Materials Literature
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Magnetic properties of a tetrahedral "Ni_4" molecule are discussed in terms of the Heisenberg model, with magnetic anisotropy terms included, and on the basis of first-principle calculations within the density functional theory. It is shown that the isotropic Heisenberg model does not provide an adequate description o…
A wetting transition occurs when the contact angle of a liquid drop on a surface changes from a nonzero value to zero. Such a transition has never been observed for water on any solid surface. This paper discusses the value of the temperature T_w at which the transition should occur for water on graphite. A simple mod…
Crystals of tetracene have been studied by means of lattice phonon Raman spectroscopy as a function of temperature and pressure. Two different phases (polymorphs I and II) have been obtained, depending on sample preparation and history. Polymorph I is the most frequently grown phase, stable at ambient conditions. A pr…
Abstract A solid‐state mechanochemical pulverization process, that is, pan milling, was used to prepare a polypropylene (PP)/carbon nanotube (CNT) composite powder. The composite powder was then melt‐mixed with a twin‐roll masticator to obtain a PP/CNT composite. The morphology of the PP/CNT powder and the PP/CNT comp…
A nonlithographic second-order self-assembly process for synthesizing uniform and ordered arrays of nanorods and nanodots is presented and applied to the fabrication of ZnO nanorod arrays. Nucleation sites were defined by patterning Au nanodot catalysts with a self-organized array of nanopores formed in anodized alumi…
We report on the microwave response properties of the ZnO nanowire-polyester composites fabricated into a planar plate with the area of 180×180 mm2 and the thickness of about 1 mm. Strong microwave absorption has been observed in X band and the maximum absorption is enhanced as the concentration of the nanowires incre…
Silver nanoplates, with average thickness of 20−30 nm and average size tunable from 40 to 300 nm, have been synthesized via a simple room-temperature solution-phase chemical reduction method in the presence of appropriate concentrations of cetyltrimethylammonium bromide (CTAB) and silver seeds. On the surface of the (…
We have added force and displacement measurement capabilities in the transmission electron microscope (TEM) for in situ quantitative tensile experimentation on nanoscale specimens. Employing the technique, we measured the stress-strain response of several nanoscale free-standing aluminum and gold films subjected to se…
Pure and Mg doped ZnO thin films were deposited at 400 °C on glass substrates by pulsed laser deposition. An x-ray diffractometer (XRD) was used to investigate the structural properties of the thin films. It is found that all the thin films have a preferred (002) orientation. The peak position of (002) orientation is…
We report on fabrication of field-effect transistors (FETs) based on transition metal dichalcogenides. The unique structure of single crystals of these layered inorganic semiconductors enables fabrication of FETs with intrinsically low field-effect threshold and high charge carrier mobility, comparable to that in the…
We apply the recently developed plasmon hybridization method to nanoparticle dimers, providing a simple and intuitive description of how the energy and excitation cross sections of dimer plasmons depend on nanoparticle separation. We show that the dimer plasmons can be viewed as bonding and antibonding combinations, i…
Abstract Hydrophobic derivatives of D ‐glucaric acid, HOOC−(CHOH) 4 −CONHR,where R is an alkyl chain having 3, 8, 10, or 12 carbon atoms, have been synthesized from D ‐glucaro‐1,4‐lactone and the corresponding amines. The complexing abilities of these compounds toward trivalent lanthanide cations have been studied, us…
Abstract An algorithm is introduced for the molecular simulation of constant‐pressure plastic deformation in amorphous solids at zero temperature. This allows to directly study the volume changes associated with plastic deformation (dilatancy) in glassy solids. In particular, the dilatancy of polymer glasses is an imp…
A novel drug delivery system, bullfrog skin collagen film, was employed to release bovine serum albumin (BSA). The biophysical properties of bullfrog skin collagen film used were evaluated by thermal denaturation temperature and percentage water loss. The film obtained exhibited good stability and can be taken as a go…
Abstract Acrylamide was grafted to an xanthate mixture of carboxymethylcellulose with a sodium bisulfate/ammonium persulfate redox initiator system in water, sodium hydroxide, potassium hydroxide, and dioxane at 40, 50, 60, 70, and 80°C during a reaction period of 2 h. The grafted polymer and homopolymer were isolated…
Pyridoxine (vitamin B(6)) is not only an essential cofactor in amino acid biosynthesis but has recently been added to the list of potent antioxidants found in plants (Bilski et al., 71: 129-134, 2000). Herein the cloning of a gene (pvPDX1) from Phaseolus vulgaris that has a high degree of similarity to PDX1 from Cerco…
Abstract Summary: The polymorphisms in poly(hexamethylene terephthalate) (PHT), along with their associated melting and spherulite morphologies, were examined by differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction (WAXD), and polarized‐light microscopy (PLM). The morphology and crystal cells were dep…
The heat capacities were measured by adiabatic calorimetry down to 6 K on both the right-handed isomer and a racemic mixture of 4-(1-methylheptyloxy)-4‘-cyanobiphenyl. A thermodynamic relationship between two crystalline phases has been established and inversion between the stable and the metastable crystals has been…
The structural transformations of a MgO-attached [Ru 6 C] cluster catalyst during carbonylation under CO/H 2 and decarbonylation under vacuum were studied by energy-dispersive X-ray absorption fine structure (DXAFS). The DXAFS study revealed that the carbonylation of [Ru 6 C]/MgO to [Ru 6 C(CO) 11 ]/MgO proceeded via…
While direct laser desorption ionization of soluble polyaniline dried onto metal sample plates results in mass spectra that are similar to previously shown electrospray ionization data of similar samples, laser desorption of unsolubilized solid polyaniline results in major fragmentation of the phenyl rings. Solventles…