Materials Literature
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The transport properties of an ionic model for liquid silica [1] at high temperatures and pressure are investigated using molecular dynamics simulations. With increasing pressure, a clear change from “strong” to “fragile” behaviour (according to Angell's classification of glass-forming liquids) is observed, albeit onl…
Although textile composites have been studied for some time, the crushing failure modes and energy absorption data have been limited. In this study, static crushing tests were conducted on 3-D carbon/epoxy and Kevlar/epoxy braided composite square tubes to investigate the failure modes and energy absorption capability…
A sol−gel process is directed toward an electrode surface via electrochemical manipulation of the solubility of trimethoxysilyl group-modified methylene blue in an aqueous environment. The process lasts for 2−3 h and results in electrode derivatization with a polysiloxane network incorporating methylene blue. Cross-li…
The damage produced in the hcp metal α-zirconium at 100 K by displacement cascades with energy in the range from 0.3 to 5keV has been investigated by molecular dynamics using a many-body interatomic potential. Comparisons have been made with the results of a recent study by Wooding et al. of α-titanium, a hcp metal wi…
A new method for the synthesis of sol−gel films of zirconia-containing nanoparticles of CdS is demonstrated. The method consists of dip-coating of the substrate from a preprepared mother solution containing zirconia tetrapropoxide, cadmium acetate, and ammonium thiocyanate and subsequent annealing of the dried film at…
Abstract— Octa‐aL‐alkyloxy‐substituted Zn‐phthalocyanines are an interesting class of far red‐absorbing photosensitizers. The chemical structure, the calculated steric conformation, the observed linear optical properties and an anomalous luminescence from a higher than S, excited state are reported. To study the optic…
ABSTRACT Heat curing of edible whey protein isolate (WPI) films was studied as a means of improving mechanical and water vapor barrier properties. Curing temperature and relative humidity (RH) effects on the rate of change of maximum tensile stress ( TS ), elongation at break ( E ), Young's Modulus ( Y m ), and water…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTriple C−H/N−H Activation by O2 for Molecular Engineering: Heterobifunctionalization of the 19-Electron Redox Catalysts FeICp(arene)Stéphane Rigaut, Marie-Hélène Delville, and Didier AstrucView Author Information Laboratoire de Chimie Organique et Organométallique, UMR…
To gain a better understanding of marine fouling, we have measured the intermolecular forces between two layers of adsorbed extracellular polysaccharides (EPS) on silica. The measurements were made using an atomic force microscope (AFM) with a modified cantilever. Polymer bridging occurred between negatively charged E…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFacile Framework Cleavage Reactions of a Completely Condensed Silsesquioxane FrameworkFrank J. Feher, Daravong Soulivong, and Gregory T. LewisView Author Information Department of Chemistry University of California Irvine, California 92697-2025 Cite this: J. Am. Chem.…
A study of the deep catalytic oxidation of volatile organic compounds (VOCs) contained in air streams on catalytic membrane tubes is presented. The complete combustion of toluene and methyl ethyl ketone as single components and in binary mixtures, with concentrations between 100 and 7000 ppm, was achieved by permeatin…
Five kinds of polythiophenes bearing a crown ethereal subunit directly bonded to the thiophene ring have been prepared by the following organometallic polycondensation: (i) n X−Ar−X + n Ni 0 L m → (̶Ar)̶ n; (ii) a X−Ar−X + b X−Ar‘−X + ( a + b )Ni 0 L m → (̶Ar) a (Ar‘)̶ b, and (iii) n X−Ar−X + n Me 3 Sn−Ar‘−SnMe 3 → (̶…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAn Electrically Conducting Star PolymerFei Wang, R. David Rauh, and Timothy L. RoseView Author Information EIC Laboratories, Inc., 111 Downey Street Norwood, Massachusetts 02062 Cite this: J. Am. Chem. Soc. 1997, 119, 45, 11106–11107Publication Date (Web):November 12,…
Monodisperse silica particles were prepared in microemulsion media using block copolymers and nonionic surfactants. The silica particles were obtained by hydrolysis and condensation of tetraethoxysilane, using NH 3 as a catalyst, and they were characterized by optical and electron microscopy, nitrogen sorption, Fourie…
A nematic liquid crystal confined to a cylindrical capillary with homeotropic anchoring to the sidewalls is considered. An analytic description of the planar polar director field configuration is proposed for arbitrary values of the system material parameters. Conditions for orientational transitions between planar ra…
The interlamellar surface of kaolinite has been modified with molecules possessing amino functionalities. Either the dimethyl sulfoxide intercalate of kaolinite (Kao/DMSO) or the N-methylformamide intercalate of kaolinite (Kao/NMF) were used as starting materials. One of the products, an ethanolamine functionalized ka…
The properties of sol−gel glasses templated with uranyl ions have been investigated. Techniques have been developed to remove the template uranyl ions from silica matrixes to create uranyl-imprinted sol−gel silica glasses. A significant increase in affinity and selectivity of the imprinted sol−gel sorbents over contro…
57 Fe Mössbauer data are presented to show that polycrystalline samples of [Fe(dppen) 2 X 2 ]·2S, where dppen is cis-1,2-bis(diphenylphosphino)ethylene and X - is Cl - or Br - and S is CHCl 3 or CH 2 Cl 2, exhibit the light-induced excited spin state trapping (LIESST) effect. If the sample is kept at 10 K, Ar ion lase…
Several types of additives that contain transition metals can promote the cross-linking of poly(vinyl chloride) (PVC) by a mechanism that apparently involves reductive coupling of the polymer chains. In solid PVC, the cross-linking occurs at 200 °C, and model-compound experiments show that it can be ascribed to the pr…
The incorporation of two brominated compounds/antimony trioxide blends into a PP–PE copolymer were studied. Both brominated trimethylphenyl indane (FR 1808) and poly(pentabromobenzyl acrylate) (FR 1025) confer good flame retardancy at 40% loading. A comparison was made with the incorporation of magnesium hydroxide at…