Materials Literature
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A direct simulation of phonon-mediated heat transfer is described and preliminary results are reported. The method is derived from past work in simulating gas-dynamic flow and uses a linear array of cells for modeling a one-dimensional heat transfer problem. Central to the development of the technique is the Debye mod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCamphorsulfonic Acid Fully Doped Polyaniline Emeraldine Salt: In situ Observation of Electronic and Conformational Changes Induced by Organic Vapors by an Ultraviolet/Visible/Near-Infrared Spectroscopic MethodYounan Xia, Alan G. MacDiarmid, and Arthur J. EpsteinCite this: Ma…
The protein super-family of medium-chain alcohol dehydrogenases (and glutathione-dependent formaldehyde dehydrogenase), polyol dehydrogenases, threonine dehydrogenase, archaeon glucose dehydrogenase, and eye lens reductase-active zeta-crystallins also includes Escherichia coli quinone oxidoreductase, Torpedo VAT-1 pro…
Type XII and XIV collagens are very large molecules containing three extended globular domains derived from the amino terminus of each alpha chain and an interrupted triple helix. Both collagens are genetically and immunologically unique and have distinct distributions in many tissues. These collagens localize near th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase Separation in Starblock Copolymer MeltsM. W. Matsen and M. SchickCite this: Macromolecules 1994, 27, 23, 6761–6767Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://pubs.acs.org/doi/10.10…
We present the results of a detailed molecular-dynamics study of relaxation in the van der Waals system ortho-terphenyl in the supercooled regime. The molecule is described by a simple rigid three-site model, with interactions between different molecules of the Lennard-Jones form. We find that the long-time (\ensurema…
The nonlinear optical properties of charge-transfer organic materials are discussed in the framework of a simple valence-bond charge-transfer model. This model leads to analytic formulas for the absorption frequency, hyperpolarizabilities, and bond length alternation, all of which are described in terms of three param…
The phonon frequencies at the \ensuremath{\Gamma} point, the Born effective charges, and the dielectric permittivity tensors of ${\mathrm{TiO}}_{2}$ rutile are calculated using the variational density-functional perturbation theory. The calculated phonon frequencies agree with experiment within a few percent. We analy…
The singular nature of the hard sphere potential combined with lubrication stresses near contact poses interesting issues with respect to the high frequency viscoelastic behavior. Dilute theories demonstrate clearly that soft potentials and/or lubrication stresses that reduce the relative mobility to zero at contact l…
The tensile creep behavior of two ceramic composite systems exhibiting duplex microstructures was studied relative to their single‐phase constituents in the temperature and stress ranges of 1100–1350°C and 35–75 MPa. The equivolumetric compositions in the Al 2 O 3 : c –ZrO 2 (8 mol% Y 2 O 3 ) and Al 2 O 3 :Y 3 Al 5 O…
We have measured quantitatively the temperature dependence of the local distortions of ${\mathrm{PbTiO}}_{3}$ crystals below and above the structural ferroelectric phase transition, using x-ray absorption fine-structure (XAFS) measurements. Two probe atoms, Pb and Ti, were used. The results were analyzed by fitting pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Three-Dimensional Ferrimagnetic Materials: K2Mn[Mn(CN)6], Mn3[Mn(CN)6]2.cntdot.12H2O, and CsMn[Mn(CN)6].cntdot.1/2H2OWilliam R. Entley and Gregory S. GirolamiCite this: Inorg. Chem. 1994, 33, 23, 5165–5166Publication Date (Print):November 1, 1994Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNarrow Polydispersity Polystyrene by a Free-Radical Polymerization Process-Rate EnhancementMichael K. Georges, Richard P. N. Veregin, Peter M. Kazmaier, Gordon K. Hamer, and Marko SabanCite this: Macromolecules 1994, 27, 24, 7228–7229Publication Date (Print):November 1, 1994…
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ABSTRACT The effect of heat and enzymatic treatments on physical and moisture barrier properties of soy protein isolate (SPI) edible films were evaluated at three plasticizer levels. Heat treatment produced a film which was smoother and more transparent than unheated SPI films. Heated films had decreased water vapor p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBall and Socket Nanostructures: New Supramolecular Chemistry Based on CyclotriveratryleneJonathan W. Steed, Peter C. Junk, Jerry L. Atwood, Michael J. Barnes, Colin L. Raston, and Robert S. BurkhalterCite this: J. Am. Chem. Soc. 1994, 116, 22, 10346–10347Publication Date (Pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Structures and Gas-Phase Reactivities of Cationic Late-Transition-Metal OxidesAndreas Fiedler, Detlef Schroeder, Sason Shaik, and Helmut SchwarzCite this: J. Am. Chem. Soc. 1994, 116, 23, 10734–10741Publication Date (Print):November 1, 1994Publication History Publ…
We report the observation of nonlinear photorefraction in pure aligned nematic liquid crystals in the presence of an applied dc electric field. The effect is attributed to nematic axis reorientation created by the photoinduced space-charge field in combination with the applied dc field. Strong optical nonlinearity, se…
Separate binding of several purified cellulolytic components of Trichoderma reesei on to filter paper was studied and concomitant hydrolysis rates evaluated. Enhancement of mass transfer from the bulk liquid to the solid substrate by agitation has two different effects on adsorption depending on the type of enzyme: (i…
A combined ex situ x‐ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM) investigation of the passive films formed on Cr(110) single‐crystal surfaces in 0.5 M H 2 SO 4 is reported. The composition, thickness, and structure of the passive films were studied as a function of polarization time an…