Materials Literature
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In this work, we describe a simple inorganic route for synthesis of monodispersed W(18)O(49) nanorods with dimensional control in the quantum confinement regime. The single-crystalline W(18)O(49) nanorods can be prepared into stable colloidal solutions, or assembled into fibrous and/or paper forms by tuning process pa…
A proton microbeam produces ferromagnetic spots on a highly oriented graphite surface. The Figure shows the topography and the magnetic force microscopy (MFM) images obtained after irradiating the surface with a beam size of 1 μm × 1 μm and a dose of 0.098 nC μm –2 . The strength of the magnetic signal is only a facto…
The one-step selective synthesis of dimethoxymethane (DMM; CH 3 OCH 2 OCH 3 ) was achieved by oxidation of dimethyl ether (DME) or methanol (CH 3 OH) with O 2 at low temperatures (453−513 K) on unsupported and SiO 2 -supported heteropolyacids with Keggin structures [H 3+ n PV n Mo 12 - n O 40 ( n = 0−4)]. These materi…
Ultrasensitive to nanogaps: Raman scattering from pairs of silver nanoparticles bound together by hemoglobin varies strongly with incident polarization. Experiments and electrodynamic calculations (see graphic) show that only that part of the incident field that is polarized parallel to the dimer axis generates intens…
The distribution of local charge excesses (DLC) in metallic alloys, previously obtained as a result of the analysis of order N electronic structure calculations, is derived from a variational principle. A phenomenological Charge Excess Functional (CEF) theory is obtained which is determined by three concentration depe…
The nonlinear capacitance in doped nanotube junctions is calculated self consistently. It decreases as a function of the applied bias when the latter becomes larger than the pseudogap of the nanotube. For this device, one can deduce a relaxation time of about 0.1 femtosecond. Because of its negative differential resis…
Pure lithium amide (LiNH 2 ) decomposes to lithium imide and ammonia at temperatures above 300 °C. Lithium hydride, on the other hand, liberates hydrogen at temperatures above 550 °C. By thoroughly mixing these two substances and conducting temperature-programmed desorption (TPD), we noticed that hydrogen was produced…
Abstract This article describes the simultaneous diffusion of a migrant and a solvent in low density polyethylene (LDPE). The migrant (Irganox 1076) moves out of the slab, while the solvent (isooctane, n ‐heptane or cyclohexane) moves inwards. Solvent absorption was measured separately by following the increase of the…
AIMS: Recombinant Saccharomyces cerevisiae strains harbouring different levels of xylulokinase (XK) activity and effects of XK activity on utilization of xylulose were studied in batch and fed-batch cultures. METHODS AND RESULTS: The cloned xylulokinase gene (XKS1) from S. cerevisiae was expressed under the control of…
The Ru(2)(III,II) mixed-valent state is strongly stabilized in [(bpy)(2)Ru(mu-bttz)Ru(bpy)(2)](5+) (3(5+), bttz = 3,6-bis(2-thienyl)-1,2,4,5-tetrazine, as evident from lowered oxidation potentials and isolability, a strongly increased comproportionation constant K(c) = 10(16.6), and a high-energy intervalence charge t…
Abstract The uniaxial natural fabric from the tree Hildegardia populifolia was treated with 5% aqueous NaOH solution for 0, 2, 4, 6, and 8 h, and the resulting changes were analyzed by density, Fourier infrared spectroscopic, X‐ray, polarized microscopic, and scanning electron microscopic techniques. On alkali treatme…
We study the potential energy landscape explored during a compression-decompression cycle for the simple point charge extended model of water. During the cycle, the system changes from low density amorphous (LDA) ice to high density amorphous ice. After the cycle, the system does not return to the same region of the l…
A novel multicell apparatus is designed, constructed, and used to investigate crystal nucleation of vanillin in water/2-propanol solution (20 mass % of 2-propanol on a solute-free basis). The device contains 15 nucleation cells, with volumes of about 6 cm 3 each, in which the induction times for nucleation are measure…
Coordinating properties of acetoxybenziporphyrin, (TPBPOAc)H, have been investigated for a number of metal ions. Insertion of Ni, Pd, and Fe results in the cleavage of the acetoxy group leading to complexes (TPBPO)Ni(II), (TPBPO)Pd(II), and (TPBPO)Fe(III)X containing a M-O bond. No cleavage is observed with Zn(II) and…
The use of in-process analytical techniques to give direct access to the processing parameters needed for the optimization of crystallization processes for new materials and to achieve process robustness for existing processes is presented. An integrated 2-L batch crystallization system incorporating advanced in-proce…
Microfilaments have been reported to be polarized in a number of cell types based both on function and isoform composition. There is evidence that microfilaments are involved in the movement of vesicles and the polarized delivery of proteins to specialized membrane domains. We have investigated the composition of acti…
Abstract Cured rubber powder was successfully devulcanized under the application of high‐energy ball milling. An attempt was made to improve the efficiency of devulcanization with a phenolic antioxidant (2,6‐di‐ tert ‐butyl‐4‐methyl‐phenol). In addition, the grafting of virgin natural rubber to the surface of rubber p…
We report conventional ab initio and B3LYP/DFT calculations for the static electric (hyper)polarizability of small CdS clusters. Our results indicate a strong reduction of the (per atom) mean dipole polarizability with size, supporting the recent LDA findings by Troparevsky and Chelicowsky [ J. Chem. Phys . 2001, 114,…
Abstract 2,2′,3,3′‐Oxydiphthalic dianhydride (2,2′,3,3′‐ODPA) and 2,3,3′,4′‐ODPA were synthesized from 3‐chlorophthalic anhydride with 2,3‐xylenol and 3,4‐xylenol, respectively. Their structures were determined via single‐crystal X‐ray diffraction. A series of polyimides derived from isomeric ODPAs with several diamin…
Abstract Theoretical predictions of room‐temperature ferromagnetism in Mn‐doped GaN and other wide band gap semiconductors suggest that these materials might be useful for spintronic applications. In this short review, we summarize recent observations on the gap states of GaN:Mn, which make it impossible that the two…