Searched for: author%3A%22Groen%2C+W.A.%22
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Khanbareh, H. (author), de Boom, K. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Tri-phase PZT-porous polyurethane (PU) composites are investigated with the aim of developing conformable, highly sensitive tactile sensors for application in Human-Machine Interactions. The main goal is to reduce the dielectric constant of the polymer matrix, and improve flexibility of traditional diphase piezo-composites, consisting of ceramic...
article 2017
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Deutz, D.B. (author), Mascarenhas, N.T. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Composites of aligned (K,Na,Li)NbO3 (KNLN) piezoceramic particles in a PDMS polymer matrix are presented as promising materials for flexible sensors and energy harvesters. Their ease of processing is matched with a relatively high damage tolerance and piezoelectric performance at low dielectric loss. To maximize piezoelectric performance, the...
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), van der Zwaag, S. (author), Groen, W.A. (author)
In this study the influence of Li substitution on the piezoelectric performance of lead free K0.5Na0.5NbO3 (KNN)-epoxy composites is explored. Cuboid KNN piezoceramic particles modified with 0 to 12 mol.% of Li are prepared via a double calcination technique. The KNN-based particles are dispersed at 10 vol.% in an epoxy matrix to develop both...
article 2017
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Khanbareh, H. (author), der Zwaag, S.van (author), Groen, W.A. (author)
Composites of lead zirconate titanate particles in an epoxy matrix are prepared in the form of 0–3 and quasi 1–3 with different ceramic volume contents from 10% to 50%. Two different processing routes are tested. Firstly a conventional dielectrophoretic structuring is used to induce a chain-like particle configuration, followed by curing the...
article 2017
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Oostra, A.J. (author), Reddy, A. (author), Smits, E.C.P. (author), Abbel, R.J. (author), Groen, W.A. (author), Blom, P.W.M. (author), Michels, J.J. (author)
A method is presented to self-repair cracks in embedded silver grid structures used in large area organic electronics. The repair procedure is based on electro-deposition, incited by the application of a moderate DC voltage across the crack. During this process the organic anode that is in direct electrical contact with the silver grid,...
article 2016
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Shaji Karapuzha, A. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Modern flexible and sensitive sensors based on polymer–ceramic composites employ lead zirconate titanate (PZT) granulates having the morphotropic phase boundary (MPB) composition as the piezo active ingredient, as this composition gives the best properties in fully ceramic piezoelectric sensors. In this study, the possibility of using PZT...
article 2016
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James, N.K. (author), Comyn, T. (author), Hall, D. (author), Daniel, L. (author), Kleppe, A. (author), van der Zwaag, S. (author), Groen, W.A. (author)
The poling behaviour of tetragonal lead zirconate titanate (PZT) piezoelectric ceramic particles in a weakly conductive ionomer polymer matrix is investigated using high energy synchrotron X-ray diffraction analysis. The poling efficiency, crystallographic texture and lattice strain of the PZT particles inside the polymer matrix are determined...
article 2016
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Karapuzha, A.S. (author), James, N.K. (author), Khanbareh, H. (author), van der Zwaag, S. (author), Groen, W.A. (author)
The effects of Zr/Ti ratio on the dielectric and piezoelectric properties of the sintered Pb(ZrxTi(1−x))0.99Nb0.01O3 piezoelectric ceramics across the entire range of phase diagram of the PZT solid solution was studied systematically. The materials were prepared by the conventional mixed oxide process. The phase purity and crystal structure of...
article 2016
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Gelinck, G.H. (author), Kumar, A. (author), Moet, D. (author), van der Steen, J.L.P.J. (author), van Breemen, A.J.J.M. (author), Shanmugam, S. (author), Langen, A. (author), Gilot, J. (author), Groen, W.A. (author), Andriessen, H.A.J.M. (author), Simon, M. (author), Ruetten, W. (author), Douglas, A.U. (author), Raaijmakers, R. (author), Malinowski, P.E. (author), Myny, K. (author)
We made and characterized an X-ray detector on a 25-ìm-thick plastic substrate that is capable of medicalgrade performance. As an indirect conversion flat panel detector, it combined a standard scintillator with an organic photodetector (OPD) layer and oxide thin-film transistor backplane. Using solution-processed organic bulk heterojunction...
