Searched for: author%3A%22van+den+Ende%2C+D.A.%22
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van den Ende, D.A. (author), Hendriks, R. (author), Cauchois, R. (author), Groen, W.A. (author)
In this work photonic energy from a high power xenon flash lamp is used for soldering thin chips on polyimide and polyester foil substrates using standard Sn-Ag-Cu lead free alloys. The absorption of the xenon light pulse leads to rapid heating of components and tracks up to temperatures above the solder melting temperature, while the...
article 2014
document
van den Ende, D.A. (author), Gubbels, G.H.M. (author)
In many optical and precision engineering applications, low thermal distortion materials need to be bonded together reliably. Since high temperature bonding process ultimately introduce stresses in the bond, rendering it dimensionally instable, room temperature or near room temperature processes are preferred. Low thermal distortion materials...
article 2014
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van den Ende, D.A. (author), Hendriks, R. (author), Cauchois, R. (author), Kusters, R.H.L. (author), Cauwe, M. (author), Groen, W.A. (author), van den Brand, J. (author)
Ultrathin bare die chips and small-size surface mount device components were successfully soldered using a novel roll-to-roll compatible soldering technology. A high-power xenon light flash was used to successfully solder the components to copper tracks on polyimide (PI) and polyethylene terephthalate (PET) flex foils by using a lead-free solder...
article 2014
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Van Den Ende, D.A. (author), Van De Wiel, H.J. (author), Kusters, R.H.L. (author), Sridhar, A. (author), Schram, J.F.M. (author), Cauwe, M. (author), Van Den Brand, J. (author)
Ultra-thin chips of less than 20 μm become flexible, allowing integration of silicon IC technology with highly flexible electronics such as food packaging sensor systems or healthcare and sport monitoring tags as wearable patches or even directly in clothing textile. The ultra-thin chips in these products will be bent to a very high curvature,...
article 2014
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James, N.K. (author), van den Ende, D.A. (author), Lafont, U. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Structured lead zirconium titanate (PZT)-epoxy composites are prepared by dielectrophoresis. The piezoelectric and dielectric properties of the composites as a function of PZT volume fraction are investigated and compared with the corresponding unstructured composites. The effect of poling voltage on piezoelectric properties of the composites is...
article 2013
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van den Ende, D.A. (author), Kusters, R.H.L. (author), Cauwe, M. (author), van der Waal, A. (author), van den Brand, J. (author)
Integration of LEDs on flexible foil substrates is of interest for flexible lighting applications and for backlights for flexible displays. Such a large area lighting device can be made by integrating a matrix of closely spaced LEDs on a flexible foil substrate. Preferably, these LEDs are integrated unpackaged, i.e. as bare dies, as this reduces...
article 2013
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van den Ende, D.A. (author), Kamminga, J.D. (author), Boersma, A. (author), Andritsch, T. (author), Steeneken, P.G. (author)
Wrinkling of elastomeric coatings by an electric field is reported. The associated changes in the coating's optical properties yield switchable mirrors and windows. The field Ec needed to induce wrinkling is a factor of 4.4 lower than the theoretically predicted value, which is attributed to space-charge injection. Copyright © 2013 WILEY-VCH...
article 2013
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van den Ende, D.A. (author), Fischer, H.R. (author), Groen, W.A. (author), van der Zwaag, S. (author)
The meso-scale surface roughness of piezoelectric fiber composites can be manipulated by applying an electric field to a piezocomposite with a polished surface. In the absence of an applied voltage, the tips of the embedded piezoelectric ceramic fibers are below the surface of the piezocomposite and a silicon wafer counter surface rests solely...
article 2013
document
van den Ende, D.A. (author), Maier, R.A. (author), van Neer, P.L.M.J. (author), van der Zwaag, S. (author), Randall, C.A. (author), Groen, W.A. (author)
In this work, the piezoelectric properties at high electric fields of dielectrophoretically aligned PZT - polymer composites containing high aspect ratio particles (such as short fibers) are presented. Polarization and strain as a function of electric field are evaluated. The properties of the composites are compared to those of PZT-polymer...
article 2013
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van den Ende, D.A. (author), van de Wiel, H.J. (author), Groen, W.A. (author), van der Zwaag, S. (author)
Direct piezoelectric strain energy harvesting can be used to power wireless autonomous sensors in environments where low frequency, high strains are present, such as in automobile tires during operation. However, these high strains place stringent demands on the materials with respect to mechanical failure or depolarization, especially at...
