Materials Literature
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Fluoroscopy is a low dose imaging technique. As such, a very sensitive detector is required to create images of good quality. Present day flat panel active matrix read out systems introduce an amount of noise that inhibits present direct and indirect methods from producing optimal quality images at fluoroscopic exposu…
Nanoporous ultrathin films of titania were prepared. First, a titania/poly(acrylic acid) (PAA) nanocomposite film was prepared via the surface sol−gel process, with the thickness of the titania gel layer to be 0.44 ± 0.10 nm/cycle. The organic species in the film were then removed by low-temperature oxygen plasma trea…
The dynamics of Ostwald ripening is treated by cluster distribution kinetics represented by a population balance equation that also describes growth or dissolution. Unlike simple crystal growth driven by supersaturation, the smaller, more soluble clusters in the distribution dissolve during ripening near equilibrium a…
By means of confocal laser scanning microscopy, we directly visualize and quantify the local spatial structure of dense colloidal gels of varying volume fraction formed by short-range attractive interparticle interactions. We find that the short-range structure of the gels is similar to that of dense amorphous hard-sp…
Scanning photoelectron spectromicroscopy has been used to study the onset and the initial stages of oxidation of Ru(0001) at three oxidation temperatures, 625, 675, and 775 K, and oxygen exposures of about 105 Langmuir. The lateral heterogeneity developed during oxide nucleation and growth and the local composition of…
Abstract The effect of molecular architecture on the properties of crosslinked polylactides was studied. D,L ‐Lactide‐based telechelic oligomers with different numbers of arms were functionalized with methacrylic anhydride. Functionalized oligomers were crosslinked with thermal initiation at 90°C, and the mechanical a…
We report experimental results for the wetting states of a melt of polystyrene in contact with a brush of polystyrene chains end-attached to a substrate. Wettability was assessed by monitoring the stability of an ultrathin film of the molten polymer; if the film remained stable and uniform for several days, it was con…
Alternate layer deposition of heterostructured magnesium oxide (MgO):barium strontium titanate (BST) thin films is demonstrated to be an approach to synthesize dielectric films with a higher figure of merit for microwave dielectric applications. The dielectric constant and the dielectric tunability are modified by MgO…
Single-wall carbon nanotubes (SWNTs) were functionalized by oligomeric species containing derivatized pyrenes. Absorption and emission properties of the pyrene moieties tethered to the functionalized SWNTs were studied in homogeneous solution. The absorption spectra suggest no significant ground-state complexation bet…
Abstract A series of poly(ethylene‐ co ‐1‐hexene) samples made with rac ‐ethylene bis(indenyl)zirconium dichloride/methylaluminoxane were analyzed by crystallization analysis fractionation (CRYSTAF). The nine samples had comonomer contents of 0–4.2 mol % 1‐hexene with a narrow range of molecular weights (34,000–39,000…
This paper explores the crystallization of glycine from aqueous solution within a variety of colloidal systems in which the dimension of the crystallization environment varies from micrometers to nanometers. The study focuses on the polymorphic outcome of crystallization experiments and the extent to which crystal siz…
We report a method of making nanowires of bismuth (Bi) with diameters ranging from 30 to 200 nm and lengths up to several millimeters. The nanowires are extruded spontaneously at the rate of a few micrometers per second at room temperature from the surfaces of freshly grown composite thin films consisting of Bi and ch…
The molecular mechanism of the strain–stress behavior of the ABA triblock copolymer is studied by combining self-consistent field (SCF) calculation and molecular dynamics (MD) simulation. First, the equilibrium structure was obtained by the SCF calculation. The bridge fraction φbridge was found to be about 0.4, 0.6, a…
Hydrophilization of poly(methyl methacrylate) (PMMA) substrates has been demonstrated using a excimer lamp radiating vacuum ultraviolet (VUV) light of 172 nm in wavelength. In this study, we have particularly focused on the effects of atmospheric pressure during VUV irradiation. Each of the substrates was photoirradia…
The one-body tunnel picture of single-molecule magnets (SMMs) is not always sufficient to explain the measured tunnel transitions. An improvement to the picture is proposed by including also two-body tunnel transitions such as spin-spin cross relaxation (SSCR) which are mediated by dipolar and weak superexchange inter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermodynamic Properties of Phosphorus and Solid Binary PhosphidesMark E. SchlesingerView Author Information Department of Metallurgical Engineering, University of MissouriRolla, 1870 Miner Circle, Rolla, Missouri 65409-0340 Cite this: Chem. Rev. 2002, 102, 11, 4267–4302…
A detailed analysis of the structure and the thermal behavior of samples of isotactic polypropylene (iPP) prepared with a highly regiospecific metallocene catalysts is presented. The samples present variable amounts of stereodefects (isolated rr triads) and provide the first example of metallocene-made iPP not includi…
We performed measurements of a series of adsorption–desorption isotherms of nitrogen into MCM-41 and SBA-15 mesoporous molecular sieves with different pore sizes in a wide temperature range between a bulk triple point (Tt) and a bulk critical point (Tc). The hysteresis loop shrinks with increasing temperature and even…
Molecular memory devices with semiconducting single-walled carbon nanotubes constituting a channel of 150 nm in length are described. Data storage is achieved by sweeping gate voltages in the range of 3 V, associated with a storage stability of more than 12 days at room temperature. By annealing in air or controlled o…
UNDULATORS AND WIGGLERS Electron Beam Dynamics, L. Farvacque Generalities on the Synchrotron Radiation, P. Elleaume Undulator Radiation, P. Elleaume Bending Magnet and Wiggler Radiation, R.P. Walker Technology of Insertion Devices, J. Chavanne and P. Elleaume Polarizing Undulators and Wigglers, H. Onuki Undulators Wig…