The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform

Pim Groen - One of the best experts on this subject based on the ideXlab platform.

  • Flexible Lead-Free Piezoelectric Composite Materials for Energy Harvesting Applications
    Energy Technology, 2019
    Co-Authors: Vincent L. Stuber, Daniella B. Deutz, David Cannel, Dago M. De Leeuw, Sybrand Van Der Zwaag, James Bennett, Pim Groen
    Abstract:

    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, d33g33, where d33 and g33 are the piezoelectric charge and voltage coefficient. Commonly used piezoelectric materials are based on inorganic ceramics, such as lead zirconium titanate (PZT), as they exhibit high piezoelectric coefficients. However, ceramics are brittle, leading to mechanical failure under large cyclic strains and, furthermore, PZT is classified as a Substance of Very High Concern (SVHC). To circumvent these drawbacks, we fabricated quasi 1–3 potassium sodium lithium niobate (KNLN) ceramic fibers in a flexible polydimethylsiloxane (PDMS) matrix. The fibers were aligned by dielectrophoresis. We demonstrate for the structured composites values of d33g33 approaching 18 pm3 J−1, comparable to that of state-of-the-art ceramic PZT. This relatively high value is due to the reduced inter-particle distance in the direction of the electric field. As a confirmation, the Stored Electrical Energy for both material systems was measured under identical mechanical loading conditions. The similar values for KNLN/PDMS and PZT demonstrate that environmentally friendly, lead-free, mechanically compliant materials can replace state-of-the-art environmentally-less-desirable ceramic materials in piezoelectric vibrational Energy harvesters.

Alexander Rack - One of the best experts on this subject based on the ideXlab platform.

  • multi frame synchrotron radiography of pulsed power driven underwater single wire explosions
    Journal of Applied Physics, 2018
    Co-Authors: D Yanuka, A Rososhek, S Theocharous, S N Bland, Ya E Krasik, Margie P Olbinado, Alexander Rack
    Abstract:

    We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high Energy density physics experiments. Underwater Electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple Stored Electrical Energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this Energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray Energy spectrum. Utilising phase contrast imaging capabilities of the ID19 beamline at the European Synchrotron Radiation Facility, we were able to image both the exploding wire and the shock wave. Probing radiation of 20-50 keV radiographed 200 μm tungsten and copper wires, in ∼2-cm diameter water cylinders with resolutions of 8 μm and 32 μm. The wires were exploded by a ∼30-kA, 500-ns compact pulser, and 128 radiographs, each with a 100-ps X-ray pulse exposure, spaced at 704 ns apart were taken in each experiment. Abel inversion was used to obtain the density profile of the wires, and the results are compared to two dimensional hydrodynamic and one dimensional magnetohydrodynamic simulations.We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high Energy density physics experiments. Underwater Electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple Stored Electrical Energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this Energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray Energy spectrum. Utilising phase contrast imaging capabilities of the ID1...

Vincent L. Stuber - One of the best experts on this subject based on the ideXlab platform.

  • Flexible Lead-Free Piezoelectric Composite Materials for Energy Harvesting Applications
    Energy Technology, 2019
    Co-Authors: Vincent L. Stuber, Daniella B. Deutz, David Cannel, Dago M. De Leeuw, Sybrand Van Der Zwaag, James Bennett, Pim Groen
    Abstract:

    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, d33g33, where d33 and g33 are the piezoelectric charge and voltage coefficient. Commonly used piezoelectric materials are based on inorganic ceramics, such as lead zirconium titanate (PZT), as they exhibit high piezoelectric coefficients. However, ceramics are brittle, leading to mechanical failure under large cyclic strains and, furthermore, PZT is classified as a Substance of Very High Concern (SVHC). To circumvent these drawbacks, we fabricated quasi 1–3 potassium sodium lithium niobate (KNLN) ceramic fibers in a flexible polydimethylsiloxane (PDMS) matrix. The fibers were aligned by dielectrophoresis. We demonstrate for the structured composites values of d33g33 approaching 18 pm3 J−1, comparable to that of state-of-the-art ceramic PZT. This relatively high value is due to the reduced inter-particle distance in the direction of the electric field. As a confirmation, the Stored Electrical Energy for both material systems was measured under identical mechanical loading conditions. The similar values for KNLN/PDMS and PZT demonstrate that environmentally friendly, lead-free, mechanically compliant materials can replace state-of-the-art environmentally-less-desirable ceramic materials in piezoelectric vibrational Energy harvesters.

