Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297810
D. Rouxel, A. Thouvenin, F. Courtout, V. Nguyen, B. Vincent, G. Prieur, É. Velot, N. Merakchi, P. Menu
Bioengineering has become one of the most promising fields in regenerative medicine. Many of its applications have been settled through stem cell research in order to develop innovative stimuli to differentiate the cells into a specific lineage via physical stimulation such as thermal, mechanical or electrical stimuli to avoid the use of biochemical products. Many examples are found in literature, however none of them could provide conclusive answers in this research field. Piezoelectric materials are able to combine mechanical and electrical stimulation. Environments mimicking in vivo conditions are supposed to be the best to induce differentiation process, but these mechanisms are still not fully mastered and very much dependent on cell type. In this poster, we will introduce the experimental setup used to study the effects of physical (i.e. electrical and/or mechanical) stimulation on human mesenchymal stem cells. An overview of the thought process leading to our project is exposed, as well as a brief bibliographical study of electrical stimulation effects on cells. The emphasis will be focused on the piezoelectric materials used in this project. We selected a nanocomposite material, a copolymer P(VDF-TrFE) matrix charged with ZnO nanoparticles, in order to modulate the mechanical and piezoelectric properties of the matrix as well as to provide a better sticking surface favouring cell adhesion.
{"title":"Stem cells differentiation induced by physical stimulation using piezoelectric nanocomposite material","authors":"D. Rouxel, A. Thouvenin, F. Courtout, V. Nguyen, B. Vincent, G. Prieur, É. Velot, N. Merakchi, P. Menu","doi":"10.1109/ISAF.2012.6297810","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297810","url":null,"abstract":"Bioengineering has become one of the most promising fields in regenerative medicine. Many of its applications have been settled through stem cell research in order to develop innovative stimuli to differentiate the cells into a specific lineage via physical stimulation such as thermal, mechanical or electrical stimuli to avoid the use of biochemical products. Many examples are found in literature, however none of them could provide conclusive answers in this research field. Piezoelectric materials are able to combine mechanical and electrical stimulation. Environments mimicking in vivo conditions are supposed to be the best to induce differentiation process, but these mechanisms are still not fully mastered and very much dependent on cell type. In this poster, we will introduce the experimental setup used to study the effects of physical (i.e. electrical and/or mechanical) stimulation on human mesenchymal stem cells. An overview of the thought process leading to our project is exposed, as well as a brief bibliographical study of electrical stimulation effects on cells. The emphasis will be focused on the piezoelectric materials used in this project. We selected a nanocomposite material, a copolymer P(VDF-TrFE) matrix charged with ZnO nanoparticles, in order to modulate the mechanical and piezoelectric properties of the matrix as well as to provide a better sticking surface favouring cell adhesion.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"32 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87924038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297850
F. Zabotto, A. Gualdi, A. D. de Oliveira, J. Eiras, D. Garcia
The magnetic field dependence of the magnetodielectric effect of (1-x)PMN-PT/xCFO particulate composites was systematically investigated. At room temperature, it was found there is a giant magnetodielectric response up to 10% around the electromechanical resonance frequency for a magnetic field of 15kOe. Additionally, at low magnetic fields a positive magnetodielectric coefficient (~2%) associated to the magnetoelectric coupling polarization and dependent of the CFO concentration was observed.
