Materials Literature
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β-Cyclodextrin (β-CD) inclusion compounds containing the lanthanide complexes Eu(NTA) 3 · x H 2 O and Gd(NTA) 3 · x H 2 O [NTA = 1-(2-naphthoyl)-3,3,3-trifluoroacetone)] were prepared by treating a saturated aqueous solution of β-CD with a solution of the complex in ethanol. The molar ratio of host to guest in the rea…
A diversity of zirconium-containing porous silicas of the MCM-41 type (Zr−MCM-41, ∞ ≥ Si/Zr ≥ 0.33) has been synthesized from aqueous solution using a cationic surfactant (CTABr = cetyltrimethylammonium bromide) as the structural directing agent, and starting from molecular atrane complexes of Zr and Si as precursors.…
A new electrochemical route to polythiophene (PT) films with an electrical conductivity between 800 and 1300 S cm–1 and a mechanical strength of 135 MPa is reported. The PT polymerization was performed in a BF3-ethyl ether solvated Lewis acid solution in the presence of the proton scavenger 2,6-di-tert-butylpyridine.…
Vertically aligned carbon nanotubes (CNTs) with controllable length and diameter fabricated by microwave plasma enhanced chemical vapor deposition (MPECVD) are of continuing interest for various applications. This paper describes the role of process gas composition as well as the pre-coating catalytic layer characteri…
A high-performance micro-patterned polarizing element has successfully been fabricated by in-plane anisotropic alignment of a chromonic lyotropic liquid crystal. Although the fabrication method is quite simple, the orientational order of the polarizing element obtained is high enough for practical usage. The Figure sh…
The present investigation focuses on the synthesis and application of a cross-linking agent that is compatible with the solubility characteristics of chitosan. A water-soluble, blocked-diisocyanate was prepared as a bisulfite adduct to 1,6-hexamethylene diisocyanate, which proved to be stable for several weeks in aque…
Selectively modified mesoporous silica has been infiltrated with Pt nanoparticles by a simple in-situ reduction method. The method is based on functionalizing the inside pore channels with highly reducing Si–H bonds, which results in a preferred growth of Pt nanoclusters (about 15 wt.-% on average) along the channels…
Cobalt-filled carbon nanotube composites (see Figure) with a high metal-filling ratio can be prepared by a simple and effective method. The length, diameter, and structure of the metal-filled nanotubes and the wall thickness of the plain carbon nanotubes can be easily controlled by the template used and synthesis cond…
Sugar-based gelator p -dodecanoyl-aminophenyl-β- d -glucopyranoside 1 has been shown to self-assemble in the presence of p -aminophenyl glucopyranoside 2 into double-helical fibers with diameters of 3−25 nm and lengths of several micrometers. The sol−gel polymerization of tetraethoxysilane (TEOS) was carried out using…
SmCl3 reacts with Me3SiCH2Li in THF yielding Sm(CH2SiMe3)3(THF)3 (1). The single crystal X-ray structural analyses of 1, Er(CH2SiMe3)3(THF)2 (2), Yb(CH2SiMe3)3(THF)2 (3), and Lu(CH2SiMe3)3(THF)2 (4) show the Sm atom in a fac-octahedral coordination and the heavier lanthanides Er, Yb, and Lu trigonal bipyramidally coor…
Previous calculations on n-type doping of diamond by P and S predicted that S has a shallower level and a higher solubility than P. Our first-principles calculations show that the opposite is true: Phosphorus impurity in diamond gives rise to a shallower donor level, and has a higher bulk solid solubility than sulphur…
A proteome of a model organism, Caenorhabditis elegans, was analyzed by an integrated liquid chromatography (LC)-based protein identification system, which was constructed by microscale two-dimensional liquid chromatography (2DLC) coupled with electrospray ionization (ESI) tandem mass spectrometry (MS/MS) on a high-re…
Field-emission currents from SiO2- or MgO-coated carbon nanotube (CNT) emitters are larger than for uncoated equivalents. Moreover the coated emitters exhibit lower turn-on fields and it is shown that the MgO or SiO2 films protect the CNT tips during field emission, which improves the lifetime stability of these emitt…
Single-crystalline Ag2Se nanowires have been successfully synthesized through a template-engaged topotactic reaction in which nanowires of trigonal selenium were transformed into Ag2Se by reacting with aqueous AgNO3 solutions at room temperature (RT). An interesting size-dependent transition between two crystal struct…
Stimulated emission (SE) was measured from two InGaN multiple quantum well (MQW) laser structures with different In compositions. SE threshold power densities (I_th) increased with increasing QW depth (x). Time-resolved differential transmission measurements mapped the carrier relaxation mechanisms and explained the d…
We present a practical algorithm for partially relaxing multiwell energy densities such as pertain to materials undergoing martensitic phase transitions. The algorithm is based on sequential lamination, but the evolution of the microstructure during a deformation process is required to satisfy a continuity constraint,…
We report a molecular dynamics simulation of a simple monatomic glass-forming liquid. It is shown that transition to deeper minima in the energy landscape under supercooling results in the formation of icosahedrally structured domains with distinctly slow diffusion which grow with cooling in a low-dimensional manner a…
With a Si(001) vicinal surface in mind, we study step wandering instability on a vicinal surface with an anisotropic surface diffusion whose orientation dependence alternates on each consecutive terrace. In a conserved system step wandering takes place with step-up adatom drift. Repulsive interaction between steps is…
New immobilization of the chiral Mn(salen) complex through the complexation of managanese by oxygen atoms of the phenoxyl groups grafted on the surface of MCM-41 leads to a markedly higher ee than for the free complex.
We study a classical double exchange magnet with direct antiferromagnetic superexchange coupling, J, between the localized spins. It is shown that the de-stabilization of the ferromagnetic ground state with increasing J leads to phase separation; the latter always preempts the spin-wave instability (softening of the m…