Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDyeing CrystalsBart Kahr and Richard W. GurneyView Author Information Department of Chemistry, University of Washington, Box 351700, Seattle Washington 98195-1700 Cite this: Chem. Rev. 2001, 101, 4, 893–952Publication Date (Web):March 27, 2001Publication History Received8 Ju…
A comprehensive investigation of ultrasonic frequency and its role in sonochemical activity and sonoluminescence (SL) has been performed. SL spectra and intensity were examined at four frequencies (205, 358, 618, and 1071 kHz) and in the presence of varying argon and oxygen saturation ratios. A series of high-energy r…
Transparent nanostructured NiO electrodes have been prepared by heating Ni(OH) 2 sol−gel films at a temperature of 300−320 °C. Nanostructured NiO (bunsenite) behaves as a p-type semiconductor and has an indirect band gap of 3.55 eV. It shows a strong anodic electrochromic effect, as it changes color from transparent t…
Abstract In this article, sulfonated ethylene‐propylene‐diene monomer terpolymer (H–SEPDM) was used to treat CaCO 3 particles. CaCO 3 particles are encapsulated by H–SEPDM through the reaction of sulfonic acid group (SO 3 H) in H–SEPDM with CaCO 3 to improve the interface adhesion of CaCO 3 with HDPE. In case the tre…
Abstract In this article, flexible nylon 6,6 was reinforced with rigid‐chain aromatic polyamides based on poly(4,4′‐diphenylsulfone terephthalamide) (PSA), poly( p ‐diphenyl oxide terephthalamide) (POA), poly( p ‐diphenylmethane terephthalamide) (PMA), and isophthaloyl chloride (IPC). Various high molecular weight blo…
Abstract Pyrophosphoric lactone‐modified polyester containing two phosphorous functional groups in one structural unit of base resin was synthesized to prepare a nontoxic, reactive flame‐retardant coatings. Then, the pyrophosphoric lactone‐modified polyester was cured at room temperature with isocyanate and isophorone…
In the present letter, we have identified anomalous transport patterns on conducting polymer thin-film electrodes [poly(thiophene-3-acetic acid)] by means of electrochemical impedance measurements. This type of electrical behavior yields conductance responses exhibiting frequency dispersion at frequencies in excess of…
Abstract The wavenumbers of the Raman bands of ethylene adsorbed on Cu in ultra‐high vacuum depend on the surface structure of the copper substrate. Thus it is possible to differentiate between ethylene adsorbed at Cu(110) sites, Cu(111) sites and surface defect sites of unknown configuration. These latter are the ‘SE…
The temporal behavior of ferroelectric domains under external electric field is investigated in cerium-doped strontium-barium-niobate crystals using quasistatic surface-charge detection. The polarization reversal depends strongly on frequency, temperature, dark conductivity, and doping concentration. This so-called el…
Abstract Post‐use high‐density polyethylene, almost devoid of any stabilizing agents, was restabilized in various degrees and subjected to multiple extrusion cycles at different reprocessing temperatures for assessing its chemical stability. The process‐induced material degradation was attributed primarily to long‐cha…
Homogeneous semiconductors exhibit spin-band splitting and displacements under spatially periodic external magnetic fields, which are more clearly defined than in diluted magnetic semiconductor superlattices. We study the influence of the geometrical parameters and the spin-field interaction on the electronic transpor…
The room-temperature epitaxial growth of CeO2 films on Si(111) substrates was examined in situ by combined use of a coaxial impact-collision ion scattering spectroscopy (CAICISS) and the laser molecular beam epitaxy (laser MBE). It was found that the crystal quality of CeO2 ultrathin films (∼3 nm thick) as-grown in UH…
Abstract Porous poly(ϵ‐caprolactone) (PCL) films were prepared by water extraction of poly(ethylene oxide) (PEO) from their solution‐cast phase‐separated blend films and the dependence of their blend ratio [ X PCL = PCL/(PEO + PCL)] and molecular weight of PEO on the porosity, pore size, crystallinity, crystalline thi…
Abstract The thermal degradation of poly(3‐hydroxybutyrate) (PHB) and poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) [P(HB‐HV)] was studied using thermogravimetry (TG). In the thermal degradation of PHB, the temperature at the onset of weight loss ( T o ) was derived by T o = 0.97 B + 259, where B represents the heati…
The nature of freezing and melting transitions for a system of hard disks in a spatially periodic external potential is studied using extensive Monte Carlo simulations. Detailed finite size scaling analysis of various thermodynamic quantities like the order parameter, its cumulants, etc., are used to map the phase dia…
We have studied the compositional dependence of the layered structure of ${\mathrm{Bi}}_{1+x}{\mathrm{Te}}_{1\ensuremath{-}x}$ thin films and its relation with the transport properties. We have observed that the ${\mathrm{Bi}}_{1+x}{\mathrm{Te}}_{1\ensuremath{-}x}$ films have a stable structure near the ${\mathrm{Bi}}…
The effect of large amplitude oscillatory shear on two-dimensional stripe patterns formed by block copolymers was investigated using cell dynamics simulations. A global orientational order parameter S and a correlation function for stripe normals G(r-r(')) were used to characterize the degree of stripe orientation und…
Abstract The graft copolymerization of acrylic acid (AA) and 2‐acrylamido 2‐methylpropane sulfonic acid (AASO 3 H) onto cellulose, in the presence or absence of crosslinking agent N,N ′‐methylene bisacrylamide (NMBA), by using different concentrations of ceric ammonium nitrate (CAN) initiator in aqueous nitric acid so…
We demonstrate a method for laterally patterning metal nanocrystal monolayers. Extended monolayers are first self-assembled onto a solid substrate. Direct electron-beam exposure is then used to strip the dodecanethiol ligand coating from the nanocrystal cores, enabling the cores to stick to the underlying substrate. D…
The effect of hydrogen passivation on the photoluminescence from Si nanocrystals prepared in SiO2 by ion implantation and annealing is examined as a function of nanocrystal size (implant fluence). Passivation is shown to produce a significant increase in emission intensities as well as a redshift of spectra, both of w…