{"title":"Magnetodielectric properties of (1−x)PMN-PT/xCFO particulate composites","authors":"F. Zabotto, A. Gualdi, A. D. de Oliveira, J. Eiras, D. Garcia","doi":"10.1109/ISAF.2012.6297850","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297850","url":null,"abstract":"The magnetic field dependence of the magnetodielectric effect of (1-x)PMN-PT/xCFO particulate composites was systematically investigated. At room temperature, it was found there is a giant magnetodielectric response up to 10% around the electromechanical resonance frequency for a magnetic field of 15kOe. Additionally, at low magnetic fields a positive magnetodielectric coefficient (~2%) associated to the magnetoelectric coupling polarization and dependent of the CFO concentration was observed.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"130 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88016114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297742
M. Połomska, B. Hilczer, Ewa Markiewicz, Zbigniew Trybuła, Bartłomiej Andrzejewski, I. S. Wiza, Adam Pietraszko
Dielectric response, thermal and magnetic properties of hot-pressed ceramics obtained from Cd2Nb2O7 nanopowders synthesized by high-energy milling of CdO and Nb2O5 were studied. The transition from cubic to orthorhombic phase was found to be shifted downwards by ~50 K in comparison with that reported for single crystals. Below 150 K four relaxation processes were revealed and characterized. A broad specific heat anomaly with maximum at 18K, similar to that reported for single crystals was observed. Small magnetic hysteresis loop observed for the ceramics at 4 K can be due to defects introduced in the process of mechanical synthesis.
{"title":"XRD, dielectric and magnetic studies of Cd2Nb2O7 ceramics obtained from mechano-synthesized nanopowders","authors":"M. Połomska, B. Hilczer, Ewa Markiewicz, Zbigniew Trybuła, Bartłomiej Andrzejewski, I. S. Wiza, Adam Pietraszko","doi":"10.1109/ISAF.2012.6297742","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297742","url":null,"abstract":"Dielectric response, thermal and magnetic properties of hot-pressed ceramics obtained from Cd2Nb2O7 nanopowders synthesized by high-energy milling of CdO and Nb2O5 were studied. The transition from cubic to orthorhombic phase was found to be shifted downwards by ~50 K in comparison with that reported for single crystals. Below 150 K four relaxation processes were revealed and characterized. A broad specific heat anomaly with maximum at 18K, similar to that reported for single crystals was observed. Small magnetic hysteresis loop observed for the ceramics at 4 K can be due to defects introduced in the process of mechanical synthesis.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"29 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88111083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297820
Morad Etier, Yaling Gao, V. Shvartsman, D. Lupascu, J. Landers, Heiko Wende
We have successfully synthesized CoFe2O4/BaTiO3 composite nanoparticles with core-shell structure using a new organosol crystallization method. The weight fraction of the ferroelectric and the ferrimagnetic phase was 80% and 20%, respectively. The nanopowders were sintered to form a ceramic composite. The ceramics exhibits the magnetoelectric effect. The value of the converse magnetoelectric coefficient αc measured by a modified SQUID susceptometer reaches 4.4·10-12 s·m-1 at the magnetic field μ0Hdc = 0.15 T and T = 285 K.
{"title":"Magnetoelectric properties of 0.2CoFe2O4-0.8BaTiO3 composite prepared by organic method","authors":"Morad Etier, Yaling Gao, V. Shvartsman, D. Lupascu, J. Landers, Heiko Wende","doi":"10.1109/ISAF.2012.6297820","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297820","url":null,"abstract":"We have successfully synthesized CoFe<sub>2</sub>O<sub>4</sub>/BaTiO<sub>3</sub> composite nanoparticles with core-shell structure using a new organosol crystallization method. The weight fraction of the ferroelectric and the ferrimagnetic phase was 80% and 20%, respectively. The nanopowders were sintered to form a ceramic composite. The ceramics exhibits the magnetoelectric effect. The value of the converse magnetoelectric coefficient α<sub>c</sub> measured by a modified SQUID susceptometer reaches 4.4·10<sup>-12</sup> s·m<sup>-1</sup> at the magnetic field μ<sub>0</sub>H<sub>dc</sub> = 0.15 T and T = 285 K.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"7 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90540437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297783
A. V. Blazhevich, I. Raevski, S. P. Kubrin, E. Sitalo, S. I. Raevskaya, V. V. Titov, D. Sarychev, M. A. Malitskaya, I. Zakharchenko
Dielectric, X-ray, piezoelectric and Mossbauer studies of highly-resistive Li-doped (1-x)PbFe0.5Ta0.5O3-(x)PbTiO3 ceramics from the 0<; x <;0.3 range fabricated by solid state synthesis and usual sintering have been carried out. Addition of PbTiO3 to PbFe0.5Ta0.5O3 increases the temperature Tm of the permittivity maximum, decreases the diffusion of this maximum and lowers the Neel temperature TN. However above a certain compositional threshold fast lowering of TN stops and a new magnetic state with comparatively high (~50 K) transition temperature becomes stable in a rather wide compositional range.
