Materials Literature
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The rigorous Fourier modal method for crossed anisotropic gratings is extended to the analysis of second-harmonic generation in two-dimensionally periodic structures. The method takes the undepleted-pump approximation that uncouples the calculations of the fundamental and the second-harmonic fields. The effectiveness…
The specific heat is frequency dependent in highly viscous liquids. By solving the full one-dimensional thermoviscoelastic problem analytically it is shown that, because of thermal expansion and the fact that mechanical stresses relax on the same time scale as the enthalpy relaxes, the plane thermal-wave method does n…
Dinuclear titanium, zirconium, and hafnium oxide clusters, M2O2 and M2O4 (M = Ti, Zr, Hf) have been prepared and characterized by matrix isolation infrared spectroscopy and quantum chemical calculations. The M2O2 clusters were formed through the reactions of metal dimers and O2 in solid argon upon sample annealing. Th…
Abstract Dendritic core‐shell architectures were synthesized by simple melt reactions of polyethylenimine (PEI) with different fatty acids. These systems were investigated towards their ability to encapsulate various guest molecules. Parameters, such as the length of the attached alkyl chain, size of the polymer core,…
The transmission of incident $10--20\phantom{\rule{0.3em}{0ex}}\mathrm{keV}∕q$ ${\mathrm{Ar}}^{+}$, ${\mathrm{Ar}}^{3+}$, ${\mathrm{Ne}}^{3+}$, and ${\mathrm{Ne}}^{7+}$ ions in an ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ nanocapillary array was studied. The array consists of a dense distribution of pores typically $100\pha…
The electrochemistry of mixed-valent-containing vanadium-oxide nanotubes (VOx-NTs) is first reported. Using dodecylamine and hexadecylamine as templates, two kinds of VOx-NTs were synthesized and characterized. Both VOx-NTs contain V2O3, VO2 and V2O5 species. Dodecylamine-templated VOx-NTs (C12-VOx-NTs) are much more…
Tilted ZnO nanowires have been grown by high-pressure pulsed laser deposition (PLD) on m -plane sapphire without employing any catalyst species. The nanowires are inclined 30° with respect to the substrate normal and show well-defined epitaxial relationships with the m -plane sapphire substrate, the projection of the…
Attributed to its distinctive dahlia-flowerlike structure and already desirable size (usually <100 nm), carbon nanohorn assemblies (CNHs), a new member of the fullerene family, are a potential vehicle for intracellular delivery. This paper shows that isolated CNHs and nanoscale CNH agglomerates can be successfully iso…
Polypyrrole (PPy)/PB and PPy/Ag composite microtubes were synthesized in one pot by using methyl orange (MO) as a reactive self-degraded template. In contrast to reported conventional template approaches, the MO template did not need to be removed after polymerization. The formation mechanism, structural characteristi…
info:eu-repo/semantics/published
We report on self-assembly of a weak zwitterionic polymer poly(carboxybetaine), PCB5 within a polyelectrolyte multilayer film. Multilayer growth and ionization of carboxylic groups are monitored in situ using ATR-FTIR. Deposition of PCB5 within the film is contrasted for two pH regimes: (1) at slightly acidic pH value…
We present a neutron scattering investigation on a miscible blend of two polymers with greatly different glass-transition temperatures Tg. Under such conditions, the nearly frozen high-Tg component imposes a random environment on the mobile chain. The results demand the consideration of a distribution of heterogeneous…
We describe and realize an aligned carbon nanotube array based 'carbon nanotube fur (CNTF)' electrode. We removed an 800 µm long aligned carbon nanotube array from the silica substrate, and then pasted the array on a nickel foam current collector to obtain a CNTF electrode. CNTF's characteristics and electrochemical p…
We demonstrate here the utilization of ultrasonication during template-assisted electrodeposition to synthesize high quality one-dimensional nanostructures. Copper sulfide nanorods were synthesized “sonoelectrochemically” to achieve single-crystal nanorods with predominantly single stoichiometric composition (1.0:1.0…
Novel "tadpole"-like Fe3O4/multiwalled carbon nanotube (MWCNT) heterojunctions were successfully synthesized by position-selectively attaching Fe3O4 sphere on the tips of MWCNTs through a straightforward and effective polyol-medium solvothermal method. Transmission and scanning electron microscopy (TEM and SEM) and X-…
The dendritic crystal growth patterns that typically grow along principal crystallographic axes and have the hierarchical structure have been attracting much attention from scientists for several centuries. Here we report that the ZnO dendritic nanostructure as a new member of the ZnO family could be successfully prep…
DNA molecules in silicon dioxide-glass fluidic nanoslits spontaneously extend at the lateral sidewalls of the slit. The nanoslit geometry, however, physically confines polymer molecules to two spatial dimensions; further reduction in configurational entropy resulting in axially stretched molecules arises spontaneously…
The chemical properties of small gold clusters Au n with n up to 10 atoms were investigated using density functional theory (DFT). These clusters have planar structures, and we analyzed the effects of the planarity on the chemistry of the clusters. Using atomic hydrogen as a chemical probe, we found a strong site depe…
We describe a simple and inexpensive method to produce lotus leaf-like Cu-ferrite films on copper alloy engineering materials fabricated via a sol−gel process and chemical modification. The films show stable superhydrophobicity and magnetization, even in many corrosive solutions, such as acidic or basic solutions, and…
Three types of hierarchical morphologies, i.e., cylinders-in-lamella, lamellae-in-cylinder, and lamellae-in-sphere structures, have been identified for ABC star-shaped terpolymers by transmission electron microscopy and small-angle X-ray scattering. The samples are composed of polyisoprene (I), polystyrene (S), and po…