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Multilayered electret films based triboelectric nanogenerator

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Nano Research 2016年第5期9卷 1442-1451页

作者： Tao Zhou Limin Zhang Fei Xue Wei Tang Chi Zhang Zhong Lin wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences National Center for Nanoscience and Technology Beijing 100083 China School of Material Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA

A triboelectric nanogenerator （TENG） is a simple and cost effective device that converts ambient mechanical energy into electricity based on the surface contact electrification of thin films. The limited surface charge density may affect the overall performance of the TENG. In this paper, a novel electret film based TENG （E-TENG） fabricated by corona charging is proposed that greatly enhances the effective surface charge density of the thin films as compared to those subjected to contact electrification. The short-circuit current, transferred electric charge density, and open-circuit voltage of the E-TENG have been investigated, using different corona charging voltages, pinpoint distances and times in order to explore the optimum experimental conditions. The short-circuit current, transferred electric charge density, and open-circuit voltage of the E-TENG are found to be about seven times larger than those of the ordinary polytetrafluoroethylene （PTFE） film based TENG. Based on corona charging, several multilayered E-TENGs have been fabricated, and the short-circuit current, transferred electric charge density, and open-circuit voltage of the E-TENGs with different number of layers are studied for achieving optimal performances. This work offers an effective approach for improving the effective surface charge density and thereby increasing the output capability of the TENG, which would greatly promote TENG applications in self-powered portable electronics and sensor networks.

关键词： triboelectric nanogenerator electret thin film corona charging energy harvesting

Research and development of micro electret power generators

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Science China(Technological Sciences) 2012年第3期55卷 581-587页

作者： YANG ZhaoHui WANG Jing ZHANG JinWen National Key Laboratory of Nano/Micro Fabrication Technology Institute of MicroelectronicsPeking UniversityBeijing 100871China

As the size of the electronic system continuously reduces, characteristics of small volume, light weight, high energy it is very important to develop micro power generator, which has density and continuous energy supplying. Vibration energy exists widely in daily environment. Micro vibration power generator can harvest and exchange the vibration energy to the electrical energy. Micro electret power generator is one kind of the power generators for harvesting vibration energy and has been paid much attention by researchers. This paper describes the development and status of micro electret power generators, including electret materials and charging methods, vibration energy harvesting structures and conversion efficiency improvement.

关键词： electret micro power generator vibration energy harvesting

Remodeling Electrophysiological Microenvironment for Promoting Bone Defect Repair via electret Hybrid Electrospun Fibrous Mat

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Advanced Fiber Materials 2024年第6期6卷 1855-1873页

作者： Jinjie Cui Bin Yu Dejian Li Zeyu Fu Xiuyi Yang Lingyong Jiang Xudong Wang Kaili Lin Department of Oral and Cranio‑Maxillofacial Surgery College of StomatologyNational Center for StomatologyNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of StomatologyResearch Unit of Oral and Maxillofacial Regenerative MedicineShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineChinese Academy of Medical SciencesShanghai 200011China State Key Lab for Modification of Chemical Fibers&Polymer Materials College of Material Science&EngineeringDonghua UniversityShanghai 201620China Department of Orthodontics The Affiliated Stomatological Hospital of Soochow UniversitySuzhou Stomatological HospitalSuzhou 215005China

Improving the osteogenic properties of bone grafts plays a critical role in the repair and functional restoration of critical-sized bone *** endogenous electric field,one of the most crucial physiological signals,has been confirmed to maintain physiological function and reconstruct the structure of bone,which is inadequate in bone defect *** for the devel-opment of electroactive osteogenic biomaterials arise to remodel and promote the electrophysiological *** the electroactive materials,electret biomaterials can provide a stable and persistent endogenous electrical stimulation,which better conforms to the physiological microenvironment and has long-term effectiveness in the bone repair ***,an electret hybrid electrospun fibrous mat(EHFM)was developed to mimic the structure of the natural extracellular matrix(ECM)with a suitable and persistent electrophysiological *** EHFM was constructed with a core-shell structure,in which silicon dioxide electrets were loaded in the core-layer to remodel and maintain the electrical microenvironment over the long *** EHFM significantly promoted the osteogenesis of bone mesenchymal stem cells(BMSCs)in vitro and showed remarkable ability in bone repair,which was three times better than that of the control group in a critical-sized rat calvarial defect ***,it was verified that EHFM-derived osteogenesis was related to the activation of the calcium ion-sensing receptor(CaSR),while increasing intracellular calcium ion concentration of *** study puts forward a novel engineering strategy to promote bone defect repair by remodeling a stable and persistent electrophysiological microenvironment,showing potential for clinical applications.

