Materials Literature
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Arc discharging carbon rods containing 8.8 wt% La 2 O 3 produces a carbonaceous deposit containing nano-particles (nm-size particles) consisting of graphite shells around core nano-crystals averaging 10-30 nm in diameter but sometimes 3-4 nm. Transmission electron microscopy, nm-size electron diffraction and electron…
The structure of n-fold rings in vitreous ${\mathrm{SiO}}_{2}$ is investigated using molecular-dynamics configurations. A recently developed interaction potential for ${\mathrm{SiO}}_{2}$ consisting of long-range Coulomb interactions, the effect of electronic polarizability, and three-body covalent forces is used in t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron correlation effects in hyperpolarizabilities of p-nitroanilineFiona Sim, Steven Chin, Michel Dupuis, and Julia E. RiceCite this: J. Phys. Chem. 1993, 97, 6, 1158–1163Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published ini…
Branden & Jones state, in Nature: `Protein crystallography is an exacting trade, and the results may contain errors that are difficult to identify. It is the crystallographer's responsibility to make sure that incorrect protein structures do not reach the literature.' [Branden & Jones. (1990). Nature (London), 343, 68…
The fracture behavior of Al 2 O 3 containing 5 vol% 0.15μm SiC particles was investigated using indentation techniques. A significant increase in strength was achieved by the addition of SiC particles to the base Al 2 O 3 . Specifically, the strength increased from 560 MPa for Al 2 O 3 to 760 MPa for the composite sam…
Preparation of high quality conducting poly( trans ‐TTTE) and poly( trans ‐BTTTE) by the electrochemical polymerization of oligothiophene derivatives such as trans ‐(thiophene‐2‐yl)‐2,2':5'2''‐terthiophene‐5‐yl)ethylene, trans ‐TTTE, and trans ‐(2,2'‐bithiophene‐5‐yl)‐2,2':5'2''‐terthiophene‐5‐yl)ethylene, trans ‐BTTT…
Abstract The doubly differential cross-section for weak inelastic scattering of waves or particles by manybody systems is derived in Born approximation and expressed in terms of the dynamic structure factor according to van Hove. The application of this very general scheme to scattering of neutrons, x-rays and high-en…
Abstract Single-crystal structure determinations of wolframite-type structures were performed using a diamond anvil cell with beryllium gaskets. Unit cell parameters of MgWO 4 , MnWO 4 and CdWO 4 were determined at several pressures up to 8.0 GPa and structure refinements were performed up to 6.0 GPa. The high pressur…
Employing photoluminescence (PL) spectroscopy, we have carried out a detailed study of the characteristics and origin of the 1.681 eV luminescence center in chemical-vapor-deposited (CVD) diamond films. In addition to the zero-phonon line (ZPL), the fine structure of the PL emission spectrum revealed vibronics corresp…
Abstract Na9[EuW10O36]·32H2O, obtained from aqueous solutions, crystallizes in space group Cc with a = 11.484(5), b = 23.020(7), c = 23.581(6) Å, β = 91.71(3)°, V = 6231(3) Å3, Mr = 3349.4, Dx = 3.57 Mg m−3, and Z = 4. A full-matrix least-squares refinement finally yields R = 0.070 and Rw = 0.086 for 6473 independent…
Abstract Functional aluminum alkoxides, such as Et 3– p Al(OCH 2 X) p , where p = 1,3 and X = a functional group, are very effective initiators for the (D, L)‐lactide polymerization in toluene at 70°C. The coordination‐insertion type of polymerization is living. Linear polyesters of a predictable molecular weight an…
Abstract β‐Chitin was isolated from squid pens, and the characteristic chemical and physical properties were elucidated in comparison with those of shrimp chitin, α‐chitin. Deacetylation behavior of the squid chitin was first studied to look into the reactivity of β‐chitin and also to establish an efficient procedure…
Abstract The mechanical behavior of glassy polymers is time and temperature dependent as evidenced by their viscoelastic and viscoplastic response to loading. The behavior is also known to depend strongly on the prior history of the material, changing with time and temperature without chemical intervention. In this in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoisomerization and second harmonic generation in disperse red one-doped and -functionalized poly(methyl methacrylate) filmsR. Loucif-Saibi, K. Nakatani, J. A. Delaire, M. Dumont, and Z. SekkatCite this: Chem. Mater. 1993, 5, 2, 229–236Publication Date (Print):February 1,…
We have applied unique types of carbon foams developed at Lawrence Livermore National Laboratory to make an "Aerocapacitor." The aerocapacitor is a high power‐density, high energy‐density, electrochemical double‐layer capacitor which uses carbon aerogels as electrodes. These electrodes possess very high surface area p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA luminescent silicon nanocrystal colloid via a high-temperature aerosol reactionK. A. Littau, P. J. Szajowski, A. J. Muller, A. R. Kortan, and L. E. BrusCite this: J. Phys. Chem. 1993, 97, 6, 1224–1230Publication Date (Print):February 1, 1993Publication History Published on…
I have carried out numerical first-principles calculations of the pressure dependence of the elastic moduli for several ordered structures in the aluminum-lithium system, specifically fcc Al, fcc and bcc Li, L${1}_{2}$${\mathrm{Al}}_{3}$Li, and an ordered fcc ${\mathrm{Al}}_{7}$Li supercell. The calculations were perf…
With the assumption that both size- and strain-broadened profiles of the pure-specimen function are described with a Voigt function, it is shown that the analysis of Fourier coefficients leads to the Warren–Averbach method of separation of size and strain contributions. The analysis of size coefficients shows that the…
A novel method was developed to prepare three-dimensional structures with desired shapes used as templates for cell transplantation. The produced biomaterials are highly porous with large surface/volume and provide the necessary space for attachment and proliferation of the transplanted cells. The processing technique…
The optical, electronic, and catalytic properties of semiconductor Q‐particles differ significantly from those of either the bulk materials or of the molecules, as the nanometer‐size particles exhibit effects due to quantum confinement. The methods of preparing these materials, their characterization, their properties…