The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Fei Wang - One of the best experts on this subject based on the ideXlab platform.
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Electret material enhanced triboelectric energy harvesting from air flow for self powered wireless temperature sensor network
Sensors and Actuators A-physical, 2018Co-Authors: Yingchun Wu, Fei Wang, Yushen Hu, Ziyu HuangAbstract:Abstract Energy from wind flow is very common in ambient environment which can be harvested by triboelectric generator effectively. Herein, Electret based triboelectric generator (E-TriG) with both electrostatic and triboelectric effects are investigated with enhanced performance comparing with the traditional triboelectric generator based on only contact electrification. Electret materials like PTFE, CYTOP, TOPAS, and COC are prepared with different methods and charged under positive or negative conditions to optimize the material property. It is proved that the performance of the triboelectric generator can be improved by negatively charged Electrets, while with positively charged Electrets, the power output is weakened. As a demonstration, the E-TriG has been successfully applied for wireless temperature sensing. At a wind flow rate of 18 m/s, a storage capacitor can be fully charged by three E-TriGs devices within 15 s, and afterwards, wireless temperature signal could be read and delivered to the internet every 5 s. An average power of 400 μW is therefore harvested. With enhanced performance from the corona charged Electret, the triboelectric generator shows promising application for the future wireless sensor networks.
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Electret materials for enhanced performance of triboelectric energy scavenging from wind flow
2017 19th International Conference on Solid-State Sensors Actuators and Microsystems (TRANSDUCERS), 2017Co-Authors: Yingchun Wu, Yushen Hu, Ziyu Huang, Zhuoteng Peng, Xinxin Li, Fei WangAbstract:This paper reports the application of Electret materials on triboelectric generator for enhanced performance comparing to the traditional nanogenerator simply based on contact electrification. Various Electrets like PTFE film, TOPAS, CYTOP and COC were prepared and charged under different conditions to explore the optimal output. It is proved that the performance of the triboelectric generator can be improved by negatively charged Electrets, while with positively charged Electrets, the performance is weakened. We have also demonstrated the application of the generator in a self-powered wireless temperature sensor network scavenging energy from wind in the central air-conditioning system.
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Spray coating of polymer Electret with nano particles for stable surface charge
2016 IEEE 11th Annual International Conference on Nano Micro Engineered and Molecular Systems (NEMS), 2016Co-Authors: Yixin Xu, Ai Zhang, Yulong Zhang, Kai Wang, Fei WangAbstract:In this paper, we have proposed a spray coating method for Electret material deposition. With this method, the thickness of Electret can be well controlled and the surface potential of the charged Electret can be improved comparing to the traditional spin coated polymer Electrets. Furthermore, we have added some polystyrene nano particles into the Electret, which can improve the surface charge stability of the Electret at high temperature or in high humidity environment. We have also confirmed that our new Electret could be used in the energy harvesting devices and may have promising applications on other MEMS devices.
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Inorganic Electret with enhanced charge stability for energy harvesting
The 8th Annual IEEE International Conference on Nano Micro Engineered and Molecular Systems, 2013Co-Authors: Fei Wang, Ole HansenAbstract:We report a new surface treatment of inorganic Electret materials which enhances the charge stability. Coating the surfaces with 1H, 1H, 2H, 2H - perfluorodecyltrichlorosilane (FDTS) makes the Electret surface more hydrophobic which improves the surface charge stability under high humidity conditions. Thermal tests show that the thermal stability of charge in the inorganic Electrets is also much better than that of polymer materials such as CYTOP. A demonstrator device with SiO2 Electrets shows promising results for energy harvesting applications.
Tracy Hudson - One of the best experts on this subject based on the ideXlab platform.