{"title":"Ferroelectric and magnetic phase transitions in multiferroic PbFe0.5Ta0.5O3-PbTiO3 solid solutions","authors":"A. V. Blazhevich, I. Raevski, S. P. Kubrin, E. Sitalo, S. I. Raevskaya, V. V. Titov, D. Sarychev, M. A. Malitskaya, I. Zakharchenko","doi":"10.1109/ISAF.2012.6297783","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297783","url":null,"abstract":"Dielectric, X-ray, piezoelectric and Mossbauer studies of highly-resistive Li-doped (1-x)PbFe<sub>0.5</sub>Ta<sub>0.5</sub>O<sub>3</sub>-(x)PbTiO<sub>3</sub> ceramics from the 0<; x <;0.3 range fabricated by solid state synthesis and usual sintering have been carried out. Addition of PbTiO<sub>3</sub> to PbFe<sub>0.5</sub>Ta<sub>0.5</sub>O<sub>3</sub> increases the temperature T<sub>m</sub> of the permittivity maximum, decreases the diffusion of this maximum and lowers the Neel temperature T<sub>N</sub>. However above a certain compositional threshold fast lowering of T<sub>N</sub> stops and a new magnetic state with comparatively high (~50 K) transition temperature becomes stable in a rather wide compositional range.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"8 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76201229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297793
X. Vendrell, L. Mestres, O. Raymond, D. A. Ochoa, J. García
Lead-free (K0.5Na0.5)1-3xLaxNbO3 (x = 0.0-0.005) thin films were synthesized by chemical solution deposition. The X-ray analysis showed that (K0.5Na0.5)NbO3 (KNN) and La doped KNN single-phase thin films were obtained with a [100] preferred orientation. When doping with La, thin films exhibited a remarkably low leakage current and higher dielectric properties.
{"title":"Highly oriented La doped (K, Na)NbO3 ferroelectric thin films","authors":"X. Vendrell, L. Mestres, O. Raymond, D. A. Ochoa, J. García","doi":"10.1109/ISAF.2012.6297793","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297793","url":null,"abstract":"Lead-free (K<sub>0.5</sub>Na<sub>0.5</sub>)<sub>1-3x</sub>La<sub>x</sub>NbO<sub>3</sub> (x = 0.0-0.005) thin films were synthesized by chemical solution deposition. The X-ray analysis showed that (K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub> (KNN) and La doped KNN single-phase thin films were obtained with a [100] preferred orientation. When doping with La, thin films exhibited a remarkably low leakage current and higher dielectric properties.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"37 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75641871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297750
K. H. Baek, S. Hong, Se Bin Kim, Jeong Hun Kim, T. Sung
This paper describes an efficient method for piezoelectric energy harvesting (PEH) system from impact forces using an array of piezoelectric modules. Specifically, the rectifier circuit and array configuration are considered. It is shown that rectifying the signal from each piezoelectric module separately generates more energy and charges a capacitor faster than using a single rectifier for all modules connected in series. In addition, the array can be designed such that the modules are impacted simultaneously or sequentially with a phase difference. We show that the latter allows faster energy harvesting. These results could be used in the design of efficient impact-based PEH system.
