Materials Literature
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The fluorescence characteristics of different Ce3+:Er3+-codoped fluoride host glasses, such as fluorozirconate and fluoroindate glass, are reported. It is shown that Ce3+ codoping into Er3+ doped fluoride glasses resulted in a quenching of Er3+ ions from the I11/24 to the I13/24 state, and the branching ratio for the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Conducting Poly(cyclophane) and Its Poly([2]-catenane)Davide L. Simone and Timothy M. SwagerView Author Information Department of Chemistry and Center for Materials Science and Engineering, Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, Mas…
The crystal structure and M-site populations of a series of micas-1M from miarolitic pegmatites that formed within host granitic rocks of the Precambrian, anorogenic Pikes Peak batholith, central Colorado, were determined by single-crystal X-ray diffraction data. Crystals fall in the polylithionitesiderophyllite- anni…
The effect of cocrystallization on the welding behavior of semicrystalline polymers was studied by means of T-peel testing at room temperature, using ultrahigh-molecular-weight polyethylene (UHMWPE) as a model polymer. Solution-cast films of UHMWPE have a very special morphology, consisting of regularly stacked, 107 Å…
The XRD patterns at ambient temperature and at 1500°C showed that the spinel in the Al 2 O 3 –MgO castables fired at 1500°C for 3 h has the higher peak intensity, compared to those in Al 2 O 3 –spinel castables; the interplanar distance in the set (311) is 2.43 Å for the spinel in Al 2 O 3 –MgO castables as well as th…
Illite-smectite (I-S) from Cambrian black shale of both early diagenetic and anchimetamorphic grade was investigated to determine the mechanism of the clay transformation. The layer sequences, the distribution of thicknesses of coherent scattering domains (CSDs), and the three-dimensional ordering were determined by X…
Surface-enhanced Raman scattering (SERS) spectra of many non-resonant biomolecules exhibit very broad vibrational bands. Using tyrosine (Tyr) as an example, we demonstrate that this broadening is inhomogeneous. We find that the single-molecule components behind the inhomogeneous distribution can be observed in experim…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTwo New Iodine-Capped Carbon RodsKunxiu Gao and Nancy S. GoroffView Author Information Department of Chemistry, State University of New York Stony Brook, New York 11794-3400 Cite this: J. Am. Chem. Soc. 2000, 122, 38, 9320–9321Publication Date (Web):September 9, 2000Pu…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTp-Hydroxyphenacyl Phototriggers: The Reactive Excited State of Phosphate PhotoreleasePeter G. Conrad, Richard S. Givens, Bruno Hellrung, Cheruvallil S. Rajesh, Markus Ramseier, and Jakob WirzView Author Information Institut für Physikalische Chemie der Universität Base…
The melts of aromatic carboxylic acids such as benzoic acid (BA) at 130–160 °C were shown to be excellent media for the one-pot synthesis of high molecular weight, completely cyclicized polyetherimides (PEIs) from the corresponding diamines and tetracarboxylic acid dianhydrides. According to the data on the cyclodehyd…
Bulk glasses GexSb0.05S0.95–x and GexSb0.1S0.9–x were prepared. Both the optical gap (E03) and the compactness (C) dependence against the mean coordination number 〈CN〉 indicates threshold-like behavior around Tanaka's threshold. Using simple covalent bond statistics the far infrared spectra are discussed in relation t…
Streptomyces coelicolor 1A and Pseudomonas citronellolis were able to degrade synthetic high-molecular-weight poly(cis-1,4-isoprene) and vulcanized natural rubber. Growth on the polymers was poor but significantly greater than that of the nondegrading strain Streptomyces lividans 1326 (control). Measurement of the mol…
Cyclodextrin-modified metal nanoparticles illustrate the role that protective organic shells can play in the modulation of the properties of nanoparticles, endowing them with molecular recognition abilities, as highlighted here. These nanocomposite materials are of fundamental interest for the organized self-assembly…
Nanocrystalline diamond films were grown by microwave plasma assisted chemical vapor deposition using N2 and CH4 as precursors. The microstructure of the films such as the diamond grain size, graphite content, and N incorporation, was controlled by introducing a small amount of hydrogen gas (0–10 sccm) in the growth.…
The smart use of intercalation chemistry and the forces of self-assembly now enable chemists to mimic nature in designing new materials that may revolutionize advanced technology industries. Nanocomposites exhibit new or significantly improved properties compared to those of the component phases owing to quantum confi…
An anhydrous alumina (Al 2 O 3 ) sol was prepared from aluminum isopropoxide and an organic solvent, using an acetic acid stabilizer. The complete conversion of the dried sol to α‐Al 2 O 3 was accomplished at a temperature of 950°C by a single transition via γ‐Al 2 O 3 . Al 2 O 3 that was deposited via dip coating res…
A novel three-dimensional (3D) ballistic deposition simulator 3D-FILMS has been developed for the modeling of thin film deposition and structure. The simulator features a ballistic transport algorithm to model incident species with angular distributions appropriate to physical vapor deposition systems. Two-tiered data…
Packende Verbindungen! Zwei Monomere eines bZIP-Proteins wurden an den basischen Bereichen über eine photoempfindliche Azobenzoleinheit zu einem Homodimer verknüpft. Dieses Dimer kann nach Bestrahlung mit Licht geeigneter Wellenlänge isomerisiert werden, wobei die beiden Isomere mit einer geringen (trans) oder hohen A…
Low concentrations of short chain aliphatic alcohols and organic acids and bases suppress single-bubble sonoluminescence (SBSL) in water. The degree of SL quenching increases with the length of the aliphatic end of the alcohol, and is related to the concentration of the alcohol at the bubble/water interface. The light…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. J. Feng, G. Sgalari, L. G. Leal; A theory for flowing nematic polymers with orientational dist…