Materials Literature
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Phase transitions and the local structure of micrometric droplets of liquid gallium under pressure were studied by combining extended x-ray absorption fine structure, single-energy x-ray absorption detection (SEXAD), and energy-scanning x-ray diffraction (ESXD). Measurements were performed in a range of pressures and…
The nature of low-frequency magnetoelectric (ME) coupling has been investigated in bilayers of single crystal lead magnesium niobate-lead titanate (PMN-PT) and yttrium iron garnet (YIG). Samples with (001) PMN-PT and polycrystalline, single crystal, or epitaxial thin films of YIG were studied. The ME coupling is the w…
We have demonstrated how dielectric planar chiral surfaces can both modulate the intensity and change the polarization state of visible light diffracted from patterned surfaces. These effects are shown to be dependent on the sense of chirality of the surface and the input polarization state of the light. Individual di…
A laser reflection method has been developed and tested for analyzing the etching of porous silicon (PS) films. It allows in situ measurement and analysis of the time dependency of the etch rate, the thickness, the average porosity, the porosity profile, and the interface roughness. The interaction of an infrared lase…
Luminescent colloidal semiconductor nanocrystals (quantum dots) are robust inorganic fluoro phores that have the potential to circumvent some of the functional limitations encountered by organic dyes in sensing and biotechnological applications. Quantum dots exhibit size-dependent tunable, narrow fluorescence emission…
The syntheses, structures, and magnetic properties are reported of [Mn12O12(O2CPe(t))16(MeOH)4] (4), [Mn6O2(O2CH2)(O2CPe(t))11(HO2CPe(t))2(O2CMe)] (5), [Mn9O6(OH)(CO3)(O2CPe(t))12(H2O)2] (6), and [Mn4O2(O2CPe(t))6(bpy)2] (7, bpy = 2,2'-bipyridine), where Pe(t) = tert-pentyl (Pe(t)CO2H = 2,2-dimethylbutyric acid). Thes…
Although it is well-known that TiO2 incorporation can greatly improve the cyclic stability of V2O5, the influences of TiO2 addition on the Li+ intercalation properties of V2O5 remain an issue of debate in literature. In this paper, we report on a systematic investigation of the preparation and intercalation properties…
Abstract Maleic anhydride grafted polypropylene (PP‐ g ‐MA) and organically modified clay composites were prepared in a plasticorder. PP‐ g ‐MAs, including Polybond PB3150, Polybond PB3200, Polybond PB3000, and Epolene E43, with a wide range of maleic anhydride (MA) concentrations and molecular weights were used. The…
Explicit formulas are obtained to describe the buckling behavior of triple-walled carbon nanotubes (CNTs) that are embedded in an elastic matrix, with van der Waals (vdW) interaction taken into consideration. The investigation is based on the continuum shell theory in which the individual tube is treated as a cylindri…
We show that disorder can modify dramatically the effective magnetic response of a composite metamaterial including its specific property of negative refraction. We demonstrate that a relatively weak disorder in the parameters of the split-ring resonators can reduce and even completely eliminate the finite frequency r…
Mesoporous gold thin films on glass substrates were fabricated by sputtering of AuAl2 precursor films followed by a de-alloying etch. The resulting sponge-like Au films have very high internal surface area due to nanoscale pores and channels. Scattering is not significant and the optical properties for such nanostruct…
We report a strategy for patterning surfaces with high aspect ratio gold nanorods (Au NRs) by using a poly(dimethylsiloxane) (PDMS) stamp to microcontact print 3−5 nm diameter gold nanoparticle (Au NP) “seeds” onto mercaptan-functionalized Si/SiO x surfaces and subsequently grow the seeds into Au NRs via seed-mediated…
We report on ensemble Monte Carlo transport simulations for semiconducting, single-wall, zigzag carbon nanotubes. The basis for the Monte Carlo simulations is provided by electronic structure calculations within the framework of a simple tight-binding model that takes the effect of the tube curvature on the band struc…
Carefully selected combinations of directional forces can be used to rationally engineer crystals with particular anisotropic features. This approach has led to the generation of cleavable molecular crystals with parallel 15-Å channels by dipole-directed stacking of hydrogen-bonded sheets (see crystal structure). The…
The electron-phonon matrix elements are calculated for the radial breathing mode (RBM) and the $G$-band $A$ symmetry mode of single-wall carbon nanotubes. The RBM intensity decreases with increasing nanotube diameter and chiral angle. The RBM intensity at van Hove singular $k$ points is larger outside the two-dimensio…
Abstract Summary: The interaction of Cu 2+ with C, N and O moieties in nanocomposites containing copper ions complexed in poly(amidoamine‐organosilicon), PAMAMOS, dendrimer networks was characterized using near edge X‐ray absorption fine structure (NEXAFS). The effects on the 1s → π * and 1s → σ * orbital transitions…
Cu – Si O 2 – Si N x interconnects that were located 0.65–2.7-μm below the surface of silicon-integrated circuits were imaged in a scanning electron microscope and a transmission electron microscope with a scanning attachment by detecting backscattered electrons (BSEs) with an incident electron-beam energy (Eo) in the…
Abstract A series of manganese oxide‐loaded SBA‐15 (MnSBA‐ x h, x = 1, 2, 3, 4, 5, 6; h: hour(s)) mesoporous materials are synthesized via a facile, in‐situ reduction method with a surfactant template. The composite materials are characterized using Fourier‐transform infrared spectroscopy, X‐ray diffraction, N 2 sorpt…
Abstract Summary: Copolymers of ω ‐perfluorooctyalkyl acrylate C 8 F 17 ‐(CH 2 ) n′ OC(O)CHCH 2 with butyl acrylate were prepared by free radical polymerization. These compounds were characterized by 1 H and 19 F NMR spectroscopy. Thermal properties were evaluated by DSC and TGA analysis. By changing the fluorinated…
A new method for analyzing second-order phase transitions is presented and applied to the polaronic system La(0.7)Ca(0.3)MnO3. It utilizes heat capacity and thermal expansion data simultaneously to correctly predict the critical temperature's pressure dependence. Analysis of the critical phenomena reveals second-order…