Materials Literature
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Electrochemical copolymerization of diphenylamine (DPA) with anthranilic acid (AA) was performed in aqueous 4 M H 2 SO 4 solution for different feed ratios of DPA using cyclic voltammetry. The copolymer film was grown for different numbers of cycles, C n , and feed ratios of DPA. Electrochemical homopolymerization of…
A 150-200°C atomic layer deposition (ALD) process has been developed for advanced gap and tunnel junction applications for thin films heads. The primary advantage of the ALD process is the near 100% step coverage with properties that are uniform along the sidewall. This process provides smooth ( R a ≃ 2 Å ) , pure (im…
Cluster formation can be induced in situ in SWNTs filled with ZrCl4 by electron beam irradiation of SWNT/ZrCl4 composites within a field emission gun transmission electron microscope (FEGTEM); the process represents a possible route to the synthesis of 1D-quantum dot arrays formed by related materials.
Decavanadate anions with various degrees of protonation were crystallized with tetraalkylammonium cations, R4N+, where R represents CH3, C2H5, n-C3H7, or n-C4H9. Structure analyses of seven such crystals reveal that these cations allow decavanadate anions to assemble with each other forming various kinds of hydrogen-b…
To date, one approach to tissue engineering has been to develop in vitro conditions to ultimately fabricate functional cardiovascular structures prior to final implantation. In our current experiment, we developed a new pulsatile flow system that provides biochemical and biomechanical signals to regulate autologous pa…
With some exceptions, surface chemistry had little effect on platelet and leukocyte activation, and cell deposition, by scanning electron microscopy after blood exposure and clotting times among a group of 12 unmodified and plasma modified tubings. All materials activated platelets and leukocytes to detectable levels,…
The oxo-centred trinuclear complex [Fe3O(O2CPh)6(py)3]ClO4·py and its fully deuteriated analogue have been synthesized. X-Ray crystallography at T = 233 K shows that the complex has threefold symmetry, space group P63/m. Incoherent inelastic neutron scattering spectra at T = 1.5 K however show the presence of two ineq…
The effects of small amounts of achiral photochromic dopants, 4,4′-di-n-alkylazobenzenes, with various lengths of substituted alkyl chain (CnH2n + 1 ∶ n = 4, 7, 11, 12, 13, 14, 15, 16) on the helical pitch of a cholesteric liquid crystal (CLC) with ca. 1000 molecular weight were investigated in order to utilise the ch…
The surface of a polyhedral oligomeric silsesquioxane-polyurethane copolymer has been characterized in situ using X-ray photoelectron spectroscopy before and after exposure to incremental fluences of oxygen atoms produced by a hyperthermal oxygen atom source. The data indicate that the atomic oxygen initially attacks…
A newly developed novel rapid densification process named Spark Plasma Sintering (SPS) has been successfuly applied to compact silicon nitride based ceramics. In this process the precursor powders are pressed uniaxially in a carbon die, and an on–off pulsed DC voltage is applied simultaneously. The current passes thro…
Polyaniline (PANi) and poly(1,5-diaminonaphthalene) (PDAN) films can be deposited on iron from aqueous sulfuric acid. The films exhibit electroactive properties similar to those of PANi and PDAN generated on platinum. Electrosynthesis performed in the presence of both monomers leads to a composite film which presents…
Four new complexes of formula [MCl2(IM2py)2], where M = Mn(II), Co(II), Ni(II) or Zn(II); IM2py = 4,4,5,5-tetramethyl-2-(2-pyridyl)-imidazolin-1-oxyl, have been prepared, and examined from viewpoints of the crystal structures, magnetic and spectroscopic properties. All the complexes crystallize in an isomorphous space…
The design, atomic characterization, performance, and relevance to clean technology of two distinct categories of new nanocatalysts are described and interpreted. Exceptional molecular selectivity and high activity are exhibited by these catalysts. The first category consists of extended, crystallographically ordered…
There is a tremendous need for organs and tissues to replace those lost due to diseases or trauma. In theory, transplanting cells on biomaterial matrices can create functional tissue. A critical question, however, is how to supply cells embedded within large cell-polymer constructs with sufficient oxygen and nutrients…
An ultra-fine grained (UFG) structure was introduced in a commercial 5083 Al alloy with an initial grain size of ∼ 200 \\micron using the equal channel angular pressing (ECAP) technique. ECAP was successfully conducted at 473 K on the same sample up to a total of 8 pressings through the die such that the sample was ro…
Chemical deposition techniques show distinct advantages for research tasks as well as for microelectronic production lines. This review will summarize the state of the art of the Chemical Solution Deposition (CSD) and of the Metal-Organic Chemical Vapor Deposition (MOCVD) processes for high-permittivity, ferroelectric…
The possible reduction of the chemical erosion yield of carbon Y chem with increasing hydrogenic ion flux is a critical issue for the use of carbon based plasma facing materials in future high flux confinement devices. The PISCES linear plasma device is used to assess carbon Y chem through nearly an order of magnitude…
Spiropyran or its preferred configurational isomers, respectively, are incorporated in faujasite (NaY, HY and DAY) cages by in situ synthesis, and in Si-MCM-41 channels by wetness impregnation. Luminescence spectra of the colored isomers indicate the non-aggregated incorporation of merocyanine forms. High quantum yiel…
Vanadium oxide nanorolls have for the first time been successfully used as cathode material in a rechargeable lithium battery. The rolls consist of vanadium oxide sheets arranged in a scroll-like manner. The layers are separated by structure directing templates ( e.g. , primary amines) which can be readily exchanged b…
The oxygen permeation fluxes from to across cobalt-containing perovskite ceramic membranes and were measured by gas chromatography as functions of oxygen chemical potential gradient, temperature, thickness, and catalytic activity on the surface. Power indexes for uncatalyzed and for were obtained when vs. was plotted…