关键词： electret Electrophysiological microenvironment Osteogenesis Electrospun fibrous mat

Inhibiting scar formation via wearable multilayer stacked electret patch:Self-creation of persistent and customizable DC electric field for fibrogenic activity restriction

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InfoMat 2024年第3期6卷 66-80页

作者： Sung-Won Kim Sumin Cho Donghan Lee Jiyu Hyun Sunmin Jang Inwoo Seo Hyun Su Park Hee Jae Hwang Hyung-Seop Han Dae Hyeok Yang Heung Jae Chun Suk Ho Bhang Dongwhi Choi School of Chemical Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityYonginGyeonggiRepublic of Korea Biomaterials Research Center Biomedical Research DivisionKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea Department of Medical Life Sciences College of MedicineInstitute of Cell and Tissue EngineeringThe Catholic University of KoreaSeoulRepublic of Korea

Electrical stimulation has recently received attention as noninvasive treatment in skin wound healing with its outstanding biological property for clinical ***,the complexity of equipment for applying appropriate electrical stimulation remains an ongoing ***,we proposed a strategy for skin scar inhibition by providing electrical stimulation via a multilayer stacked electret(MS-electret),which can generate direct current(DC)electric field(EF)without any power supply *** addition,the MS-electret can easily control the intensity of EFs by simply stacking electret layers and maintain stable EF with the surface potential of 3400 V over 5 days owing to the injected charges on the electret *** confirmed inhibition of type 1 collagen andα-SMA expression of human dermal fibroblasts(hDFs)by 90%and 44%in vitro,indicating that the transition of hDFs to myofibroblasts was restricted by applying stable electrical *** further revealed a 20%significant decrease in the ratio of myofibroblasts caused by the MS-electret in *** findings present that the MS-electret is an outstanding candidate for effective skin scar inhibition with a battery-free,physiological electrical microenvironment,and noninvasive treatment that allows it to prevent external infection.

关键词： DC electric field dermal fibroblasts electret scar formation restriction self-creation of electrical stimulation

Optimization of Out-of-Plane Vibration Energy Harvesters Employing electret

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Journal of Beijing Institute of Technology 2017年第3期26卷 304-310页

作者： Chunhui Gao Shiqiao Gao Haipeng Liu Lei Jin Junhu Lu School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China

This paper investigated the dependence of out-of-plane electret-based vibration energy harvesters’output power,frequency bandwidth,and resonance frequency on surface charge density and load *** the external acceleration amplitude and electret size were held constant,the following results are predicted by the numerical investigation：（1）An optimum value exists in the surface charge density to maximize the output *** the surface charge density is increasing,electrostatic forces are enhanced,which emphasizes that the soft spring effect widens the frequency bandwidth and lowers the resonance frequency.（2）Different surface charge densities correspond to different optimum initial air gaps,resonance frequency,and optimum load resistance.（3）With the attenuation of the surface potential,the output power,frequency drift,and frequency bandwidth decreased.（4）An optimum value exists in the load resistance to maximize the output *** the load resistance is decreasing,electrostatic force is enhanced,which lowers the resonance frequency.（5）A maximum frequency bandwidth exists with further load resistance increasing,and the initial air gap is smaller,the greater the frequency bandwidth.

