Materials Literature
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Monoclinic ZrO 2 has been milled for various times down to a crystallite size of 145 Å. Using the time‐differential perturbed‐angular‐correlation technique, it was possible to associate the resulting growing amount of disordered material with two different, very distributed and milling‐time‐dependent hyperfine interac…
A reflection grating with a binary surface profile is presented that has high diffraction efficiency. The measured intensity for the + 1st diffracted order was 77%. The binary grating is composed of a minilattice with feature sizes comparable with the wavelength of the incident light. The overall structure is designed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Characterization, and Properties of Covalently Bound, Self-Assembled Porphyrin Multilayer Thin FilmsDeQuan Li, C. Thomas Buscher, and Basil I. SwansonCite this: Chem. Mater. 1994, 6, 6, 803–810Publication Date (Print):June 1, 1994Publication History Published onli…
Abstract The close approach of the fluorine nuclei in the difluorinated syn ‐[3.3]metacyclophanes 1, 2 and their [2.2] analogues 3, 4 leads to strong 19 F, 19 F spin‐spin interactions which obey a through‐space mechanism. The geometries of 1–4 were estimated by MM2 molecular mechanics computations, those of 1 and 3 we…
ZnO solidus and liquidus boundaries in the ZnO‐Bi 2 O 3 system were investigated via analytical electron microscopy (AEM), electron probe microanalysis (EPMA), and secondary ion mass spectrometry (SIMS). The Bi 2 O 3 solubility is highest—0.24 ± 0.04 mol%—at the eutectic temperature of 740°C and decreases rapidly with…
Abstract A joint project of different european aircraft manufacturers involves the investigation of the involvement of microorganisms in corrosion damage in aircraft. In a first step, the microflora of corrosion failures was investigated. Swab samples were taken from corroded sites and were cultured on different media…
Lead titanate particles of controlled size around the nanometer range were prepared by hydrolyzing a mixture of the constituent metal alkoxides. The hydrolysate powder was crystallized by calcination into a tetragonally distorted perovskite structure. The hydrolysate started to crystallize by calcination at 470° C for…
The amount of IIAGlc, one of the proteins of the phosphoenolpyruvate:glucose phosphotransferase system (PTS), was modulated over a broad range with the help of inducible expression plasmids in Salmonella typhimurium. The in vivo effects of different levels of IIAGlc on glycerol and maltose metabolism were studied. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Organic Chemical Partition in Soils. 1. Development of a General Partition Model and Application to Linear IsothermsFrank C. Spurlock and James W. BiggarCite this: Environ. Sci. Technol. 1994, 28, 6, 989–995Publication Date (Print):June 1, 1994Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-Temperature Tunneling in the Spin-State Relaxation Dynamics of Iron(III) Spin-Crossover CompoundsSabine Schenker and Andreas HauserCite this: J. Am. Chem. Soc. 1994, 116, 12, 5497–5498Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Publ…
Abstract Competition between phase separation and transesterification in immiscible polymer blends of polycarbonate (PC) and a copolyester (PET) is studied as a function of time and temperature by differential scanning calorimetry (DSC) and small‐angle neutron scattering (SANS). We found that (1) Global structure coar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic study of the carboxymethylation of celluloseTapio Salmi, Daniel Valtakari, Erkki Paatero, Bjarne Holmbom, and Rainer SjoholmCite this: Ind. Eng. Chem. Res. 1994, 33, 6, 1454–1459Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Exchange Kinetics of Chemically Different PolymersJ. C. Dijt, M. A. Cohen Stuart, and G. J. FleerCite this: Macromolecules 1994, 27, 12, 3229–3237Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://p…
The dynamic mechanical and infrared spectroscopic investigation of ionomer blends of poly-(diacety1ene)-a nd polystyrene-based ionomers has shown that miscibility of this usually incompatible polymerpair can be achieved through ion-ion interactions between the blend components. Microphase separationis prevented throug…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvolution of Crystalline Structures of Poly(.epsilon.-caprolactone)/Polycarbonate Blends. 1. Isothermal Crystallization Kinetics As Probed by Synchrotron Small-Angle X-ray ScatteringY. Wilson Cheung, Richard S. Stein, Benjamin Chu, and Guangwei WuCite this: Macromolecules 19…
The enzyme CoA transferase (succinyl-CoA:3-ketoacid coenzyme A transferase [3-oxoacid CoA transferase], EC 2.8.3.5) is essential for the metabolism of ketone bodies in the mammalian mitochondrion. It is known that its catalytic mechanism involves the transient thioesterification of an active-site glutamate residue by…
Electrochemical Behavior of Polyaniline‐Poly(styrene sulfonate) Composite Films in Organic Electrolyte Solutions, Morita, Masayuki, Miyazaki, Seijiro, Tanoue, Hiroyuki, Ishikawa, Masashi, Matsuda, Yoshiharu
The crystal structure of kombatite, Pb,o(voo),o,clo, a : 12.682(2), b : 22.566(5), c : r r . 279 (2 ) A , B : l l s . l l ( l f , v : 2847 ( l ) [ t , 7 :4 , C2 /c , has been so l ved by d i rec t methods and refined to an R index of 9.00/o using MoKa X-ray data. There is one unique V position tetrahedrally coordinate…
High-quality sizable single crystals of the radical compound 2,4,6-triphenylverdazyl (TPV) have been prepared and their magnetic properties investigated by neutron-diffraction and magnetization measurements. Neutron-diffraction peaks corresponding to long-range antiferromagnetic ordering have been observed below the N…
A two-dimensional dynamics model for the motion of fibers in an accelerating laminar air flow is presented. Nonlinear model equations for each fiber include effects of inertia, air drag, and flexural rigidity. This rigidity, or stiffness, acts in such a way that a curled or hooked fiber resists being straightened. Ran…