Materials Literature
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Abstract Chelation efficiency of stimuli‐responsive poly( N ‐iospropylacrylamide‐ co ‐methyacrylic acid) (PNIPAAm‐MAA) nanoparticles with Cu 2+ ions from CuSO 4 ·5H 2 O solution and from wood treated with copper‐based preservatives was studied. It was shown that particle size played a very important role in the adsorp…
Using self-consistent-field simulation, a perforated lamella (PL) is investigated under an applied electric field. The perforated lamella is obtained by confining a cylinder-forming diblock copolymer melt in a thin film with a thickness of the spacing between cylinders in the bulk equilibrium state. Upon application o…
Hydrothermal growth of ZnO nanorods with their c -axis aligned parallel to the surface of a Si (100) wafer substrate is demonstrated. With appropriate choice of process conditions (precursor concentrations, solution temperature, growth time), the (002) face of such nanorods is seen to support the emergence of as many…
Solid-state proton nuclear magnetic resonance (NMR) has been used to investigate the structure and dynamics of a thermoplastic polyurethane elastomer (TPE) filled with carbon nanofibers (CNF’s) for shape-memory applications. The TPE soft segments are above their glass transition temperature ( T g ) at ambient temperat…
A set of aromatic−aliphatic copolyesters were synthesized by ring-opening polymerization of hexamethylene terephthalate (HT) cyclic oligomers and ϵ-caprolactone monomer (CL) at 175 °C using Sb 2 O 3 catalyst. A hexamer- and heptamer-enriched cyclic fraction isolated from the product obtained in the cyclo-depolymerizat…
Abstract Der Nanometerbereich oder Nanobereich ist mehr als nur das Verbindungsstück zwischen der molekularen und makroskopischen Welt – es ist der spezifische Bereich, in dem chemische Information erfasst, verarbeitet und übertragen wird. In diesem Aufsatz betrachten wir die lebende Zelle als ein in sich geschlossene…
Online powder X-ray diffraction, employing a flow-through cell [Hammond et al. Cryst. Growth Des. 2004, 4, 943] and a previously developed chemometric method [Chen et al. Anal. Chem. 2005, 77, 6563], was applied for quantitative analysis of the polymorphic phase transformation from the metastable α-form to the stable…
Kanten und Stufen sind die Stellen, an denen sich laut DFT-Rechnungen und aberrationskorrigierter Transmissionselektronenmikroskopie Oberflächen- (O2) und unter der Oberfläche liegende Sauerstoffatome (O1) auf Silberpartikeln befinden. Das experimentelle Verfahren ermöglicht eine saubere Abbildung von Oberflächenmerkm…
Electrical treeing in LDPE and three LDPE nanocomposites, with spherical silica and fibrous and laminar phyllosilicates, has been studied. Electrical tests were performed at a 50 Hz frequency and voltages between 8 and 29 kV, and the time to inception of the first electrical partial discharges (TTI) of the electrical…
The adsorption of a linear- and bottle-brush poly(ethylene oxide (PEO))-based polymer, having comparable molecular weights, was studied by means of quartz crystal microbalance with dissipation monitoring ability (QCM-D) and AFM colloidal probe force measurements. The energy dissipation change monitored by QCM-D and th…
Lead-free piezoelectric Mn-doped Na 0.5 K 0.5 NbO 3 (NKN) single crystals have been fabricated by self flux method using KF–NaF eutectic composition. The color of the obtained crystals was different depending on the doped Mn-chemicals. The large-sized single crystals with crystal face of orthorhombic (110) were obtain…
CO is widely used as selectivity enhancer in the selective hydrogenation of acetylene to ethylene over palladium catalysts in the petrochemical industry. However, conclusions on its action mechanism from experiments are controversial because of the complexity of the resulting catalytic system. Density functional theor…
Synthesis of phthalocyanines with asymmetrical substitution on the periphery is often difficult due the problems in purification of the phthalocyanine mixtures obtained. Using a poly(ethylene glycol) (PEG)-based support with a Wang-type linker, we have developed the synthesis of monohydroxylated, oligoethylene glycol…
The oxidation of metals is, by definition, a reaction between a gas and a solid which usually produces a solid reaction product. At first glance, this would therefore seem to be a very simple process but, in fact, it is considerably more complex. One would like to think that the reaction product, i.e., the scale that…
Lead-free piezoelectric ceramics (Bi 0.94− x La x Na 0.94 ) 0.5 Ba 0.06 TiO 3 have been fabricated by an ordinary sintering technique, and their piezoelectric and ferroelectric properties have been studied. The results of x-ray diffraction reveal that La 3+ and Ba 2+ diffuse into the Bi 0.5 Na 0.5 TiO 3 lattices to fo…
A relationship between the temperature and the dielectric strength of a Maxwell–Wagner (MW) type relaxation was deduced based on the conventional two-layer model for inhomogeneous systems and under the usual assumptions that the conductivity of each layer obeys the thermally activated law and the dielectric constant o…
CdTeSe and CdTeS ternary quantum dots (QDs) that fluoresce in the red to near-IR regions have been prepared using chemical aerosol flow synthesis (CAFS). Changing the composition ratio of Te to Se permits bandgap tuning of CdTeSe QDs, and replacing selenium with sulfur in the precursor solution increased the quantum e…
Thin oxygen-ion-conducting films (5−10 µm) were prepared and characterized on mixed-conducting porous substrates. When this film is made of a pure ionic conductor, such as a gadolinia-doped ceria (Ce 0.8 Gd 0.2 O 1.9 ) electrolyte material, the assembly can be used as a cathode-supported solid oxide fuel cell (SOFC) f…
The mechanical properties and pressure-induced structural transitions of single-walled carbon nanotubes (SWCNTs) are studied in this paper in the theoretical scheme of the higher-order gradient continuum. Both the first- and second-order deformation gradients are involved in the approximation of the deformations of mi…
The second peak in the optical absorption spectrum of PbSe nanocrystals is arguably the most discussed optical transition in semiconductor nanocrystals. Ten years of scientific debate have produced many theoretical and experimental claims for the assignment of this feature as the 1P e1P h as well as the 1S h,e1P e,h t…