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Huijser, A. (author), Savenije, T.J. (author), Shalav, A. (author), Siebbeles, L.D.A. (author)The exciton root-mean-square displacement (?D) in regioregular poly(3-hexylthiophene) (P3HT) deposited onto meso-tetrakis (n-methyl-4-pyridyl) porphyrin tetrachloride (H2TMPyP) has been determined from the photovoltaic response of a device based on these materials in a bilayer configuration. Excitons formed on illumination that reach the...journal article 2008
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Vreeker, R. (author), Li, L. (author), Fang, Y. (author), Appelqvist, I. (author), Mendes, E. (author)In this paper, we study the rehydration properties of air-dried calcium alginate gel beads. Rehydration is shown to depend on alginate source (i.e. mannuronic to guluronic acid ratio) and the salt concentration in the rehydration medium. Rehydration curves are described adequately by the empirical Weibull equation. Wide-angle X-ray diffraction...journal article 2008
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Sprakel, J. (author), Van der Gucht, J. (author), Cohen Stuart, M.A. (author), Besseling, N.A.M. (author)We discuss the thermal motion of colloidal particles in transient polymer networks. For particles that are physically bound to the surrounding chains, light-scattering experiments reveal that the submillisecond dynamics changes from diffusive to Rouse-like upon crossing the network formation threshold. Particles that are not bound do not show...journal article 2008
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Zschiegner, S. (author), Russ, S. (author), Valiullin, R. (author), Coppens, M.O. (author), Dammers, A.J. (author), Bunde, A. (author), Kärger, J. (author)The diffusion of gas molecules in pores is determined by the collisions between the molecules as well as by the collisions of the molecules with the pore walls. In many applications the so-called Knudsen regime is of particular interest. In this regime the collisions of the molecules with the pore walls play the crucial role, while the inter...journal article 2008
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Tabrizi, N.S. (author), Ullmann, M. (author), Vons, V.A. (author), Lafont, U. (author), Schmidt-Ott, A. (author)The production of nanoparticles by microsecond spark discharge evaporation in inert gas is studied systematically applying transmission electron microscopy, mobility analysis and BET surface area measurement. The method of spark discharge is of special interest, because it is continuous, clean, extremely flexible with respect to material, and...journal article 2008
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Enabling Electrocatalytic Fischer–Tropsch Synthesis from Carbon Dioxide Over Copper-based ElectrodesShibata, H. (author), Moulijn, J.A. (author), Mul, G. (author)We report on the discovery that paraffins and olefins up to C6 hydrocarbons can be obtained in CO2 electroreduction at room temperature and atmospheric pressure by application of a commercially available Cu-electrode (Eurofysica), provided pretreatment by electropolishing is avoided. The product distribution follows the Schultz–Flory...journal article 2008
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De Lathouder, K.M. (author), Smeltink, M.W. (author), Straathof, A.J.J. (author), Paasman, M.A. (author), Van de Sandt, E.J.A.X. (author), Kapteijn, F. (author), Moulijn, J.A. (author)The objective of this work was to develop a hydrogel-coated monolith for the entrapment of penicillin G acylase (E. coli, PGA). After screening of different hydrogels, chitosan was chosen as the carrier material for the preparation of monolithic biocatalysts. This protocol leads to active immobilized biocatalysts for the enzymatic hydrolysis of...journal article 2008
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Van Miltenburg, A. (author), Gascon, J. (author), Zhu, W. (author), Kapteijn, F. (author), Moulijn, J.A. (author)The adsorption of propylene and propane on zeolite NaX with and without a saturated (36 wt%) amount of CuCl have been investigated. The single component adsorption isotherms could be well described with a Dual-Site Langmuir model. The dispersion of CuCl results in a decrease of the maximum adsorption capacity of the zeolite for both components....journal article 2008
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Stachewicz, U. (author), Dijksman, J.F. (author), Yurteri, C.U. (author), Marijnissen, J.C.M. (author)In order to use electrospraying as an on demand deposition method, well defined and reproducible single electrospraying events have been studied. To generate a single electrospraying event, rectangular voltage pulses superimposed on a constant bias voltage were applied, and optimum settings of the bias dc voltage for starting such an event were...journal article 2007
