Materials Literature
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Long-distance triplet state diffusion in a TiO2/palladium-porphyrin bilayer (see Figure) results in efficient photo-induced charge separation. The larger efficiency for the palladium porphyrin compared with the metal-free or zinc derivatives is attributed to the strong spin–orbit coupling in the former, resulting in s…
The microscopic dynamics in liquid gallium at melting has been studied by inelastic x-ray scattering. We demonstrate the existence of acousticlike modes up to wave vectors above one-half of the first maximum of the static structure factor, at variance with earlier results from inelastic neutron scattering [F. J. Berme…
Computer simulations are used to understand the molecular basis of the rheology changes in polymer melts when loaded with platelet filler particles, specifically when the polymer and nanofiller interact attractively. With decreasing temperature, there is increasing aggregation between chains and filler and an increase…
Abstract The solubility and diffusivity of ethylene in semicrystalline polyethylene were experimentally measured using a magnetic suspension microbalance. The sorption measurements were carried out at temperatures up to 80°C and pressures up to 66 atm. The experimentally measured solubilities were found to decrease wi…
The plane-wave pseudopotential method is used to calculate the high energy exciton states of large CdSe quantum rods, including spin−orbital coupling and screened electron−hole Coulomb interaction. Theoretical ground exciton energies of colloidal CdSe quanutm rods and wires are in good agreement with recent experiment…
A novel catalytic reaction using a trace of organic amine as the catalyst enables hydrolysis of the silicon–hydrogen groups on the fresh prepared porous silicon (PS), generating the hydroxyl-terminated surfaces without extensive oxidation of the Si–Si backbonds. The reactivity of the hydroxyl-terminated surfaces with…
Chemical bath deposition of ZnS thin films (CBD) in zinc acetate-thioacetamide (TAA) aqueous solutions has been studied in the temperature range between 50 and 90 °C. The rate of film growth is compared to that of homogeneous precipitation of ZnS. The film growth was found to proceed by accumulation of ZnS nanocrystal…
A basic understanding of the properties of thin polymer films is of fundamental importance for developing applications in nanotechnology. Results of energy and angle dispersive x-ray reflectivity measurements on polymer thin films as a function of temperature exhibit reversible negative thermal expansion below the gla…
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…