Mechanisms for exchange bias
Equation (9) is corrected to Figure 19(b) is also corrected. Figure 1. Geometry. The angles θ, ϕ, and ξ are defined, specifying the transformed magnetizations. The angles are functions of position, y .
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Optical study on a phase transition of fresnoiteBa2Si2TiO8
Fresnoite ${\mathrm{Ba}}_{2}{\mathrm{Si}}_{2}{\mathrm{TiO}}_{8}$ is a ferroelectric with promising piezoelectric uses that exhibits unusual pyroelectric, elastic, and other property anomalies close to 433 K. X-ray diffraction analyses at 297 and 573 K by Markgraf et al. determined the space group to be $P4\mathrm{bm}$…
pH Regulates Cation Selectivity of Poly-(R)-3-hydroxybutyrate/Polyphosphate Channels from E. coli in Planar Lipid Bilayers
Poly-(R)-3-hydroxybutyrate/polyphosphate (PHB/polyP) complexes, whether isolated from the plasma membranes of bacteria or prepared from the synthetic polymers, form ion channels in planar lipid bilayers that are highly selective for Ca(2+) over Na(+) at physiological pH. This preference for divalent over monovalent ca…
Ordered single-crystalline Bi nanowire arrays embedded in nanochannels of anodic alumina membranes
Single-crystalline Bi nanowire arrays have been assembled into the nanochannels of anodic alumina membranes by electrodeposition. X-ray diffraction and transmission electron microscopy investigations revealed that the nanowires with diameter of either 50 nm or 20 nm are essentially single crystalline and highly orient…
Structural and magnetic properties of RCo12-xTix(R = Y and Sm) and YFe12-xTixcompounds
Magnetic and structural properties of RCo12-xTix with R = Y and Sm and YFe12-xTix compounds have been investigated by using x-ray diffraction and magnetic measurements. It was found that all compounds investigated are almost single phase with the ThMn12-type structure. X-ray diffraction patterns of magnetically aligne…
A Quantum Mechanical/Neural Net Model for Boiling Points with Error Estimation
We present QSPR models for normal boiling points employing a neural network approach and descriptors calculated using semiempirical MO theory (AM1 and PM3). These models are based on a data set of 6000 compounds with widely varying functionality and should therefore be applicable to a diverse range of systems. We incl…
Fabrication of Various Ordered Films of Oxotitanium(IV) Phthalocyanine by Vacuum Deposition and Their Spectroscopic Behavior
Different types of ordered solid films of oxotitanium(IV) phthalocyanine (OTiPc) were grown in 50−500 nm thickness by vacuum deposition onto such conventional substrates as metal- and ITO-coated glass and neat glass at a rate of ∼0.05 nm s - 1 . Under 10 - 3 −10 - 4 Pa isotropic films with short-range molecular organi…
Adsorption of Semiflexible Polymers on Flat, Homogeneous Surfaces
We investigated the problem of adsorption of a single semiflexible polymer chain on to a planar, homogeneous surface using off-lattice Monte Carlo simulations. Adsorption characteristics were studied at different temperatures for chains of various stiffnesses. We have found that the stiffer chains adsorb more onto the…
A Computational Study of the Interactions among the Nitro Groups in Octanitrocubane
Ab initio molecular orbital and density functional calculations on isodesmic disproportionation reactions of nitrated cubanes indicate that the repulsion between nitro groups on adjacent carbons in octanitrocubane (ONC) is surprisingly small and that the energy required for successive substitutions of nitro groups on…
Influence of Water on Structure and Mechanical Properties of Regenerated Cellulose Studied by an Organized Combination of Infrared Spectra, X-ray Diffraction, and Dynamic Viscoelastic Data Measured as Functions of Temperature and Humidity
An intimate relation between structure and mechanical properties of regenerated cellulose (Rayon, Benberg, etc.) has been investigated by measuring the humidity and temperature dependencies of infrared spectra, X-ray diffraction, and dynamic viscoelastic properties. At first the dynamic viscoelastic property and the i…
