Materials Literature
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Nanocrystalline solids are polycrystals, the crystal size of which is a few (typically 1 to 10) nanometres so that 50% or more of the solid consists of incoherent interfaces between crystals of different orientations. Solids consisting primarily of internal interfaces represent a separate class of atomic structures be…
A minimum exists in the electrical conductivity of the perovskite-type ceramic ${\mathrm{LaCr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Mn}}_{\mathit{x}}$${\mathrm{O}}_{3}$ as a function of Mn content near x=0.05. This minimum has been explained in terms of a crossover from multiple trapping to percolation amon…
The dependency of the conductivity of polyaniline (emeraldine oxidation state) on its molecular weight has been determined. Uni- and biaxially oriented films and uniaxially oriented fibers of emeraldine base have been studied and the dependency of their degree of crystallinity, tensile strength, and conductivity (afte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHalo- and alkyl(pentamethylcyclopentadienyl)[1,2-bis(diphenylphosphino)ethane]iron(III) 17-electron complexes: synthesis, NMR and magnetic properties and EHMO calculationsChristophe Roger, Paul Hamon, Loic Toupet, Hassan Rabaa, Jean Yves Saillard, Jean Rene Hamon, and Claude…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotacticity effect on crystallization and melting in polypropylene fractions. II. Linear crystal growth rate and morphology studyJames J. Janimak, Stephen Z. D. Cheng, Paul A. Giusti, and Eric T. HsiehCite this: Macromolecules 1991, 24, 9, 2253–2260Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of poly(2-vinylpyridine)-poly (styrene) block copolymers from toluene solutionsEdward Parsonage, Matthew Tirrell, Hiroshi Watanabe, and Ralph G. NuzzoCite this: Macromolecules 1991, 24, 8, 1987–1995Publication Date (Print):April 1, 1991Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoregulation of papain activity through anchoring photochromic azo groups to the enzyme backboneItamar Willner, Shai Rubin, and Azalia RiklinCite this: J. Am. Chem. Soc. 1991, 113, 9, 3321–3325Publication Date (Print):April 1, 1991Publication History Published online1 May…
The thermodynamic properties of LaCrO 3 and related compounds have been estimated and utilized to correlate sinterability with phase relations in the La‐M‐Cr‐O ( M = Mg , Ca , Sr ) systems. Chemical equilibria calculations reveal that calculated vapor pressures of gaseous chromium oxides (especially CrO 3 ) can be wel…
Recent studies have established that not only some polymeric materials exhibit nematic biaxial phases, but that also low molecular weight compounds can do so if certain structural conditions are met. In this paper new developments in the field of thermotropic N, phases of low mass synthetic products are discussed rega…
The dielectric properties and conductivities (\ensuremath{\sigma}) of ${\mathrm{BaTiO}}_{3}$ doped with 0.03 mol % of ${\mathrm{La}}_{2}$${\mathrm{O}}_{3}$ or ${\mathrm{Gd}}_{2}$${\mathrm{O}}_{3}$ were investigated in the temperature range of 10--300 K. A speculation over the experimental results, such as the temperat…
The corrosive interaction of wet elemental sulfur with construction materials is reviewed, emphasizing effects of alloy composition (carbon steels, ferritic steels, austenitic steels, ferritic-austenitic [duplex] steels, Ni- and Co-base alloys, and titanium and its alloys), medium composition (salts, partial pressures…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamical heterogeneity in a miscible polymer blendC. M. Roland and K. L. NgaiCite this: Macromolecules 1991, 24, 9, 2261–2265Publication Date (Print):April 29, 1991Publication History Published online1 May 2002Published inissue 29 April 1991https://pubs.acs.org/doi/10.1021/…
The temperature and pressure dependences of the dielectric constants have been measured on the mixed-stack organic charge-transfer crystal, tetrathiafulvalene-p-chloranil, in a frequency range from 100 Hz to 10 MHz. The dielectric response increases remarkably with decreasing temperature down to ${\mathit{T}}_{\mathit…
The heat capacity of ${\mathrm{Fe}}_{3(1\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}})}$${\mathrm{O}}_{4}$, was systematically measured for nine samples in the composition range 00.012 and for temperatures between 5 and 200 K. The character of the heat-capacity anomaly at the Verwey transition changed at \ensure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of molecular sieves from dense layered metal oxidesMichael E. Landis, B. A. Aufdembrink, P. Chu, I. D. Johnson, G. W. Kirker, and M. K. RubinCite this: J. Am. Chem. Soc. 1991, 113, 8, 3189–3190Publication Date (Print):April 1, 1991Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase diagrams of binary polymer solutions and blendsCaibao Qian, Stephen J. Mumby, and B. E. EichingerCite this: Macromolecules 1991, 24, 7, 1655–1661Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://pu…
Abstract The RAPRENO x process for NO reduction in combustion products involves reaction of nitric oxide with isocyanic acid. We have developed a mechanism for the gas‐phase reaction of isocyanic acid with nitric oxide in the presence of various amounts of O 2 , H 2 O, and CO. Kinetics calculations using the mechanism…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicelle formation of BAB triblock copolymers in solvents that preferentially dissolve the A blockN. P. Balsara, M. Tirrell, and T. P. LodgeCite this: Macromolecules 1991, 24, 8, 1975–1986Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Publ…
This paper attempts to formalize the field of Integrated Ferroelectrics. The history of devices that include ferroelectrics and semiconductor hybrids is reviewed. The modern ferroelectric device is a combination of ferroelectric thin-films onto a semiconductor single crystal substrate. The evolution of the field in th…
Anisotropic-conductiity (\ensuremath{\sigma}), thermopower, and dielectric-constant studies show that oriented polyaniline salt is representative of a class of quasi-one-dimensional disordered conductors where coupled parallel chains form ``metallic'' bundles in which electron wave functions are extended three dimensi…