Materials Literature
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The thermoelastic martensitic transformation in shape-memory alloys is studied thermodynamically. Calorimetric experiments on the Cu─Zn─A1 alloy system reveal that the transformation takes place with a practically negligible entropy production. The usual hysteretic subloop behaviour during partial cycling is obtained…
The sinterability of Al 2 O 3 /ZrO 2 composite powder compacts containing 2 and 10 vol% ZrO 2 was compared to the sinterability of their single‐phase constituents through constant‐heating‐rate experiments. The ZrO 2 inclusion phase delayed the initiation of bulk shrinkage and the temperature of maximum strain rate by…
Abstract The miscibility of polyester/nitrocellulose blends was investigated by differential scanning calorimetry and Fourier‐transform infrared (FTIR) spectroscopy. Two nitrocelluloses (NC) derived from wood and having different nitrogen contents (12.62 and 13.42%) were used. On the basis of the glass transition temp…
Abstract Surface‐enhanced Raman scattering (SERS) from p ‐aminobenzoic acid (PABA) adsorbed on silver island films was investigated. PABA reacted very quickly to form p , p′ ‐azodibenzoate when exposed to atmospheric moisture and laser light. This was evidenced by the appearance of a strong band near 1460 cm −1 and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThiolato dinitrogen (or hydrazido(4-)) complexes, [Ta(SAr)3(THF)]2(.mu.-N2) (Ar = 2,6-C6H3-iso-Pr2, 2,4,6-C6H2-iso-Pr3), and phenoxide analogs. A structural comparison of [Ta(S-2,6-C6H3-iso-Pr2)3(THF)]2(.mu.-N2), and [Ta(O-2,6-C6H3-iso-Pr2)3(THF)]2(.mu.-N2)R. R. Schrock, M.…
Abstract Yeast cells, Saccharomyces cerevisiae and carlsbergensis , have been analysed by XPS. A preparation and analysis procedure was developed in order to minimize contamination and re‐arrangements of the cell surface. The use of an external standard of silica permitted the absolute surface concentrations to be est…
Abstract Room‐temperature X‐band EPR data for Gd 3+ ‐doped isostructural rare‐earth trichloride hexahydrates are analyzed using a rigorous least‐squares‐fitting procedure. Discussion of the three forms of spin Hamiltonian corresponding to the orientations of the two‐fold monoclinic symmetry axis C 2 parallel to the ma…
How bridging can markedly change the reactivity of a compound is demonstrated by the tricyclo[4.2.0.02.5]octadiene derivative 1. Its thermal and photochemical behavior is completely different from that of the parent compound. Upon warming, 1 undergoes a degenerate Cope rearrangement and, upon irradiation, the fourfold…
The composition of anodic oxide films anodically formed on aluminum in phosphate solutions with different p H's was examined by chemical sectioning in a sulfuric acid solution combined with impedance measurements, solution analysis, and electron microscopy. The oxide films were found to consist of two layers: an outer…
Abstract Polyurethane (PU) cationomers have been synthesized by quaternizing tertiary amine‐containing linear polyurethanes using different quaternizers containing acid groups. The effect of chemical structure of PU cationomers on the physical properties was studied. The mechanical properties of PU cationomers were im…
A gene encoding glucose dehydrogenase of Bacillus megaterium M1286 was isolated from a lambda-EMBL3 phage library. It is transcribed and translated in cells of the heterologous organism Escherichia coli by own control regions. The gene is located on a 1126-bp HindIII fragment. Its nucleotide sequence contains 220 bp i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR study of the conformations of free and lanthanide-complexed glutathione in aqueous solutionBenjamin. Podanyi and R. Stephen. ReidCite this: J. Am. Chem. Soc. 1988, 110, 12, 3805–3810Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Publis…
This investigation is concerned with the effect of thiophene monomer structures on the electrochemical behavior and physical characteristics of electropolymerized poly(thiophenes) and various poly(3‐methylthiophenes). These variations in polymer structure were achieved by employing thiophene and 3‐methylthiophene olig…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic ring-opening polymerization of sila- and germacyclopent-3-enesXuehai Zhang, Qingshan Zhou, William P. Weber, Raymond F. Horvath, T. H. Chan, and Georges ManuelCite this: Macromolecules 1988, 21, 6, 1563–1566Publication Date (Print):June 1, 1988Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUV-visible and carbon NMR studies of chloroquine binding to urohemin I chloride and uroporphyrin I in aqueous solutionsI. Constantinidis and James D. SatterleeCite this: J. Am. Chem. Soc. 1988, 110, 13, 4391–4395Publication Date (Print):June 1, 1988Publication History Publis…
The magnetic susceptibilities of a large number of ternary oxides of copper having structural features common to the presently identified phases of high-temperature superconductors have been studied in the temperature range 14-300 K. The systems studied are Ln2CuOP( Ln = La, Pr, Nd, etc.), Sr2CuO2CI2,B i2Cu0,, Ca2Cu03…
The density of dependence of the static structure factor S(Q) of liquid-like ordered colloidal suspensions is investigated by light scattering techniques. We found that variation of the particle number density even by a factor of 8 produced only a modest change of the height of the first peak of S(Q). In order to obta…
High‐purity mullite‐SiC‐whisker composites and mullite‐ZrO 2 ‐SiC‐whisker composites were fabricated in situ by hot‐pressing using a matrix prepared by the alkoxide process. Varying degrees of ZrO 2 stabilization were achieved by varying amounts of Y 2 O 3 or MgO addition. Microstructural characterization was accompli…
Abstract Poly(β‐hydroxyalkanoates) are nature's high molecular weight thermoplastic polyesters. They occur as storage granules in a variety of bacteria. From a plastics, film, and fibres perspective, the statistically random copolyesters based on β‐hydroxybutyrate (HB) and β‐hydroxyvalerate (HV) repeating units have h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence for activation of the carbon-oxygen bond of methanol on the palladium(111) surface after low temperature adsorptionRobert J. Levis, Jiang. Zhicheng, and Nicholas. WinogradCite this: J. Am. Chem. Soc. 1988, 110, 13, 4431–4432Publication Date (Print):June 1, 1988Publi…