(1 - 20 of 329)

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Velders, G.J.M. (author), Maas, R.J.M. (author), Geilenkirchen, G.P. (author), de Leeuw, F.A.A.M. (author), Ligterink, N.E. (author), Ruyssenaars, P. (author), de Vries, W.J. (author), Wesseling, J. (author)
Policies implemented in Europe since the 1970s to improve the air quality have resulted in decreases in emissions in many countries with corresponding reductions in concentrations of sulphur dioxide (SO2), nitrogen dioxide (NO2) and particulate matter (PM). We report here how much the air quality and associated health effects in the Netherlands...
article 2020
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Zhao, D. (author), Lenz, T. (author), Gelinck, G.H. (author), Groen, P. (author), Damjanovic, D. (author), de Leeuw, D.M. (author), Katsouras, I. (author)
Depolarization in ferroelectric materials has been studied since the 1970s, albeit quasi-statically. The dynamics are described by the empirical Merz law, which gives the polarization switching time as a function of electric field, normalized to the so-called activation field. The Merz law has been used for decades; its origin as domain-wall...
article 2019
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Stuber, V.L. (author), Deutz, D.B. (author), Bennett, J. (author), Cannel, D. (author), de Leeuw, D.M. (author), van der Zwaag, S. (author), Groen, P. (author)
Vibrational piezoelectric energy harvesters are being investigated to replace batteries in embedded sensor systems. The energy density that can be harvested depends on the figure of merit, d 33 g 33 , where d 33 and g 33 are the piezoelectric charge and voltage coefficient. Commonly used piezoelectric materials are based on inorganic ceramics,...
article 2019
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Deutz, D.B. (author), Pascoe, J.A. (author), Schelen, B. (author), van der Zwaag, S. (author), de Leeuw, D.M. (author), Groen, P. (author)
Piezoelectric energy harvesters are at the front of scientific research as enablers of renewable, sustainable energy for autonomous wireless sensor networks. Crucial for this disruptive technology is the achievable output power. Here we show, analytically, that the maximum output energy per unit volume, under a single sinusoidal excitation, is...
article 2018
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Zhao, D. (author), Lenz, T. (author), Katsouras, I. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
In this work, the macroscopic polarization of a ferroelectric capacitor is correlated with the local domain morphology. To this end, a ferroelectric capacitor of the random copolymer poly(vinylidenefluoride-trifluoroethylene) [P(VDF-TrFE)] is poled to a set polarization state in a Sawyer-Tower setup. After chemically removing the top electrode,...
article 2017
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Albert, M.F.M.A. (author), Anguelova, M.D. (author), Manders, A.M.M. (author), Schaap, M. (author), de Leeuw, G. (author)
Satellite-based whitecap fraction (W) data have been used to predict sea spray aerosol (SSA) emission rates. This allows to evaluate how an account for natural variability of whitecaps in the W parameterization would affect SSA mass flux predictions when using a sea spray source function (SSSF) based on the whitecap method. Data set containing W...
conference paper 2017
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Smits, E.C.P. (author), Walter, A. (author), de Leeuw, D.M. (author), Asadi, K. (author)
Transfer of graphene and other two-dimensional materials is still a technical challenge. The 2D-materials are typically patterned after transfer, which leads to a major loss of material. Here, we present laser induced forward transfer of chemical vapor deposition grown graphene layers with well-defined shapes and geometries. The transfer is...
article 2017
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Martín, J. (author), Zhao, D. (author), Lenz, T. (author), Katsouras, I. (author), de Leeuw, D.M. (author), Stingelin, N. (author)
Poly(vinylidene fluoride) (PVDF) has long been regarded as an ideal piezoelectric 'plastic' because it exhibits a large piezoelectric response and a high thermal stability. However, the realization of piezoelectric PVDF elements has proven to be problematic due to, amongst other reasons, the lack of industrially scalable methods to process PVDF...
article 2017
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Lenz, T. (author), Hummel, R. (author), Katsouras, I. (author), Groen, W.A. (author), Nijemeisland, M. (author), Ruemmler, R. (author), Schäfer, M.K.E. (author), de Leeuw, D.M. (author)
Recently reported piezoresponse force microscopy (PFM) measurements have proposed that porcine aortic walls are ferroelectric. This finding may have great implications for understanding biophysical properties of cardiovascular diseases such as arteriosclerosis. However, the complex anatomical structure of the aortic wall with different...
article 2017
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Deutz, D.B. (author), Mascarenhas, N.T. (author), Schelen, J.B.J. (author), de Leeuw, D.M. (author), van der Zwaag, S. (author), Groen, P. (author)
A highly sensitive, lead-free, and flexible piezoelectric touch sensor is reported based on composite films of alkaline niobate K0.485Na0.485Li0.03NbO3 (KNLN) powders aligned in a polydimethylsiloxane (PDMS) matrix. KNLN powder is fabricated by solid-state sintering and consists of microcubes. The particles are dispersed in uncured PDMS and...
article 2017
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Lenz, T. (author), Sharifi Dehsari, H. (author), Asadi, K. (author), Blom, P.W.M. (author), Groen, W.A. (author), de Leeuw, D.M. (author)
We demonstrate that ferroelectric memory diodes can be utilized as switching type positive temperature coefficient (PTC) thermistors. The diode consists of a phase separated blend of a ferroelectric and a semiconducting polymer stacked between two electrodes. The current through the semiconducting polymer depends on the ferroelectric...
