Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMg−Al Mixed Oxides as Highly Active Acid−Base Catalysts for Cycloaddition of Carbon Dioxide to EpoxidesKazuya Yamaguchi, Kohki Ebitani, Tomoko Yoshida, Hisao Yoshida, and Kiyotomi KanedaView Author Information Department of Chemical Science and Engineering Graduate Sch…
The preparation of ultrahydrophobic and ultralyophobic surfaces using several techniques is described. Plasma polymerization of 2,2,3,3,4,4,4-heptafluorobutyl acrylate on poly(ethylene terephthalate) yields surfaces with water contact angles of θ A /θ R = 174°/173°. Argon plasma etching of polypropylene in the presenc…
Phase separation in nuclear waste glasses has an adverse effect on glass durability. Phase separation in glasses generally takes the form of two immiscible glass phases which differ in chemical composition, density, and surface tension. Usually one phase is more soluble than the other. Phase separation complicates mod…
In studying the avalanches and noise in a model of hysteresis loops we have developed two relatively straightforward algorithms which have allowed us to study large systems efficiently. Our model is the random-field Ising model at zero temperature, with deterministic albeit random dynamics. The first algorithm, implem…
Frequency dependent current noise in ferromagnetic double junctions with Coulomb blockade is studied theoretically in the limit of sequential tunneling. Two different relaxation processes are found in the correlations between spin polarized tunneling currents; low frequency spin fluctuations and high frequency charge…
Handbook of Polyurethanes serves as the first source of information of useful polymers. This new book thoroughly covers the entire spectrum of polyurethanes - from current technology to buyer's information. Discussions include:block and heteroblock systemsrubber plasticitystructure-property relationsmi
Novel types of donor−acceptor (DA) molecules, consisting of covalently linked pyropheophytin−anthraquinone (PQ and ZnPQ) and phytochlorin−anthraquinone (PCQ and ZnPCQ) dyads and their diastereomers were studied by means of steady-state and time-resolved fluorescence and absorption spectroscopies. Conformational proper…
Both first principles pseudopotential calculations and atomistic simulations have been employed to study the MgO{100}/Ag{100} and MgO{110}/Ag{110} interfaces. For both interfaces the most stable structure was determined to be where the Ag atoms are situated above the O2− ion. The binding energy for the {110} interface…
The monomeric ferric hemepeptide from cytochrome c, N -acetylmicroperoxidase-8 (NAcMP8), retains the proximal His ligand and has a coordinated water molecule in the second axial site. It provides an opportunity for quantitatively studying in aqueous solution the coordination chemistry of an iron porphyrin with a singl…
The collective electronic oscillators method is used to construct an effective Frenkel exciton Hamiltonian for conjugated dendrimers with fractal geometry. Self-similarity and the high degree of symmetry utilized by decomposing the space of optical excitations into irreducible representations make it possible to compu…
The segmental dynamics of PMPS chains are determined in the bulk liquid and cross-linked networks of varying cross-link density by broad-band dielectric relaxation spectroscopy. A large fragility index [τ( T g */ T ) dependence], F 1/2 = 0.77, is found, independent of cross-link density, molecular weight, and T g . Al…
To answer the question of which fatty acid residue is the most effective, diacetyltartaric esters of monoglycerides (DATEMs) with fatty acids of chain lengths 6:0-20:0 were synthesized. The activity of synthesized DATEMs and commercial DATEM products was studied by means of rheological methods and a microscale baking…
Electron paramagnetic resonance (EPR) lineshapes of nitroxide spin probes in a variety of organic supercooled liquids and glasses were analyzed within the framework of the fast librational motion model. Computer simulation confirmed that the EPR lineshape may be fitted well by the librational model. For all systems st…
By means of extensive equilibrium molecular dynamics simulations we have investigated the behavior of the interfacial tension γ of two immiscible symmetrical Lennard-Jones fluids. This quantity is studied as function of reduced temperature T*=kBT/ε in the range 0.6⩽T*⩽3.0. We find that, unlike the monotonic decay obta…
In a comprehensive study of the M 2 S n and M‘S n alkali (M) and alkaline-earth (M‘) polysulfides, the alkali polysulfides K 2 S 2, Na 2 S 3 ·NH 3, and K 2 S 3 have been prepared by reaction of the metal with sulfur in liquid ammonia and subsequent heat treatments. Their Raman spectra have been analyzed in relation to…
A sample of Westvaco carbon was oxidized with ammonium persulfate and both initial and oxidized samples were washed with methanol. The samples were characterized using sorption of nitrogen, Boehm titration, potentiometric titration, IGC, FTIR, TPD, and thermal analysis. Then water adsorption isotherms were measured at…
Hydroxypolycarbonates (HPC) offer to the biomedical area hydroxyl functional polymers not now readily available to bind drugs, proteins, or carbohydrate polymers chemically or via hydrogen bonding to facilitate drug delivery and utility with subsequent biodegradibility to acceptable byproducts. The cyclic carbonate (…
A 1.8 μm diameter poly( N -vinylpyrrolidone)-stabilized polystyrene (PS) latex has been coated with poly(3,4-ethylenedioxythiophene) [PEDOT], an organic conducting polymer which exhibits good environmental stability. Despite its limited solubility, EDOT was successfully polymerized in aqueous solution using iron(III)…
A generalized continuum framework for the theory of solute transport in fluids is proposed and systematically developed. This framework rests on the introduction of a generic force balance for the solute, a balance distinct from the macroscopic momentum balance associated with the mixture. Special forms of such a forc…
The phase behavior of poly(styrene- b -butyl methacrylate), PS- b -PBMA, diblock copolymers was investigated by small-angle neutron scattering (SANS), neutron reflectometry (NR), and rheology. For a symmetrical P(dS- b -nBMA) diblock copolymer a lower critical order transition (LCOT) at 155 °C was found by SANS and rh…