Materials Literature
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Semi-crystalline fluorinated polymers represent an interesting class of high-performing, melt-processible materials. Structure–properties relationships are discussed at a molecular level starting from the atomic properties of the fluorine atom. Their synthesis and microstructure are reported in detail. Further focus i…
The oxidation behavior of dense TiB 2 specimens was investigated. Hot‐pressed TiB 2 with 2.5 wt% Si 3 N 4 as a sintering aid was exposed to air at temperatures between 800° and 1200°C for up to 10 h. The TiB 2 exhibited two distinct oxidation behaviors depending on the temperature. At temperatures below 1000°C, parabo…
A combined process of electropolishing, focused-ion-beam lithography, and controlled anodization is used to fabricate anodic alumina films with ordered nanochannels. The ion beam is used to create a hexagonally close-packed lattice of concaves on a polished aluminum surface and the concaves act as pinning points for g…
A tape casting method for fabricating solid-oxide fuel cells (SOFCs) that are active for the direct oxidation of dry hydrocarbons is presented. The method relies on the inclusion of pyrolyzable pore formers in the anode green tape in order to produce a porous yttria-stabilized zirconia anode matrix. Wet impregnation w…
The size and size-distribution of CdS nanocrystallites is controlled by the microwave-assisted reaction of cadmium acetate with thiourea in N,N-dimethylformamide (DMF). The absorption onset of the CdS nanocrystallites shifts to longer wavelength with increasing irradiation time, indicating particle size growth under p…
High porosity carbons prepared from mesophase pitch with KOH etching to different extents were used to fabricate electrodes for electric double-layer capacitors. Nitrogen adsorption was used to characterize the porous structure of the carbon electrodes. The performance of the capacitors in 1 was investigated with volt…
A series of long chain (C10, C12, C15 and C18) 3,6-dialkylated phthalonitriles, prepared in 4 steps from thiophene, have been converted into the title phthalocyanines as metal-free and zinc derivatives. The symmetric macrocycles were characterised using 1H NMR, MALDI-TOF ms and solution phase electronic (UV-VIS) spect…
Basic facts are presented of the absorption of hydrogen gas by metals and the diffusion of hydrogen in metals. Specifically considered are crystalline metals without defects and lattice disorder (pure metals), low hydrogen concentrations and the possibility of high hydrogen gas pressures. The first introductory topic…
Rodriguez, Baker and co-workers (A. Chambers, C. Park, R. T. K. Baker and N. M. Rodriguez, J. Phys. Chem. B, 1998, 102, 4253; C. Park, C. D. Tan, R. Hidalgo, R. T. K. Baker and N. M. Rodriguez, Proc. 1998 US DOE Hydrogen Program Reiew, (http://www.eren.doe.gov/hydrogen/docs/25315toc.html); C. Park, P. E. Anderson, A.…
Four novel macromolecular MRI contrast agents, all of which had the same chemical composition but different molecular weights, were prepared using generation-3, -4, -5, and -6 polyamidoamine (PAMAM) dendrimers conjugated with a bifunctional diethylenetriaminepentaacetic acid derivative to change the blood retention, t…
The use of porous matrices to enable damage tolerance in ceramic composites has emerged as a new paradigm in high performance materials. This paradigm obviates the need for fiber coatings for the purpose of crack deflection, thereby providing opportunities for lower cost manufacturing relative to that of conventional…
Confocal Raman microspectrometry has been applied to the in situ study of an electrical double-layer capacitor involving activated carbon cloth electrodes and an organic electrolyte. The Raman spectra of the carbon electrodes have been recorded during the charge and discharge. The intensity variations of the G and D b…
The thermal stability and spectroscopic properties of Er 2 O 3 ‐doped TeO 2 –GeO 2 –ZnO–Na 2 O–Y 2 O 3 glasses for 1.5 μm fiber amplifiers were investigated. The thermal stability of the 75TeO 2 ·20ZnO· 5Na 2 O glass was improved by introducing GeO 2 and Y 2 O 3 . The radiative transition and the nonradiative transiti…
Poly(L-lactic acid) (PLA)-degrading Amycolatopsis sp. strains K104-1 and K104-2 were isolated by screening 300 soil samples for the ability to form clear zones on the PLA-emulsified mineral agar plates. Both of the strains assimilated >90% of emulsified 0.1% (wt/vol) PLA within 8 days under aerobic conditions. A novel…
In this paper, we show that dilute maleic acid, a dicarboxylic acid, hydrolyzes cellobiose, the repeat unit of cellulose, and the microcrystalline cellulose Avicel as effectively as dilute sulfuric acid but with minimal glucose degradation. Maleic acid, superior to other carboxylic acids reported in this paper, gives…
Yong-Ling Ruan, Danny J. Llewellyn, Robert T. Furbank, The Control of Single-Celled Cotton Fiber Elongation by Developmentally Reversible Gating of Plasmodesmata and Coordinated Expression of Sucrose and K⁺ Transporters and Expansin, The Plant Cell, Vol. 13, No. 1 (Jan., 2001), pp. 47-60
BACKGROUND: Resistance to chemotherapeutic agents and poor blood-brain barrier penetration are major limitations in the treatment of malignant glioma. To improve drug delivery across the blood-brain barrier, the authors used doxorubicin as liposomal encapsulated formulation (Caelyx, Scheringh-Plough, Munich, Germany)…
Research Article| January 01, 2001 Geochemical Stability of Natural Zeolites Steve J. Chipera; Steve J. Chipera Los Alamos National Laboratory, Mail Stop D469, Los Alamos, New Mexico 87545 Search for other works by this author on: GSW Google Scholar John A. Apps John A. Apps Lawrence Berkeley National Laboratory, Mail…
The effect of various electrochemical pre-treatment methods on the surface and electrochemical properties of screen-printed carbon paste electrodes (SPCE) prepared with three different commercial products was examined. It was observed that a positively charged redox couple, e.g., hexaammineruthenium(III), exhibited qu…
A new series of achiral five-ring banana-shaped compounds is presented which exhibit a cyano substituent in the 4-position of the central core. It follows from X-ray investigations and from NMR, microscopical and electro-optical measurements that all members of the series do not only form the chiral B2 phase character…