• Title, Summary, Keyword: Fiber electrode

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Computational Design of Electrode Networks for Preferentially Aligned Short Fiber Composite Component Fabrication via Dielectrophoresis

  • Srisawadi, Sasitorn;Cormier, Denis R.;Harrysson, Ola L.A.;Modak, Sayantan
    • International Journal of CAD/CAM
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    • v.12 no.1
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    • pp.20-28
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    • 2012
  • Finite Element Analysis (FEA) is often used to identify local stress/strain concentrations where a component is likely to fail. In order to reduce the degree of strain concentration, component thickness can be increased in those regions, or a stronger material can be used. In short fiber reinforced composite materials, strength and stiffness can be increased through proper fiber alignment. The field-aided microtailoring (FAiMTa) process is one promising method for doing this. FAiMTa uses principles of dielectrophoresis to preferentially align particles or fibers within a matrix. To achieve the preferred fiber orientation, an interdigitated electrode network must be integrated into the mold halves which can be fabricated by additive manufacturing (AM) processes. However, the process of determining the preferred fiber arrangements and electrode locations can be very challenging. This paper presents algorithms to semi-automate the interdigitated electrode design process. The algorithm has been implemented in the Solidworks CAD system and is demonstrated in this paper.

Nonenzymatic Sensor Based on a Carbon Fiber Electrode Modified with Boron-Doped Diamond for Detection of Glucose (보론 도핑 다이아몬드로 표면처리된 탄소섬유 기반의 글루코스 검출용 비효소적 바이오센서)

  • Song, Min-Jung
    • Korean Chemical Engineering Research
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    • v.57 no.5
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    • pp.606-610
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    • 2019
  • In this study, we demonstrated that the nonenzymatic glucose sensor based on the flexible carbon fiber bundle electrode with BDD nanocomposites (CF-BDD electrode). As a nano seeding method for the deposition of BDD on flexible carbon fiber, electrostatic self-assembly technique was employed. Surface morphology of BDD coated carbon fiber electrode was observed by scanning electron microscopy. And the electrochemical characteristics were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. This CF-BDD electrode exhibited a large surface area, a direct electron transfer between the redox species and the electrode surface and a high catalytic activity, resulting in a wider linear range (3.75~50 mM), a faster response time (within 3 s) and a higher sensitivity (388.8 nA/mM) in comparison to a bare CF electrode. As a durable and flexible electrochemical sensing electrode, this brand new CF-BDD scheme has promising advantages on various electrochemical and wearable sensor applications.

Particle collection characteristics of carbon fiber sheet discharge electrode by particle size and application to air cleaner (탄소섬유 시트 방전극의 입자 크기 별 집진 특성 및 공기청정기로의 응용)

  • shin, Dongho;Woo, Chang Gyu;Hong, Keejung;Kim, Hak-Joon;Kim, Yong-Jin;Han, Bangwoo
    • Particle and aerosol research
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    • v.14 no.3
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    • pp.81-88
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    • 2018
  • The market for improving the indoor air quality is continuously increasing, and air cleaners are the representative products. As interest in indoor air quality increases, so are the ultrafine particle which are harmful to the human body. Despite its many advantages, electrostatic precipitators are less used in indoor air due to ozone production. In this study, the carbon fiber sheet was applied to the discharge electrode and compared with the conventional tungsten wire discharge electrode. The particle collection efficiency and the amount of ozone generation were measured for 10-100 nm particles. Furthermore, it was applied to commercial air purifier with electrostatic precipitator to compare particle removal performance. The carbon fiber sheet type discharge electrode generates a small amount of ozone, and thus it can be applied to improve indoor air quality.

Preparation of Conductive Nanoweb through Electrospinning Followed by Electroless Silver-Plating and Its Application as Dry-Type Electrode for ECG Measurement (전기방사에 이은 무전해 은도금을 통한 전도성 나노 섬유 웹의 제조와 ECG 측정용 건식 전극으로의 응용)

  • Ahn, Yu-Jin;Yoon, Sun;Kim, Kap-Jin
    • Textile Science and Engineering
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    • v.49 no.1
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    • pp.47-55
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    • 2012
  • In order to prepare a flexible dry-type electrode for electrocadiogram (ECG), conductive poly(vinylidene fluoride) [PVDF] was electrospun and silver-plated electrolessly. The surface morphology and the mechanical and electrical properties of the silver-plated nanowebs prepared under different plating conditions were evaluated. After silverplating, the prepared web was welded ultrasonically in order to improve the conductivity and the rubbing fastness. Dry-type electrodes were fabricated into eyelet shape by using the ultrasonically welded silver-plated PVDF nanoweb, a sponge and a metal eyelet. Then, it was attached to a commercial sports brassiere top. The ECG of the wearer of the top was measured by the newly developed electrodes and the commercial Ag/AgCl gel electrodes while walking and running. The comparison reveals that the silver-plated PVDF nanowebs can be used as an electrode for ECG measurement.