article 2016
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van der Kaap, N.J. (author), Katsouras, I. (author), Asadi, K. (author), Blom, P.W.M. (author), Koster, L.J.A. (author), de Leeuw, D.M. (author)
The current density-voltage (J-V) characteristics of hole-only diodes based on poly(2-methoxy, 5-(2′ ethyl-hexyloxy)-p-phenylene vinylene) (MEH-PPV) were measured at a wide temperature and field range. At high electric fields the temperature dependence of the transport vanishes, and all J-V sweeps converge to a power law. Nuclear tunneling...
article 2016
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Zhao, D. (author), Katsouras, I. (author), Asadi, K. (author), Groen, W.A. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
A homogeneous ferroelectric single crystal exhibits only two remanent polarization states that are stable over time, whereas intermediate, or unsaturated, polarization states are thermodynamically instable. Commonly used ferroelectric materials however, are inhomogeneous polycrystalline thin films or ceramics. To investigate the stability of...
article 2016
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Friess, U. (author), Klein Baltink, H. (author), Beirle, S. (author), Clémer, K. (author), Hendrick, F. (author), Henzing, B. (author), Irie, H. (author), de Leeuw, G. (author), Li, A. (author), Moerman, M.M. (author), Van Roozendael, M. (author), Shaiganfar, R. (author), Wagner, T. (author), Wang, Y. (author), Xie, P. (author), Yilmaz, S. (author), Zieger, P. (author)
A first direct intercomparison of aerosol vertical profiles from Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations, performed during the Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI) in summer 2009, is presented. Five out of 14 participants of the CINDI campaign reported aerosol...
article 2016
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Albert, M.F.M.A. (author), Anguelova, M.D. (author), Manders, A.M.M. (author), Schaap, M. (author), de Leeuw, G. (author)
In this study, the utility of satellite-based whitecap fraction (<i>W</i>) data for the prediction of sea spray aerosol (SSA) emission rates is explored. More specifically, the study aims at evaluating how an account for natural variability of whitecaps in the <i>W</i> parameterization would affect SSA mass flux predictions when using a sea...
article 2016
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de Leeuw, G. (author), Holzer-Popp, T. (author), Bevan, S. (author), Davies, W.H. (author), Descloitres, J. (author), Grainger, R.G. (author), Griesfeller, J. (author), Heckel, A. (author), Kinne, S. (author), Klüser, L. (author), Kolmonen, P. (author), Litvinov, P. (author), Martynenko, D. (author), North, P. (author), Ovigneur, B. (author), Pascal, N. (author), Poulsen, C. (author), Ramon, D. (author), Schulz, M. (author), Siddans, R. (author), Sogacheva, L. (author), Tanré, D. (author), Thomas, G.E. (author), Virtanen, T.H. (author), von Hoyningen Huene, W. (author), Vountas, M. (author), Pinnock, S. (author)
Satellite data are increasingly used to provide observation-based estimates of the effects of aerosols on climate. The Aerosol-cci project, part of the European Space Agency's Climate Change Initiative (CCI), was designed to provide essential climate variables for aerosols from satellite data. Eight algorithms, developed for the retrieval of...
article 2015
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Oostra, A.J. (author), Smits, E.C.P. (author), de Leeuw, D.M. (author), Blom, P.W.M. (author), Michels, J.J. (author)
The operational characteristics of organic solar cells manufactured with large area processing methods suffers from the occurrence of short-circuits due to defects in the photoactive thin film stack. In this work we study the effect of a shunt resistance on an organic solar cell and demonstrate that device performance is not affected negatively...
article 2015
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Katsouras, I. (author), Zhao, D. (author), Spijkman, M.J. (author), Li, M. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author), Asadi, K. (author)
The on/off current ratio in organic ferroelectric field-effect transistors (FeFETs) is largely determined by the position of the threshold voltage, the value of which can show large device-to-device variations. Here we show that by employing a dual-gate layout for the FeFET, we can gain full control over the on/off ratio. In the resulting dual...
article 2015
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Lenz, T. (author), Zhao, D. (author), Richardson, G. (author), Katsouras, I. (author), Asadi, K. (author), Glasser, G. (author), Zimmermann, S.T. (author), Stingelin, N. (author), Roelofs, W.S.C. (author), Kemerink, M. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
Ferroelectric nanostructures offer a promising route for novel integrated electronic devices such as non-volatile memories. Here we present a facile fabrication route for ferroelectric capacitors comprising a linear array of the ferroelectric random copolymer of vinylidenefluoride and trifluoroethylene (P(VDFTrFE)) interdigitated with the...
article 2015
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Zhao, D. (author), Katsouras, I. (author), Asadi, K. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
Switching, i.e., polarization reversal, of ferroelectric P(VDF-TrFE) thin films has been investigated in a wide range of applied electric field and temperature. The measured polarization transients can be quantitatively described by a compressed exponential function as originally formulated by Kolmogorov, Avrami, and Ishibashi (the KAI model)....
article 2015
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