{"title":"Rectifier and structural design for efficient energy harvesting system from impact-based piezoelectric array","authors":"K. H. Baek, S. Hong, Se Bin Kim, Jeong Hun Kim, T. Sung","doi":"10.1109/ISAF.2012.6297750","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297750","url":null,"abstract":"This paper describes an efficient method for piezoelectric energy harvesting (PEH) system from impact forces using an array of piezoelectric modules. Specifically, the rectifier circuit and array configuration are considered. It is shown that rectifying the signal from each piezoelectric module separately generates more energy and charges a capacitor faster than using a single rectifier for all modules connected in series. In addition, the array can be designed such that the modules are impacted simultaneously or sequentially with a phase difference. We show that the latter allows faster energy harvesting. These results could be used in the design of efficient impact-based PEH system.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"45 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79847699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297816
M. Palizdar, T. Comyn, S. Poterala, G. Messing, E. Suvacı, A. Kleppe, A. J. Jephcoat, A. Bell
The solid solution between bismuth ferrite and lead titanate (xBiFeO3-(1-x)PbTiO3 or BFPT) possesses a morphotropic phase boundary (MPB) between the rhombohedral and tetragonal forms at x=0.7. It is of interest to investigate the influence of field-driven rhombohedral-tetragonal phase transitions across the MPB, to determine whether correctly oriented BFPT can provide both giant piezoelectric properties and significant magnetoelectric coupling. Here, we used the reactive templated grain growth (RTGG) technique to prepare crystallographically textured 0.6BiFeO3-0.4PbTiO3 (60:40 BFPT) ceramics. Both Aurivillius structure templates (Bi4Ti3O12 and PbBi4Ti4O15) and perovskite templates (BaTiO3 and SrTiO3) were used to prepare textured 60:40BFPT. Synchrotron radiation experiments were used to determine the degree of texture. A current data suggests that only BaTiO3 templates survive the sintering process, and other candidate template materials reacted with the 60:40BFPT matrix at high temperature. In the case of SrTiO3, this reaction results in a low Curie temperature (Tc = 350°C) due to the substitution of Sr2+. Aurivillius templates resulted in high Curie temperatures (610°C) and may be chemically suitable if they could be stabilized during the sintering process. However, the resulting ceramics show low remanent polarization (Pr = 3 μc/cm2), while SrTiO3 and BaTiO3 templated ceramics show higher remanent polarizations of 36 and 30 μc/cm2, respectively. Because of their high chemical stability in this system, BaTiO3 templates appear to be the best candidate for fabricating textured BFPT by the TGG method, displaying a high degree of crystallographic texture.
{"title":"Synchrotron texture analysis of thick BiFeO3-PbTiO3 layers synthesised by tape casting using Aurivillius and non-Aurivillius templates","authors":"M. Palizdar, T. Comyn, S. Poterala, G. Messing, E. Suvacı, A. Kleppe, A. J. Jephcoat, A. Bell","doi":"10.1109/ISAF.2012.6297816","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297816","url":null,"abstract":"The solid solution between bismuth ferrite and lead titanate (xBiFeO<sub>3</sub>-(1-x)PbTiO<sub>3</sub> or BFPT) possesses a morphotropic phase boundary (MPB) between the rhombohedral and tetragonal forms at x=0.7. It is of interest to investigate the influence of field-driven rhombohedral-tetragonal phase transitions across the MPB, to determine whether correctly oriented BFPT can provide both giant piezoelectric properties and significant magnetoelectric coupling. Here, we used the reactive templated grain growth (RTGG) technique to prepare crystallographically textured 0.6BiFeO<sub>3</sub>-0.4PbTiO<sub>3</sub> (60:40 BFPT) ceramics. Both Aurivillius structure templates (Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub> and PbBi<sub>4</sub>Ti<sub>4</sub>O<sub>15</sub>) and perovskite templates (BaTiO<sub>3</sub> and SrTiO<sub>3</sub>) were used to prepare textured 60:40BFPT. Synchrotron radiation experiments were used to determine the degree of texture. A current data suggests that only BaTiO<sub>3</sub> templates survive the sintering process, and other candidate template materials reacted with the 60:40BFPT matrix at high temperature. In the case of SrTiO<sub>3</sub>, this reaction results in a low Curie temperature (T<sub>c</sub> = 350°C) due to the substitution of Sr<sup>2+</sup>. Aurivillius templates resulted in high Curie temperatures (610°C) and may be chemically suitable if they could be stabilized during the sintering process. However, the resulting ceramics show low remanent polarization (P<sub>r</sub> = 3 μc/cm<sup>2</sup>), while SrTiO<sub>3</sub> and BaTiO<sub>3</sub> templated ceramics show higher remanent polarizations of 36 and 30 μc/cm<sup>2</sup>, respectively. Because of their high chemical stability in this system, BaTiO<sub>3</sub> templates appear to be the best candidate for fabricating textured BFPT by the TGG method, displaying a high degree of crystallographic texture.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"44 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84120142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297860
I. Rychetský, A. Klíč
Finite element method together with the spectral representation provide efficient tools for calculation of effective permittivity of 2-component samples. Using this method several samples very studied. It was shown that the grainy samples are well described by the rational functions with few geometric modes, while the samples with strongly irregular clusters are better described by the Lichtenecker-type expressions.
