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Kruit, K.D. (author), Vervloet, D. (author), Kapteijn, F. (author), Van Ommen, J.R. (author)
Non-ASF product distributions in Fischer–Tropsch synthesis can occur with a gradient in process conditions at the particle or reactor scale, leading to a gradient in chain growth probability a.Weighted summation of local product distributions gives the proper, non-ASF product distribution.
journal article 2013
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Tahmasebpoor, M. (author), Mart?n, L. De (author), Talebi, M. (author), Mostoufia, N. (author), Van Ommen, R.J. (author)
The effect of surface characteristics on the interaction between nanoparticles and their agglomeration in dense gas suspensions is still not fully understood. It is known that when the surface is covered with hydroxyl groups, the interaction between nanoparticles becomes substantially stronger than in the absence of these groups; this...
journal article 2013
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Bakker, J.J.W. (author), Zieverink, M.M.P. (author), Kapteijn, F. (author), Moulijn, J.A. (author), Kreutzer, M.T. (author)
Segmented flow in standard GC capillary columns, with a heterogeneous Pd catalyst on the walls, gave rapid information about catalytic processes in them. The residence time and conversion was monitored visually, greatly simplifying bench-scale optimization. Examples show the benefits of the elimination of pore diffusion and axial dispersion....
journal article 2011
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De Leeuwe, J. (author)
journal article 2011
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Perrotton, C. (author), Slaman, M. (author), Javahiraly, N. (author), Schreuders, H. (author), Dam, B. (author), Meyrueis, P. (author)
An optical fiber using palladium as sensitive layer is characterized in the range of 450 to 900 nm. The sensitive layer is deposited on the outside of a multimode fiber, after removing the optical cladding. The sensor is based on a measurement technique that uses the surface plasmon resonance effect. A continuous change in output intensity is...
journal article 2011
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Baldi, A. (author), Pálsson, G.K. (author), Gonzalez-Silveira, M. (author), Schreuders, H. (author), Slaman, M. (author), Rector, J.H. (author), Krishnan, G. (author), Kooi, B.J. (author), Walker, G.S. (author), Fay, M.W. (author), Hjörvarsson, B. (author), Wijngaarden, R.J. (author), Dam, B. (author), Griessen, R. (author)
Mg-Ti alloys have uncommon optical and hydrogen absorbing properties, originating from a “spinodal-like” microstructure with a small degree of chemical short-range order in the atomic distribution. In the present study we artificially engineer short-range order by depositing Pd-capped Mg/Ti multilayers with different periodicities....
journal article 2010
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Hanefeld, U. (author), Paravidino, M. (author), Sorgedrager, M. (author), Orru, R.V.A. (author)
Water concentration affects both the enantioselectivity and activity of enzymes in dry organic media. Its influence has been investigated using the hydrocyanation of benzaldehyde catalyzed by hydroxynitrile lyase cross-linked enzyme aggregate (MeHNL-CLEA) as a model reaction. The enzyme displayed higher enantioselectivity at higher water...
journal article 2010
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Boekhoven, J. (author), Van Rijn, P. (author), Brizard, A.M. (author), Stuart, M.C.A. (author), Van Esch, J.H. (author)
A ‘‘multisegment amphiphile’’ has been synthesized by covalently connecting two well known building blocks, a gelator and a micelle forming surfactant. Self-assembly results in the formation of compartmentalized nano-object displaying properties inherited from both parents.
journal article 2010
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Krishnan, G. (author), Kooi, B.J. (author), Palasantzas, G. (author), Pivak, Y. (author), Dam, B. (author)
In this work we present a unique transmission electron microscopy study of the thermal stability of gas phase synthesized Mg nanoparticles, which have attracted strong interest as high capacity hydrogen storage materials. Indeed, Mg nanoparticles with a MgO shell ( ? 3?nm thick) annealed at 300?°C show evaporation, void formation, and void...
journal article 2010
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Stachewicz, U. (author), Yurteri, C.U. (author), Marijnissen, J.C.M. (author), Dijksman, J.F. (author)
This study demonstrates that the hydrodynamic phenomena taking place inside the capillary limits the frequency range of voltage pulses for stable single event electrospraying (SEE), when the meniscus/cone size is defined by the inner diameter of the nozzle. For the analysis of SEE, we used a one-dimensional model describing the displacement and...