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In situ wafer-level polarization of Electret films in MEMS acoustic sensor arrays
Sensors and Actuators A: Physical, 2012Co-Authors: Michael Kranz, M.g. Allen, Tracy HudsonAbstract:Polymer Electrets, polymers with a quasi-permanent electrostatic polarization, are commonly employed in a macro-scale form factor within transducers such as the Electret condenser microphone. In addition, MEMS-based Electret transduction has been reported for both acoustic sensors and energy harvesters. In these micro-devices, the polymer film is typically polarized prior to assembly into the device. Common techniques employed in MEMS Electret polarization include corona discharge and backlighted thyratron, with wafer-bonding and simple stacked assemblies being employed to perform the actual assembly and integration. In contrast, this paper reports a method for post-release in situ polarization of Electret films within a MEMS device. The method utilizes microplasma discharges with self-aligned charging grids integrated within the device to charge fluoropolymer films in a fashion similar to the corona discharge technique. This in situ approach enables the integration of uncharged Electret films into MEMS and subsequent post-fabrication charging, simultaneously enabling the formation of buried or encapsulated Electrets as well as eliminating the need to restrict fabrication processes that might otherwise discharge pre-charged Electret materials. The method is applied to a single-chip array of ultrasonic sensors designed to capture and analyze waveforms from impacts. ?? 2011 Elsevier B.V. All rights reserved.
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In situ wafer-level polarization of Electret films in MEMS acoustic sensor arrays
2011 16th International Solid-State Sensors Actuators and Microsystems Conference, 2011Co-Authors: Michael Kranz, M.g. Allen, Tracy HudsonAbstract:MEMS-based Electret transduction has been reported for both acoustic sensors and energy harvesters. Common techniques employed in MEMS Electret formation include corona discharge and backlighted thyratron. This paper reports a method for post-release in situ polarization of Electret films within a MEMS device. The method utilizes microplasma discharges with self-aligned charging grids integrated within the device to charge fluoropolymer films in a fashion similar to the corona discharge technique. This in situ approach enables the integration of uncharged Electret films into MEMS and subsequent post-fabrication charging, simultaneously enabling the formation of buried or encapsulated Electrets as well as eliminating the need to restrict fabrication processes that might otherwise discharge pre-charged Electret materials. The method is applied to a single-chip array of acoustic sensors designed to capture and analyze waveforms from impacts.
Michael Kranz - One of the best experts on this subject based on the ideXlab platform.
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In situ wafer-level polarization of Electret films in MEMS acoustic sensor arrays
Sensors and Actuators A: Physical, 2012Co-Authors: Michael Kranz, M.g. Allen, Tracy HudsonAbstract:Polymer Electrets, polymers with a quasi-permanent electrostatic polarization, are commonly employed in a macro-scale form factor within transducers such as the Electret condenser microphone. In addition, MEMS-based Electret transduction has been reported for both acoustic sensors and energy harvesters. In these micro-devices, the polymer film is typically polarized prior to assembly into the device. Common techniques employed in MEMS Electret polarization include corona discharge and backlighted thyratron, with wafer-bonding and simple stacked assemblies being employed to perform the actual assembly and integration. In contrast, this paper reports a method for post-release in situ polarization of Electret films within a MEMS device. The method utilizes microplasma discharges with self-aligned charging grids integrated within the device to charge fluoropolymer films in a fashion similar to the corona discharge technique. This in situ approach enables the integration of uncharged Electret films into MEMS and subsequent post-fabrication charging, simultaneously enabling the formation of buried or encapsulated Electrets as well as eliminating the need to restrict fabrication processes that might otherwise discharge pre-charged Electret materials. The method is applied to a single-chip array of ultrasonic sensors designed to capture and analyze waveforms from impacts. ?? 2011 Elsevier B.V. All rights reserved.