article 2012
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van den Ende, D.A. (author)
doctoral thesis 2012
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van den Ende, D.A. (author), Kusters, R.H.L. (author), Cauwe, M. (author), van der Waal, A. (author), van den Brand, J. (author)
Integration of LEDs on flexible foil substrates is of interest for flexible lighting applications and flexible photonic devices. A matrix of LEDs on a foil combined with a diffuser can be a potential alternative for flexible OLED lighting devices. Preferably, these LEDs are integrated in an unpackaged, bare die form as it reduces cost, footprint...
conference paper 2012
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van den Ende, D.A. (author), van Kempen, S.E. (author), Wu, X. (author), Groen, W.A. (author), Randall, C.A. (author), van der Zwaag, S. (author)
Piezoelectric composites were prepared by dielectrophoretic alignment of high aspect ratio piezoelectric particles in a thermosetting polymer matrix. A high level of alignment was achieved in the cured composite from a resin containing randomly oriented high aspect ratio particles. Upon application of an electric field during curing of the resin...
article 2012
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van den Brand, J. (author), Kusters, R.H.L. (author), Cauwe, M. (author), van den Ende, D.A. (author), Erinc, M. (author)
Low cost large area flexible electronic products are expected to be used in a wide range of applications and in large quantities in our society. Examples of this include sensor packages added to food or conformal intelligent patches that monitor a patient's well-being. Because of their large area, the preferred substrate material for these...
conference paper 2011
document
van den Ende, D.A. (author), Groen, W.A. (author), van der Zwaag, S. (author)
We report on the optimisation of a recently developed high performance 0-3 piezoelectric composite comprising of the piezoelectric Lead Zirconate Titanate (PZT) powder and a liquid crystalline thermosetting matrix polymer (LCT). The matrix polymer is a liquid crystalline polymer comprising of an HBA-HNA backbone with phenylethynyl end-groups....
article 2011
document
van den Ende, D.A. (author), Groen, W.A. (author), van der Zwaag, S. (author), TNO Industrie en Techniek (author)
In this work piezoelectric composite charge based sensors are developed, aimed at quasi-static pressure sensor or switch type applications. The use of piezoelectric composite materials allows for manufacturing robust devices which can easily be integrated with conventional polymer processing. Piezoelectric composites of lead zirconate titanate ...
article 2010
document
Babu, I. (author), van den Ende, D.A. (author), de With, G. (author), TNO Industrie en Techniek (author)
PZT/LCT/PA (lead zirconate titanate Pb(Zr<sub>1-x</sub>Ti <sub>x</sub>)O<sub>3</sub>/Liquid crystalline thermosets/polyamide) composites of 0-3 connectivity were fabricated by hot-pressing. Commercially available PZT powder was calcined at different temperatures for the optimization of the composite properties. The phase transition during...
article 2010
document
van den Ende, D.A. (author), Bory, B.F. (author), Groen, W.A. (author), van der Zwaag, S. (author), TNO Industrie en Techniek (author)
The dielectric and piezoelectric properties of piezoelectric particleepoxy polymer composites structured into 1-3 composites via dielectrophoresis during curing are reported. The dielectrophoretic alignment induces a textured microstructure in the composite, with particles forming chains in the direction of the electric field. The particles form...
conference paper 2010
document
van den Ende, D.A. (author), Bory, B.F. (author), Groen, W.A. (author), van der Zwaag, S. (author), TNO Industrie en Techniek (author)
Composites of piezoelectric particles in a polymer matrix with enhanced properties in the poling direction were prepared by dielectrophoretic alignment of the particles. The effect of processing parameters such as the amplitude and frequency of the applied electric field and the viscosity of the matrix on the dielectric and piezoelectric...
article 2010
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Irimia, D. (author), Dobrikov, D. (author), Kortekaas, R. (author), Voet, H. (author), van den Ende, D.A. (author), Groen, W.A. (author), Janssen, M.H.M. (author), TNO Industrie en Techniek (author)
In this paper we report on the design and operation of a novel piezovalve for the production of short pulsed atomic or molecular beams. The high speed valve operates on the principle of a cantilever piezo. The only moving part, besides the cantilever piezo itself, is a very small O-ring that forms the vacuum seal. The valve can operate...
article 2009
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