Materials Literature
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Proteins, like DNA, are subject to various forms of damage that can render them non-functional. Conformational changes and covalent chemical alterations occur spontaneously, and the rates of these reactions can be increased by environmental stresses such as heat, oxidative agents, or changes in pH or osmotic condition…
It is demonstrated that electroluminescent porous silicon (PS) diodes operate as surface-emitting cold cathodes. The PS diode is composed of a semitransparent thin Au film, PS layer, n-type Si substrate and ohmic contact. When a sufficient positive bias voltage is applied to the Au contact in vacuum, the diode uniform…
We report on the synthesis and optical characterization of hydrazone derivatives developed for second-order nonlinear optics. Electric-field-induced second harmonic generation (EFISH) as well as semiempirical quantum-chemical computations have been carried out to investigate and explain the nonlinear optical propertie…
Abstract Isotherms were obtained for nitrogen adsorption and desorption on seven halloysite-rich samples from New Zealand and Western Australia. Calculations from these isotherms indicate that halloysites with mainly small particles (< c . 0.08 μm in width) had abundant cylindrical pores with narrow size distributi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect Observation of Three-Dimensional Bicontinuous Structure Developed via Spinodal DecompositionHiroshi Jinnai, Yukihiro Nishikawa, Tsuyoshi Koga, and Takeji HashimotoCite this: Macromolecules 1995, 28, 13, 4782–4784Publication Date (Print):June 1, 1995Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvolution of Microstructure during Shear Alignment in a Polystyrene-Polyisoprene Lamellar Diblock CopolymerV. K. Gupta, R. Krishnamoorti, J. A. Kornfield, and S. D. SmithCite this: Macromolecules 1995, 28, 13, 4464–4474Publication Date (Print):June 1, 1995Publication History…
Fractals have been used extensively to provide a description and to model mathematically many of the naturally occurring sampler shapes, such as coastlines, mountain ranges, clouds, etc., and have also received increased attention in the field of image processing, for purposes of segmentation and recognition of region…
ABSTRACT: Poly[4-[2-(methacryloyloxy)ethyllazobenzenel (pMEA) has been synthesized and its revers-ible optical storage properties tested in comparison with previously reported electron-donor-electron-acceptor substituted azobenzene-containing polymers. The cis-trans thermal isomerization rate is fairly slow in pMEA, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcylperoxo-Iron(III) Porphyrin Complexes: A New Entry of Potent Oxidants for the Alkene EpoxidationKenji Machii, Yoshihito Watanabe, and Isao MorishimaCite this: J. Am. Chem. Soc. 1995, 117, 25, 6691–6697Publication Date (Print):June 1, 1995Publication History Published onli…
Abstract Continuous kinetics of thermal degradation of poly (styrene‐allyl alcohol) (PSA) in solution are explored theoretically and experimentally. Thermal degradation experiments for PSA of number‐average molecular weight 1,640 in t‐butanol solution were conducted in a steady‐state flow reactor at 6.8 MPa and 403–47…
The dielectric spectrum of the antiferroelectric smectic C∗ phase exhibits a low and a high frequency absorption peak (Pl, Ph) which have been studied as a function of temperature and bias electric field. Measurements from 10 Hz to 10 MHz were carried out with smectic layers parallel and quasi-perpendicular to the cel…
Other| June 01, 1995 Al K-edge XANES spectra of aluminosilicate minerals Dien Li; Dien Li University of Western Ontario, Department of Chemistry, London, ON, Canada Search for other works by this author on: GSW Google Scholar G. M. Bancroft; G. M. Bancroft Search for other works by this author on: GSW Google Scholar M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanide and Actinide Contractions: Relativistic and Shell Structure EffectsMichael Seth, Michael Dolg, Peter Fulde, and Peter SchwerdtfegerCite this: J. Am. Chem. Soc. 1995, 117, 24, 6597–6598Publication Date (Print):June 1, 1995Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly Enantioselective Epoxidation of 1,1-Disubstituted Alkenes Catalyzed by ChloroperoxidaseAnnette F. Dexter, Frederick J. Lakner, Robert A. Campbell, and Lowell P. HagerCite this: J. Am. Chem. Soc. 1995, 117, 23, 6412–6413Publication Date (Print):June 1, 1995Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear Orientation and Rheology of a Lamellar Polystyrene-Polyisoprene Block CopolymerS. S. Patel, R. G. Larson, K. I. Winey, and H. WatanabeCite this: Macromolecules 1995, 28, 12, 4313–4318Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Pub…
Abstract Glycidol (2‐epoxy‐1‐propanol) was polymerized under the action of Lewis acids (BF 3 OEt 2, , SnCl 4 ) and protonic acids (CF 3 COOH, CF 3 SO 3 H). Polymers with number‐average molecular weights ( M̄ n ) varying from 2500 to 6000 g/mol were obtained. The structure of obtained polymers was characterized by 13 C…
Abstract Material surfaces that can mediate cellular interactions by the coupling of specific cell membrane receptors may allow for the design of a biomaterial that can control cell attachment, differentiation, and tissue organization. Cell adhesion proteins have been shown to contain minimum oligopeptide sequences th…
In agreement with the experimental results of the groups of Rassat and Iwamura on respectively m-phenylene\nbis(tert-butyl nitroxides) 2 and 3, ab initio calculations on m-benzoquinodimethane (la) and m-phenylene bis(nitroxide)\n(la) find that near dihedral angles of 4 = 90" between the benzene ring and the radical-be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCationic Aluminum Compounds with Potential Relevance to Lewis Acid CatalysisDavid A. Atwood, Jolin A. Jegier, and Drew RutherfordCite this: J. Am. Chem. Soc. 1995, 117, 25, 6779–6780Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published…
This paper reviews our current work on the synthesis of new organic-soluble aromatic polyamides and polyimides having high glass transition temperatures above 300 °C. Our strategy to achieve this goal is to introduce a bulky pendant phenyl group along the polymer backbone and to incorporate a crank and twisted non-cop…