Materials Literature
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Structural relaxation in a temperature range from 32 to 62° K glass transition has been investigated, for the first time, for a nearly monodisperse polystyrene using a differential scanning calorimeter and a thermal mechanical analyzer. Low temperature anneals in the vicinity of 320 K stabilize the glassy structure an…
Abstract— Kinetic studies of the hematoporphyrin–sensitized photooxidation of l ‐tryptophan and tryptamine at pH 10 in either homogeneous aqueous solutions or in aqueous dispersions of Triton X–100 and cetyltrimethylammonium bromide micelles indicate that the indole substrates are attacked via a mixed type I (electron…
Abstract In low strain fatigue, cracks often form in persistent slip bands (PSB) in a wide variety of materials. Observations of crack nucleation involving PSB have been made in copper single crystals by careful interferometric studies. The width, length, step height and thus strain localization in the PSBs remain ver…
A comparison of the corrosion and hydrogen uptake resistance of pickled, anodized, and thermally oxidized titanium is made. In general, thermal oxidation appears to offer better protection than the anodized or the pickled condition, thus, offering improved performance in heat exchanger applications as compared to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.alpha.-Silyl aldehydes: preparation and use as stereoselective vinyl cation equivalentsPaul F. Hudrlik and Ashok K. KulkarniCite this: J. Am. Chem. Soc. 1981, 103, 20, 6251–6253Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published i…
Abstract Polyurethanes were synthesized by reaction of a rigid molecule, 3,3′‐dimethyl‐4,4′‐biphenyldiyl diisocyanate (DBD), with flexible molecules, oligoethylene glycols (di‐, tri‐, and tetraethylene glycol) or α,ω‐alkanediols, and some of their thermal properties were studied. Poly(DBD‐oligoethylene glycol)s are am…
Considerable research and development work on the behavior of steam generator tubing materials has been performed during the last ten years. These studies relate mainly to such austenitic alloys as 18-10 stainless steels, Alloys 800, 600, or 690, sometimes with different heat treatments or surface finish. From these s…
We present here the phase diagram of a binary system of dipolar molecules in which five distinct smectic-$A$ regions are put in evidence both by calorimetric and x-ray investigations, four of these smectic-$A$ areas are contiguous and thus several ${S}_{A}\ensuremath{-}{S}_{A}$ transition lines and two triple ${S}_{A}…
When S. pombe is cultured in a medium containing a high concentration of CdCl2 (1 mM), it grows for over 20 h accumulating Cd2+ in the cells. Simultaneously, Cd-binding peptides (Cd-BP1 and -BP2) are synthesized, and accumulated depending on the time after addition of Cd2+ to the culture medium. Apparent molecular wei…
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…