Materials Literature
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We report on the transport properties of random networks of single-wall carbon nanotubes fabricated into thin-film transistors. At low nanotube densities (∼1 μm−2) the networks are electrically continuous and behave like a p-type semiconductor with a field-effect mobility of ∼10 cm2/V s and a transistor on-to-off rati…
In the present study, we report the systematic investigation of the effect of chemical oxidation on the structure of single-walled carbon nanotubes (SWNTs) by using different oxidants. The oxidation procedure was characterized by using infrared spectroscopy and transmission electron microscopy (TEM). The SWNTs were pr…
A new asymmetric derivative of 1,4,7-triazacyclononane with two iminocarboxylic pendant arms attached to the macrocyclic ring has been designed and prepared. Lanthanide complexes of L1 and of its previously reported symmetric analogue L, containing three pendant arms, are described. The complexes [Ln(L)] (Ln = Gd, Eu,…
Abstract In this study, polydimethylsiloxane (PDMS)/polyacrylate composite polymer latex was synthesized via polymerization of the acrylate monomer in the presence of vinyl‐containing PDMS seeded latex. The polymerization was initiated by 60 Co γ‐ray irradiation. The morphology of the PDMS/polyacrylate composite polym…
Abstract Ternary mixtures of waste plastics of high density polyethylene (HDPE), poly(vinyl chloride) (PVC), and polystyrene (PS) was recycled using a single‐screw extruder. Poly(ethylene‐ co ‐vinyl acetate) and poly(styrene‐ b ‐ethylene/butylenes‐ b ‐styrene) were introduced as compatibilizers for HDPE/PVC and HDPE/P…
Cubic ZnMgO thin films in the (100) orientation were grown on Si (111) substrates by reactive electron beam evaporation at low substrate temperature. X-ray photoelectron spectroscopy (XPS) analyses show that Mg content as high as 75 at.% in the cubic ZnMgO film can be obtained. Secondary ion mass spectroscopy (SIMS) m…
The wettability of yarns from plain cotton fabric and from polystrene-coated fabric modified by admicellar polymerization was examined by transient force measurements with a microbalance. Analysis of the observed time scales and forces suggests that water transport in cotton yarn proceeds by an initial rapid, capillar…
We elucidate the structural properties of amorphous SiSe2 by first-principles molecular dynamics. The calculated structure factor is in very good agreement with experiments, as well as the number of corner- and edge-sharing tetrahedra. By focusing on the sequences of Si atoms linked via intra- and intertetrahedral bon…
Zinc supported over silica materials, which are widely used in heterogeneous catalysis, are prepared in most cases by incipient wetness impregnation with solutions of zinc nitrate. After calcination, the formation of ZnO is usually assumed, although not always fully demonstrated. The goal of this paper is to clarify t…
A volume in the new Principles and Applications in Engineering series, Tissue Engineering provides an overview of the major physiologic systems of current interest to biomedical engineers: cardiovascular, endocrine, nervous, visual, auditory, gastrointestinal, and respiratory. It contains useful definitions, tables of…
13C-NMR spectroscopy was used to estimate the p K a values for the Tyr(150) (Y150) residue in wild-type and mutant class C beta-lactamases. The tyrosine residues of the wild-type and mutant lactamases were replaced with (13)C-labelled L-tyrosine ([ phenol -4-(13)C]tyrosine) in order to observe the tyrosine residues se…
We study a two-dimensional (2D) system of macroions, trapped at the interface between air and an aqueous electrolyte solution, in the presence of a dielectric substrate approaching the air-water interface from the water side. Working within the linear Debye-Hückel theory, we investigate how the microion-averaged inter…
Using a perturbation theory with a hard-sphere reference system we have directly calculated free energies of fluid and solid phases of aluminum with an embedded atom model potential. Unlike other approaches such as thermodynamic integration, we do not require any simulations. Moreover, the free energies of the two dif…
Angle-dependent X-ray photoelectron spectroscopy (ADXPS) is used to measure end group concentration depth profiles for blends of surface active ω-fluorosilane polystyrene with nonfunctional polystyrene. The fluorine signal is in all cases enhanced at the surface, indicating surface segregation of the lower surface ten…
Doping of polyaniline with a new family of protonating agents, namely sulfosuccinates with alkyl or alkoxy substituents, is discussed. The resulting polyaniline-sulfosuccinates exhibit a lamellar type structural organization in which stacks of polymer chains are separated by dopant anions. Although structurally simila…
Computer simulations were used to study the gel transition occurring in colloidal systems with short-range attractions. A colloid-polymer mixture was modeled and the results were compared with mode coupling theory (MCT) expectations and with the results for other systems (hard-spheres system and Lennard-Jones system).…
A growing group of polyfunctional precursors of polymer networks contains more than one branch point (cross-link). The bonds they extend lead either to another branch point or to a functional group. When such precursors are cross-linked, these branch points are gradually activated to reach the status of elastically ac…
Thiol-derivatized gold clusters (i.e. nano-sized gold crystals coated with a thiolate monolayer, Aun(SR)m, with m ≪ n) based on n-alkanethiols have been obtained by treatment of gold clusters embedded in poly(N-vinylpyrrolidone) (PVP) with thiols. Dodecanethiol (DDT), hexadecanethiol (HDT), and octadecanethiol (ODT) h…
Novel two-dimensional octupoles containing azo groups and their oligomers have been synthesized and their first hyperpolarizabilities were determined. The λmax and β(0) values of azo octupoles are nearly the same regardless of the nature of the bridge or the conjugation length. On the other hand, 1,3,5-tricyano-2,4,6-…
A combination of characterization techniques has been employed to obtain a full description of the structure and chemical state of a series of Co−W/SiO 2 catalysts used for the production of single-walled carbon nanotubes (SWNT) by CO disproportionation at 750−950 °C. The state of Co and W on a series of silica-suppor…