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Träfflista för sökning "WFRF:(Baumann Stefan) srt2:(2016)"

Sökning: WFRF:(Baumann Stefan) > (2016)

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1.
  • Ramasamy, Madhumidha, et al. (författare)
  • Influence of Microstructure and Surface Activation of Dual-Phase Membrane Ce0.8Gd0.2O2−δ–FeCo2O4 on Oxygen Permeation
  • 2016
  • Ingår i: Journal of The American Ceramic Society. - : Wiley. - 0002-7820 .- 1551-2916. ; 99:1, s. 349-355
  • Tidskriftsartikel (refereegranskat)abstract
    • Dual-phase oxygen transport membranes are fast-growing research interest for application in oxyfuel combustion process. One such potential candidate is CGO-FCO (60 wt% Ce0.8Gd0.2O2−δ–40 wt% FeCo2O4) identified to provide good oxygen permeation flux with substantial stability in harsh atmosphere. Dense CGO-FCO membranes of 1 mm thickness were fabricated by sintering dry pellets pressed from powders synthesized by one-pot method (modified Pechini process) at 1200°C for 10 h. Microstructure analysis indicates presence of a third orthorhombic perovskite phase in the sintered composite. It was also identified that the spinel phase tends to form an oxygen deficient phase at the grain boundary of spinel and CGO phases. Surface exchange limitation of the membranes was overcome by La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) porous layer coating over the composite. The oxygen permeation flux of the CGO-FCO screen printed with a porous layer of 10 μm thick LSCF is 0.11 mL/cm2 per minute at 850°C with argon as sweep and air as feed gas at the rates of 50 and 250 mL/min.
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2.
  • Trong Dinh, Nghia, et al. (författare)
  • High-resolution inkjet printing of conductive carbon nanotube twin lines utilizing evaporation-driven self-assembly
  • 2016
  • Ingår i: Carbon. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0008-6223 .- 1873-3891. ; 96, s. 382-393
  • Tidskriftsartikel (refereegranskat)abstract
    • We report about the inkjet printing of multi-walled carbon nanotubes (MWCNTs) for conductive tracks. The MWCNTs were grown by chemical vapor deposition allowing a defined length and diameter. An inkjet-printable ink formulation was prepared by dispersing the MWCNTs in water. Inkjet-printed high resolution patterns were obtained by printing the prepared ink formulation on silicon wafers utilizing evaporation-driven self-assembly processes. After the deposition of the ink, the solvent evaporation induces material flows within the liquid moving the MWCNTs preferably to the edges of the printed patterns as well as to the print starting position where they assemble. Atomic force microscopy (AFM) reveals a preferential orientation of the deposited MWCNTs. The resulting deposit pattern is well-known as coffee-ring effect which is used here to enable high resolution printing and self-ordering of the MWCNTs. Depending on different print parameters such as drop spacing or substrate temperature, conductive track widths in the range of 5-15 mu m were achieved with a electrical resistivity of about 3.9.10(-3) to 5.6.10(-3) Omega.m measured by current-sensitive AFM. (C) 2015 Elsevier Ltd. All rights reserved.
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