{"title":"Dielectric properties of grainy composites studied by finite element method","authors":"I. Rychetský, A. Klíč","doi":"10.1109/ISAF.2012.6297860","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297860","url":null,"abstract":"Finite element method together with the spectral representation provide efficient tools for calculation of effective permittivity of 2-component samples. Using this method several samples very studied. It was shown that the grainy samples are well described by the rational functions with few geometric modes, while the samples with strongly irregular clusters are better described by the Lichtenecker-type expressions.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"12 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84363941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-09DOI: 10.1109/ISAF.2012.6297748
C. Yang, D. Song, M. S. Woo, S. Hong, K. H. Baek, T. Sung
We designed a piezoelectric energy harvesting system that can shift the resonant frequency to match the fixed external energy frequency. A permanent magnet (10 × 10 × 5 mm3) was attached to the free end of a cantilever beam, and a permanent magnet was attached to each of the four faces of a rotor at 90° angles. The effect of the size of the permanent magnets (40 × 20 × 10 mm3, 30 × 20 × 10 mm3, and 20 × 20 × 10 mm3) and the effect of the pole array distribution (NNNN, SSSS, NSNS, and NNSS) were experimentally investigated. The optimum conditions were determined by testing various distances between the magnets at different rpm's. The experiments showed that the maximum output power was generated for the minimum distance and largest magnet. The most effective approach to adjust the resonance frequency was to change the pole arrays of the magnets attached to the rotor. Furthermore, the optimum conditions were determined at each distance by changing the pole array and rpm. Software simulations support the experimental results.
{"title":"Design of vibration exciter by using permanent magnets for application to piezoelectric energy harvesting","authors":"C. Yang, D. Song, M. S. Woo, S. Hong, K. H. Baek, T. Sung","doi":"10.1109/ISAF.2012.6297748","DOIUrl":"https://doi.org/10.1109/ISAF.2012.6297748","url":null,"abstract":"We designed a piezoelectric energy harvesting system that can shift the resonant frequency to match the fixed external energy frequency. A permanent magnet (10 × 10 × 5 mm3) was attached to the free end of a cantilever beam, and a permanent magnet was attached to each of the four faces of a rotor at 90° angles. The effect of the size of the permanent magnets (40 × 20 × 10 mm3, 30 × 20 × 10 mm3, and 20 × 20 × 10 mm3) and the effect of the pole array distribution (NNNN, SSSS, NSNS, and NNSS) were experimentally investigated. The optimum conditions were determined by testing various distances between the magnets at different rpm's. The experiments showed that the maximum output power was generated for the minimum distance and largest magnet. The most effective approach to adjust the resonance frequency was to change the pole arrays of the magnets attached to the rotor. Furthermore, the optimum conditions were determined at each distance by changing the pole array and rpm. Software simulations support the experimental results.","PeriodicalId":20497,"journal":{"name":"Proceedings of ISAF-ECAPD-PFM 2012","volume":"15 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84394199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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