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In situ wafer-level polarization of Electret films in MEMS acoustic sensor arrays
2011 16th International Solid-State Sensors Actuators and Microsystems Conference, 2011Co-Authors: Michael Kranz, M.g. Allen, Tracy HudsonAbstract:MEMS-based Electret transduction has been reported for both acoustic sensors and energy harvesters. Common techniques employed in MEMS Electret formation include corona discharge and backlighted thyratron. This paper reports a method for post-release in situ polarization of Electret films within a MEMS device. The method utilizes microplasma discharges with self-aligned charging grids integrated within the device to charge fluoropolymer films in a fashion similar to the corona discharge technique. This in situ approach enables the integration of uncharged Electret films into MEMS and subsequent post-fabrication charging, simultaneously enabling the formation of buried or encapsulated Electrets as well as eliminating the need to restrict fabrication processes that might otherwise discharge pre-charged Electret materials. The method is applied to a single-chip array of acoustic sensors designed to capture and analyze waveforms from impacts.
J. Jiang - One of the best experts on this subject based on the ideXlab platform.
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The combinational effect of PP Electret and monoolein on transdermal delivery of cyclosporine A in vitro
Journal of Electrostatics, 2013Co-Authors: Yuanyuan Liang, Lin Ma, J. JiangAbstract:Abstract In this study, single and combined enhancing effect of polypropylene (PP) Electret and 10% monoolein (Mono) on cyclosporine A (CsA) transdermal delivery were studied using improved Franz diffusion cell and high performance liquid chromatography (HPLC) technique. Single use of each PP Electret or 10% Mono could enhance the transdermal delivery of CsA. +500 V or −500 V corona charged Electret in combination with 10% Mono had the most significant enhancing effect. The PP Electrets with the same corona voltage in absolute value had the similar enhancing effect on transdermal delivery of CsA when they were used in combination with Mono.
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Evaluation of penetration enhancement of lidocaine by porous PTFE/PE/PP Electret through mouse skin in vitro
2005 12th International Symposium on Electrets, 2005Co-Authors: J. Jiang, Mao-hai Song, G.d. Li, X.p. WangAbstract:The main object of this study was to systemically evaluate the effect of porous PTFE/PE/PP Electret on lidocaine transdermal delivery and to compare its enhancing effect with some commonly used chemical permeation enhancers, that is propylene glycol, oleic acid and menthol. The composite Electret was prepared by heat melting method at 130/spl square/. The modified Franz diffusion cell was used to carry out the in vitro permeation experiment and a high performance liquid chromatography (HPLC) was employed to analyze the drug concentration. The drug solution containing no chemical permeation enhancer or no Electret application was taken as control group. The results indicated that: (1) The feasibility of using porous PTFE/PE/PP Electret to enhance the lidocaine transdermal delivery was achieved by applying positively charged Electrets with different surface potentials. The enhancing effect was proportional to the surface potential of the Electret. (2) The chemical permeation enhancers used were shown to be less effective than the +1000 V Electret on lidocaine transdermal permeation. The 24 hour's cumulated permeation amount of lidocaine reached to 3.649, 6.029, 8.619, 6.330 and 17.218 mg for control group, 10% oleic acid, 20% propylene glycol, 1% menthol and porous PTFE/PE/PP Electret, respectively. In conclusion, positively charged Electret can be used as the enhancer to increase the transdermal permeation of lidocaine.
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evaluation of penetration enhancement of lidocaine by porous ptfe pe pp Electret through mouse skin in vitro
International Symposium on Electrets, 2005Co-Authors: J. Jiang, Mao-hai Song, G.d. Li, X.p. WangAbstract:The main object of this study was to systemically evaluate the effect of porous PTFE/PE/PP Electret on lidocaine transdermal delivery and to compare its enhancing effect with some commonly used chemical permeation enhancers, that is propylene glycol, oleic acid and menthol. The composite Electret was prepared by heat melting method at 130/spl square/. The modified Franz diffusion cell was used to carry out the in vitro permeation experiment and a high performance liquid chromatography (HPLC) was employed to analyze the drug concentration. The drug solution containing no chemical permeation enhancer or no Electret application was taken as control group. The results indicated that: (1) The feasibility of using porous PTFE/PE/PP Electret to enhance the lidocaine transdermal delivery was achieved by applying positively charged Electrets with different surface potentials. The enhancing effect was proportional to the surface potential of the Electret. (2) The chemical permeation enhancers used were shown to be less effective than the +1000 V Electret on lidocaine transdermal permeation. The 24 hour's cumulated permeation amount of lidocaine reached to 3.649, 6.029, 8.619, 6.330 and 17.218 mg for control group, 10% oleic acid, 20% propylene glycol, 1% menthol and porous PTFE/PE/PP Electret, respectively. In conclusion, positively charged Electret can be used as the enhancer to increase the transdermal permeation of lidocaine.
