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Hehenberger, S.P. (author), Caizzone, Stefano (author), Yarovoy, Alexander (author)The utilization of additive manufacturing (AM) to engineer the permittivity profile of dielectric resonator antennas (DRAs) is considered. For the first time, the capabilities of AM are exploited to create continuously swept permittivity profiles and applied to cylindrical DRAs. The spatial variant lattices (SVL) synthesis algorithm is...journal article 2023
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Hehenberger, Simon P. (author), Caizzone, Stefano (author), Thurner, Stefan (author), Yarovoy, Alexander (author)Frequency-dependent dielectric properties of 3-D-printed structured dielectrics (dielectric crystals) with engineered effective permittivity for micro-and mmWave applications are studied. Different modeling and measurement techniques for broadband dielectric properties of such 3-D-printed crystals are reviewed, their tradeoffs discussed, and...journal article 2023
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Leijsen, R.L. (author), Brink-van Caspel, W.M. (author), At Van Den Berg, Cornelis (author), Webb, A. (author), Remis, R.F. (author)Electrical properties tomography (EPT) is an imaging method that uses a magnetic resonance (MR) system to non-invasively determine the spatial distribution of the conductivity and permittivity of the imaged object. This manuscript starts by providing clear definitions about the data required for, and acquired in, EPT, followed by comprehensively...journal article 2021
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Adla, Soham (author), Rai, Neeraj Kumar (author), Karumanchi, Sri Harsha (author), Tripathi, Shivam (author), Disse, Markus (author), Pande, S. (author)Soil volumetric water content (VWC) is a vital parameter to understand several ecohydrological and environmental processes. Its cost-effective measurement can potentially drive various technological tools to promote data-driven sustainable agriculture through supplemental irrigation solutions, the lack of which has contributed to severe...journal article 2020
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Leijsen, R.L. (author), van den Berg, Cornelis (author), Webb, A. (author), Remis, R.F. (author), Mandija, Stefano (author)Magnetic resonance electrical properties tomography (MR-EPT) is a technique used to estimate the conductivity and permittivity of tissues from MR measurements of the transmit magnetic field. Different reconstruction methods are available; however, all these methods present several limitations, which hamper the clinical applicability. Standard...journal article 2019
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van Gemert, J.H.F. (author), Brink, Wyger (author), Webb, A. (author), Remis, R.F. (author)Purpose: High-permittivity materials in the form of flexible “dielectric pads” have proved very useful for addressing RF inhomogeneities in high field MRI systems. Finding the optimal design of such pads is, however, a tedious task, reducing the impact of this technique. We present an easy-to-use software tool which allows researchers and...journal article 2019
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van Gemert, J.H.F. (author), Brink, Wyger M. (author), Remis, R.F. (author), Webb, A. (author)PURPOSE: One of the main concerns in fetal MRI is the radiofrequency power that is absorbed both by the mother and the fetus. Passive shimming using high permittivity materials in the form of "dielectric pads" has previously been shown to increase the formula presented efficiency and homogeneity in different applications, while reducing the...journal article 2019
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van Gemert, J.H.F. (author), Brink, W.M. (author), Webb, A. (author), Remis, R.F. (author)Inhomogeneities in the transmit radio frequency magnetic field ( {\text{B}}-{1}^{+} ) reduce the quality of magnetic resonance (MR) images. This quality can be improved by using high-permittivity pads that tailor the {\text{B}}-{1}^{+} fields. The design of an optimal pad is application-specific and not straightforward and would therefore...journal article 2018
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Vlachogiannakis, G. (author), Pertijs, M.A.P. (author), Spirito, M. (author), de Vreede, L.C.N. (author)A compact sensing pixel for the determination of the localized complex permittivity at microwave frequencies is proposed. Implemented in the 40-nm CMOS, the architecture comprises a square patch, interfaced to the material-under-test sample, that provides permittivity-dependent admittance. The patch admittance is read out by embedding the patch...journal article 2018
