Materials Literature
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Azobenzene polymer thin films are known to spontaneously generate surface patterns in response to incident light gradients. This peculiar process is investigated in terms of the dynamics of the various azobenzene photomotions, which occur on different length scales. In particular, the formation and thermal erasure of…
The layer-by-layer buildup of chitosan/hyaluronan (CH/HA) and poly(l-lysine)/hyaluronan (PLL/HA) multilayers was followed on a quartz crystal resonator (QCR) in different ionic strengths and at different temperatures. These polyelectrolytes were chosen to demonstrate the method whereby useful information is retrieved…
Nematic liquid crystals confined in a cylindrical capillary and subjected to strong homeotropic anchoring conditions is a long-studied fundamental problem that uniquely incorporates nonlinearity, topological stability, defects, and texture physics. The observed and predicted textures that continue to be investigated i…
Poly(vinyl acetate) (PVAc)/silicate nanocomposites have been prepared using a novel surfactant-free method comprising a copolymer of 2-(acryloxyethyl)trimethylammonium chloride (AETMC) and vinyl acetate (VAc) as the modifier for layered silicates. The nanocomposites maintained the exfoliated morphology even at silicat…
Liquid-crystalline (LC) phase behavior and photoinduction of optical anisotropy in the ionic self-assembly complex 4-(4-diethylaminophenylazo) benzenesulfonate-dimethyldidodecylammonium $(\mathrm{EO}\text{\ensuremath{-}}{\mathrm{C}}_{12}\mathrm{D})$ has been investigated by polarized light microscopy, differential sca…
Experiments have shown that thermal stability of nanoscale titania is significantly enhanced by the presence of low concentration yttrium dopants, but the mechanism of this effect is unclear. We present extended x-ray fine structure and wide-angle x-ray scattering measurements showing that yttrium is not incorporated…
A new approach for the preparation of a biochip on porous silicon and the application of the biochip for detection of small molecule-protein interactions with desorption/ionization on porous silicon (DIOS) was demonstrated. The galvanostatically etched porous silicon substrates were chemically modified firstly to yiel…
Einmal durchgezappt: Stabile Lösungen eines palladiumkomplexierten Dipeptids gelieren nach einer kurzen Ultraschallbehandlung. Das ist der erste Fall eines reversiblen, ferngesteuerten und schnellen Sol-Gel-Übergangs bei wasserstoffverbrückten Aggregaten. Über die Dauer der Beschallung lassen sich die Gelierungsgeschw…
A chloride-centered hexanuclear copper(II) pyrazolate [Au(PPh3)2][trans-Cu6(micro-OH)6[micro-(3,5-CF3)2pz]6Cl] is isolated from the reaction of the trinuclear copper(I) pyrazolate [Cu3[micro-(CF3)2pz]3] with PPh3AuCl and Ph3P in moist air. The six copper atoms are bridged by pyrazolate and hydroxyl ligands, above and…
We report synergetic effects of functionalized mesoporous silica (FMS) and urea to promote favorable protein conformational changes. The specific activity of glucose isomerase (GI) entrapped in FMS in the presence of urea was approximately double that of GI in solution in the absence of urea. Rather than losing all ac…
The first three-connected, 5-fold interpenetrating network based on polyoxometalate building blocks and metal−organic frameworks that represents the highest degree of interpenetration presently known for 3D polyoxometalate systems is reported.
The formation process of novel tungstate-based inorganic−organic hybrid nanobelts/nanotubes with lamellar mesostructures has been investigated, with an emphasis on monitoring the morphological and microstructural changes of the products during the reactions of H 2 W 2 O 7 · x H 2 O ( x = 3.49) with n -alkylamines (C m…
Ein multiferroisches Material: Rb0.82Mn[Fe(CN)6]0.94⋅H2O (siehe Bild; MnII rote Oktaeder, FeIII rote Kugeln, MnIII blaue Oktaeder, FeII blaue Kugeln, CN weiße Linien, Fe-Leerstellen Lücken; H2O weggelassen) ist sowohl ferroelektrisch, vermutlich durch ein Mischen von Fe-Leerstellen und FeII-, FeIII-, MnII- sowie Jahn-…
Liquid crystalline (LC) polymer brushes containing a mesogenic azobenzene (Az) moiety are synthesized on a quartz or silicon substrate by surface-initiated atom transfer radical polymerization. The molecular orientation of the Az units and the LC properties in the grafted chains are evaluated by UV-vis spectroscopy, p…
Sophisticated functional nanostructures could be building blocks for potential future applications. We have prepared hollow silica nanospheres from luminescent semiconductor/silica core/shell nanoparticles. Different synthesis strategies enable various applications of these particles, whereas the progression of the re…
The conversion of protein monomers into fibrils can be determined using the centrifugal filtration method. The results of this method were used to calibrate steady-shear birefringence and Thioflavin T fluorescence measurements. For both measurements, a linear correlation with the fibril concentration was extracted, re…
A two-dimensional model is introduced that describes current sharing between the superconducting and normal metal layers in configuration typical of YBCO-coated conductors. The model is used to compare the effectiveness of surround stabilizer and more conventional one-sided stabilizer. When the resistance of the inter…
An alternative model of the hexagonal boron nitride (h-BN) on nanomesh on the Rh(111) surface is presented. It explains the observed ultraviolet photoelectron spectroscopy spectra and reproduces experimental STM images introducing, instead of two, only one strongly corrugated layer of h-BN covering the whole Rh surfac…
Zap the jello: Stable solutions of a palladium-complexed dipeptide undergo gelation after brief ultrasound irradiation. This is the first case of a reversible, remotely controlled, and rapid sol–gel transition by H-bonding aggregates. By adjusting the sonication time, the gelation rates and heat-resistant properties o…
A biref review is presented on resonant spin Hall effect, where a tiny external electric field induces a saturated spin Hall current in a 2-dimensional electron or hole gas in a perpendicular magnetic field. The phenomenon is attributted to the energy level crossing associated with the spin-orbit coupling and the Zeem…