Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Polymer chains adsorbed on rough impenetrable surfaces have been investigated analytically and by simulations. The cases of physical and chemical roughness of surfaces are identified and their distinctive effects on the adsorption characteristics are studied. For the chemically rough surface the adsorption temperature…
ABSTRACT The apparent permeability constants for potassium sorbate and sorbic acid through an edible film composed of methylcellulose and palmitic acid (weight ratio 3:1) were evaluated as a function of water activity (a w ) and pH. For films with thickness 55–66 μm, potassium sorbate permeability increased from 2.3 ×…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModulation of valence orbital levels of metalloporphyrins by .beta.-substitution: evidence from spectroscopic and electrochemical studies of 2-substituted metallo-5,10,15,20-tetraphenylporphyrinsRobert A. Binstead, Maxwell J. Crossley, and Noel S. HushCite this: Inorg. Chem.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic and kinetic studies of lanthanide complexes of 1,4,7,10,13-pentaazacyclopentadecane-N,N',N'',N''',N''''-pentaacetic acid and 1,4,7,10,13,16-hexaazacyclooctadecane-N,N',N'',N''',N'''',N'''''-hexaacetic acidMutsuo Kodama, Tohru Koike, Anung Budhi Mahatma, and Eii…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStable polyradicals with high-spin ground states. 1. Synthesis, separation, and magnetic characterization of the stereoisomers of 2,4,5,6-tetrachloro-.alpha.,.alpha.,.alpha.',.alpha.'-tetrakis(pentachlorophenyl)-m-xylylene biradicalJaume Veciana, Concepcio Rovira, Maria I. C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHost-guest complexation. 55. Guest capture during shell closureJudi A. Bryant, Michael T. Blanda, Marco Vincenti, and Donald J. CramCite this: J. Am. Chem. Soc. 1991, 113, 6, 2167–2172Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Publish…
The assembly of type I collagen molecules into native fibrils can be accomplished in vitro in solutions at physiological ionic strength and pH by raising the temperature above 30 degrees C. The thermal self-assembly reaction exhibits a distinct lag phase. This lag phase has been proposed to be evidence for a conformat…
We propose a model embedded-atom (many-body) potential and test it against an effective, density-independent, pairwise-additive potential in a variety of nonequilibrium molecular-dynamics simulations of plastic deformation under high stress. Even though both kinds of interactions have nearly the same equilibrium equat…
Abstract We hypothesize that the decomposition of organic debris derived from plants, planktonic animals, and algae by sulfate-reducing bacteria, and specifically by the enzymatic degradation of protein, is vital to organogenic dolomitization. The role of this degradation is to increase both alkalinity and pH of the p…
We developed engineering models that predict forces and penetration depth for long, rigid rods with spherical noses and rate-independent, strain-hardening targets. The spherical cavity expansion approximation simplified the target analysis, so we obtained closed-form penetration equations that showed the geometric and…
Three techniques were evaluated as soil P tests for western Canadian soils: anion‐exchange membrane (AEM), water, and bicarbonate extraction. The AEM, water, and bicarbonate‐extractable total P represented novel approaches to compare to the widely used bicarbonate‐extractable inorganic P (traditional Olsen) soil test.…
Possible phases in a nematic liquid crystal confined to a spherical submicrometer droplet embedded in a solid polymer are analyzed in terms of a Landau--de Gennes theory. For a droplet with a radial structure we show that the strength of the nematic-polymer interfacial interaction affects the nematic-paranematic (part…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of nonionic gadolinium chelates useful as contrast agents for magnetic resonance imaging: 1,4,7-tris(carboxymethyl)-10-substituted-1,4,7,10-tetraazacyclododecanes and their corresponding gadolinium chelatesD. D. Dischino, E. J. Delaney, J. E. Emswiler, G. T. Gaugha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance studies on electrochemically prepared poly(3-dodecylthiophene)Masaaki Sato and Hisayuki MoriiCite this: Macromolecules 1991, 24, 5, 1196–1200Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue 1 Mar…
A series of segmented polyurethanes (SPUs) containing various polyol soft segments was prepared and their resistance to oxidative degradation was investigated after aging in AgNO3 solution. The SPU with the polyether soft segment showed a large reduction in mechanical strength after exposure to the oxidative environme…
Finnis-Sinclair (F-S) type many-body potentials have been constructed for eight hexagonal metals: Co, Zr, Ti, Ru, Hf, Zn, Mg and Be. The potentials are parameterized using cubic splines and fitted to the cohesive energy, unrelaxed vacancy formation energy, five independent second-order elastic constants and two eauili…
Caflisch & Luke (1985) showed that, owing to the long range of the hydrodynamie interactions, the variance of the sedimentation velocity in a random suspension with uniform probability for the positions of the particles is divergent in the sense that it grows without bound as the macroscopic linear dimension of th…
Two component mixtures containing liquid crystalline diacrylates and liquid crystal molecules with no reactive groups have been made. Upon photopolymeriz-ation of the mixtures anisotropic networks containing liquid crystal molecules which were not chemically attached to the networks were created. In these systems the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMutually interpenetrating inorganic-organic networks. New routes into nonshrinking sol-gel composite materialsMark W. Ellsworth and Bruce M. NovakCite this: J. Am. Chem. Soc. 1991, 113, 7, 2756–2758Publication Date (Print):March 1, 1991Publication History Published online1 M…
Probe beam deflection (PBD) was used to monitor the ion exchange between polymer film and bulk electrolyte during the redox reaction in polyaniline in aqueous electrolyte ( , , ). The PBD results clearly show that protons as well as anions are exchanged during the first oxidation process. Protons are exchanged at pote…