Materials Literature
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Two kinds of aqueous dispersions were prepared from waterborne polyurethane (WPU) and its prepolymer by mixing (M) and grafting (G) with 10 wt % casein, respectively. The resulting dispersions were characterized by using a rotary viscometer and a particle size distribution meter, indicating that the viscosity, Z avera…
We investigate the influence of local-field effects on the electromagnetic response of a collection of dipoles. We derive the local-field corrected static polarizability for a collection of dipoles in the case of a scatterer with uniform depolarization. We then use this correction within the discrete dipole approximat…
We report crystal-field splitting investigations of ${\mathrm{Gd}}^{3+}{(4f}^{7})$ energy levels determined from high resolution energy (Stark) level cathodoluminescence (CL) spectroscopy of Gd-implanted 2H-aluminum nitride (AlN) in the wavelength range 250 to 320 nm and at temperatures 12, 77, and 300 K. The CL spect…
Abstract Eine Vielzahl von theoretischen Untersuchungen und Experimenten zeigt, dass gelöste Dendrimere sich wie flexible Polymere in guten Lösungsmitteln verhalten und daher am besten als Makromoleküle mit einem dichten Kern und fluktuierenden Monomerbausteinen beschrieben werden. Wir zeigen hier mithilfe von analyti…
The present work describes a new way to synthesize manganese species within the channels of mesoporous MCM-48 silica using permanganate as manganese precursor agent. For the first time permanganate ions were incorporated within the as-synthesized mesoporous host by ion-exchange process. The resulting materials were ch…
CdS nanoparticles with surfaces modified by mercaptoethanol have been synthesized for greater solubility in dimethylformamide (DMF) and the ability to preferentially bind to the poly(ethylene oxide) (PEO) blocks of polystyrene- block -poly(ethylene oxide) (PS- b -PEO) copolymer. The size of the surface-modified CdS na…
Adding to the confusion: [3+2] coupling of confused tripyrrane and confused dipyrromethane dicarbinol, followed by oxidation, results in the synthesis of meso-pentafluorophenyl-substituted, doubly N-confused, oxo-substituted pentaphyrins (see X-ray crystal structure; green: F, blue: N, red: O). The oxopyrrole moieties…
We report here the synthesis of (TiO 2 ) x (Al 2 O 3 ) 1 - x nanopowders with molar ratios that span the TiO 2 −Al 2 O 3 composition range. The nanopowders were synthesized using liquid-feed flame spray pyrolysis (LF−FSP) of mixtures of N(CH 2 CH 2 O) 3 TiOiPr (titanatrane isopropoxide) and N(CH 2 CH 2 O) 3 Al (alumat…
Pseudomonas aeruginosa alcohol dehydrogenase (PaADH; ADH, EC 1.1.1.1) catalyzes the reversible oxidation of primary and secondary alcohols to the corresponding aldehydes and ketones, using NAD as coenzyme. We crystallized the ternary complex of PaADH with its coenzyme and a substrate molecule and determined its struct…
Stimmig: Ein Material, das eine Valenztautomerisierung eingeht, wurde durch das Abstimmen der elektronischen Eigenschaften eines zweikernigen Cobalt-Polyoxolen-Komplexes (schematisch gezeigt) erhalten, der ein dreiwertiges Metallion als Hilfspartner enthält. Die thermisch oder durch Licht induzierbare Tautomerisierung…
Abstract In this comparative study, the effect of carbon black (CB) on the thermal ageing characteristics of poly(ethylene‐co‐vinyl acetate) (EVA) was investigated. EVA, containing 13% vinyl acetate (VA), and poly(ethylene‐co‐vinyl acetate)/carbon black mixture (EVA/CB) containing 13% VA and 1% CB were aged at 85°C in…
Scanning tunneling microscopy (STM) and optical spectroscopy measurements were performed on InAs nanorods 7 to 25 nm long. Both methods reveal a clear dependence of the band-gap on length, with a red shift for longer rods. This (zero-dimension like) behavior is different than that of CdSe rods, where the band-gap is n…
Abstract Blends of poly( ε ‐caprolactone) (PCL) with zein (PCL/zein) in different proportions (100/0, 75/25, 50/50, 25/75 and 0/100 wt% containing 5 wt% glycerol) were compared based on their mechanical properties (tensile strength, elongation at break, and Young's modulus), and on their thermal properties, the latter…
Two PcSn(IV) dicarboxylate molecules were obtained through efficient microwave methodology with the aim to test them as corrosion inhibitors in the oil industry. The compounds were characterized by elemental analysis, IR, UV-vis, (1)H, (13)C NMR, and X-ray diffraction. The relative configuration of the two carboxylate…
Third-generation dendrimers have been used to enable the synthesis and isolation of a series of spatially isolated, discrete conjugated wires G3-n (where n is the number of repeating monomer units, see schematic representation), including 147-nm long G3-64, which contains 192 aromatic rings and 256 triple bonds in the…
Stereoregular polymerization of ( N - n -octyl-3-carbazoyl)acetylene was successfully performed with a [Rh(NBD)Cl] 2 (NBD = norbornadiene) catalyst to afford poly( N - n -octyl-3-carbazoyl)acetylene (PNOCzA) as a new type of possible electron-transporting polymer in fairly high yields when triethylamine, chloroform, o…
Abstract The conversion of poly(amic acid) into polyimide (PI) was achieved with far‐infrared radiation (FIR) and conventional thermal treatments. The structure and properties of PI films during different stages of imidization were studied with Fourier transform infrared spectroscopy, weight‐loss analysis during imidi…
We present a universal relation for crack surface cohesion including surface relaxation. Specifically, we analyze how N atomic planes respond to an opening displacement at its boundary, producing structurally relaxed surfaces. Via density-functional theory, we verify universality for metals (Al), ceramics $(\ensuremat…
Reaction of bis(trimethoxysilyl)hexane, (CH 3 O) 3 Si(CH 2 ) 6 Si(OCH 3 ) 3, and the protonated salt of 3-aminopropyltriethoxysilane, (C 2 H 5 O) 3 Si(CH 2 ) 3 NH 3 + Cl -, with different clay aqueous colloidal dispersions produces a network of clay platelets cross-linked on their edges by the corresponding organosilo…
Neutron scattering studies of single crystal LiNiPO4 reveal a spontaneous first-order commensurate-incommensurate magnetic phase transition. Short- and long-range incommensurate phases are intermediate between the high temperature paramagnetic and the low temperature antiferromagnetic phases. The modulated structure h…