Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of the 1,4 biradical in the Paterno-Buchi reactionSteven C. Freilich and Kevin S. PetersCite this: J. Am. Chem. Soc. 1981, 103, 20, 6255–6257Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published inissue 1 October 1981http…
Abstract Polyether polyurethanes based on 4,4′‐diphenylmethane diisocyanate (MDI), N‐methyl diethanolamine (MDEA), and polytetraniethylene oxide (PTMO) were synthesized with varying levels of hard segment content. The tertiary amine of MDEA was sulfonated with γ‐propane sultone thereby converting the polyether polyure…
The reflection coefficients for light, polarized parallel and perpendicular to the plane of incidence, incident on a translationally invariant jellium surface are derived. The derivation is based on a form of pillbox integration of the two Maxwell equations which normally give the continuity of the parallel field comp…
The strengths of bonds formed between transition metals and \nvarious substituent groups are of fundamental importance in the areas of surface chemistry, organometallic chemistry, and catalysis. The scarcity of such thermodynamic information has led us to develop new experimental methods for the determination of t…
Diamondlike carbon films produced both by ion-beam technique and by radio-frequency (rf) plasma decomposition of hydrocarbon gases (C4H10, C2H6, C3H8, and CH4) have been examined using the technique of transmission electron microscopy. Although these examinations indicate that these films are predominantly amorphous,…
The dyadic Green's function, relating currents and fields in transverse-k space, is determined for a homogeneous magnetoplasma, and then extended to a plane- stratified system by means of the reflexion and transmission matrices of the medium, taking into account multiple reflexions at the source and observation points…
An analysis of the bulk reaction to alternating field (AF) demagnetization of an assemblage of intrinsically anisotropic grains is performed in order to determine the difference between tumbling and 3-axis AF demagnetization of an isothermal remanent magnetization (IRM). TWO models are used to describe the anisotropic…
A nonlocal continuum theory of liquid crystals is constructed to explain and predict the physical behavior of liquid crystals under long range intermolecular forces Balance laws consist of conservation of mass and mocroinertia, balance of momenta and energy. Constitutive equations are given for the equibilibirium and…
The hysteresis loop, described during the formation of stressinduced pseudoelastic martensite in a Cu-Zn-Al betaphase single crystal, was studied as a function of strain-rate, deformation amplitude and temperature. The σp→m, the stress at which the transformation starts at a given constant temperature, is strain-rate…
Abstract The optical properties of the noble metal copper are determined by computer fitting the experimentally obtained attenuated total internal reflection (ATR) spectra of its surface plasmon in the visible spectral region (0.42 to 0.63 μm). The dispersion curves of the surface plasmon resonance of copper are deter…
Ionic conductivities σ i of silver chalcogenides have been measured as functions of the temperature and the carrier concentration n i . It has been found that σ i is larger in bcc than in fcc by about 20% at the phase transition fce\( \rightleftarrows \)bcc, and ∂σ i /∂( e n i ) is several times larger than the mean m…
Abstract 13C chemical shifts of solid chitin and N-acyl chitosans were measured by cross polarization/magic angle spinning (CP/MAS) NMR spectroscopy. It was found that a regenerated chitin, N-acetyl chitosan, adopts conformation almost identical to that of naturally occurring chitin in solid state. Conformation of N-d…
A comprehensive collection of spin-echo NMR spectra from nuclei of both host and transition-metal impurities ($T$) in pseudobinary ${\mathrm{Fe}}_{3\ensuremath{-}x}{T}_{x}\mathrm{Si}$ alloys taken at about 1.3 K are presented and analyzed. We summarize some new data on $3d$ elements and also review briefly some result…
Electron-diffraction investigation of single crystals of γ-poly (vinylidene fluoride) grown from the melt has revealed streaking of 0k0 reflections. The three-dimensional structure of the spikes was studied by specimen tilting during electron diffraction; streaking is maximized in the b*c* view and disappears in the a…
The oxidation states of Mn in Mn-doped BaTiO3 were investigated by ESR, supplemented by thermal analysis and electrical conductivity data. Direct evidence for the presence of Mn2+ and Mn4+ and indirect evidence for the presence of Mn3+ is presented. Based on the Jahn-Teller distortion characteristics of the various ox…
The nematic-isotropic transition temperature was measured by means of an optical technique as a function of applied magnetic field for the material octyl-cyanobiphenyl. The results represent the first unambiguous demonstration of the magnetic field term in the thermodynamic equation for a liquid-crystal phase transiti…
A very general sufficient condition for the onset of "thermodynamic" instability at a turning point is proved, assuming essentially nothing beyond the smoothness of the equilibrium-sequence in question.
Abstract The identification and quantification of the water associated with powdered clinoptilolite and clinoptilolite-bearing tuffs were made using thermogravimetric, vacuum gravimetric, and differential scanning calorimetric techniques. Inflection points on thermogravimetric curves at approximately 80° and 170°C cor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMinimum fluidization velocity at high temperaturesRanga R. Pattipati and C. Y. WenCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 4, 705–707Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published inissue 1 October 1981https://pu…
Abstract Nitinol has been reported to be more susceptible to electrolytic dissolution than stainless steel. This study compares corrosion of the two metals under clinical conditions and finds no significant difference.