journal article 2009
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Van Steijn, V. (author), Kleijn, C.R. (author), Kreutzer, M.T. (author)
We describe the breakup of a confined gas thread in a cross-flowing stream of liquid at capillary numbers Ca<10-2. The breakup is initiated, not by a Plateau-Rayleigh instability, but by liquid that flows from the tip of the thread to the neck where pinch-off occurs. This flow, faster than previously estimated, is driven by different curvatures...
journal article 2009
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Perez, D.I. (author), Grau, M.M. (author), Arends, I.W.C.E. (author), Hollmann, F. (author)
Robust peroxidase-catalyzed enantiospecific oxyfunctionalizations can be achieved by simple light-driven in situ generation of hydrogen peroxide.
journal article 2009
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Filippi, M. (author), Rector, J.H. (author), Gremaud, R. (author), Van Setten, M.J. (author), Dam, B. (author)
We report the preparation of sodium alanate, a promising hydrogen storage material, in a thin film form using cosputtering in a reactive atmosphere of atomic hydrogen. We study the phase formation and distribution, and the hydrogen desorption, with a combination of optical and infrared transmission spectroscopy. We show that the hydrogen...
journal article 2009
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Baldi, A. (author), Palmisano, V. (author), Gonzalez-Silveira, M. (author), Pivak, Y. (author), Slaman, M. (author), Schreuders, H. (author), Dam, B. (author), Griessen, R. (author)
The thermodynamics of hydrogen absorption in Pd-capped Mg films are strongly dependent on the magnesium thickness. In the present work, we suppress such dependency by inserting a thin Ti layer between Mg and Pd. By means of optical measurements, we show that the surface energy contribution to the destabilization of MgH2 is negligible. The...
journal article 2009
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Brizard, A.M. (author), Stuart, M.C.A. (author), Van Esch, J.H. (author)
Interpenetrating networks (IPN) consist of two or more networks of different components which are entangled on a molecular scale and cannot be separated without breaking at least one of the networks. They are of great technological interest because they allow the blending of two or more otherwise incompatible properties or functions, and...
journal article 2009
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Schins, J.M. (author), Trinh, M.T. (author), Houtepen, A.J. (author), Siebbeles, L.D.A. (author)
The first two peaks of the optical extinction spectrum of PbSe nanocrystals in solution have been assigned in the literature to the 1Sh1Se and 1Ph1Pe transitions. In the present work we assign the transitions causing extinction in the energy region between these two lowest-energy peaks. Our femtosecond transient absorption data indicate that...
journal article 2009
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Baldi, A. (author), Gonzalez-Silveira, M. (author), Palmisano, V. (author), Dam, B. (author), Griessen, R. (author)
We tune the thermodynamics of hydrogen absorption in Mg by means of elastic clamping. The loading isotherms measured by hydrogenography show that Mg films covered with Mg-alloy-forming elements, such as Pd and Ni, have hydrogen plateau pressures more than 2 orders of magnitude higher than bulk Mg at the same temperature. An elastic model allows...
journal article 2009
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Carneiro, J.T. (author), Yang, C.C. (author), Moma, J.A. (author), Moulijn, J.A. (author), Mul, G. (author)
Gold deposition on Hombikat UV100 was found to negatively affect the activity of this Anatase catalyst in selective photo-oxidation of cyclohexane. By ammonia TPD and DRIFT spectroscopy it was determined that the Au deposition procedure leads to a significant decrease in OH-group density (mol m?2 BET) on Hombikat, suggesting that the amount of...
journal article 2009
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Gultekin, G. (author), Atalay-Oral, C. (author), Erkal, S. (author), Sahin, F. (author), Karastova, D. (author), Tantekin-Ersolmaz, S.B. (author), Guner, F.S. (author)
Fatty acid-based polyurethane films were prepared for use as potential wound dressing material. The polymerization reaction was carried out with or without catalyst. Polymer films were prepared by casting-evaporation technique with or without crosslink-catalyst. The film prepared from uncatalyzed reaction product with crosslink-catalyst gave...
journal article 2008
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Gultekin, G. (author), Ataly-Oral, C. (author), Erkai, S. (author), Sahin, F. (author), Karastova, D. (author), Tatntekin-Ersolmaz, S. (author), Guner, F. (author)
Fatty acid-based polyurethane films were prepared for use as potential wound dressing material. The polymerization reaction was carried out with or without catalyst. Polymer films were prepared by casting-evaporation technique with or without crosslink-catalyst. The film prepared from uncatalyzed reaction product with crosslink-catalyst gave...
journal article 2008
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