Materials Literature
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Durch Selbstorganisation bilden Blockcopolymere eine Vielzahl von Überstrukturen mit charakteristischen Abmessungen im Bereich von wenigen Nanometern bis hin zu mehreren Mikrometern. Durch das Zusammenspiel von Supramolekularer Physik und Chemie ergeben sich dabei neue Ansatzpunkte, anorganische, organische und biolog…
The fundamental mechanisms of the deformation of heavily deformed multiphase materials are not clearly understood despite the vast literature and the amount of data on this subject. This paper presents a new plastic flow mechanism observed by in-situ transmission electron microscopy deformation on Cu-Nb continuous mul…
The slip behaviour in coherent and semicoherent metallic bilayer composites is examined by atomic simulation in the Cu/Ni and Cu/Ag systems. The coherent interface in Cu/Ni, although energetically unfavourable relative to the semicoherent interface in thick layers, reveals several interesting phenomena. Linear elastic…
Fabrication and applications are discussed for a visible-wavelength micropolarizer array consisting of a linear polarizer and a micropatterned liquid-crystal (LC) cell. LC alignment direction is controlled by means of depositing an optically transparent gold film at an oblique angle and coating the surface with an alk…
This work deals with the comparison of two identification procedures of Scalar and Vector Preisach Model. The first one is to assume a Preisach function and determine the different parameters with the knowledge of the remanence and the coercivity. The second one is to measure the Everett function directly.
The reaction of α-[P2W15O56]12− with divalent cations M2+ leads to sandwich complexes of the formula [M4(H2O)2(P2W15O56)2]16− (M4P4W30) where M = MnII, CoII, NiII, CuII, ZnII, or CdII. An FeIII tetranuclear sandwich complex has also been obtained. Full details are reported concerning procedures by which the pure sandw…
Three new single end-to-end azido-bridged copper(II) chains [Cu(L1)(N3)]n(ClO4)n (1), [Cu(L2)(N3)]n(ClO4)n (2), and [Cu(L3)(N3)]n(ClO4)n (3) using three different tridentate Schiff bases L1, L2, and L3, obtained from condensation of pyridine-2-carbaldehyde with N,N-dimethylethane-1,2-diamine, N,N-diethylethane-1,2-dia…
This paper demonstrates the field model and time domain calculating methods and some of their important applications, helping advance an understanding of the complicated charge accumulation phenomena and its effect on the dielectric strength of a HVDC SF/sub 6/ insulation system.
A helix that expands on cooling: The crystal structure of TrpGly⋅H2O consists of helical peptide nanotubes extending throughout the crystal. The thermal expansion is negative in the helical direction (see graph; a axis: red, c axis: blue). This effect is believed to be linked to the increasing order of water molecules…
Hyperbranched aliphatic copolyesters have been prepared by copolymerization of ε-caprolactone with 2,2-bis(hydroxymethyl)butyric acid, catalyzed by immobilized Lipase B from Candida antarctica (Novozyme 435) under mild conditions. Via this novel combination of ring-opening AB polymerization and AB2 polycondensation, t…
Abstract High-resolution gas adsorption techniques were used to analyse the evolution of the aspect ratio and adsorption energy distribution on synthetic saponite samples with increasing layer charge. Using Ar as a gaseous probe, the aspect ratio of the saponite particles can be determined easily by decomposing the de…
Results are presented on the thermal and chemical characteristics of flames using high-temperature combustion air and liquified petroleum gas (LPG) as the fuel. The stability limits of these flames are extremely wide as compared to any other method of flame stabilization. This study is part of the Japan national proje…
The synthesis of double-hydrophilic block copolymers with a poly(ethylene glycol) block (PEG) and a block with pendant monophosphate ester groups based on a hydroxylated polybutadiene block (poly[2-(2-hydroxy ethyl)ethylene] (PHEE) with variable degrees of phosphate substitution (up to 40%) is described. It is shown t…
The electronic structure and bonding in a series of unligated and ligated FeII porphyrins (FeP) are investigated by density functional theory (DFT). All the unligated four-coordinate iron porphyrins have a A2g3 ground state that arises from the (dxy)2(dz2)2(dπ)2 configuration. The calculations confirm experimental res…
The thermolysis of 2,4,6-[(CH3)2N]3B3N3H3 (1), 2,4-[(CH3)2N]2-6-(CH3HN)B3N3H3 (2), and 2-[(CH3)2N]-4,6-(CH3HN)2B3-N3H3 (3) led to polyborazines 4, 5, and 6 respectively. The polymers display direct B–N bonds between borazinic B3N3 rings and, in addition, a proportion of –N(CH3)– bridges for 5 and 6, as clearly underli…
A theoretical analysis of nanoscale pore formation during anodization reveals its fundamental instability mechanism to be a field focusing phenomenon when perturbations on the minima of the two oxide interfaces are in phase. Lateral leakage of the layer potential at high wave number introduces a layer tension effect t…
A method to model dynamic hysteresis is proposed. The proposed model is based on an inverse Preisach model with the magnetic flux density and its rate as inputs, and the magnetic field as the output. Assuming that the hysteretic behavior does not depend on the history of this rate, the inverse distribution function is…
Controlled‐geometry cavities were introduced into the m{100} plane of undoped sapphire substrates using photolithographic methods, and subsequently internalized by diffusion bonding the etched sapphire to an undoped high‐purity polycrystalline alumina. Pore‐boundary separation during growth of the sapphire seed into t…
RATIONALE AND OBJECTIVES: This cooperative multicenter human study was designed to evaluate the safety, magnetic resonance (MR) imaging characteristics, and clinical response to a single gadolinium contrast agent: gadopentetate dimeglumine. MATERIAL AND METHODS: Ninety-five patients (age range: 1 month to 78 years; se…
The stylus of an atomic force microscope is used to scribe preferred directions for liquid-crystal alignment on a polyimide-coated substrate. The opposing substrate that comprises the liquid-crystal cell is rubbed unidirectionally, resulting in a twisted nematic structure associated with each micrometer-sized pixel. T…