Materials Literature
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Rubber O-rings exposed to high-pressure hydrogen gas swell, and the volume increase induced by swelling influences tensile properties of the O-rings. Samples of nonfilled (NF), carbon black-filled (CB), and silica-filled (SC) sulfur-vulcanized acrylonitrile-butadiene rubber were exposed to hydrogen at 30 °C and pressu…
A spiropyran-amide-dipicolylamine linkage behaves as a colorimetric receptor for selective Co(2+) sensing in aqueous media under UV irradiation. This is promoted by strong coordination of Co(2+) with amide oxygens of the receptors and efficient photoisomerization of the spiropyran moieties.
In the module range of 1.5 – 4 mm hobbing is still the most productive process for external gears. The trend for green manufacturing and the increasing cost pressures lead to an increase of dry hobbing. To apply dry hobbing, the cutting speed has to be increased compared to wet cutting. This paper shows that dry hobbi…
Vertically and laterally oriented cobalt dendrite films with or without dendritic structures were synthesized by cathodic electrodeposition under different experimental conditions. The morphology of Co deposits was varied significantly depending on deposition conditions such as applied potential, precursor concentrati…
Quasicrystals represent aperiodically ordered form of solids with symmetries long thought forbidden in nature. Since their discovery, the fundamental key question has been "where are the atoms?" in these novel aperiodic solids, and electron microscopy has indeed provided images of real atomic arrangements in quasicrys…
A new class of nitric oxide (NO)-releasing biodegradable polymers has been synthesized by derivatizing poly(lactic-co-glycolic-co-hydroxymethyl propionic acid) (PLGH) polymers with structurally unique thiol functionalities followed by nitrosation with t-butyl nitrite to yield pendant S-nitrosothiol moieties. The exten…
The second order nonlinear optical properties of BaTeMo2O9 were studied by means of Maker fringe technology and the phase matching method. The value and relative sign of the second order nonlinear optical coefficients were obtained, with the largest being d31 = 9.88 pm/V. At 1064 nm, the crystal can support noncritica…
A number of adducts of copper(I) thiocyanate with bulky tertiary phosphine ligands, and some nitrogen-base solvates, were synthesized and structurally and spectroscopically characterised. CuSCN:PCy3 (1:2), as crystallized from pyridine, is shown by a single crystal X-ray study to be a one-dimensional polymer ...(Cy3P)…
Pulsed laser deposition was proved as a suitable method for hydroxyapatite (HA) coating of coaxial poly-ɛ-caprolactone/polyvinylalcohol (PCL/PVA) nanofibers. The fibrous morphology of PCL/PVA nanofibers was preserved, if the nanofiber scaffold was coated with thin layers of HA (200 nm and 400 nm). Increasing thickness…
To elucidate the effect of polymeric branched architecture on the protein resistant properties, the protein adsorption behaviour of polymers with different branched architectures on a gold surface was investigated. A series of poly((S-(4-vinyl) benzyl S′-propyltrithiocarbonate)-co-(poly(ethylene glycol) methacrylate))…
Polymer dispersed liquid crystal (PDLC) films were formed by thermal polymerisation-induced phase separation in epoxy monomer/polyamine/liquid crystal (LC) mixtures. The effects of the epoxy monomer functionality on the morphology of polymer network, electro-optical and peel strength of PDLC films were studied. As the…
This overview provides a brief summary of the current state for the fluoropolymer field. It includes fundamental fluorpolymer chemistry, fluorinated coatings, biomedical applications, fluorinated materials in composites, fluorinated elastomers and copolymer synthetic strategies. The above mentioned research areas are…
We report on the design, the fabrication and the measurement of a microwave dual band absorber in microwave regime. The single unit cell consists of two closed ring resonators and a metallic ground plane separated by an FR4 layer. Experimental results show that the absorber has two distinctive absorption peaks at freq…
In recent years, lignocellulosic fibres are increasingly used as reinforcements in many thermoset and thermoplastic matrices for the production of low-cost and lightweight materials to be used as building materials, automotive components and consumer goods due to the environmental concern. In this study, polymer compo…
In this paper, ZnO nanoparticles were prepared by a wet chemical method. The sample was characterized by X-ray diffraction (XRD), UV–Vis spectroscopy, Fourier transform infrared (FTIR) spectroscopy and photoluminescence. The average crystal size of the prepared ZnO nanopowder was determined by XRD. UV absorption spect…
Polypyrrole (PPy) nanowires were prepared by in situ polymerization of pyrrole in the presence of cetyltrimethylammonium bromide stabilized graphene (GCR). PPy nanowire/GCR composites with different loading ratios were tested as supercapacitor electrode materials in both 1 M H2SO4 (aq) and 1 M KCl (aq) electrolytes, a…
Nanocrystalline graphite films composed of carbon nanowalls and cone-shaped carbon nanotubes have been synthesized without the use of any catalyst by means of plasma enhanced chemical vapor deposition in the plasma of direct current glow discharge. The effect of growth temperature on the structural and field emission…
Luminescent lanthanide complexes incorporating Yb(3+) and Nd(3+) are attracting much attention as imaging agents, but there have been few practical methods to make responsive sensors with these complexes. Here, we introduce a general strategy to synthesize near-infrared luminescent probes by conjugating a Yb(3+) chela…
Excited-state conversions were observed from a series of twisted pyrene-substituted tridurylboranes, corresponding to a locally excited (LE) state, a more planar charge transfer (CT) state with a higher fluorescence quantum efficiency, and a more twisted CT state.
Phase-pure samples of sodium rare-earth phosphate tungstates Na(2)RE(PO(4))(WO(4)) (RE = Y, Dy-Lu) and Na(2)Y(PO(4))(WO(4)):Ln(3+) (Ln = Eu, Tb) were obtained by reaction of the respective rare-earth oxide with ammonium hydrogen phosphate with sodium tungstate Na(2)WO(4)·2H(2)O as a flux at 1220 K. According to X-ray…