Materials Literature
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We demonstrate fabrication of multidirectional and hierarchical carbon nanotube (CNT) films on diverse substrates, using nanocomposite catalyst films prepared by layer-by-layer (LBL) assembly. CNT density and yield are controlled by the thickness of a montmorillonite clay/poly(dyallyldimethyl ammonium chloride (MTM/PD…
There has been a growing interest in using biofunctionalized magnetic particles for cell isolation. This paper describes the synthesis and characterization of magnetite-polymer (Fe(3)O(4)-poly-ε-caprolactone, magnetite-PCL) microparticles surface functionalized with amino and epoxy groups allowing easy covalent attach…
Nanoporous ZnO powders with high surface-to-mass ratios (SMR) between 15 and 70 m 2 g −1 are synthesized, structurally characterized, and studied by time-resolved photoluminescence (PL). A strong dependence of the recombination dynamics and spectral width on SMR is observed at T = 10 K, and pronounced disorder-induced…
A study of the doping evolution of the magnetic susceptibility and transport properties was performed on Fe1 + δTe1 − xSex (x = 0, 0.22, 0.32, 0.37 and 0.40) single crystals grown by the self-flux method. For x = 0, 0.22 and 0.32 the paramagnetic susceptibility χ(T) in the high-temperature regime can be well fitted wi…
Two manganese(II) isocyanate complexes with different flexible zwitterionic dicarboxylate ligands, [Mn(2)(bcpp)(NCO)(4)](n) (1; bcpp=1,3-bis(N-carboxylatomethyl-4-pyridinio)propane) and [Mn(2)(bcp)(NCO)(4)](n) (2; bcp=bis(N-carboxylatomethyl)-4,4'-bipyridinium, have been synthesized and characterized by X-ray crystall…
Novel polymethacrylate-functionalized octaphenylsilsesquioxanes (OPS) macromonomer was designed and synthesized, which was employed as nanofiller and cross-linker to copolymerize with MMA to produce OPS/PMMA hybrid nanocomposites with OPS contents ranging from 0 to 1.18 mol %. The synthesis route was that, OPS was bro…
The non-local elasticity theory is used to study the buckling behaviour of a nonuniform nanowire with consideration of surface effects. An analytical expression for the calculation of critical buckling load of the nanowire is obtained. In addition, the Rayleigh–Ritz method is used to analyse the influences of surface…
The Escherichia coli dihydroxyacetone (Dha) kinase is an unusual kinase because (i) it uses the phosphoenolpyruvate carbohydrate: phosphotransferase system (PTS) as the source of high-energy phosphate, (ii) the active site is formed by two subunits, and (iii) the substrate is covalently bound to His218(K)* of the DhaK…
Ab initio total energy calculations have been performed to study the phase stability of Gd(2)Ti(2)O(7) and Gd(2)Zr(2)O(7) pyrochlores over the pressure range from 0 to 60 GPa. Both compounds are unstable under pressure, and phase transformations to the defect-cotunnite structure are predicted. The phase transformation…
Traditional forms of cancer therapy, which include chemotherapy, have largely been overhauled due to the significant degree of toxicity they pose to normal, otherwise healthy tissue. It is hoped that the use of biological agents, most of which are endogenously present in the body, will lead to safer treatment outcomes…
Thermodynamic control of crystallization has been achieved to produce stable polymorphs directly by using three-dimensional (3D) nanoconfinement in microemulsions. The theoretical basis for thermodynamic control of crystallization using 3D nanoconfinement is outlined. Our approach leap-frogs the usual metastable polym…
Ab initio calculations based on density functional theory have been performed to determine the relative stabilities and migration of H and He atoms in hcp-Sc. The results show that the formation energy of an interstitial H or He atom is smaller than that of a corresponding substitutional atom. The tetrahedral (T) inte…
The cross-linking process of a complex system was studied at elevated temperature. Partially hydrogenated poly(acrylonitrile- co -1,3-butadiene)/dicumyl peroxide compound was selected as a representative complex polymer/cross-linking agent system. On the basis of the mechanisms of cross-linking reactions, an expressio…
A series of trivalent lanthanide hydroxysulfates, Ln(OH)SO(4), (Ln = Pr through Yb, except radioactive Pm) has been synthesized via hydrothermal methods from Ln(2)(SO(4))(3)·8H(2)O by reaction with aqueous NaOH at 170 °C in Teflon lined Parr steel autoclaves, and were characterized by single crystal X-ray diffraction…
Abstract A model for flow‐enhanced nucleation is presented based on the concept of a polymer melt containing a fixed number of nucleation precursors with a fixed size distribution. Depending on the size, precursors can either be active (i.e. susceptible to nucleation, the characteristic time scale of which is governed…
Zebrafisch mit Schalter: Mithilfe eines fluoreszierenden Reporterpeptids gelingt es, die Photoisomerisierung von Azobenzol in vivo abzubilden (siehe Bild). Daraus folgt, dass photochemische Schalter auf Azobenzolbasis allgemein für die räumlich-zeitliche Kontrolle in lebenden Systemen eingesetzt werden können.
Sehr unsichtbar: Bis(pyrrolopyrrol)-Cyanine sind ausgedehnte Chromophore auf der Basis von Diketopyrrolopyrrolen (siehe allgemeine Struktur). Die Verbindungen zeigen eine sehr hohe, schmalbandige Absorption im Nah-Infrarot(NIR)-Bereich und intensive Fluoreszenz bei 1 μm. Da sie im sichtbaren Bereich fast nicht absorbi…
High-purity and doped ZnTe microstructures were synthesized with a single thermal evaporation method. The morphology of doped ZnTe microstructures shows multilayered periodical structure, which is due to the incorporation of In elements. The PL investigation demonstrated that the pure ZnTe microstructures emit only gr…
This work explores the use of "patchy" polymer brushes to control protein adsorption rates on engineered surfaces and to bind targeted species from protein mixtures with high selectivity but without invoking molecular recognition. The brushes of interest contain embedded cationic "patches" composed of isolated adsorbe…
Abstract The potential of contact angle measurements (CAM) as an analytical tool to characterize surface treatments or modifications is often not fully exploited. Agreeing with Strobel and Lyons, comparing contact angles is often much more reasonable than comparing deduced data like surface energies, because the latte…