Materials Literature
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We have developed a technique to measure the frequency-dependent specific heat of a liquid over a frequency range exceeding five decades, 0.01–3000 Hz. The measurement is not performed adiabatically, but rather relies on heat diffusion from a thin, planar heater immersed in the liquid sample. The spectrometer has been…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochromism of polyaniline film prepared by electrochemical polymerizationAkira Watanabe, Kunio Mori, Yasunori Iwasaki, Yoshiro Nakamura, and Shigeya NiizumaCite this: Macromolecules 1987, 20, 8, 1793–1796Publication Date (Print):August 1, 1987Publication History Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence and photoisomerization of azobenzene-containing bilayer membranesMasatsugu Shimomura and Toyoki KunitakeCite this: J. Am. Chem. Soc. 1987, 109, 17, 5175–5183Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1…
Interface unbinding transitions, such as those arising in wetting phenomena, are studied in d dimensions with general interactions. Three scaling regimes must be distinguished: a mean-field (MF), a weak-fluctuation (WFL), and a strong-fluctuation (SFL) regime. A simple picture clarifies the origin and nature of the di…
Transmission electron microscopy was used to establish densification, alignment, and magnetization reversal mechanisms in hot-pressed and die-upset NdFeB magnets. Microstructures of these materials reveal two principal phases: Nd2Fe14B grains and a grain boundary phase of approximate composition Nd7Fe3. The grains in…
The cell surface topology of various gram-negative and -positive, anaerobic and aerobic, mesophilic and thermophilic, cellulolytic and noncellulolytic bacteria was investigated by scanning electron microscopic visualization using cationized ferritin. Characteristic protuberant structures were observed on cells of all…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new series of molecular semiconductors: phthalocyanine radicalsP. Turek, P. Petit, J. J. Andre, J. Simon, R. Even, B. Boudjema, G. Guillaud, and M. MaitrotCite this: J. Am. Chem. Soc. 1987, 109, 17, 5119–5122Publication Date (Print):August 1, 1987Publication History Publis…
Abstract The bulk polymerization of L , L ‐dilactide was studied as a function of polymerization temperature ( T p ), time and concentration of catalyst (tin 2‐ethylhexanoate). Poly( L ‐lactide) (PLLA), with the highest value of intrinsic viscosity ([η] = 13 dl · g −1 ; M̄ v ≈ 1 · 10 6 ) and heat of fusion (Δ H m = 64…
The chemically-synthesized emeraldine base form of polyaniline is soluble in aqueous acetic acid solutions, in which it presumably exists as the ‘doped’ emeraldine acetate salt. Films having a conductivity of ≈0.5 –2S/cm may be cast from the solutions. These films may be converted to relatively flexible, free-standing…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Etude de la densite electronique a temperature ambiante dans Ca(BO 2 ) 2 par diffraction RX sur deux cristaux. Ca(BO 2 ) 2 cristallise avec le groupe d'espace Pnca. Affinement de la structure jusqu'a R=0,016 (cristal I) et R=0,024 (cristal II)
Abstract Electro-oxidative polymerization of benzene in the presence of trifluoromethane sulfonic acid yields poly(p-phenylene) efficiently; The acid forms a protonated complex of benzene and cathodically shifts its oxidation potential.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe electrical properties of poly(5,6-dihydroxy-2-cyclohexen-1,4-ylene) derivativesD. R. McKean and J. K. StilleCite this: Macromolecules 1987, 20, 8, 1787–1792Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 198…
Native cellulose samples having a wide range of crystallinity and crystallite size were mercerized by treatment with sodium hydroxide. The resultant cellulose II samples showed only a narrow range of crystallinity and an essentially constant crystallite size. For the low-crystallinity samples, crystallinity and crysta…
Calculations of the growth and collapse of transient vapour cavities near a free surface when buoyancy forces may be important are made using the boundary-integral method described in Part 1. Bubble shapes, particle paths, pressure contours and centroid motion are used to illustrate the calculations. In the absence of…
In order to identify the mechanisms behind the adverse effect of oxygen contamination on the densification of TiB 2 ceramics, densification and grain growth behavior during pressureless sintering (1700° to 2050°C) were examined as a function of oxygen content of the powder and compared with those observed during hot‐p…
A paramagnetic-labeled macromolecule, albumin-(Gd-DTPA), was prepared for use as an intravascular contrast agent for magnetic resonance imaging. An average of 19 Gd-DTPA chelates were covalently conjugated to human serum albumin through the bifunctional anhydride of DTPA. The albumin-(Gd-DTPA) was characterized with u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Bond strengths in the second and third periodsMichael W. Schmidt, Phi N. Truong, and Mark S. GordonCite this: J. Am. Chem. Soc. 1987, 109, 17, 5217–5227Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987ht…
The control of isocitrate dehydrogenase through phosphorylation is necessary for growth of Escherichia coli on acetate as the sole carbon source. To understand the mechanism by which phosphorylation inactivates isocitrate dehydrogenase, the sequence of icd, the isocitrate dehydrogenase structural gene, was determined…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence properties of organometallic complexesAlistair J. LeesCite this: Chem. Rev. 1987, 87, 4, 711–743Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://pubs.acs.org/doi/10.1021/cr00080a003https:…