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Schins, J.M. (author), Hendry, E. (author), Bonn, M. (author), Muller, H.G. (author)We present an analytical expression for the observed signal in time- and phase-resolved pump-probe studies, with particular emphasis on terahertz time-domain spectroscopy. Maxwell’s equations are solved for the response of damped, harmonic oscillators to a driving probe field in the perturbative regime. Our analytical expressions agree with the...journal article 2007
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Van Hijkoop, V.J. (author), Dammers, A.J. (author), Malek, K. (author), Coppens, M.O. (author)Water diffusion through OmpF, a porin in the outer membrane of Escherichia coli, is studied by molecular dynamics simulation. A first passage time approach allows characterizing the diffusive properties of a well-defined region of this channel. A carbon nanotube, which is considerably more homogeneous, serves as a model to validate the...journal article 2007
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Loef, R. (author), Schoonman, J. (author), Goossens, A. (author)Type transformation in CuInSe2 and CuInS2 solar cells is an important issue with far reaching consequences. In the present study, the presence of a p-n homojunction inside CuInS2 in a TiO2/CuInS2 device is revealed with a detailed impedance spectroscopy and capacitance study. A n-type CuInS2 film with a thickness of 40?nm is found at the TiO2 (n...journal article 2007
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Savenije, T.J. (author), Nanu, M. (author), Schoonman, J. (author), Goossens, A. (author)Photoinduced interfacial charge carrier generation, separation, trapping, and recombination in TiO2?In2S3?CuInS2 cells have been studied with time-resolved microwave conductivity (TRMC). Single layer, double layer, and complete triple layer configurations have been studied. Selective electronic excitation in one of the components is accomplished...journal article 2007
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Scanning the critical fluctuations: Application to the phenomenology of the two-dimensional XY modelParedes, R. (author), Botet, R. (author)We show how applying field conjugated to the order parameter may act as a very precise probe to explore the probability distribution function of the order parameter. Using this “magnetic-field scanning” on large-scale numerical simulations of the critical two-dimensional XY model, we are able to discard the conjectured double-exponential form of...journal article 2006
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García-Rojo, R. (author), Luding, S. (author), Brey, J.J. (author)A study of the transport coefficients of a system of elastic hard disks based on the use of Helfand-Einstein expressions is reported. The self-diffusion, the viscosity, and the heat conductivity are examined with averaging techniques especially appropriate for event-driven molecular dynamics algorithms with periodic boundary conditions. The...journal article 2006
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Prins, P. (author), Grozema, F.C. (author), Nehls, B.S. (author), Farrell, T. (author), Scherf, U. (author), Siebbeles, L.D.A. (author)Alkyl substituted polyfluorenes are promising candidates for use in organic display applications due to efficient, pure blue (polarized) luminescence, high charge carrier mobility, and good processabilty. Poly(9,9?-dioctylfluorene) (PFO) is an especially interesting polyfluorene derivative, because of its self-organization into distinct...journal article 2006
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- Paredes, R. (author), Vásquez, C. (author) journal article 2006
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Nanu, M. (author), Boulch, F. (author), Schoonman, J. (author), Goossens, A. (author)Deep-level transient spectroscopy (DLTS) has been used to measure the concentration and energy position of deep electronic states in CuInS2. Flat TiO2?CuInS2 heterojunctions as well as TiO2-CuInS2 nanocomposites have been investigated. Subband-gap electronic states in CuInS2 films are mostly due to antisite point defects and vacancies....journal article 2005
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Matthias, H. (author), Röder, T. (author), Wehrspohn, R.B. (author), Kitzerow, H.S. (author), Matthias, S. (author), Picken, S.J. (author)Active tuning of photonic crystals can be achieved by filling the porous structures with liquid crystals. Here, the director field in macropores was studied by fluorescence confocal polarizing microscopy. For this purpose, the photonic crystal was infiltrated with a glass-forming liquid crystalline polymer, the sample was cooled below the glass...journal article 2005
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Sim, E. (author), Beckers, J. (author), De Leeuw, S. (author), Thorpe, M. (author), Ratner, M.A. (author)We introduce a simple semiempirical anharmonic Kirkwood–Keating potential to model AxB1?xC-type semiconductors. The potential consists of the Morse strain energy and Coulomb interaction terms. The optical constants of pure components, AB and BC, were employed to fit the potential parameters such as bond-stretching and -bending force constants,...journal article 2005