Materials Literature
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Dynamics of a polydisperse 3D dry foam was experimentally investigated by means of a novel nondestructive method, more precisely by optical tomography associated to a foam reconstruction algorithm. The foam coarsening law obeys to a 3D extension of the classical von Neumann coarsening law of 2D foams. It is obtained a…
Quantum beats due to coherently prepared acoustic vibrational modes have been observed for 14 to 17 nm diameter Au particles. The beat frequency is inversely proportional to the particle size. The dephasing time is ca. 15 ps, which is limited by the broad size distribution (±2 nm) of the samples.
Using an effective Hamiltonian parametrized from first principles, Monte Carlo simulations are performed in order to study the piezoelectric response of BaTiO3 in the ferroelectric tetragonal phase as a function of temperature. The effect of an electric field on the phase behavior is also illustrated by a simulation o…
In this work, we examine in detail the structure and dynamics of the face-centered cubic (100) and (111) crystal–melt interfaces for systems consisting of approximately 104 hard spheres using molecular dynamics simulation. A detailed analysis of the data is performed to calculate density, pressure, and stress profiles…
Electron loss and electron-induced photon-emission probabilities are calculated near arbitrarily shaped dielectrics described by frequency-dependent response functions. The exact solution of Maxwell's equations is reduced to self-consistent equations involving integrals over the interfaces. The particular case of axia…
By analyzing the vibrational eigenmodes of a model structure obtained previously by quantum molecular dynamics, the two sharp features appearing in the Raman spectrum of vitreous silica could conclusively be assigned to three- and four-membered ring structures embedded in the network. The projections of the eigenmodes…
Six steels were obtained from excavations of in-service gas transmission pipelines, and subjected to hydrogen charging by electrochemical means. The aim was to assess the susceptibility to hydrogen damage of these materials, which were not expected to encounter hydrogen-containing environments when they were originall…
The radical polymerization of the three kinds of fluorine-containing maleimides, that is, N-[2-(trifluoromethyl)phenyl]maleimide (2TFPhMI), N-[3-(trifluoromethyl)phenyl]maleimide (3TFPhMI), and N-[4-(trifluoromethyl)phenyl]maleimide (4TFPhMI) was carried out in the presence of a radical initiator in benzene at 60°C. T…
A novel thermotropic side-chain liquid crystalline ionomer (LCI) containing sulfonic acid groups on the side-chain was synthesized by graft copolymerization of mesogenic monomer 4-allyloxy-benzoxy-4′-methoxyphenyl (ABM) and nonemesogenic monomer 4-allyloxy-azobenzene sulfonic acid (AABS) upon polymethylhydrosiloxane (…
Rare earth metal ions containing polymer ternary complexes were synthesized and characterized. The functional polymers investigated were polymer-bond triphenylphosphine (PBDP), polymer-bond triphenylarsine (PBDAs), polymer-bond triphenylstibine (PBDSb), and polymer-bond triphenylbismuthine (PBDBi) as polymer ligands.…
Graft copolymerization of methacrylic acid (MAA) onto starch using a potassium persulfate/sodium thiosulfate redox initiation system was investigated. Emphasis was placed on the promotion of graft formation while minimizing homopolymerization. This could be achieved through a thorough investigation into the major fact…
Microporous polypropylene sheets are prepared by biaxially stretching polypropylene sheets containing CaCO3 filler. Here, the stretching ratio is one of the most important factors in the preparative process, and removing the CaCO3 filler also affects the sheet properties. Their effects were studied in relation to the…
Microporous polypropylene sheets are prepared by biaxially stretching polypropylene sheets containing CaCO3 filler. Here, the stretching ratio is one of the most important factors in the preparative process, and removing the CaCO3 filler also affects the sheet properties. Their effects were studied in relation to the…
Styrene–maleic anhydride (SMA) copolymers containing either 7 or 14% maleic anhydride were filled with either pine flour or dry-process aspen fiber from a medium density fiberboard (MDF) plant. Material properties of the filled and unfilled SMA plastics were compared with those of aspen-fiber-filled and unfilled polys…
Measurements of nonspecular EUV scattering from Mo/Si multilayer coated mirrors have been performed. The surface power spectral density is deduced from the angular scattering distribution and in all cases is found to be in excellent agreement with surface profile measurements, by both optical and atomic force microsco…
Je 32 Carboxylat- und Ammonium-Funktionalitäten ermöglichen die elektrostatische Wechselwirkung zwischen unterschiedlich geladenen dendritischen Elektrolyten und Porphyrinkernen, die in protischen Medien zu einem supramolekularen, fluoreszenzaktiven Aggregat mit vorausbestimmbarer Anordnung zweier kommunizierender Chr…
A new generation of nonionic surfactants that are widely applicable and simultaneously ecologically compatible has been developed in the alkyl polyglycosides. Their production from the renewable resources glucose and fatty alcohol and their ultimate biodegradation into carbon dioxide, water, and assimilated bacterial…
The surprising accessibility of the title compound has enabled the first X-ray structural analysis of the hydrogen peroxocarbonate anion (shown on the right).
Four different poly(ethylene oxide) [PEO] molecules were compared as grafted polymer layers for biomaterials' substrates: two linear polymers and two star polymers. Conditions maximizing surface coverage for each molecule were employed with the aim of inhibiting protein adsorption and increasing the density of end gro…
1-Heptanol flow in irregularly shaped surface grooves in Pd-coated Cu is shown to be an example of Poiseuille flow with simple Washburn kinetics of the form z 2 = C (γ/μ) t, where γ is the liquid surface tension, μ is the viscosity, and C is a function of the groove dimensions and the contact angle θ. A shape independ…