Materials Literature
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Velocity focusing of electrons is combined with photoelectron photoion coincidence (PEPICO) spectroscopy to achieve a true threshold PEPICO signal without contributions from energetic electrons. Ions are generated by a continuous vacuum ultraviolet light source. Electrons, extracted by a field of 20 V/cm, pass through…
The electrogenerated chemiluminescence (ECL) spectrum of CdSe/ZnSe nanocrystals (NCs) dispersed in a CH 2 Cl 2 solution containing 0.1 M TBAP was obtained by stepping the potential between +2.3 and −2.3 V. Unlike the spectra from the ECL of Si or CdSe NCs, where the emission occurs in a single peak that is significant…
The effects of different poly(ethylene glycol) (PEG) attachment strategies upon the adhesion of a Gram-negative bacteria ( Pseudomonas sp.) was tested. PEG was covalently immobilized, at the lower critical solution temperature of PEG, to a layer of branched poly(ethylenimine) (PEI). PEI was both physically adsorbed to…
We have synthesized monodisperse Pd nanoparticles with particle sizes of 3.5, 5, and 7 nm from the thermal decomposition of a Pd−surfactant complex. The particle size of Pd nanoparticles was controlled by varying the concentration of stabilizing surfactant.
We report a joint experimental and theoretical study of the electronic and atomic structures of small gold clusters with up to 14 atoms. Well-resolved photoelectron spectra were obtained for Au N - ( N = 1−14) at several photon energies. Even−odd alternations were observed, where the even-sized clusters (except Au 10…
The structure of the T(6) hexameric form of human insulin has been determined at both room temperature and 100 K from a single air-dried crystal. At 100 K, the space group is R3 and the asymmetric unit consists of a dimer, as has been observed previously in hydrated structures. At room temperature, the space group is…
LMO4 is the most recently discovered member of a small family of nuclear transcriptional regulators that are important for both normal development and disease processes. LMO4 is comprised primarily of two tandemly repeated LIM domains and interacts with the ubiquitous nuclear adaptor protein ldb1. This interaction is…
Abstract Divalent samarocene complex [(C 5 H 9 C 5 H 4 ) 2 Sm(tetrahydrofuran) 2 ] was prepared and characterized and used to catalyze the ring‐opening polymerization of L ‐lactide (L‐LA) and copolymerization of L‐LA with caprolactone (CL). Several factors affecting monomer conversion and molecular weight of polymer,…
Abstract Human dental calculi are biological calcium phosphates, which consist of an organic phase and an inorganic or mineral phase. In the latter phase, spectrochemical analyses have revealed the presence of several different magnesium and calcium phosphates. As the crystalline structure of the calculus passes throu…
Abstract A series of fluorosilicone (FLS) homopolymers with 4,4,5,5,6,6,7,7,8,8, 9,9,10,10,11,11,11‐heptadecafluoroundecylmethylsiloxane [C 8 F 17 CH 2 CH 2 CH 2 (CH 3 ) SiO; HDFUSiO] and copolymers based on dimethylsiloxane [(CH 3 ) 2 SiO] were prepared by the hydrosilylation of 4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,1…
Syndiotactic polypropylene (sPP) exhibits a complex crystalline morphology, characterized by unique annealing- and deformation-induced changes. Rheooptical FTIR spectroscopy, wide-angle X-ray diffraction (WAXD), and Raman spectroscopy are used to characterize morphology and orientation responses of highly syndiotactic…
The strengths of intermolecular contacts (macrobonds) and the areas occupied by each contact on the molecular surface were estimated in four polymorphic modifications of lysozyme crystals based on the bond strengths between individual atomic pairs belonging to the molecules in contact. It has been shown that the perio…
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…