W.A. Groen (Pim)
| Dr. Pim Groen Fax: +31 (0)15 2784472
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Biography In 1987 I graduated at Leiden University on the field of Solid State Chemistry working on crystal structures of perovskites. Hereafter I worked two years as AIO2 also in Leiden. I did my PhD in 1990 in the field of ceramic superconductors. I joined Philips Research in 1989 where I worked in Eindhoven on inorganic materials for electronic applications and later in Aachen (Germany) on electronic ceramics, including piezoelectric ceramics. When Philips stopped its activities in the field of passive components I joined Morgan Electroceramics R&D manager in 2002 where I was responsible for projects with customers to implement piezo-technology into their products. Furthermore, I led a project on a new production line for the making of multilayer piezoelectric actuators. Since januari 2008, I am department head of the group Materials Performance at TNO Science and Industry. In 2009, I joined the Novel Aerospace Materials (NOVAM) group as a visiting scientist starting new activities in the field of Smart Materials & Sensors.
Current projects Novel concepts for Piezoelectric composites in sensor devices Piezoelectric sensors offer tremendous benefits for many sensing applications, by being able to convert mechanical energy to electrical. Applications range from pressure switches to damage detection systems. In addition piezoelectric materials are well suited as electrical energy generators (power harvesting systems). State-of-the-art piezoelectric materials such as PZT ceramics and PVDF polymers posses several drawbacks in other areas, which limits their use as successful sensor and energy scavenger materials. Piezoelectric composites have the potential of overcoming many of these drawbacks, but generally suffer from compromised piezoelectric properties, ultimately lowering the output signal. Novel concepts are being explored to exploit the composites advantages, while employing novel techniques to increase piezoelectric signal output from these materials to a higher level. An important topic in the aviation industry is Structural Health Monitoring. Currently, the safety of airplanes is secured by inspections at regular intervals which are optical or by ultrasound. In the ideal case, sensors for SHM will be build into the airframe and connected to a network. In case of difficult to reach places wireless sensors will be incorporated in the structural system. However, the lifetime of such systems is limited by the lifetime of the batteries which are used to power these systems. Solution for this can be found by energy scavenging or harvesting systems. Part of these systems are also based on piezoelectric materials by the application is still very limited. Both energy harvesting systems and sensors for SHM will be part of the new research.
In the past I published 51 publications in peer reviewed journals, 12 conference proceeding contributions and 18 patent applications mainly in the field of ceramics, lighting and sensors
2009 D. Irimia, D. Dobrikov, R. Kortekaas, H. Voet, D.A. van den Ende, W.A. Groen, and M.H.M. Janssen, A short pulse (7 µs FWHM) and high repetition rate (dc-5kHz) cantilever piezovalve for pulsed atomic and molecular beams, Rev. Sci. Instr. 80, 113303 (2009)
D.A. van den Ende, B. Bos, W.A. Groen, L.J.M.G. Dortmans, Lifetime of piezoceramic multilayer actuators: Interplay of material properties and actuator design, J. Electroceram. 22 (1-3), pp. 163-170 (2009)
D.A. van den Ende, B. Bos, W.A. Groen, Non-linear electromechanical behaviour of piezoelectric bimorph actuators: Influence on performance and lifetime, J. Electroceram. 22 (1-3), pp. 185-191 (2009)
2001-2008 W.A. Groen, C. Metzmacher, P. Huppertz and S. Schuurman , Aging of NTC Ceramics in the system Mn-Ni-Fe-O, Journal of Electroceramics 7, 77 (2001).
H.A.M. van Hal, W.A. Groen, S. Maassen W.C. Keur, Mechanochemical synthesis of BaTiO3, Bi0.5Na0.5TiO3 and Ba2NaNb5O15 dielectric ceramics, J. Europ.Ceram. Soc. 21, 1689 (2001).
W.A. Groen, C. Metzmacher, V. Zaspalis, P. Huppertz and S. Schuurman , Aging of NTC Ceramics in the system Mn-Ni-Fe-O, Eur. J. Ceram Soc. 21, 1793 (2001).
M.D. Snel, W.A. Groen and G. de With, Investigation of the piezoelectric system
M.D. Snel, W.A. Groen and G. de With, New piezoelectric ceramics in system
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