Materials Literature
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The catalytic oxidation activity of platinum particles in automobile catalysts is thought to originate from the presence of highly reactive superficial oxide phases which form under oxygen-rich reaction conditions. Here we study the thermodynamic stability of platinum oxide surfaces and thin films and their reactiviti…
We investigated effects of annealing time on structural and magnetic properties of the L10-FePt nanoparticles synthesized by the SiO2-nanoreacter method. The magnetization and powder X-ray diffraction studies revealed that the annealing at 900 oC for 9 hr could convert all of the fcc-nanoparticles to the well-crystall…
Using bases of fourth rank tensorial bases of complete Voigt's symmetry elaborated by Walpole we obtained expressions for inverse of Young's modulus E, inverse of shear modulus G and Poisson's ratio, which depend on components of the stiffness tensor S, on direction cosines of vectors n of uniaxial load and the vector…
The relationship between nonlinear susceptibilities and hyperpolarizabilities defined using different conventions is reexamined. In previous work [Willetts et al., J. Chem. Phys. 97, 7590 (1992)], relations between different conventions for microscopic hyperpolarizabilities have been derived, but the application of th…
A five-level {\Pp} model of the band structure for GaAs-type semiconductors is used to describe the spin $g^*$-factor and the cyclotron mass $m^*_c$ of conduction electrons in GaAs/Ga$_{1-x}$Al$_x$As quantum wells in an external magnetic field parallel to the growth direction. It is demonstrated that the previous theo…
Core/shell particles and capsules formed by a layer-by-layer technique are biofunctionalized with a humanized A33 monoclonal antibody (huA33 mAb) that binds to the A33 antigen present on colorectal cancer cells (see figure). Targeting to a colorectal cancer cell line shows selective binding and internalization of part…
Alternative adsorbents: Spherical particles of a phenylene-bridged periodic mesoporous organosilica material (see picture) are applied in HPLC for the first time. Three test mixtures of up to four components with different polarities can be separated with the new column material.
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEffect of Confinement on Polymer Segmental Motion and Ion Mobility in PEO/Layered Silicate NanocompositesM. M. Elmahdy, K. Chrissopoulou, A. Afratis, G. Floudas, and S. H. AnastasiadisView Author Information Department of Physics, U…
The recently discovered scaling law for the relaxation times, tau(T,upsilon) = I(Tupsilon(gamma)), where T is temperature and upsilon the specific volume, is derived by a revision of the entropy model of the glass transition dynamics originally proposed by Avramov [J. Non-Cryst. Solids 262, 258 (2000)]. In this modifi…
Fourth-rank tensors of complete Voigt's symmetry, that embody the elastic properties of crystalline anisotropic substances, were constructed for all 2D crystal systems. Using them we obtained explicit expressions for inverse of Young's modulus E, inverse of shear modulus G and Poisson's ratio, which depend on componen…
A model for diffusion-controlled spherical particle growth is presented and solved numerically, showing how, on cooling at sufficient rate from a given fraction solid, growth velocity first increases, and then decreases rapidly when solute fields of adjacent particles overlap. An approximate analytical solution for th…
Abstract Summary: Environmentally‐friendly SPI/cellulose whisker composites were successfully prepared using a colloidal suspension of cellulose whiskers, to reinforce soy protein isolate (SPI) plastics. The cellulose whiskers, having an average length of 1.2 µm and diameter of 90 nm, respectively, were prepared from…
Single-wall boron nitride nanotubes samples synthesized by laser vaporization of a hexagonal BN target under a nitrogen atmosphere are studied by UV and visible Raman spectroscopy. We show that resonant conditions are necessary for investigating phonon modes of BNNTs. Raman excitation in the UV (229 nm) provides prere…
Rigid p-octiphenyl rods were used to create helical tetrameric pi-stacks of blue, red-fluorescent naphthalene diimides that can span lipid bilayer membranes. In lipid vesicles containing quinone as electron acceptors and surrounded by ethylenediaminetetraacetic acid as hole acceptors, transmembrane proton gradients ar…
Solid state materials capable of storing hydrogen with high gravimetric (9 wt %) and volumetric density (70 g/L) are critical for the success of a new hydrogen economy. In addition, an ideal storage system should be able to operate under ambient thermodynamic conditions and exhibit fast hydrogen sorption kinetics. No…
Mixing it up: A ground spin state of S=83/2 is found in the mixed-valent manganese aggregate [MnIII12MnII7(μ4-O)8(μ3,η1-N3)8(HL)12(MeCN)6]2+ (H3L=2,6-bis(hydroxymethyl)-4-methylphenol; see polyhedral representation of the core) and arises through ferromagnetic coupling of all the metal centers.
Hierarchical self-assembly offers a powerful strategy for producing molecular nanostructures. Although widely used, the mechanistic details of self-assembly processes are poorly understood. We spectroscopically monitored a nucleation process in the self-assembly of p-conjugated molecules into helical supramolecular fi…
Four different types of chitosan-based nanocomposite films were prepared using a solvent-casting method by incorporation with four types of nanoparticles, that is, an unmodified montmorillonite (Na-MMT), an organically modified montmorillonite (Cloisite 30B), a Nano-silver, and a Ag-zeolite (Ag-Ion). X-ray diffraction…
This chapter contains sections titled: Introduction Primary Species in the Radiolysis of Sulfoxides The Final Products in the Radiolysis of Sulfoxides The Primary Species in the Radiolysis of Sulfones The Final Products in the Radiolysis of Sulfones The Radiolysis of Solutions of Poly(Olefin Sulfone)s References
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