Materials Literature
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The interaction of CO molecules with a model catalyst system formed by alumina-supported vanadia particles was studied utilizing infrared (IR) spectroscopy. A thin, well-ordered alumina film grown on the NiAl(110) alloy surface was used as a support oxide. The structural characterization of this model system has been…
The conformational behavior and magnetic properties of the α-acetylamino, N ‘-methylamide derivative of TOAC (4-amino-2,2,6.6-tetramethylpiperidine-1-oxyl-4-carboxylic acid) have been investigated in vacuo and in aqueous solution by an integrated computational approach including density functional, post-Hartree−Fock,…
A diaphragm-type film specimen was used to study in vitro degradation of poly(etherurethane urea) (PEUU) under conditions of dynamic loading. This geometry allowed both uniaxial and biaxial loading in a single experiment. During testing, the film was exposed to a H(2)O(2)/CoCl(2) solution that simulated in vivo oxidat…
Abstract There is a dramatic loss in the mechanical performances at the end of the first life application of bumpers made by a poly(propylene) matrix (PP) and an ethylene‐propylene rubber copolymer as dispersed phase. The use of specific additives during the recycling strongly enhances the mechanical properties of the…
Abstract A new powerful synthesis of symmetrical (two‐step) or dissymmetrical (three‐step) macrotricyclic cyclen‐ or cyclam‐based ligands is reported. In this procedure, the starting materials are bis‐aminals derived from condensation of cyclen or cyclam with glyoxal. The two macrocyclic subunits are linked by two aro…
In a stepwise noncovalent multiple-interaction strategy, copper(II) salts were complexed with the sodium salts of bathophenanthrolinedisulfonic acid (BPS) and bathocuproinedisulfonic acid (BCS), and organized into nanostructured materials by the addition of ammonium surfactants by means of the ionic self-assembly (ISA…
For the design of multicompositional materials with a spatially defined order of different components symmetric polystyrene(deuterated)- block -polybuthyl methacrylate P(Sd- b -BMA) lamellar thin films are used as a structure-directing matrix for the nanoparticle arrangement. A P(Sd- b -BMA) diblock-copolymer film spo…
A novel electrochemical deposition method has been used for coating Ni onto well-aligned multiwall carbon nanotubes. Both synthesis of carbon nanotubes and deposition of Ni are processed in porous anodic aluminum oxide (AAO) templates. The design of the AAO pores allows us easily to control the size of nanotubes and t…
Abstract The tensile deformation of materials with Poisson's ratio smaller than 0.5 generates an additional free volume, which means that tensile creep under constant stress and temperature is a non‐iso‐free volume process. Fractional free volume rising proportionally to the creep strain accounts for a continuous shor…
Abstract A novel series of photocrosslinkable biodegradable polymers was prepared by a high‐temperature solution polycondensation from a dichloride of 4,4′‐(adipoyldioxy)dicinnamic acid (CAC) and alkane diols of various methylene lengths (HO(CH 2 ) n OH; n = 6–10) or poly(ethylene glycol)s (PEG) of various molecular w…
2,2'-[2,2-Bis(4-dimethylaminophenyl)ethenyl]biphenyl (1) is a strong electron donor that undergoes oxidative C-C bond formation to give a stable dication rac-2(2+), the 9,10-dihydrophenanthrene derivative substituted with two bis(4-dimethylaminophenyl)methylium chromophores. This dication salt regenerates the starting…
Composites of conjugated polymers poly(2-methoxy-5-(2‘-ethyl-hexyloxy)- p -phenylene vinylene) (MEH-PPV) and poly(2,3-diphenyl)phenylene vinylene) (DP-PPV) adsorbed to porous alumina (PA) membranes have been prepared. Time-integrated and time-resolved optical emission properties of these materials at 77 K have been st…
The adsorption of reactive dyes on sepiolite has been investigated in a series of batch adsorption experiments. Three reactive dyes (Everzol Black B, Everzol Red 3BS, Everzol Yellow 3RS H/C) were used in bottle adsorption studies. While no significant adsorption capacity was obtained for natural sepiolite, high-adsorp…
A series of Pd IV −(NO x ) complexes ( x = 1, nitrosyl; x = 2, nitro; x = 3, nitrate) has been synthesized. The nitrosyl derivative is the first palladium mononuclear derivative to be structurally characterized by X-ray diffraction methods.
The reaction of Ru(2)(mu-O(2)CMe)(4)Cl with approximately 2.5 equiv of HDAniF (HDAniF = N,N'-di(p-anisyl)formamidine) in refluxing THF resulted in the synthesis of cis-Ru(2)(mu-DAniF)(2)(mu-O(2)CMe)(2)Cl (1). This Ru(2)(5+)complex, which has two labile acetate groups occupying two equatorial cisoid positions, was used…
Electrochemical copolymers of 2,2‘-bis(3,4-ethylenedioxythiophene) (BiEDOT) and 3,6-bis(2-(3,4-ethylenedioxy)thienyl)- N -methylcarbazole (BEDOT− N MeCz) were prepared from nine comonomer solutions of varying concentration. The monomers exhibit low peak oxidation potentials ( E p,m ) that are in close proximity (BiEDO…
A new class of highly luminescent dyes is reported. The characteristic feature of these compounds is that a terpyridine fragment is closely appended to a boradiazaindacene moiety in such a way that cation binding to the vacant terpyridine causes strong perturbations of the photophysical properties of the boradiazainda…
Unusual spin coupling between Mo(III) and Mn(II) cyano-bridged ions in bimetallic molecular magnets based on the [Mo(III)(CN)(7)](4-) heptacyanometalate is analyzed in terms of the superexchange theory. Due to the orbital degeneracy and strong spin-orbit coupling on Mo(III), the ground state of the pentagonal-bipyrami…
Diffraction data from two non-isomorphous crystals (forms 1 and 2) of an artificial protein with a four-helix bundle motif, di-Co(II)-DF1-L13A, have been collected using synchrotron radiation. The phase of form 1 has been assigned using the group and minimal non-isomorphic supergroup relation between the space group o…
The very low temperature properties of two pyrochlore compounds, Yb2Ti2O7 and Gd2Sn2O7, were investigated using an ensemble of microscopic and bulk techniques. In both compounds, a first order transition is evidenced, as well as spin dynamics persisting down to the 20mK range. The transition however has a quite differ…