Materials Literature
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A novel polyelectrolyte (BiPE) bearing permanently charged quaternary ammonium groups as well as bipyridine ligands for metal ion recognition is presented that can be incorporated into ultrathin films either through electrostatic interactions or metal ion coordination. Conventional layer-by-layer assembly of BiPE with…
An aqueous solution containing ferric chloride, acetic acid and 2-hydroxypyridine results in the solid-state isolation of an unusual mixed-ligand trinuclear iron(III) complex [Fe3(μ3-O)(μ2-CH3COO)6(C5H5NO)2(H2O)]ClO4·4H2O, 1, where the iron-coordinated water ligand forms a hydrogen-bonded water tetramer with three oth…
Ordered mesoporous carbons composed of arrays of nanotubes have been synthesized using ordered mesoporous silica templates via catalytic chemical vapor deposition. The ordered carbons possess bimodal pores, namely, the pores arise from the “replica” of frameworks of the template and the pores correspond to carbon nano…
Two novel nonlinear optical side-chain dendronized polymers have been synthesized by using a simple and mild post-functionalization method to graft highly polarizable chromophores bearing crosslinkable dendrons as side chains to poly(4-hydroxystyrene). This approach provides the combined advantages of better poling ef…
Sol–gel reactions have been performed within porous polymer bead templates with diameters of 15 or 30 μm. Subsequent removal of the organic template gives porous silica and titania spheres. The Figure shows an example of a broken titania sphere and its inner porosity. This technique results in porous inorganic spheres…
We previously derived a theorem about the {\em coherent} quasielastic neutron-scattering signal from a $d$-dimensional lattice of $N$ molecules that are undergoing rotational jump diffusion (around an $n$-fold axis), assuming that there are no correlations between the molecules. In the present paper molecular correlat…
We consider a single-domain ferromagnetic particle with uniaxial anisotropy coupled to a single-domain soft ferromagnetic particle (superparamagnetic particle). The problem of thermally agitated magnetization reversal in this case can be reduced to the random magnetization dynamics of the first particle with an effect…
It is suggested that the spectrum of ion site energies in glasses exhibits a band gap, establishing an analogy between ion conducting glasses and intrinsic semiconductors. This implies that ion conduction in glasses takes place via vacancies and interstitial ions (as in crystals).
By combination of two special methods, i.e., persistent spectral hole burning and laser assisted nanoparticle preparation, the dephasing time T2 of surface plasmon excitation in silver nanoparticles was systematically investigated. A strong dependence of T2 on the plasmon energy is found which reflects the relevance o…
A new giant actuation mechanism is demonstrated for sheets of carbon single-wall nanotubes that produces a 3 % actuator stroke in the in-plane direction, and amplification to over 300 % in the thickness direction. Electrochemically generated gas bubbles form in the internal pores of the nanotube sheets (see Figure), p…
Organic conducting polymers can be synthesized inside the pores of a track-etch membrane, and the resulting hollow tubules are shown to have enhanced electrical properties compared to their corresponding bulk materials. The polymerization of monomers (e.g., pyrrole, thiophenes) inside the confined space of these pores…
We theoretically study the electronic transport of a nanowire partly irradiated under an external terahertz (THz) electromagnetic field. Although the electrons in the ballistic nanowires only suffer lateral collision with photons the reflection of electrons also takes place in this partly irradiated case. Using free-e…
Inverting scattering experiments to obtain effective interparticle interactions for particles in solution is generally a poorly conditioned problem. More accurate potentials can be obtained through the use of isosbestic points, values of k where the scattering intensity I(k) or the structure factor S(k) is invariant t…
Maximize efficiency and minimize pollution: the breakthrough technology of high temperature air combustion (HiTAC) holds the potential to overcome the limitations of conventional combustion and allow engineers to finally meet this long-standing imperative. Research has shown that HiTAC technology can provide simultane…
Nanostructured ZnS nanocables and nanotubes (see Figure) with a rectangular cross section have been synthesized by chemical reaction using as-synthesized ZnO nanobelts as a template. A small blue shift is observed for the ZnO–ZnS cable structures, suggesting a small quantum confinement effect. The template-assisted me…
Ordered mesoporous carbon rods have been obtained in high yield using silica rods as templates. The inorganic salts that are used for the synthesis of the silica templates control the morphology and adjust the wall structure of the mesoporous silica materials and thus of the final carbon rods. The Figure shows a TEM i…
Abstract The conductivities of blends of low‐density polyethylene and poly(4‐vinyl pyridine) (P4VP) were studied. The blends were synthesized by in situ sorption and thermal polymerization of 4‐vinylpyridine in low‐density polyethylene. They showed, after iodine doping, conductivities of 1.7 to 5.0 × 10 −7 S cm −1 at…
We report the generation of small Ni particles by the fragmentation of Ni tips during the growth process of vertically aligned carbon nanotubules at 500 °C. A high-voltage transmission electron microscopy study revealed the role of small Ni particles in the secondary growth of carbon nanotubules. The small Ni particle…
Magnetization relaxation and remanence measurements in the temperature range from 100 to 600 °C were performed in a Sm(Co0.75F0.12Cu0.10Zr0.03)7.6 alloy in order to estimate the activation volume V*. The coefficient of magnetic viscosity S is found to decrease with temperature up to 500 °C showing an increase in the w…
We provide evidence of phase separation in La0.45Sr0.55MnO3−δ using electron spin resonance, magnetic force microscopy (MFM), x-ray diffraction, and magnetic and transport measurements. The results reveal that ferromagnetic and antiferromagnetic phase coexist at low temperature and that ferromagnetic and paramagnetic…