关键词： electret optimum surface charge density load resistance

Multi-block electret-based mechanical antenna model for low frequency communication

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第5期10卷 143-155页

作者： Bowen Liang Yong Cui Xiao Song Liangya Li Chen Wang School of Automation Science and Electrical Engineering Beihang University BeijingP.R.China

In an LF/VLF transmission system,the performance of the antenna is of great importance to the entire ***,the electret-based mechanical LF/VLF antenna uses mechanical movement to accelerate electret charges to produce LF/VLF electromagnetic waves,and the frequency of these electromagnetic waves is limited by the rotation speed of the actuating *** on research that addressed the relationship between antenna structure and electromagnetic wave frequency,this paper—in order to increase the frequency of electromagnetic waves—alters the charge distribution mode of the mechanical antenna while keeping the motor’s rotational speed constant to realize an increase of transmission signal *** effectiveness of this method was verified by model simulation.

关键词： electret LF/VLF antenna model magnetic field computing

EFFECT OF electret ON TRANSDERMAL PERMEATION OF MELOXICAM FROM A PATCH FORMULATION

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EFFECT OF ELECTRET ON TRANSDERMAL PERMEATION OF MELOXICAM FR...

A New Electrostatic Generator Driven by Only an Electric Field of an electret

The 6th International Conference on Applied Electrostatics

作者： Jiang Jian~1,Kong Yuxiu~2,Cheng Liang~1,Hou Xuemei~2,Liang Yuanyuan~1,Wang Dong~2,Xiao Yongheng~2, Cui Lili~(2*) Department of Physics and Mathematics,Faculty of Basic Medical Sciences,Second Military Medical University,Shanghai,200433,China Department of Inorganic Chemistry,School of Pharmacy,Second Military Medical University,Shanghai, 200433,China

In this study,the effect of electret and 10%ethyl oleate on meloxicam skin permeation was studied by improved Franz diffusion cell,UV measurement and HPLC analysis. The results indicated that electret had better enhancing effect on the skin permeation of meloxicam than that of 10%ethyl ***, electret and 10%ethyl oleate had an incorporative effect that could lead to a stable transdermal flux of meloxicam of 6.531μg/cm·h and 79%of the drug permeating through the skin after applying the patch on skin for ***:electret meloxicam patch had better transdermal enhancing effect.

关键词： electret meloxicam transdennal delivery patch

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Journal of Electromagnetic Analysis and Applications 2021年第12期13卷 161-171页

作者： Katsuo Sakai Electrostatic Generator Laboratory Yokohama Japan

Today, the sun is a very useful source of energy because it continuously radiates energy. An electron is radiating energy continuously, too. A new electrostatic generating method using this electric field energy from electrons as a driving force of charge carriers was invented, and its success was presented on ESA 2017 and ESA 2019. This new electrostatic generator was realized by asymmetric electrostatic force, which is a new phenomenon. Unfortunately, its experimental success rate was rare. Therefore, the cause was searched by many experiments. Finally, it became apparent that the acceleration force of the charge carrier was not stronger than the deceleration force of the charge carrier with this experimental equipment. Therefore, the electrode arrangement of this equipment was improved. As a result, the acceleration force was increased, and the deceleration force was decreased. Then, the experimental success rate became 100%.

关键词： Electrostatic Generator electret Asymmetric Electrostatic Force Charge Carrier Asymmetric Shape Charged Conductor

Evaluations of dielectric property and drug release profile of 5-FU patches based on plasma charged electrets

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Plasma Science and Technology 2018年第5期20卷 110-116页

作者：苑旺梁合鹃黄平安晓强江键崔黎丽 Department of Physics and Mathematics College of Basic Medical SciencesSecond Military Medical University Department of Inorganic Chemistry School of PharmacySecond Military Medical University

In the present study,the electret 5-fluorouracil patch was developed,the effective surface potential,piezoelectric coefficient d33,open-circuit thermally stimulated discharge（TSD） current spectra and shear adhesion of the patch were *** drug release profile of the patch was determined by using high performance liquid chromatography method.A stable potential difference which was positively dependent on the surface potential of the electret was generated on two sides of the *** measurements of d33 coefficient,TSD current spectra and adhesion performance showed that the electrostatic field of the electret could cause polarization and cohesive strength decreasing of the matrix molecules,change the distribution and interaction of the drug molecules in patch,therefore to increase the release of drug from the transdermal patch.

关键词： electret hypertrophic scar thermally stimulated discharge current 5-fluorouracil,patch piezoelectric coefficient