Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural consequences of porphyrin tautomerization. Molecular structure of a zinc isoporphyrinK. M. Barkigia, M. W. Renner, H. Xie, K. M. Smith, and J. FajerCite this: J. Am. Chem. Soc. 1993, 115, 17, 7894–7895Publication Date (Print):August 1, 1993Publication History Publ…
X-ray θ scans and high-resolution transmission electron microscopy (HRTEM) imaging indicate that the calcite of sea urchin spines and skeletal plates forms in mosaic crystals. Both coherent and incoherent boundaries were observed between slightly misaligned crystallites. Small domains show an ordered superstructure. U…
The arsenic pressure dependence of surface diffusion of Ga adatoms in molecular beam epitaxy (MBE) on (111)B-(001) mesa-etched substrates was investigated by means of in situ scanning microprobe reflection high-energy electron diffraction (µ-RHEED). It was observed for the first time that the direction of Ga adatom mi…
Abstract The mechanism of intumescence is studied in mixtures of ammonium polyphosphate (APP) with several polycondensates as a part of a systematic study of intumescent fire retardants. It is shown that APP reacts on heating with the polycondensate to form a precursor of the intumescent char which is obtained on furt…
Photodynamic therapy (PDT) of cancer is a modality that relies upon the irradiation of tumors with visible light following selective uptake of a photosensitizer by the tumor tissue. There is considerable emphasis to define new photosensitizers suitable for PDT of cancer. In this study we evaluated six phthalocyanines…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIs hole transfer involved in metalloporphyrin-catalyzed epoxidation?Taisun Kim, Gholam A. Mirafzal, Jianping Liu, and Nathan L. BauldCite this: J. Am. Chem. Soc. 1993, 115, 17, 7653–7664Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence studies of diaminodiphenyl sulfone curing agent for epoxy cure characterizationJian Cheng Song and Chong Sook Paik SungCite this: Macromolecules 1993, 26, 18, 4818–4824Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of structure and annealing on the surface composition of multiblock copolymers of bisphenol A polycarbonate and poly(dimethylsiloxane)Xin Chen, Helen F. Lee, and Joseph A. Gardella Jr.Cite this: Macromolecules 1993, 26, 17, 4601–4605Publication Date (Print):August 1,…
Abstract This paper presents an improved self‐consistent method for estimating the permeability of an aligned fiber assembly, in both longitudinal and transverse directions. In this method an insertion is assumed to include open space surrounded by densely packed fibers. This improvement allows us to describe effectiv…
Results from numerous in-reactor experiments with uranium dioxide fuel elements that contain defects in the Zircaloy cladding are reviewed. The various factors that influence the rate of physical deterioration of a defected element are examined. Experimental and theoretical investigations into the release behavior of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of one-electron oxidation of NAD(P)H and function of NADPH bound to catalaseOrn Almarsson, Ashoke Sinha, Enona Gopinath, and Thomas C. BruiceCite this: J. Am. Chem. Soc. 1993, 115, 16, 7093–7102Publication Date (Print):August 1, 1993Publication History Published on…
Low density polyethylene (PE) and polyethylene terephthalate (PET) films were treated in air plasma of a low pressure (500 mTorr) large area microwave (2.45 GHz) discharge, or in a corona discharge at atmospheric pressure. The modified surfaces were characterized by X-ray photoelectron spectroscopy (XPS) for their oxy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRing-opening copolymerization of optically active .beta.-butyrolactone with several lactones catalyzed by distannoxane complexes: synthesis of new biodegradable polyestersYoji Hori, Yoko Takahashi, Akio Yamaguchi, and Takao NishishitaCite this: Macromolecules 1993, 26, 16, 4388–…
Activated carbon fiber was used as a new adsorbent for direct removal of iodine and iodide compounds from acetic acid solutions under static and dynamic conditions. In aqueous solution as well as in acetic acid, methanol, or ethanol, activated carbon fiber showed excellent iodine removal efficiency, superior to that o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic mechanical relaxation and x-ray scattering study of poly(butylene terephthalate)/polyarylate blendsPeter P. Huo, Peggy Cebe, and Malcolm CapelCite this: Macromolecules 1993, 26, 16, 4275–4282Publication Date (Print):August 1, 1993Publication History Published online1…
We study the nonequilibrium dynamic fluctuations of a polymer subject to an external force, moving in a dilute solution at a uniform average velocity. Starting from general symmetry arguments, a set of nonlinear equations is proposed to describe the time evolution of the polymer. The dynamic scaling of fluctuations is…
Abstract The title compound (1a) and its related unsymmetrical derivatives were prepared as new donors for organic conductors, and electrochemical properties and crystal structure of 1a were investigated. Several charge-transfer complexes and cation radical salts using them showed metallic temperature dependence of co…
The purpose of this paper is to review known art in the area of thermally controlled covalent linkage formation for use in thermally reversible polymer systems. Only 1 :1 adduct forming reactions are considered in this paper; e.g., condensation reactions are not discussed because these reactions are controlled via the…
Morphological stability analysis for the photoelectrochemical etching of n‐type Si is performed, in which the stability of the back‐illuminated Si‐electrolyte interface is theoretically investigated. Both the transport of holes in the semiconductor and ions in the diffusion layer are considered, together with the elec…
This investigation explores direct methanol fuel cells incorporating perovskite anode electrocatalysts. Preliminary electrochemical performance was addressed following incorporation of electrocatalysts into polymer electrolyte (Nafion 417) fuel cells. Perovskite electrocatalysts demonstrating activity towards direct m…