Search Results
Corrosion inhibiting cerium compounds for chromium-free corrosion protective coatings on AA 2024
2007, Schem, Michael, Schmidt, Thomas, Caparrotti, Hinka, Wittmar, Matthias, Veith, Michael
Due to the upcoming ban of chromium-containing corrosion protection coatings in the near future, there is a worldwide effort to find a replacement for chromium as a corrosion inhibitor that also exhibits self-healing properties in scratches but without the negative efects like health and environmental hazards. In the present study promising results to achieve this goal are shown by using cerium compounds incorporated into an organic-inorganic hybrid material produced by the sol-gel process. Cerium compounds like cerium nitrate, cerium nitrate plus acetylacetonate, cerium acetylacetonate, and cerium sulphate were incorporated in sol-gel coating systems. The corrosion protection properties of these coatings were determined by means of Electrochemical Impedance Spectroscopy (EIS) and in a conventional salt spray test. Furthermore, the leaching behaviour of the coatings was examined via Optical Emission Spectrometry (OES). Significant hints for self healing properties were obtained with a hybrid system doped with cerium nitrate in combination with acetylacetone.
Crystal structure of distrontium lanthanum gallium pentaoxide, Sr2LaGaO5
2000, Gesing, T.M., Uecker, R., Buhl, J.-C.
GaLaO5Sr2, tetragonal, I4/mcm (No. 140), a = 6.9339(4) Å, c = 11.2823(8) Å, V= 542.4 Å3, Z = 4, R(P) = 0.018, wR(P) = 0.027, R(I) = 0.031, T= 295 K.
Plasma-assisted modulation of morphology and composition in Tin oxide nanostructures for sensing applications
2007, Mathur, Sanjay, Ganesan, Rajesh, Ruegamer, Thomas, Shen, Hao, Barth, Sven
[no abstract available]
Synthesis of unsymmetrical bis(imidoyl)dichlorides of oxalic acid
2005, Helmholz, F., Schroeder, R., Langer, P.
Unsymmetrical oxalic acid-bis(imidoyl)dichlorides were prepared from ethyl 2-chloro-2-oxoacetate in three steps.
[1-Dimethylsilyl-2-phenyl-3-(η5-tetramethylcyclopentadienyl) prop-1-en-1-ylκC1](n5-pentamethylcyclopentadienyl)- titanium(III)
2009, Lamač, M., Spannenberg, A., Arndt, P., Rosenthal, U.
The title compound, [Ti(C10H15)(C20H 26Si)], was obtained from the reaction of [Ti{5: 1-C5Me4(CH2)}(5-C 5Me5)] with the alkynylsilane PhC2SiMe 2H. The complex crystallizes with two independent mol-ecules in the asymmetric unit, which differ in the conformation of the propenyl unit, resulting in their having opposite helicity. No inter-molecular inter-actions or inter-actions involving the Si- H bond are present. The observed geometrical parameters are unexceptional compared to known structures of the same type.
Crystal structure of η5-3,6-di-tert-butyl-4- (tris(pentafluorophenyl)boranyloxycarbonyl)-5-(η5- tetramethylcyclopentadienyl-methyl-9,10,11-trimethyl-bicyclo(6.3.0) undeca-4-en-8,10-dienyl)titanium(III) toluene hemisolvate, Ti(C 51H47BF15O2) · 0.5C 7H8
2008, Spannenberg, A., Burlakov, V.V., Rosenthal, U.
C54.50H51BF15O2Ti, triclinic, P1̄ (no. 2), a = 11.603(2) Å, b = 12.872(3) Å, c = 18.142(4) Å, α = 76.47(3)°, β = 77.99(3)°, γ = 69.13(3)°, V = 2438.2 Å5, Z = 2, Rgt(F) = 0.048, wRobs(F2) = 0.114, T = 200 K. © by Oldenbourg Wissenchaftsverlag.
Crystal structure of (2,3-bis((2R,5R)-2,5-dimethylphosphonalyl)maleic anhydride)-(η4-norbornadiene)-rhodium(I) tetrafluoroborate, [Rh(C7H8)(C16H24O3P 2)] [BF4]
2007, Holz, J., Börner, A., Heller, D., Drexler, H.-J.
C23H32BF4O3P2Rh, orthorhombic, P212121 (no. 19), a = 10.147(2) Å, b = 13.246(3) Å, c = 18.827(4) Å, V = 2530.5 Å3, Z = 4, Rgt(F) = 0.025, wRref(F 2) = 0.067, T = 200 K. © by Oldenbourg Wissenschaftsverlag,.
Research on the synthesis and applicability of surface modified nanoscaled metal oxide particles as curing catalyseres for UV-print-colours and lacquers
2009, Becker-Willinger, Carsten, Schmitz-Stöwe, Sabine, Bentz, Dirk
In the BMBF joint research project - NANOCURE - New Curing Methods for Print-Colours, Glues and Lacquers (prom. ref. : 13N9115) - a new class of nanoscaled photo initiators for radical polymerization processes in the printing industry is to be investigated. A possible mechanism for the reaction of TiO2 with acrylates, which is already described in literature is presented. Different methods of manufacturing TiO2 nanoparticles in the lower nanometric size range and their subsequent processing are described, the method is of special interest as it may lead to a possible integrated production process of UV-printing inks. The TEM analysis shows the homogeneous arrangement of TiO2 nanoparticles in an acrylic matrix, which is a necessary requirement for successful polymerization process. IR-spectroscopy is used to show the effect of TiO2-nanoparticles as UV photocatalytic polymerization initiators.
Refinement of the crystal structure of holmium nickel borocarbide, HoNiBC
2000, Geupel, S., Zahn, G., Paufler, P., Graw, G.
BCHoNi, tetragonal, P4/nmm (No. 129), a =3.5621(5) Å, c = 7.556(2) Å, V = 95.9 Å3, Z = 2, Rgt(F) = 0.030, wRref(F2) = 0.076, T= 300 K.