Materials Literature
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Point defects, including atom vacancies, adatom, and Stone-Wale defects, close to a (5,5) single-walled carbon nanotube (SWNT) open end were studied by density functional theory (DFT), semiempirical PM3 methods, and the empirical Brenner potential. It is found that defect stability increases as they become closer to t…
We report on results of the first realistic electronic structure calculations of the Pu-based PuCoGa5 superconductor based on the dynamical mean field theory. We find that dynamical correlations due to the local Coulomb interaction between Pu f-electrons lead to substantial modification of the electronic structure wit…
We present inelastic neutron scattering measurements on the intermetallic compounds Ce(Ru$_{1-x}$Fe$_x$)$_2$Ge$_2$ ($x$=0.65, 0.76 and 0.87). These compounds represent samples in a magnetically ordered phase, at a quantum critical point and in the heavy-fermion phase, respectively. We show that at high temperatures th…
We have developed the electron-phonon matrix element in single-wall carbon nanotubes by using the extended tight-binding model based on density functional theory. We calculate this matrix element to study the electron-phonon coupling for the radial breathing mode (RBM) and the $G$-band $A$ symmetry modes of single-wal…
A complex InAs/CdSe/ZnSe core/shell1/shell2 (CSS) structure is synthesized, where the intermediate CdSe buffer layer decreases strain between the InAs core and the ZnSe outer shell. This structure leads to significantly improved fluorescence quantum yield as compared to previously prepared core/shell structures and en…
Ferromagnetic shape memory alloys ${\mathrm{Ni}}_{2+x}{\mathrm{Mn}}_{1\ensuremath{-}x}\mathrm{Ga}$ were studied in the range of compositions $0.16\ensuremath{\leqslant}x\ensuremath{\leqslant}0.36$. The experimental phase diagram, constructed from differential scanning calorimetry, transport, and magnetic measurements,…
We have identified a new type of transition from extended to localized vibrational states in one-dimensional graded elastic chains of coupled harmonic oscillators, in which the vibrating masses or nearest-coupling force constants vary linearly along the chain. We found that the delocalization transition occurs at the…
Pulsed laser deposition (PLD) is a good method for growing high-quality functional oxide thin films because of the technical simplicity and the ease with which deposition can be switched from one material to another. However, the repeatability of film quality is often hard to achieve, especially when using several dif…
In this study, we explored the use of semiconductor quantum dots (QDs) as fluorescence labels in immunoassays for simultaneous detection of two species of foodborne pathogenic bacteria, Escherichia coli O157:H7 and Salmonella Typhimurium. QDs with different sizes can be excited with a single wavelength of light, resul…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTLarge Aqueous Aluminum Hydroxide MoleculesWilliam H. CaseyView Author Information Department of Chemistry and Department of Geology, University of California, Davis, California 95616 Cite this: Chem. Rev. 2006, 106, 1, 1–16Publication Date (Web):December 7, 2005Publication Histo…
Abstract A series of copolyamides of various compositions of nylon 6 and nylon 6,18 were produced. Increased resistance to organic solvents resulted from greater incorporation of nylon 6,18, as shown by decreasing solubility. High‐resolution solution NMR indicated there were four amide carbonyls that corresponded to t…
Abstract Blends and full IPNs' of poly(vinyl chloride) and polybutylmethacrylate (PBMA) have been synthesized and characterized with respect to their mechanical, thermomechanical, and morphological properties. Both the systems displayed a rise in the modulus and ultimate tensile strength and a consequent decreasing te…
Abstract The shear rheological properties of polystyrene (PS)/nano‐CaCO 3 composites were studied to determine the plasticization of nano‐CaCO 3 to PS. The composites were prepared by melt extrusion. A poly(styrene–butadiene–styrene) triblock copolymer (SBS), a poly(styrene–isoprene–styrene) triblock copolymer (SIS),…
Abstract A new method using high‐intensity ultrasonic waves, instead of peroxide‐aided reactive extrusion, was applied to modify a linear polypropylene into a branched structure. The ultrasonic waves induced chain scission and created reactive macromolecules of polypropylene successfully in the melt state without any…
Abstract Several new bisbenzocyclobutene‐terminated aromatic imides, 2,2′‐bis( N ‐4‐benzocyclobutenyl) phthalimide, 2,2′‐bis[4‐( N ‐4‐benzocyclobutenylphthalimide)]‐ether, 2,2′‐bis[4‐( N ‐4‐benzocyclobutenylphthalimide)]‐ketone, and 2,2′‐bis[4‐( N ‐4‐benzo cyclobutenylphthalimid‐4‐oxy) phenyl]‐propane, have been synth…
The diffusion and reaction problem in catalytic pellets of any shape subject to diffusive transport limitations is undertaken in this contribution. Effective reaction rates in three-dimensional (3D) catalysts can be evaluated through a series solution written in terms of powers of (1/Φ) when strong diffusion limitatio…
Small-angle neutron scattering (SANS) measurements were conducted on mixtures of deuterated and normal compositionally symmetric CPCPCPCPCPC (or (CP) 10 ) undecablock copolymers, containing poly(cyclohexylethylene) (C) and poly(ethylene- alt -propylene) (P) blocks. Deuterium labeling was achieved by hydrogenating and…
In terms of the approach to the integration of thermoelectric devices, we proposed a roll-type thermoelectric device. We studied the load characteristics of the thermoelectric microdevices using InN thin films prepared by reactive radio-frequency sputtering. It consisted 60-pair or 120-pair InN-chromel films, which we…
Abstract Resistance to burning is one of the most useful properties that can be imparted to leather. Pyrovatex CP is rich in phosphorus and nitrogen and has been successfully used as a flame‐retardant agent in the presence of etherified methylolated melamine (EMM). The effects of a finishing formulation containing Pyr…
We present an x-ray reflectivity study of molecularly thin films of liquid isobutane adsorbed on liquid glycerol. The glycerol-isobutane interface serves as a model system to investigate the influence of the substrate adsorbate interactions on both adsorption isotherms and capillary wave fluctuations. The measured sur…