article 2016
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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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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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Loock, F.V. (author), Deutz, D.B. (author), van der Zwaag, S. (author), Groen, W.A. (author)
The active and passive piezoelectric response of lead zirconium titanate (PZT)-epoxy particulate composites loaded in shear is studied using analytical models, a finite element model and by experiments. The response is compared to that of the same composites when loaded in simple tension. Analogously to bulk PZT, particulate PZT-polymer...
article 2016
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Galagan, Y. (author), Eggenhuisen, T.M. (author), Coenen, M.J.J. (author), Biezemans, A.F.K.V. (author), Verhees, W.J.H. (author), Veenstra, S.C. (author), Groen, W.A. (author), Andriessen, R. (author), Janssen, R.A.J. (author)
In this paper we discuss a problem-solving methodology and present guidance for troubleshooting defects in ITO-free all-solution processed organic solar cells with an inverted cell architecture. A systematic approach for identifying the main causes of failures in devices is presented. Comprehensive analysis of the identified failure mechanisms...
article 2015
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Khanbareh, H. (author), Hegde, M. (author), van der Zwaag, S. (author), Groen, W.A. (author)
High performance polymer-ceramic composites are presented as promising candidates for high temperature piezoelectric sensing applications. lead-titanate (PT) ceramic particulate is incorporated into a polyetherimide polymer matrix, (PEI) at a specific volume fraction of 20% in the forms of 0-3 and quasi 1-3. A conventional dielectrophoretic...
conference paper 2015
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Abbel, R. (author), Teunissen, P. (author), Michels, J. (author), Groen, W.A. (author)
Inkjet printed silver lines contract to widths below 20-μm during drying on an organic planarization coating. Aspect ratios previously unprecedented with single pass inkjet printing on isotropic homogeneous substrates are obtained. This effect is caused by the subsequent evaporation of solvents from the ink, which results in a continuous...
article 2015
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Eggenhuisen, T.M. (author), Galagan, Y.O. (author), Biezemans, A.F.K.V. (author), Slaats, T.M.W.L. (author), Voorthuijzen, W.P. (author), Kommeren, S. (author), Shanmugam, S. (author), Teunissen, J.P. (author), Hadipour, A. (author), Verhees, W.J.H. (author), Veenstra, S.C. (author), Coenen, M.J.J. (author), Gilot, J. (author), Andriessen, H.A.J.M. (author), Groen, W.A. (author)
The organic photovoltaics field is maturing and reaching a technology readiness level where the focus is on developing large scale fabrication methods. In this light, fully inkjet printed organic solar cells were demonstrated. Inkjet printing allows direct patterning of all the layers, including the electrodes, offering full freedom of design...
article 2015
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Khanbareh, H. (author), Schelen, J.B.J. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Pyroelectric properties of materials can be accurately determined by applying a new digital signal processing method on the discrete sampled data obtained with a temperature oscillation technique. The pyroelectric coefficient is calculated from the component of the generated current 90(∘) out of phase with respect to the sinusoidal temperature...
article 2015
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Deutz, D.B. (author), Tempelman, E. (author), van der Zwaag, S. (author), Groen, W.A. (author)
To enable the design of more intuitive product user interfaces, the prospects of matching piezoelectric touch sensors with flexible organic light emitting diode (OLED) technology are investigated. Low stiffness piezoelectric composite sensors, combining piezoelectric Pb(Zr,Ti)O3 powder with a polymer matrix, are prepared and compared to existing...
article 2015
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Galagan, Y. (author), Fledderus, H. (author), Gorter, H. (author), 't Mannetje, H.H. (author), Shanmugam, S. (author), Mandamparambil, R. (author), Bosman, J. (author), Rubingh, J.M. (author), Teunissen, J.P. (author), Salem, A. (author), de Vries, I.G. (author), Andriessen, R. (author), Groen, W.A. (author)
Flexible semi-transparent organic photovoltaic (OPV) modules were manufactured by roll-to-roll slot–die coating of three functional layers [ZnO, photoactive layer, and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)] and either the screen printing or inkjet printing of the top electrodes. A poly(3-hexylthiophene):[6,6] phenyl...
article 2015
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