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In vivo study of percutaneous absorption of lidocaine using Electret in the rat
Proceedings. 11th International Symposium on Electrets, 2002Co-Authors: J. Jiang, C.r. Song, W.q. Zhao, D. WeiquanAbstract:The present work was undertaken to study the effect of Electret on transdermal drug delivery in vivo. The experiment was carried out in depilated abdominal rat skin using lidocaine hydrochloride as a model compound. Rats were divided into control and Electret group. The Electrets were applied on the drug in a vial and the blood samples were taken from jugular vein at predetermined time intervals. The concentration of lidocaine in plasma was measured by high proficiency liquid chromatograph (HPLC) after extraction. The plasma lidocaine concentration was significantly increased in Electret group. The results suggested that Electret could promote the permeability of drug by its effect on the structure of epidermis and blood flow change.
M.g. Allen - One of the best experts on this subject based on the ideXlab platform.
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In situ wafer-level polarization of Electret films in MEMS acoustic sensor arrays
Sensors and Actuators A: Physical, 2012Co-Authors: Michael Kranz, M.g. Allen, Tracy HudsonAbstract:Polymer Electrets, polymers with a quasi-permanent electrostatic polarization, are commonly employed in a macro-scale form factor within transducers such as the Electret condenser microphone. In addition, MEMS-based Electret transduction has been reported for both acoustic sensors and energy harvesters. In these micro-devices, the polymer film is typically polarized prior to assembly into the device. Common techniques employed in MEMS Electret polarization include corona discharge and backlighted thyratron, with wafer-bonding and simple stacked assemblies being employed to perform the actual assembly and integration. In contrast, this paper reports a method for post-release in situ polarization of Electret films within a MEMS device. The method utilizes microplasma discharges with self-aligned charging grids integrated within the device to charge fluoropolymer films in a fashion similar to the corona discharge technique. This in situ approach enables the integration of uncharged Electret films into MEMS and subsequent post-fabrication charging, simultaneously enabling the formation of buried or encapsulated Electrets as well as eliminating the need to restrict fabrication processes that might otherwise discharge pre-charged Electret materials. The method is applied to a single-chip array of ultrasonic sensors designed to capture and analyze waveforms from impacts. ?? 2011 Elsevier B.V. All rights reserved.
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In situ wafer-level polarization of Electret films in MEMS acoustic sensor arrays
2011 16th International Solid-State Sensors Actuators and Microsystems Conference, 2011Co-Authors: Michael Kranz, M.g. Allen, Tracy HudsonAbstract:MEMS-based Electret transduction has been reported for both acoustic sensors and energy harvesters. Common techniques employed in MEMS Electret formation include corona discharge and backlighted thyratron. This paper reports a method for post-release in situ polarization of Electret films within a MEMS device. The method utilizes microplasma discharges with self-aligned charging grids integrated within the device to charge fluoropolymer films in a fashion similar to the corona discharge technique. This in situ approach enables the integration of uncharged Electret films into MEMS and subsequent post-fabrication charging, simultaneously enabling the formation of buried or encapsulated Electrets as well as eliminating the need to restrict fabrication processes that might otherwise discharge pre-charged Electret materials. The method is applied to a single-chip array of acoustic sensors designed to capture and analyze waveforms from impacts.