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Chassagne, C. (author), Dubois, Emmanuelle (author), Jiménez, María L. (author), Ploeg, J.C. (author), van Turnhout, J. (author)Dielectric spectroscopy can be used to determine the dipole moment of colloidal particles from which important interfacial electrokinetic properties, for instance their zeta potential, can be deduced. Unfortunately, dielectric spectroscopy measurements are hampered by electrode polarization (EP). In this article, we review several procedures...journal article 2016
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Peksa, A.E. (author), Wolf, K.H.A.A. (author), Slob, E.C. (author), Chmura, L.A. (author), Zitha, P.L.J. (author)Bentheimer sandstone is a quartz-rich permeable hard sedimentary rock used for core flooding experiments. When fired to stabilize clays (subjected to high temperatures), pyrometamorphical phase changes induce texture and pore framework alteration. As a consequence the new dielectric response may influence wettability. The literature regarding...journal article 2016
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Fimberger, M. (author), Tsekmes, I.A. (author), Kochetov, R. (author), Smit, J.J. (author), Wiesbrock, F. (author)Poly(2-nonyl-2-oxazoline)80-stat-poly(2-dec-9?-enyl-2-oxazoline)20 and poly(2-dec-9?-enyl-2-oxazoline)100 can be synthesized from the cationic ring-opening polymerization of monomers that can be derived from fatty acids from renewable resources. These (co)poly(2-oxazoline)s can be crosslinked with di- and trifunctional mercapto compounds using...journal article 2015
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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...journal article 2013
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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...journal article 2012
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Kavian, M. (author), Slob, E.C. (author), Mulder, W.A. (author)We measured the electric parameters for four different configurations of unconsolidated homogeneous and layered sands as a function of frequency, water saturation, and salinity under fluid flow conditions. Our objective is to determine if the effect of heterogeneities at scales much smaller than the skin depth can be captured by introducing...journal article 2011
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Jia, Y. (author), Luo, H. (author), Or, S.W. (author), Wang, Y. (author), Chan, H.L.W. (author)Perovskite oxide Pb(Fe1/2Nb1/2)0.52Ti0.48O3 crystals, which were grown using a modified Bridgman method, show a high low-frequency dielectric constant response at room temperature. The Curie phase transition occurs at 523 K. The characteristic frequency of the dielectric dispersion versus the inverse of temperature obeys an Arrhenius relation,...journal article 2009
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Yuan, C.A. (author), Van der Sluis, O. (author), Zhang, G.Q. (author), Ernst, L.J. (author), Van Driel, W.D. (author), Flower, A.E. (author), Van Silfhout, B.R. (author)We propose an amorphous/porous molecular connection network generation algorithm for simulating the material stiffness of a low-k material (SiOC:H). Based on a given concentration of the basic building blocks, this algorithm will generate an approximate and large amorphous network. The molecular topology is obtained by distributing these blocks...journal article 2008
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Plug, W.J. (author), Slob, E. (author), Van Turnhout, J. (author), Bruining, J. (author)The relation between capillary pressure (Pc) and interfacial area has been investigated by measuring Pc and the electric permittivity at 100 kHz simultaneously as function of the water saturation, (Sw). Drainage and imbibition experiments have been conducted for sand-distilled water-gas (CO2/N2) systems. The main capillary cycles and the...journal article 2007
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Plug, W.J. (author), Slob, E.C. (author), Bruining, J. (author), Moreno Tirado, L.M. (author)We present a tool that simultaneously measures the complex permittivity and the capillary pressure characteristics for multiphase flow. The sample holder is a parallel plate capacitor. A precision component analyzer is used to measure the impedance amplitude and phase angle as a function of frequency (1 kHz to 3 MHz). The complex impedance of...journal article 2007
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Stassen, A.F. (author), De Boer, R.W.I. (author), Iosad, N.N. (author), Morpurgo, A.F. (author)We have performed a comparative study of rubrene single-crystal field-effect transistors fabricated using different materials as gate insulator. For all materials, highly reproducible device characteristics are obtained. The achieved reproducibility permits one to observe that the mobility of the charge carriers systematically decreases with...journal article 2004
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