Materials Literature
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Well-defined cyclic-polymers (cyclic-PAzoMMAs), bearing side-chain phenylazo naphthalene chromophore, were successfully synthesized by the combination of atom transfer radical polymerization (ATRP) and copper(I)-catalyzed azide/alkyne cycloaddition "click" reaction, as verified by GPC, (1) H NMR, FTIR, and MALDI-TOF m…
Alumina-supported manganese catalysts with cryptomelane and/or birnessite structure have been prepared using a simple method based on the thermal decomposition of potassium permanganate. The samples have been characterized by XRD, FTIR, TGA, DSC, N2 adsorption at −196 °C, SEM, H2-TPR and XPS, and their catalytic activ…
Bei Licht Bewegung: GABAA-Rezeptoren sind ligandenkontrollierte Chloridionenkanäle, die auf γ-Aminobuttersäure (GABA) reagieren, dem bedeutendsten inhibierenden Neurotransmitter des Zentralnervensystems bei Säugern. Azobenzolderivate von Propofol, wie Verbindung 1 (siehe Schema), erhöhen GABA-induzierte Ströme in der…
Abstract In this article, a facile route was designed to prepare four new hyperbranched poly(arylene‐ethynylene)s containing azo‐chromophore moieties through one‐pot “A2+B3” approach via simple Sonogashira coupling reaction. The polymers were all soluble in organic solvents and demonstrated good nonlinear optical (NLO…
In this paper, the acetone solvate of candesartan cilexetil was preferentially crystallized from the acetone solution by cooling crystallization and was characterized by combination methods of X-ray powder diffraction (XRPD), 13 C nuclear magnetic resonance (NMR), thermogravimetric analysis/differential scanning calor…
Aqueous solutions of PEO exhibit a lower critical solution temperature (LCST) phase diagram. In this work, phase separation behavior of PEO/water solutions was investigated using small-amplitude oscillatory shear and steady shear rheological measurements. Binodal decomposition temperatures were determined from the sud…
Total ionization cross-sections for C2, C3, Si2, Si3, SiC, SiC2 and Si2C molecules have been calculated by electron impact. Spherical complex optical potential formalism has been employed for obtaining the inelastic cross-sections for these molecules. Then by applying complex scattering potential-ionization contributi…
Three dimensional vibration analysis of multi-layered graphene sheets embedded in polymer matrix is carried out employing nonlocal continuum mechanics. By using the Fourier series expansion in the in-plane axis, the governing equations in term of displacements can be obtained. By exerting the traction free surface bou…
Abstract We report the synthesis, characterization, and solvent‐induced structure formation in thin films of an amphiphilic rod‐coil conjugated block copolymer, poly(3‐hexylthiophene)‐b‐poly(ethylene oxide). The diblock copolymers were prepared by a facile click reaction and their characterizations as well as thermal,…
Summary Physicochemical, binding, antioxidant and antibacterial properties of chitosans prepared from ground and entire crab leg shells were compared. Chitosan prepared from ground shell (designated as g‐chitosan) had significantly higher nitrogen content, degree of deacetylation, solubility and viscosity, but lower a…
The inhibitory effect of linear enantiomers of L- and D-Asp6 on the growth of calcium oxalate monohydrate crystal has been investigated using in situ atomic force microscopy. The inhibitory magnitude of D-Asp6 on the growth of the [00] step on the (010) face is about 10% larger than that of L-Asp6. While no chiral eff…
Efficient delivery of growth factors is one of the great challenges of tissue engineering. Polyelectrolyte multilayer films (PEM) made of biopolymers have recently emerged as an interesting carrier for delivering recombinant human bone morphogenetic protein 2 (rhBMP-2 noted here BMP-2) to cells in a matrix-bound manne…
Nur Ecken und Kanten: Indem man Keimbildung und Anlagerung von Rh-Atomen auf die Ecken und Kanten von Pd-Würfeln beschränkt, können Kern-Rahmen-Nanokristalle mit konkaven Seitenflächen erhalten werden. Die Pd-Kerne wurden anschließend selektiv durch oxidatives Ätzen entfernt, sodass würfelförmige Rh-Nanorahmen mit aus…
Using high-resolution, synchrotron-based powder X-ray diffraction (XRD), we have studied the high-pressure behavior of the anatase phase of nanocrystalline TiO 2 (nc-TiO 2 ) under hydrostatic conditions. We find that for anatase with a grain size larger than ∼40 nm, the room-pressure bulk modulus K 0 remains constant…
Recently, an increasing interest in pH-sensitive textiles is recognized. These chromic textiles can be used as flexible sensors for various applications. The aim of the current research is to develop textile pH-sensors through the application of pH-sensitive dyes on various textile materials using different techniques…
Multistabilität wird bei einem Metall-organischen Gerüstmaterial beobachtet, das einen einzigartigen dreistufigen Spin-Crossover mit einer thermischen Hysterese von 20 K eingeht (siehe Bild). Der stufenweise Übergang ist mit einer dreistufigen Strukturänderung gekoppelt, die vier spezifische Strukturzustände definiert…
Four new oxyselenides with nominal formula Sr(2)AO(2)M(2)Se(2) (A=Co, Mn; M=Cu, Ag) have been synthesized. They all crystallize in an I4/mmm space group and consist of alternating perovskite-like (Sr(2)AO(2))(2+) blocks and antiflourie (M(2)Se(2))(2-) layers, which are relatively rare layered oxyselenides reported so…
Abstract The design of paper products based on copper nanoparticles (NPs) is a challenge because of the intrinsic propensity of Cu to oxidize in contact with air. Here, a comparative study on the growth and chemical stability of Cu NPs in vegetable and bacterial cellulose is described for the first time. Furthermore,…
The endoskeletal structure of the Sea Urchin, Centrostephanus rodgersii, has numerous long spines whose known functions include locomotion, sensing, and protection against predators. These spines have a remarkable internal microstructure and are made of single-crystal calcite. A finite-element model of the spine's uni…
Controlling the morphology of supramolecular nanostructures in response to external stimuli is an important challenge in the development of functional soft materials. Here we show that a morphological transformation from 2D nanosheets to a network of 1D nanofibers is triggered by heating, which induces molecular conve…