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The stress generated by non-Brownian fibers in turbulent channel flow simulations

Gillissen, J.J.J. (author), Boersma, B.J. (author), Mortensen, P.H. (author), Andersson, H.I. (author)

Turbulent fiber suspension channel flow is studied using direct numerical simulation. The effect of the fibers on the fluid mechanics is governed by a stress tensor, involving the distribution of fiber position and orientation. Properties of this function in channel flow are studied by computing the trajectories and orientations of individual...

journal article 2007

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The Einstein relation in quantum wires of III-V, ternary, and quaternary materials in the presence of light waves: Simplified theory, relative comparison, and suggestion for experimental determination

Ghatak, K.P. (author), Bhattacharya, S. (author), Bhowmik, S. (author), Benedictus, R. (author), Choudhury, S. (author)

We study the Einstein relation for the diffusivity to mobility ratio (DMR) in quantum wires (QWs) of III-V, ternary, and quaternary materials in the presence of light waves, whose unperturbed energy band structures are defined by the three band model of Kane. It has been found, taking n-InAs, n-InSb, n-Hg1?xCdxTe, n-In1?xGaxAsyP1?y lattice...

journal article 2008

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Thermal stability of gas phase magnesium nanoparticles

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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The effect of interface movement and viscosity variation on the stability of a diffusive interface between aqueous and gaseous CO2

Meulenbroek, B.J. (author), Farajzadeh, R. (author), Bruining, J. (author)

Carbon dioxide injected in an aquifer rises quickly to the top of the reservoir and forms a gas cap from where it diffuses into the underlying water layer. Transfer of the CO2 to the aqueous phase below is enhanced due to the high density of the carbon dioxide containing aqueous phase. This paper investigates the behavior of the diffusive...

journal article 2013

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Efficient approach to nucleation and growth dynamics: Stationary diffusion flux model

Van Putten, D.S. (author), Kalikmanov, V.I. (author)

A new model describing the evolution of clusters in the processes of nucleation and growth is proposed. The diffusion flux in the nonstationary Fokker–Planck equation with an unknown distribution function is approximated by the closed form expression containing the steady-state solution of the Zeldovich–Frenkel equation. This is justified due to...

journal article 2009

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Micro-imaging of transient guest profiles in nanoporous host systems of cylindrical symmetry

Binder, T. (author), Hibbe, F. (author), Chmelik, C. (author), Kärger, J. (author), Martinez-Joaristi, A. (author), Gascon, J. (author), Kapteijn, F. (author), Ruthven, D. (author)

Nanoporous host materials giving rise to transient guest profiles of cylindrical symmetry during molecular uptake and release are shown to provide particularly advantageous conditions for the study of guest diffusion by micro-imaging. Considering zeolites of structure type DDR (Deca-dodecasil 3R) as a host system and short-chain length...

journal article 2012

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Publisher's Note: Diffusion Impedance on Nickel/Gadolinia-Doped Ceria Anodes for Solid Oxide Fuel Cells [J. Electrochem. Soc., 156, B1417 (2009)]

Aravind, P.V. (author), Ouweltjes, J.P. (author), Schoonman, J. (author)

journal article 2009

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Substrate-dependent kinetics in tyrosinase-based biosensing: Amperometry vs. spectrophotometry

Rassaei, L. (author), Cui, J. (author), Goluch, E.D. (author), Lemay, S.G. (author)

Despite the broad use of enzymes in electroanalytical biosensors, the influence of enzyme kinetics on the function of prototype sensors is often overlooked or neglected. In the present study, we employ amperometry as an alternative or complementary method to study the kinetics of tyrosinase, whose catalytic activity results in o-quinone products...

journal article 2012

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Knudsen self- and Fickian diffusion in rough nanoporous media

Malek, K. (author), Coppens, M.O. (author)

The effect of pore surface roughness on Knudsen diffusion in nanoporous media is investigated by dynamic Monte Carlo simulations and analytical calculations. A conceptual difference is found between the roughness dependence of the macroscopic, transport diffusivity and the microscopic, self-diffusivity, which is reminiscent of diffusion in...

journal article 2003

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An analytical kinetic model for chemical-vapor deposition of pureB layers from diborane

Mohammadi, V. (author), De Boer, W.B. (author), Nanver, L.K. (author)

In this paper, an analytical model is established to describe the deposition kinetics and the deposition chamber characteristics that determine the deposition rates of pure boron (PureB-) layers grown by chemical-vapor deposition (CVD) from diborane (B2H6) as gas source on a non-rotating silicon wafer. The model takes into consideration the...

journal article 2012

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Drivers of residual estuarine circulation in tidally energetic estuaries: Straight and irrotational channels with parabolic cross section

