Materials Literature
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Poly(L-lysine) was reacted with spiropyran reagents to give polypeptides containing 46 and 25 mol % spiropyran units in the side chains. The resulting modified polymers were soluble in hexafluoro-2-propanol (HFP), where they exhibited reverse photochromism. In pure HFP, the photochromic polymers were random coils and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFull Multiple Scattering and Crystal Field Multiplet Calculations Performed on the Spin Transition FeII(phen)2(NCS)2 Complex at the Iron K and L2,3 X-ray Absorption EdgesV. Briois, Ch. Cartier dit Moulin, Ph. Sainctavit, Ch. Brouder, and A.-M. FlankCite this: J. Am. Chem. So…
Abstract Comparison of oxygen and nitrous oxide indices indicates that ammonium polyphosphate (APP) should act in the condensed phase when added to nylon 6 (PA‐6). A detailed study of the thermal degradation mechanism of PA‐6/APP mixtures is carried out. A polyphosphate ester is formed on heating, which is the precurs…
Abstract The isoconversional method was used to elucidate the kinetics of reversible solid‐state reactions occurring under nonisothermal linear heating. The characteristic dependencies of the effective activation energy (E) on the extent of conversion (W) were established for two model processes: a reversible first‐or…
The solution conformation of methyl alpha-lactoside has been studied through nmr spectroscopy and molecular mechanics calculations using the assisted model building with energy refinement (AMBER) force field. The nmr data have included nuclear Overhauser effect (NOE) measurements both in the laboratory and rotating fr…
A variational approach based on the Gibbs-Bogoliubov inequality is used in order to evaluate the free energy of simple fluids described by a double-Yukawa pair potential. A hard-sphere reference fluid is used to describe the fluid phases, and an Einstein reference crystal to describe the solid phases. Apart from the u…
During the past 5 years, important advances have been accomplished in the understanding of the fate of aliphatic polyesters derived from lactic acid (LA) and glycolic acid (GA) in aqueous media. Hydrolysis of solid LA/GA polymers is now regarded as dependent upon a diffusion-reaction mechanism. Faster central degradat…
Silicon-based, light-emitting devices (LED's) should find numerous uses in optoelectronics. For example, the integration of silicon LED's with silicon microelectronics could lead to reliable and inexpensive optical displays and optical interconnects. Until recently, however, it had not been possible to obtain efficien…
The production of polyhydroxybutyrate (PHB) by Alcaligenes eutrophus DSM 545 was studied in a synthetic medium with 3% glucose at pH 7.0 supplemented with several ammonium substrates and cane molasses. Growth was measured by dry cell weight, and the PHB content was measured by gas chromatography. The effects of ammoni…
Aging and life models based on growth of electrical trees in insulating materials and systems subjected to electrical stress are investigated. The models consider aging to be primarily a function of either the tree length or the intensity of discharges occurring within the trees. In terms of the latter quantity, a mod…
The glass structure and physical properties are reported for the nonconventional binary bismuth cuprate glasses of compositions (CuO${)}_{\mathit{x}}$(${\mathrm{Bi}}_{2}$${\mathrm{O}}_{3}$${)}_{100\mathrm{\ensuremath{-}}\mathit{x}}$, for x=27--70 mol %, prepared by the roller-quenching technique. It has been observed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOriented Immobilization of Fab' Fragments on Silica SurfacesBin. Lu, Jiamin. Xie, Chunlin. Lu, Changru. Wu, and Yu. WeiCite this: Anal. Chem. 1995, 67, 1, 83–87Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1…
[Mixed-metal oxide]/[Nafion] hybrid films were formulated via in situ sol-gel reactions for tetrabutyl titanate/tetraethoxysilane and for aluminum tri-sec-butoxide/tetraethoxysilane alkoxide pairs. Inorganic composition profiles across film thicknesses were investigated via X-ray energy dispersive spectroscopy with an…
Perovskite-related compounds in the series A2FeMO6(A Ca, Sr, Ba; M Nb, Ta, Sb) have been prepared using the standard techniques of solid state chemistry and characterized by X-ray powder diffraction, magnetometry and Mössbauer spectroscopy. All but the 6H hexagonal compound Ba2FeSbO6 adopt cubic or pseudo-cubic crysta…
Abstract Limited information has been published on Andisols in Iceland, but such data are important for understanding the erosional and periglacial processes that are intense in Iceland. The objectives of this research were to investigate Andisols that developed in tephra and eolian materials and that are highly susce…
Composites and Blends: Composite Applications in Commercial Transport Aircraft J.T. Quinlivan, H.R. Fenbert. High Performance Materials: Improved Mechanical Properties of Polymer Films Dried from the Swollen State in Uniaxial and Biaxial States of Strain J.E. Mark. Materials for Electronics: Optic Characterization of…
We consider the behaviour of liquid droplets at the liquid/vapour interface. We discuss the feasibility of drop entry into the interface in terms of the various interfacial tension in equilibrated systems, noting the thermodynamic constraints on equilibrium tensions; we also note the important possibility of the forma…
Metallothionein is a cysteine-rich metal-binding protein whose biosynthesis is closely regulated by the level of exposure of an organism to zinc, copper, cadmium, and other metal salts. The metallothionein from Callinectes sapidus is known to bind six divalent metal ions in two separate metal-binding clusters. Heteron…
Metals can exhibit dendritic short-circuits caused by electrochemical migration in conductor-insulator structures, which may result in failures and reliability problems in microcircuits. The classical model of electrochemical migration has been well known for several decades. This process is a transport of metal ions…
The forms of polyaniline, viz. pernigraniline, emeraldine and leucoemeraldine, their mutual transformations and their roles in the chemical polymerization of aniline, are discussed. Absorption spectra of its various protonated forms and corresponding bases are reported. A simple reaction scheme is proposed to account…