Preparation and Characterization of PAN-based Carbon Felt for Electrode (PAN계 전극용 탄소 펠트 제조 및 특성 평가)

  • Choi, Da Hee;Lee, Jae-Chul;Kim, Ki-Young
    • Textile Science and Engineering
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    • v.56 no.3
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    • pp.171-176
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    • 2019
  • In this paper, carbon felt was produced by carbonizing and graphitizing Oxi-PAN fiber (oxidized polyacrylonitrile fiber, stabilized fiber) nonwoven fabric. The physical, mechanical and electrical properties of the carbon felt produced in this way were compared with those of commercialized carbon fiber felt for conventional Redox Flow Battery. As the GSM of Oxi-PAN increased, the porosity and pore size decreased. The GSM after carbonization of the prepared Oxi-PAN felt sample was reduced by about 40%, but the differences according to the carbonization and graphitization temperature conditions showed little change in all the basic characteristics except electrical resistivity and tensile characteristics. The specific resistivity was reduced to $1.25{\Omega}{\cdot}mm$ at $2000^{\circ}C$ compared to about $2.05{\Omega}{\cdot}mm$ at $1000^{\circ}C$ based on the Oxi-PAN 900 GSM sample. Compared with commercial products, carbon felt made with Oxi-PAN 900 GSM is considered to be the best electrode.

Studies on Electrode Integrated Piezoelectric Polyvinylidene difluoride(PVDF) Fiber (전극 일체형 polyvinylidene difluoride(PVDF) 압전 섬유에 관한 연구)

  • Lee, Se Young;Kim, Seul Bi;Choi, Se Jin;Bang, Ju Yup;Kim, Han Seong
    • Textile Science and Engineering
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    • v.53 no.4
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    • pp.279-284
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    • 2016
  • Polyvinylidene difluoride solution dip-coating and a high-voltage poling process is effective at inducing chain reorientation and phase transformation. Moreover, a copper wire external electrode and coated fiber combined to form a piezoelectric device successfully. In addition, a textile-like piezoelectric device comprising of three warps and one weft was fabricated, and the piezoelectric properties of the device were evaluated. The voltage from the polyvinylidene difluoride fiber was increased as the external force was applied. The piezoelectric performance was affected by the presence of external load resistors. Moreover, in the case of the textile-type piezoelectric device, the more warps and weft were connected to each other, the higher was the voltage generated. Consequently, single fiber can be used for piezoelectric devices, moreover, it enables advanced users to have wide application, for example, woven or knitted smart textile-type sensors or micro energy harvesters.

Electroless Nickel Plating on Fibers for the Highly Porous Electrode

  • Cheon, So-Young;Park, So-Yeon;Rhym, Young-Mok;Kim, Doo-Hyun;Koo, Yeon-Soo;Lee, Jae-Ho
    • Journal of Electrochemical Science and Technology
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    • v.1 no.2
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    • pp.117-120
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    • 2010
  • Materials used as fuel cell electrode should be light, high conductive, high surface area for reaction, catalytic surface and uniformity of porous structure. Nickel is widely used in electrode materials because it itself has catalytic properties. When used as electrode materials, nickel of only a few im on the surface may be sufficient to conduct the catalytic role. To manufacture the nickel with porous structure, Electroless nickel plating on carbon fiber be conducted. Because electroless nickel plating is possible to do uniform coating on the surface of substrate with complex shape. Acidic bath and alkaline bathe were used in electroless nickel plating bath, and pH and temperature of bath were controlled. The rate of electroless plating in alkaline bath was faster than that in acidic bath. As increasing pH and temperature, the rate of electrolee plating was increased. The content of phosphorous in nickel deposit was higher in acidic bath than that in alkaline bath. As a result, the uniform nickel deposit on porous carbon fiber was conducted.

Characteristics of Photoresist-derived Carbon Nanofibers for Li-ion Full Cell Electrode

  • Kim, Hwan-Jun;Joo, Young-Hee;Lee, Sang-Min;Kim, Chang-Il
    • Transactions on Electrical and Electronic Materials
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    • v.15 no.5
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    • pp.265-269
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    • 2014
  • Carbon nanofiber electrode has been fabricated for energy storage systems by the electrospinning of SU-8 precursor and subsequent pyrolysis. Various parameters including the applied voltage, the distance between syringe tip and target collector and the flow rate of the polymer affect the diameter of SU-8 electrospun nanofibers. Shrinkage during pyrolysis decreases the fiber diameter. As the pyrolysis temperature increases, the resistivity decreases dramatically. Low resistivity is one of the important characteristics of the electrodes of an energy storage device. Given the advantages of carbon nanofibers having high external surface area, electrical conductivity, and lithium intercalation ability, SU-8 derived carbon nanofibers were applied to the anode of a full lithium ion cell. In this paper, we studied the physical properties of carbon fiber electrode by scanning transmission microscopy, thermal gravimetric analysis, and four-point probe. The electrochemical characteristics of the electrode were investigated by cyclic voltammogram and electrochemical impedance spectroscopy plots.

Novel design of interdigitated electrodes for piezoelectric transducers

  • Jemai, Ahmed;Najar, Fehmi
    • Smart Structures and Systems
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    • v.22 no.4
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    • pp.369-382
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    • 2018
  • Novel design of interdigitated electrodes capable of increasing the performance of piezoelectric transducers are proposed. The new electrodes' geometry improve the electromechanical coupling by offering an enhanced adaptation of the electric field to the interdigitated electrode configuration. The proposed analysis is based on finite element modeling and takes into account local polarization effect. It is shown that the proposed electrodes considerably increase the strain generation compared to flat electrode arrangement used for Macro Fiber Composite (MFC) and Active Fiber Composite (AFC) actuators. Also, electric field singularities are reduced allowing better reliability of the transducer against electric failure.