Droplets Speeding on Surfaces
How fast a droplet will spread on a solid surface depends on the surface tension gradient and the wettability. The temperature dependence of the surface tension is exploited in a so-called Marangoni flow, but capillary forces can counteract this type of flow. Wasan et al. highlight the report by Danielet al., who have…
Automated Single-Particle SEM/EDX Analysis of Submicrometer Particles down to 0.1 μm
Typically single-particle SEM/EDX analysis of aerosols is done on polycarbonate filters or solid carbon substrates. This has led to a widespread conclusion that EDX provides poor information on carbon, oxygen, and nitrogen content of a particle and usually could not go below 0.5-microm particles. We show that use of g…
Isotopic and Chemical Titration of Acid Sites in Tungsten Oxide Domains Supported on Zirconia
The acid and surface properties of WO x −ZrO 2 solid acid catalysts were examined as a function of WO x surface density. Surface density strongly influences the size and electronic properties of WO x domains and the rate of acid-catalyzed reactions on these materials. The adsorption and isotopic exchange of acid and r…
Ising Dipoles on the Triangular Lattice
A cluster Monte Carlo method for systems of classical spins with purely dipolar couplings is presented. It is tested and applied for finite arrays of perpendicular Ising dipoles on the triangular lattice. This model is a modification with long-range interactions of the geometrically frustrated Ising antiferromagnet. F…
Relativistic Theory of Superconductivity
The relativistic generalization of the theory of superconductivity is reviewed with respect to its conceptual basis and first applications. The construction of relativistically covariant order parameters for superconductors is outlined and the generalization of the Dirac equation for the superconducting state is prese…
Mesoporous Polystyrene Monoliths
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMesoporous Polystyrene MonolithsAndrew S. Zalusky, Roberto Olayo-Valles, Charles J. Taylor, and Marc A. HillmyerView Author Information Department of Chemistry, University of Minnesota Minneapolis, Minnesota 55455 Cite this: J. Am. Chem. Soc. 2001, 123, 7, 1519–1520Pub…
Melt Rheology of High l -Content Poly(lactic acid)
The melt rheology of linear poly(lactic acid)s (PLA) characterized by a high content of the l -form of the monomer is comprehensively investigated. Measurements of dynamic, steady, and transient shear viscosities are presented. Extensional data on PLA are presented for the first time and show a strong strain hardening…
A Novel Europium(III)-Based MRI Contrast Agent
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Novel Europium(III)-Based MRI Contrast AgentShanrong Zhang, Patrick Winter, Kuangcong Wu, and A. Dean SherryView Author Information Department of Chemistry, University of Texas at Dallas P.O. Box 830688, Richardson, Texas 75083 Department of Radiology Rogers Magnetic…
New Hybrid Organic−Inorganic Solids with Helical Morphology via H-Bond Mediated Sol−Gel Hydrolysis of Silyl Derivatives of Chiral (R,R)- or (S,S)-Diureidocyclohexane
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNew Hybrid Organic−Inorganic Solids with Helical Morphology via H-Bond Mediated Sol−Gel Hydrolysis of Silyl Derivatives of Chiral (R,R)- or (S,S)-DiureidocyclohexaneJoël J. E. Moreau, Luc Vellutini, Michel Wong Chi Man, and Catherine BiedView Author Information Laborat…
Synthesis and Structural Analysis of Two Constitutional Isomeric Libraries of AB 2 -Based Monodendrons and Supramolecular Dendrimers
The synthesis and structural analysis of two constitutional isomeric libraries of self-assembling AB 2 monodendrons based on 3,4- and 3,5-disubstituted benzyl ether internal repeat units containing four different first generation monodendrons, i.e., 3,4,5-tris( n -dodecan-1-yloxy)benzyl ether, 3,4-bis( n -dodecan-1-yl…