Burchard, H. (author), Hetland, R.D. (author), Schulz, E. (author), Schuttelaars, H.M. (author)

The generation of residual circulation in a tidally energetic estuary with constant longitudinal salinity gradient and parabolic cross section is examined by means of a two-dimensional cross-sectional numerical model, neglecting river runoff and Stokes drift. It is shown how the longitudinal and lateral residual circulation can be decomposed...

journal article 2011

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An experimental study on the molecular organization and exciton diffusion in a bilayer of a porphyrin and poly(3-hexylthiophene)

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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Technology diffusion in hospitals: A log odds random effects regression model

Blank, J.L.T. (author), Valdmanis, V.G. (author)

This study identifies the factors that affect the diffusion of hospital innovations. We apply a log odds random effects regression model on hospital micro data. We introduce the concept of clustering innovations and the application of a log odds random effects regression model to describe the diffusion of technologies. We distinguish a number of...

journal article 2013

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Electron-beam-induced deposition of 3-nm-half-pitch patterns on bulk Si

Van Oven, J.C. (author), Berwald, F. (author), Berggren, K.K. (author), Kruit, P. (author), Hagen, C.W. (author)

This paper demonstrates electron-beam-induced deposition of few-nm-width dense features on bulk samples by using a scanning electron-beam lithography system. To optimize the resultant features, three steps were taken: (1) features were exposed in a repetitive sequence, so as to build up the deposited features gradually across the entire pattern,...

journal article 2011

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Hydrogen vacancies facilitate hydrogen transport kinetics in sodium hydride nanocrystallites

Singh, S. (author), Eijt, S.W.H. (author)

We report ab initio calculations based on density-functional theory, of the vacancy-mediated hydrogen migration energy in bulk NaH and near the NaH(001) surface. The estimated rate of the vacancy mediated hydrogen transport, obtained within a hopping diffusion model, is consistent with the reaction rates of H-D exchange in nano-NaH at the...

journal article 2008

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Energy resolution and related charge carrier mobility in LaBr3:Ce scintillators

Khodyuk, I.V. (author), Quarati, F.G.A. (author), Alekhin, M.S. (author), Dorenbos, P. (author)

The scintillation response of LaBr3:Ce scintillation crystals was studied as function of temperature and Ce concentration with synchrotron X-rays between 9?keV and 100?keV. The results were analyzed using the theory of carrier transport in wide band gap semiconductors to gain new insights into charge carrier generation, diffusion, and capture...

journal article 2013

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Selectivity and self-diffusion of CO2 and H2 in a mixture on a graphite surface

Trinh, T.T. (author), Vlugt, T.J.H. (author), Hägg, M.B. (author), Bedeaux, D. (author), Kjelstrup, S.H. (author)

We performed classical molecular dynamics (MD) simulations to understand the mechanism of adsorption from a gas mixture of CO2 and H2 (mole fraction of CO2 = 0.30) and diffusion along a graphite surface, with the aim to help enrich industrial off-gases in CO2, separating out H2. The temperature of the system in the simulation covered typical...

journal article 2013

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Onsager’s reciprocal relations in electrolyte solutions: I. Sedimentation and electroacoustics

Gourdin-Bertin, S. (author), Chassagne, C. (author), Bernard, O. (author), Jardat, M. (author)

In the framework of irreversible thermodynamics, we show that the sedimentation current in electrolyte solutions is mathematically equivalent to the low frequency limit of the ionic vibration current, appearing in the presence of an acoustic wave. This non-trivial result is obtained thanks to a careful choice of the reference frame used to...

journal article 2015

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The Role of Coherency Strains on Phase Stability in LixFePO4: Needle Crystallites Minimize Coherency Strain and Overpotential

Van der Ven, A. (author), Garikipati, K. (author), Kim, S. (author), Wagemaker, M. (author)

We investigate the role of coherency strains on the thermodynamics of two-phase coexistence during Li (de)intercalation of LixFePO4. We explicitly account for the anisotropy of the elastic moduli and analytically derive coupled chemical and mechanical equilibrium criteria for two-phase morphologies observed experimentally. Coherent two-phase...

journal article 2009

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Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance

Vlietstra, N. (author), Shan, J. (author), Castel, V. (author), Youssef, J.B. (author), Bauer, G.E.W. (author), Van Wees, B.J. (author)

The effective field torque of an yttrium-iron-garnet (YIG) film on the spin accumulation in an attached platinum (Pt) film is measured by the spin-Hall magnetoresistance (SMR). As a result, the magnetization direction of a ferromagnetic insulating layer can be measured electrically. Experimental transverse and longitudinal resistances are well...

journal article 2013