anisotropy in the ionic self-assembly complex 4-(4-diethylaminophenylazo) benzenesulfonate-dimethyldidodecylammonium $(\mathrm{EO}\text{\ensuremath{-}}{\mathrm{C}}_{12}\mathrm{D})$ has been investigated by polarized light microscopy, differential sca…
Experiments have shown that thermal stability of nanoscale titania is significantly enhanced by the presence of low concentration yttrium dopants, but the mechanism of this effect is unclear. We present extended x-ray fine structure and wide-angle x-ray scattering measurements showing that yttrium is not incorporated…
A new approach for the preparation of a biochip on porous silicon and the application of the biochip for detection of small molecule-protein interactions with desorption/ionization on porous silicon (DIOS) was demonstrated. The galvanostatically etched porous silicon substrates were chemically modified firstly to yiel…