Materials Literature
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Full electrodynamic analysis of self-similar cascades of plasmonic nanospheres (nanolenses) that exhibit nanofocusing is performed. Electrodynamic resonances are identified and a significant local field enhancement (by a factor of hundreds) is found for different sizes and fractal ratios of the cascade system, and for…
Octopod-like PbSe structures with eight symmetric arms of 1.0−3.0 µm in length have been hydrothermally synthesized without any surfactant. Keeping the other conditions the same, only by changing the molar ratio of NaOH/Pb(NO 3 ) 2 from 40 to 5, quasi-spherical nanoparticles were obtained. As poly(vinyl pyrrolidone) (…
Subwavelength imaging can be obtained with alternately layered metallodielectric films structure, even when the permittivity of metal and dielectric are not matched. This occurs as the effective transversal permittivity tends to be zero or the vertical one approaches infinity, depending on the permittivity value of th…
A method is presented that allows fatigue life predictions on the basis of creep life data. The approach is based on the assumption that the time-dependent failure of polymers is determined by the intrinsic strain softening that is initiated when a critical threshold value of the plastic strain is surpassed. To facili…
Multilayer heterostructured films of two different nanosheets, semiconducting Ti 0.91 O 2 nanosheets and redoxable MnO 2 nanosheets, were fabricated by the layer-by-layer sequential adsorption method using a polyelectrolyte as a linker. Successful deposition of these two nanosheets in various sequences was confirmed b…
Temperature dependence of acoustic behaviors and quasielastic central peaks (CPs) of $\mathrm{Pb}[{({\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3})}_{x}{\mathrm{Ti}}_{1\ensuremath{-}x}]{\mathrm{O}}_{3}$ $(\mathrm{PZN}\text{\ensuremath{-}}x\mathrm{PT})$ single crystals with $x=4.5%$ and 9% have been investigated in a temperatu…
The structure of individual nanodiamond grains produced by the detonation of carbon-based explosives has been studied with a high-vacuum aberration-corrected electron microscope. Many grains show a well-resolved cubic diamond lattice with negligible contamination, thereby demonstrating that the non-diamond shell, univ…
Long-term failure under constant or cyclic load is governed by the same process as short-term failure at constant rate of deformation. Failure proves to originate from the polymer’s intrinsic deformation behavior, more particularly the true strain softening after yield, which inherently leads to the initiation of loca…
Temperature- and $x$-dependent Raman scattering studies of the charge-density-wave (CDW) amplitude modes in ${\mathrm{Cu}}_{x}{\mathrm{TiSe}}_{2}$ show that the amplitude mode frequency ${\ensuremath{\omega}}_{0}$ exhibits identical power-law scaling with the reduced temperature $T/{T}_{\mathrm{CDW}}$ and the reduced…
Ultrafine or fine titanium dioxide (TiO(2)) particles are widely used in the production of white pigments, for sunscreens, and in cleanup techniques. However, currently knowledge is deficient concerning cellular responses to these particles. The study evaluated and compared the biological activity of ultrafine and fin…
The photoluminescence (PL) of 2D monolayers of CdSe/CdS/ZnS semiconductor nanocrystals (NCs) deposited on gold substrates and incorporated into electrochemical cells has been studied. By combining simultaneous cyclic voltammetry and confocal microscopy it is demonstrated that when a positive potential is applied to th…
We first describe the synthesis of novel and highly porous boron nitride (BN) nanospheres (100-400 nm o.d.) that exhibit a rough surface consisting of open BN nanocones and corrugated BN ribbons. The material was produced by reacting B2O3 with nanoporous carbon spheres under nitrogen at ca. 1750 degrees C. The BN nano…
Differences in surface and structural properties, thermal stability and oxygen storage capability (OSC) were investigated from different interactions between Ce 0.7 Zr 0.3 O 2 and Al 2 O 3 in mixed ceria−zirconia−alumina oxides. Physical techniques such as X-ray diffraction (XRD), BET and pore volume measurement, elec…
Diiodobutadiyne forms cocrystals with bis(pyridyl)oxalamides in which the diyne alignment is near the ideal parameters for topochemical polymerization to the ordered conjugated polymer, poly(diiododiacetylene) (PIDA). Nonetheless, previous efforts to induce polymerization in these samples via heat or irradiation were…
Self-assembled layers of alkyl chains grafted onto the surfaces of layered silicates, metal, and oxidic nanoparticles are utilized to control interactions with external media by tuning the packing density of the chains on the surface, head group functionality, and chain length. Characterization through experiment and…
In situ Raman spectroscopy and linear sweep voltammetry were used to characterize graphite formation on Ni/YSZ cermet anodes in solid oxide fuel cells (SOFCs) operating at 715 °C. The membrane electrode assemblies were run continuously with Ar-diluted H 2 and exposed to intermittent bursts of hydrocarbons. The appeara…
When heated in a rapid thermal processor at 350 °C in air, cobalt thin (50 nm thick) films were transformed into Co(3)O(4) nanorods in minutes. The nanorods are single-crystalline and are typically several hundred nanometers long and several tens of nanometers in diameter. They exhibited room-temperature photoluminesc…
Seeds of change: An unusually fast cation-exchange reaction at the nanoscale is an efficient tool for precise control of the nucleation of nanocrystals. As a model system, 3.2–14-nm PbSe nanocrystals are produced by the nucleation reaction of Pb2+ with transient SnSe nuclei (see picture). The synthesis allows surface…
Feedstock and byproduct diffusion in the root growth of aligned carbon nanotube arrays is discussed. A non-dimensional modulus is proposed to differentiate catalyst-poisoning controlled growth deceleration from one which is diffusion controlled. It is found that, at the current stage, aligned multiwalled carbon nanotu…
The heme protein, cytochrome c (Cc) has been studied using tip-enhanced Raman spectroscopy (TERS). By virtue of its sensitivity and superior spatial resolution, TERS detected both the heme and amino acid vibrational bands of Cc using resonance excitation at 532 nm. This is in contrast to conventional surface-enhanced…