Materials Literature
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Two mechanisms are proposed for the limitation of strength in transformation‐toughened zirconia ceramics: that the strength is limited by the critical stress to induce the tetragonal‐to‐monoclinic zirconia phase transformation and that the inherent R ‐curve behavior of these materials limits the strength. Experimental…
Abstract The specific lamellar branching characteristic of isotactic polypropylene (iPP) in its α monoclinic modification, first investigated in detail by Khoury, is analyzed in molecular terms on the basis of the geometrical and structural models of Padden and Keith and of Binsbergen and de Lange, respectively. As su…
A theoretical study is made of the effect of the presence of a surfactant on the dynamics involved in the movement of the contact line when one liquid displaces an immiscible second liquid where both are in contact with a smooth solid surface. The general procedure of solution is described for a general model for slip…
To determine whether the surface free energy of polymer materials influences the spreading of 13 polymers and glass were related to spreading and growth of human skin fibroblasts. Experiments were performed in both the presence and absence of serum proteins. We calculated the surface free energy from contact angles of…
Abstract Electrical conductivity is important in many rubber and plastic compounds including antistatic applications, wire and cable sheathing, and shielding against electromagnetic interference (EMI). Elastomers and plastics are insulators (dielectrics) to which conductivity is imparted by addition of a finely divide…
This work reviews and discusses the data on the various thermodynamic properties of iron and silicon available through March 1984. These include heat capacity, enthalpy, enthalpies of transition and melting, vapor pressure, and enthalpy of vaporization. The recommended values for heat capacity, enthalpy, entropy, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transition and melting behavior of poly(oxy-1,4-phenyleneoxy-1,4-phenylenecarbonyl-1,4-phenylene) (PEEK)Stephen Z. D. Cheng, M. Y. Cao, and Bernhard WunderlichCite this: Macromolecules 1986, 19, 7, 1868–1876Publication Date (Print):July 1, 1986Publication History Publi…
The gene (fdhF) coding for the selenopolypeptide of the benzylviologen-linked formate dehydrogenase of Escherichia coli was cloned and its nucleotide sequence was determined. The fdhF gene contains, within an open reading frame coding for a protein of 715 amino acids (calculated molecular weight, 79,087), an opal (UGA…
The uniaxial tensile deformation behavior of 3 molpercent Y/sub 2/O/sub 3/-tetragonal ZrO/sub 2/ polycrystals was studied at temperatures up to 1500 C in ambient atmosphere. The tensile specimens which were elongated at constant displacement rates from 0.00011/s to 0.00055/s at 1450 C exhibited unusually large deforma…
The radial dynamics of a spherical bubble in a compressible liquid is studied by means of a simplified singular-perturbation method to first order in the bubble-wall Mach number. It is shown that, at this order, a one-parameter family of approximate equations for the bubble radius exists, which includes those previous…
An investigation is made into the dynamics involved in the movement of the contact line when one liquid displaces an immiscible second liquid where both are in contact with a smooth solid surface. In order to remove the stress singularity at the contact line, it has been postulated that slip between the liquid and the…
L. Hoffmann, Cyanophycées aériennes et subaériennes du Grand-Duché de Luxembourg, Bulletin du Jardin botanique National de Belgique / Bulletin van de Nationale Plantentuin van België, Vol. 56, No. 1/2 (Jun. 30, 1986), pp. 77-127
100-μm silicon-on-insulator structures have been achieved by first utilizing silicon molecular beam epitaxial (Si MBE) growth on porous silicon and subsequently oxidizing the porous silicon through the patterned Si MBE film windows. A Si beam method is used for the low-temperature surface cleaning of porous silicon pr…
This review deals with applications of glassy chalcogenide semiconductors in fiber and integrated optics. The physicochemical properties of chalcogenide glasses are discussed in detail. It is shown that they are promising materials for fiber-optic communication lines operating in the near infrared and particularly in…
We present a new theory of dynamic correlations for a classical one-component plasma in strong Coulomb coupling within the generalized viscoelastic formalism. The dynamic structure factor and the coefficient of shear viscosity for the one-component plasma in a metastable supercooled state are investigated and the poss…
Colloidal aggregation and other random growth processes produce structures that behave differently from ordinary bulk matter. Much of this behavior can be described in terms of the invariance of the aggregates under changes of spatial length scale: they appear to be fractals. There are two types of basic mechanisms fo…
Rectifying p-n junctions have been formed between n-type Ge20Bi11Se69 bulk glass and p-type chalcogenide films such as Ge20Se80 and As2Se3. The forward current in the power law increased with increasing bias voltage, suggesting that it was space charge limited. The spectral response of the short circuit currents showe…
The crystallinity and luminescent property were studied on evaporated CaS:Eu thin films. The orientation of the film strongly depends on substrate temperature. Distinct orientation was not observed in films deposited below 600 °C. Above 600 °C, the films tend to have a (111) orientation. The red emitting electrolumine…
We report measurements of the melting velocity of amorphous Si relative to that of (100) crystalline Si. These measurements permit the first severe experimental test of theories describing highly nonequilibrium freezing and melting. The results indicate that freezing in Si is inherently slower than melting; this asymm…
A new lattice model of polymer crystallization is described. Results of numerical solutions of rate equations for crystallization of a two-dimensional "crystal" are presented. It is shown that the crystal thickness varies inversely with supercooling and that kinetics similar to secondary nucleation occurs. This is tru…