Materials Literature
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A lipid (1)-coated lipase can catalyze the oligomerization of diethoxydimethylsilane (DEDMS) in isooctane containing 2wt% water, where the polymerization occurs at the OH group of the coating lipid (1) in the enzyme cavity.
In an effort to understand the origins of the nearly constant loss in disordered materials, we report dielectric studies of a series of sodium germanate glasses, (Na2O)(x)(GeO2)(1-x) for x=0, 0.003, 0.01, 0.03, and 0.1 at temperatures between 85 and 700 K. Analysis of the conductivity scaling for these glasses demonst…
Single-walled carbon nanotubes (SWNTs) strongly adsorb macrocyclic tetraazaannulene complexes NiTMTAA and CuTMTAA from ethanol solutions, with a SWNT/complex mass ratio of ca. 5:4. According to the results of molecular mechanics modeling, this corresponds to dense monolayer coverage. A saddle-shaped conformation of th…
Amorphous hydrogenated carbon−germanium films (a-Ge X C Y:H) were fabricated by plasma chemical vapor deposition in an audio frequency (af) three-electrode reactor using tetramethylgermane (TMGe) as a source compound. Two types of the material, namely semiconducting (a-S) and insulating (a-I) films characterized by qu…
Diatoms are unicellular microalgae with intricate walls made from silica. In his Perspective, [Wetherbee][1] explains how these patterned walls are constructed. He highlights the report by [KrA¶ger][2] et al ., who show that key molecules in the silicification process, called silaffins, are highly phosphorylated in th…
Poly(D-lactic acid) (PDLA) and poly(L-lactic acid) (PLLA) macromonomers were synthesized for preparation of a novel cytocompatible polymer. The cytocompatible polymer was composed of 2-methacryloyloxyethyl phosphorylcholine (MPC), n-butyl methacrylate (BMA), and the enantiomeric PLLA (or PDLA) macromonomer. The degree…
An evolutionary algorithm called 'differential evolution' is combined with Monte Carlo simulation to determine and optimize models of disordered crystal structures. Requirements for successfully finding the parameters describing disorder from diffuse scattering data are discussed and the algorithm is applied to resolv…
In this paper we show how it is possible to control the nature and the efficiency of collective photophysical processes in a network composed of two different fluorescent units organized on the surface of silica nanoparticles. Such a structure is obtained by covering nanoparticles with a layer of dansyl moieties (Dns)…
Atom positions and anisotropic Debye-Waller factors of the rhombohedral phase of LaCrO(3) have been refined simultaneously with the low-order structure factors, using a structure-analysis method of convergent-beam electron diffraction (CBED) proposed by Tsuda & Tanaka [Acta Cryst. (1999), A55, 939-954]. The method is…
High-resolution x-ray rocking diffraction has been used to measure the spontaneous strain associated with the cubic–rhombohedral phase transition in LaAlO 3 in the range 10K ≤ T ≤ 750 K. The data are consistent with a second-order Landau-like model at high temperatures, with T C = 834(2) K. At lower temperatures, the…
Calcium doping levels of up to 20 % can be achieved for the La1−xCaxOCl1−x solid solution series. At the highest doping levels (x=0.2; see graph (•)), the conductivity of the solid solution is three orders of magnitude greater than that of undoped LaOCl (□). The potential for the design of new functional materials ste…
Trinuclear copper complexes have been obtained by using a 1,3,5-trihydroxybenzene ligand modified by attachment of pendant arms at the 2, 4, and 6 positions (see picture; XX=bipyridine, 2-formylphenolate). The m-phenylene linkage results in ferromagnetic interactions through spin polarization in these complexes.
An almost spherical cluster with a diameter of about 2.5 nm is formed by Ag atoms (blue), S2− ligands (yellow), and P atoms (green) of PnPr3 ligands in [Ag188S94(PnPr3)30] (see picture). The phosphane ligands from the spherical Ag2S cluster core point out like the spines of a hedgehog. The sulfur substructure is const…
Oriented by an electric field (but not otherwise), a lyotropic nematic phase of helical discotic 1 in dodecane exhibits second-harmonic generation, the intensity of which is affected by the helicity of the irradiating circularly polarized light. The change reverses sign when the polarity of the orienting electric fiel…
Three electrons can be accepted into the antibonding orbitals of the α,α′-{2,6-(iPr)2PhNC(Me)}2(C5H3N) ligand, so that reduction with [Li(naphthalenide)] yields the trianionic diamagnetic complex 2. Treatment with Li metal, a stronger reducing agent, gives a mixture of 2 and paramagnetic complex 1, which is thermally…
Tuned chemical conditions complemented with a set of treatments have been developed to enhance the thermal stability of transition metal oxide mesoporous thin films (up to 500 °C for TiO2 and 450 °C for ZrO2), allowing the formation of crack-free coatings presenting excellent optical quality (transmittance higher than…
Water-soluble species can be deposited into preformed, multilayered polyelectrolyte capsules, templated onto melamine formaldehyde particles, with high integrity. Efficient encapsulation of albumin within capsules formed from a poly(styrene sulfonate)/poly(allylamine hydrochloride) composite was achieved at pH values…
By means of the nonequilibrium Green function technique, the effect of spin-flip scatterings on the spin-dependent electrical transport in ferromagnet-insulator-ferromagnet (FM-I-FM) tunnel junctions is investigated. It is shown that Julliere's formula for the tunnel conductance must be modified when including the con…
The field-induced transition in one-dimensional S=1 Heisenberg antiferromagnet with single-ion anisotropy in the presence of a transverse magnetic field is obtained on the basis of the Schwinger boson mean-field theory. The behaviors of the specific heat and susceptibility as functions of temperature as well as the ap…
The effect of nonmagnetic impurities and the effective masses on the spin-dependent transport in a ferromagnet-normal metal-ferromagnet junction is investigated on the basis of a two-band model. Our results show that impurities and the effective masses of electrons in two ferromagnetic electrodes have remarkable effec…