D Yanuka - One of the best experts on this subject based on the ideXlab platform.

  • multi frame synchrotron radiography of pulsed power driven underwater single wire explosions
    Journal of Applied Physics, 2018
    Co-Authors: D Yanuka, A Rososhek, S Theocharous, S N Bland, Ya E Krasik, Margie P Olbinado, Alexander Rack
    Abstract:

    We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high Energy density physics experiments. Underwater Electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple Stored Electrical Energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this Energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray Energy spectrum. Utilising phase contrast imaging capabilities of the ID19 beamline at the European Synchrotron Radiation Facility, we were able to image both the exploding wire and the shock wave. Probing radiation of 20-50 keV radiographed 200 μm tungsten and copper wires, in ∼2-cm diameter water cylinders with resolutions of 8 μm and 32 μm. The wires were exploded by a ∼30-kA, 500-ns compact pulser, and 128 radiographs, each with a 100-ps X-ray pulse exposure, spaced at 704 ns apart were taken in each experiment. Abel inversion was used to obtain the density profile of the wires, and the results are compared to two dimensional hydrodynamic and one dimensional magnetohydrodynamic simulations.We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high Energy density physics experiments. Underwater Electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple Stored Electrical Energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this Energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray Energy spectrum. Utilising phase contrast imaging capabilities of the ID1...

Ya E Krasik - One of the best experts on this subject based on the ideXlab platform.

  • multi frame synchrotron radiography of pulsed power driven underwater single wire explosions
    Journal of Applied Physics, 2018
    Co-Authors: D Yanuka, A Rososhek, S Theocharous, S N Bland, Ya E Krasik, Margie P Olbinado, Alexander Rack
    Abstract:

    We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high Energy density physics experiments. Underwater Electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple Stored Electrical Energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this Energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray Energy spectrum. Utilising phase contrast imaging capabilities of the ID19 beamline at the European Synchrotron Radiation Facility, we were able to image both the exploding wire and the shock wave. Probing radiation of 20-50 keV radiographed 200 μm tungsten and copper wires, in ∼2-cm diameter water cylinders with resolutions of 8 μm and 32 μm. The wires were exploded by a ∼30-kA, 500-ns compact pulser, and 128 radiographs, each with a 100-ps X-ray pulse exposure, spaced at 704 ns apart were taken in each experiment. Abel inversion was used to obtain the density profile of the wires, and the results are compared to two dimensional hydrodynamic and one dimensional magnetohydrodynamic simulations.We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high Energy density physics experiments. Underwater Electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple Stored Electrical Energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this Energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray Energy spectrum. Utilising phase contrast imaging capabilities of the ID1...

  • Multi frame synchrotron radiography of pulsed power driven underwater single wire explosions
    'AIP Publishing', 2018
    Co-Authors: Yanuka D, S N Bland, Ya E Krasik, Margie P Olbinado, Rososhek A, Theocharous S, Rack A
    Abstract:

    We present the first use of synchrotron-based phase contrast radiography to study pulsed-power driven high Energy density physics experiments. Underwater Electrical wire explosions have become of interest to the wider physics community due to their ability to study material properties at extreme conditions and efficiently couple Stored Electrical Energy into intense shock waves in water. The latter can be shaped to provide convergent implosions, resulting in very high pressures (1-10 Mbar) produced on relatively small pulsed power facilities (100s of kA-MA). Multiple experiments have explored single-wire explosions in water, hoping to understand the underlying physics and better optimize this Energy transfer process; however, diagnostics can be limited. Optical imaging diagnostics are usually obscured by the shock wave itself; and until now, diode-based X-ray radiography has been of relatively low resolution and rather a broad x-ray Energy spectrum. Utilising phase contrast imaging capabilities of the ID19 beamline at the European Synchrotron Radiation Facility, we were able to image both the exploding wire and the shock wave. Probing radiation of 20-50 keV radiographed 200 μm tungsten and copper wires, in ∼2-cm diameter water cylinders with resolutions of 8 μm and 32 μm. The wires were exploded by a ∼30-kA, 500-ns compact pulser, and 128 radiographs, each with a 100-ps X-ray pulse exposure, spaced at 704 ns apart were taken in each experiment. Abel inversion was used to obtain the density profile of the wires, and the results are compared to two dimensional hydrodynamic and one dimensional magnetohydrodynamic simulations