Materials Literature
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The results of an analysis of thirteen different computer programs involving 11 participants from 10 countries on eight measured glow curves originating from LiF(TLD-100) have been compared. The programs use a shape of a single glow peak which varies from program to program. Generally speaking, the better the approxim…
Abstract Several important aspects relating to the mechanism of formation of protective Cr‐based oxide films on aluminum alloy 2024‐T3 generated from CrO 3 + NaF‐containing solutions were observed with electrochemical, AES and XPS measurements. Although the film deposition rate and surface composition were very much i…
This study examines the effect of transverse thickness on the in-plane thermal conductivity of single crystal, defect-free, thin metallic films. The imposed temperature gradient is along the film and the transport of thermal energy is predominantly due to free electron motion. The small size necessitates an evaluation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSoluble Polyimides with Polyalicyclic Structure.3. Polyimides from (4arH,8acH)-Decahydro-1t,4t:5c,8c-dimethanonaphthalene- 2t,3t,6c,7c-tetracarboxylic 2,3:6,7-DianhydrideMasatoshi Kusama, Toshihiko Matsumoto, and Toshikazu KurosakiCite this: Macromolecules 1994, 27, 5, 1117–…
An undercooled liquid exhibits crystalline fluctuations, some of which grow into crystal of macroscopic dimension, while smaller fluctuations disappear. We present a model which allows for exact analytic characterization of the inhomogeneous critical nucleus, the smallest fluctuation which will give rise to crystal gr…
The optical properties of trivalent chromium ions in ${\mathrm{La}}_{3}$${\mathrm{Ga}}_{5}$${\mathrm{SiO}}_{14}$ crystals have been investigated by means of absorption, emission, excitation, and lifetime measurements. The particular intermediate value of the octahedral crystal field Dq/B\ensuremath{\sim}2.5 causes the…
Abstract Raman and infrared spectra of solid benzyl alcohol and two partially deuterated homologues are reported for the first time. The internal vibrational modes and lattice modes of benzyl alcohol are assigned on the basis of isotopic wavenumber shifts. The spectra of solid benzyl alcohol at low temperatures are sh…
Recently we investigated the occurrence of static periodic stripes in a hybrid aligned nematic cell. Assuming that the tilt anchoring was stronger at the planar wall than at the homeotropic wall, we have found the critical thickness of the cell for the transition from planar to periodic alignment as a function of the…
Abstract In microcellular plastics, an unfoamed skin that is integral with the foamed core can be created by allowing the nucleating gas to diffuse from the surfaces of a gas saturated specimen prior to foaming. In this paper, a semi‐empirical model is proposed that predicts the skin thickness variation in microcellul…
The current understanding of radiation damage mechanisms in alumina produced by bombardment with energetic electrons, ions, or neutrons is reviewed with particular emphasis on the relative effects of displacement damage on the aluminum and oxygen sublattices. The displacement damage equations are presented and it is s…
Nanometer ‐ sized magnetic particles can be included into polypyrrole to produce composites by means of a novel method involving ferrofluids, in which a magnetic core such as γ‐Fe 2 O 3 is surrounded by an anionic complexing shell (see Figure). This organic coating, leading to the formation of a macroanion, allows the…
Abstract A simple means of modeling termination in free radical polymerizations of a large number of monomers over a wide variety of intermediate and high conversion conditions is presented. It is shown that monomers can be divided into two classes according to the qualitative variation of their termination rate coeff…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLamellar Thickening and the Equilibrium Melting Point of PolypropyleneKhaled Mezghani, R. Anderson Campbell, and Paul J. PhillipsCite this: Macromolecules 1994, 27, 4, 997–1002Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Resolution Electron Energy-Loss Studies of Hydrocarbon Formation from Methane Decomposition on Ru(0001) and Ru(11.hivin.20) CatalystsMing Cheng Wu and D. Wayne GoodmanCite this: J. Am. Chem. Soc. 1994, 116, 4, 1364–1371Publication Date (Print):February 1, 1994Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond strengths of transition metal diatomics: Zr2, YCo, YNi, ZrCo, ZrNi, NbCo, and NbNiCaleb A. Arrington, Thorsten Blume, Michael D. Morse, Mats Doverstaal, and Ulf SassenbergCite this: J. Phys. Chem. 1994, 98, 5, 1398–1406Publication Date (Print):February 1, 1994Publicatio…
The thermal decomposition sequence of chrysotile samples from New Zealand and Canada has been found by 29 Si and 25 Mg MAS NMR to be more complex than previously indicated by X-ray diffraction and electron optical studies. The greater part of the mineral dehydroxylates, producing a Mg-rich X-ray amorphous phase contai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Investigation and Energetics of Mullite Formation from Sol-Gel PrecursorsCorine Gerardin, S. Sundaresan, J. Benziger, and A. NavrotskyCite this: Chem. Mater. 1994, 6, 2, 160–170Publication Date (Print):February 1, 1994Publication History Published online1 May 2002…
Normal human dermis has been analyzed using stereological methods to estimate the quantitative modifications of collagen and elastic fibers in relation to age, sex, and body region. Forty-five skin biopsies from the trunk or the limbs of 26 males and 19 females of different age were fixed in glutaraldehyde and osmium…
Nematic liquid crystals confined to supramicrometer capillary tubes with homeotropic anchoring conditions are studied using optical polarizing microscopy. The resulting microscopy textures are sensitive to the molecular anchoring strength ${\mathit{W}}_{\mathrm{\ensuremath{\theta}}}$ and the saddle-splay surface elast…
Small diameter (< 6 mm) synthetic vascular grafts fail at a clinically unacceptable rate due in large part to their inherent thrombogenicity. The development of a new cellular lining on synthetic vascular grafts would most likely improve the patency rates observed for these grafts in small diameter positions. We have…