Materials Literature
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Abstract The pressure‐volume‐temperature properties of poly(ether ether ketone) (PEEK) were studied experimentally at temperatures of 400°C and pressures to 200 MPa. Specific volume data were fitted successfully to the empirical Tait equation for T < T g and T > T m and to the theoretical Simha‐Somcynsky equatio…
Abstract Tensile specimens of isotactic polypropylene, initially crystallized in the β‐form with high purity, were tested at various temperatures. It was observed by WAXD that the most important phenomenon occurring in the course of a tensile test is the β‐smectic transformation for specimens drawn at lower temperatur…
The hysteresis effects of fluids confined in porous media are studied by means of a new microscopic model. We consider a slitlike pore of infinite area and finite height. In contrast to the unbounded parallel-plate case, the new model allows the formation and the disappearance of curved menisci at the open ends of the…
The distribution of cations between octahedral and tetrahedral sites in Fe3O4-FeAl2O4, Fe3O4-MgFe2O4, and Fe3O4-MgAl2O4 solid solutions has been detrmined in situ at 600°C to 1400°C and 1-atm pressure. The joint Fe3O4-MgFe2O4 fits reasonably well to either the simple constant KFe2+-Fe3+Cd and KMg-Fe3+Cd model (Navrots…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArtificial photosynthesis of .beta.-ketocarboxylic acids from carbon dioxide and ketones via enolate complexes of aluminum porphyrinYasuhiro Hirai, Takuzo Aida, and Shohei InoueCite this: J. Am. Chem. Soc. 1989, 111, 8, 3062–3063Publication Date (Print):April 1, 1989Publicat…
The sequence of precipitation and its kinetics in 17–4 PH (precipitation hardening) stainless steel were studied by observing the electrical resistivity and microstructure of the alloy during isothermal aging at various temperatures in the range 320–600°C. By the absence of an incubation period for the onset of precip…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate minimum in solution crystallization of long paraffinsS. J. Organ, G. Ungar, and A. KellerCite this: Macromolecules 1989, 22, 4, 1995–2000Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published inissue 1 April 1989https://pubs.acs.or…
We investigate functions u: \mathbf R^n → \mathbf R which minimize a variational integral \int \mathrm{F}(x,\:u(x),u_{x}(x))dx where \mathrm F: \mathbf R^n × \mathbf R × \mathbf R^n → \mathbf R is periodic in (x, u) \in \mathbf R^{n + 1} and uniformly convex in u_x \in \mathbf R^n . We restrict attention to non-selfin…
Dielectric properties and structural characteristics of BaTiO 3 ceramics are significantly influenced by small addition (2 wt%) of ZrO 2 . SEM and TEM observations revealed enhanced microstructural uniformity and retarded grain growth depending on sintering temperature. Above 1320°C, Zr diffusion into the BaTiO 3 latt…
Abstract not Available.
We consider the effects of impurities on the velocity selection of a needle crystal, in the small thermal and solutal Peclet numbers. As in the case of the growth in a pure melt, steady solutions for needle crystals are found only if surface tension is anisotropic. When anisotropy is small, the variation of ${\ensurem…
Article The High Temperature Corrosion of Metals in Sulfidizing-Oxidizing Environments: A Critical Review was published on April 1, 1989 in the journal High Temperature Materials and Processes (volume 8, issue 3).
Liposomal gadolinium diethylenetriaminepentaacetic acid (DTPA) encapsulated within 70- and 400-nm vesicles was tested as a contrast agent for magnetic resonance (MR) imaging of the liver in rats with hepatic metastases. Liposomal Gd-DTPA caused significant improvement in contrast between liver and tumor (P less than .…
The design of a planar, thin-film, multijunction thermal converter (MJTC) on a silicon chip containing a window with a SiO/sub 2/ membrane for low heat conductance underneath the thermal element is described. This design offers the possibility of mass production of MJTCs. Typical relative AC-DC transfer uncertainties…
The photoelectrochemical behavior of electrochromic nickel hydroxide films in 1 M KOH is reported. Cathodic photocurrent was obtained from reduced films which behave as p‐type semiconductors. The effective bandgap of the reduced phase is estimated to be 3.6–3.9 eV, although optical absorbance and photoaction data indi…
The materials requirements for nonlinear-optical applications, including electro-optics, second-harmonic generation, and all-optical signal processing, are discussed. The status of organic materials is reviewed in light of these requirements, along with the needs for future research.
Synthese des homo- et copolymeres par voie cationique. Mise en evidence de deux transitions vitreuses dans les copolymeres
An interpretation of current‐time transients describing anodic oxide film growth on metals is presented. When the rate of oxide film growth is controlled by ion conduction under high electric field, the classical theory of Cabrera and Mott leads to shallow curvature in plots of vs. . Such data can be linearized by usi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanions derived from tungstosilicate, A-.beta.-SiW9O3410-: synthesis and crystallographic and tungsten-183 NMR characterization of Si2W18Zr3O71H311-, including its organic solvent soluble Bu4N+ saltRichard G. Finke, Brian Rapko, and T. J. R. WeakleyCite this: Inorg. Ch…
Localized corrosion of stainless steels (SSs) has often occurred in newsprint paper machines, despite the low chloride concentration in the process water. This is now known to be caused by thiosulfateions, which can cause pitting of AISI 304 steel without assistance from chloride if the sulfate-to-thiosulfate ratio is…