• Title/Summary/Keyword: EAPap

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Wirelessly Driven Cellulose Electro-Active Paper Actuator: Application Research (원격구동 셀룰로오스 종이 작동기의 응용연구)

  • Kim, Jae-Hwan;Yang, Sang-Yeol;Jang, Sang-Dong;Ko, Hyun-U;Mun, Sung-Cheol;Kim, Dong-Gu;Kang, Jin-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.5
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    • pp.539-543
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    • 2012
  • Cellulose Electro-Active Paper (EAPap) is attractive as a biomimetic actuator because of its merits: it is lightweight, operates in dry conditions, has a large displacement output, has a low actuation voltage, and has low power consumption. Cellulose is regenerated so as to align its microfibrils, which results in a piezoelectric paper. When chemically bonded and mixed with carbon nanotubes, titanium oxide, zinc oxide, tin oxides, the cellulose EAPap can be used as a hybrid nanocomposite that has versatile properties and that can meet the requirements of many application devices. This paper presents trends in recent research on the cellulose EAPap, mainly on material preparation and its use in devices, including biosensors, chemical sensors, flexible transistors, and actuators. This paper also explains wirelessly driving technology for the cellulose EAPap, which is attractive for use in biomimetic robotics and micro-aerial vehicles.

Green Energy Harvester using a Piezoelectric Regenerated Paper (압전종이를 이용한 그린에너지 하베스터)

  • Koh, Hyun-Woo;Kwon, Yeon-Ho;Yun, Gyu-Young;Kim, Joo-Hyung;Kim, Jae-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.198-201
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    • 2009
  • Due to piezoelectric property of regenerated cellulose paper, a green energy harvester using an electro-active paper (EAPap) was studied. In order to design the green energy harvester, we simulated cymbal type energy harvesting structures for single and multi-stacked layers of EAPap films. From the simulation, the optimized material orientation, thickness of harvesting structure was selected. By measuring of the induced output voltage by applying stress on energy harvester will be explained in detail. Therefore we propose the feasibility of the nature-friendly piezoelectric EAPap as a new green energy harvesting material.

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Electromechanical Simulation of Cellulose Based Biomimetic Electro-Active Paper (생체모방종이작동기(Electro-Active Paper)의 전기기계적인 구동 시뮬레이션)

  • Jang, Sang-Dong;Kim, Heung-Soo;Kim, Jae-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.73-76
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    • 2007
  • Electro-Active paper (EAPap) is a new smart material that has a potential to be used in biomimetic actuator and sensor. It is made by cellulose that is abundant material in nature. EAPap is fascinating with its biodegradability, lightweight, large displacement, high mechanical strength and low actuation voltage. Actuating mechanism of EAPap is known to be the combined effects of ion migration and piezoelectricity. However, the electromechanical actuation mechanisms are not yet to be established. This paper presents the modeling of the actuation behavior of water infused cellulose samples and their composite dielectric constants calculated by Maxwell-Wagner theory. Electro-mechanical forces were calculated using Maxwell stress tensor method. Bending deflection was evaluated from simple beam model and compared with experimental observation, which result good correlation with each other.

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Electromechanical Simulation of Cellulose Based Biomimetic Electro-Active Paper (생체모방 종이작동기(electro-active paper)의 전기기계적인 구동 시뮬레이션)

  • Jang, Sang-Dong;Kim, Jae-Hwan;Kim, Heung-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.12
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    • pp.1179-1183
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    • 2007
  • Electro-Active paper(EAPap) is a new smart material that has a potential to be used in biomimetic actuator and sensor. It is made by cellulose that is abundant material in nature. EAPap is fascinating with its biodegradability, lightweight, large displacement, high mechanical strength and low actuation voltage. Actuating mechanism of EAPap is known to be the combined effects of ion migration and piezoelectricity. However, the electromechanical actuation mechanisms are not yet to be established. This paper presents the modeling of the actuation behavior of water infused cellulose samples and their composite dielectric constants calculated by Maxwell-Wagner theory. Electro-mechanical forces were calculated using Maxwell stress tensor method. Bending deflection was evaluated from simple beam model and compared with experimental observation, and which result in good correlation with each other.

Study on Electro-Mechanical Coupling Effect of EAPap Actuator

  • Zhao, Lijie;Li, Yuanxie;Kim, Heung-Soo;Kim, Jae-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.05a
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    • pp.640-643
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    • 2006
  • In this paper, electro-mechanical coupling of cellulose-based Electro-Active Paper (EAPap) actuator is investigated by measuring induced strain and mechanical properties with and without electric excitation. The maximum induced in-plane strain is measured at the orientation angle of 45? samples. The elastic modulus and strength of EAPap are increased with electric excitation and the orientation angle of $45^{\circ}$ samples shows the largest increment of mechanical properties. From the observations, shear piezoelectricity is considered as the major piezoelectric mode of EAPap.

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Cellulose based Electro-Active Paper Actuator: Materials and Applications (셀룰로오스 기반 Electro-Active Paper 작동기: 재료 및 응용)

  • Jang, Sang-Dong;Yang, Sang-Yeol;Ko, Hyun-U;Kim, Dong-Gu;Mun, Sung-Chul;Kang, Jin-Ho;Jung, Hye-Jun;Kim, Jae-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.11
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    • pp.1227-1233
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    • 2011
  • Cellulose Electro-Active Paper (EAPap) has been known as a new smart material that is attractive for a bio-mimetic actuator due to its merits in terms of lightweight, dry condition, large displacement output, low actuation voltage and low power consumption. Cellulose EAPap is made by regenerating cellulose and aligning its micro-fibrils. This paper introduces several EAPap materials, which are based on natural cellulose and its hybrid nanocomposites mixed/blended with inorganic functional materials. By chemically bonding and mixing with carbon nanotubes and inorganic nanoparticles, the cellulose EAPap can be a hybrid nanocomposite that has versatile properties and can meet material requirements for many applications. Recent research trend of the cellulose EAPap is introduced in terms of material preparations as well as application devices including actuators, temperature and humidity sensors, biosensors, chemical sensors, and so on. This paper also explains wirelessly driving technology for the cellulose EAPap, which is attractive for bio-mimetic robotics, surveillance and micro-aerial vehicles.

Fabrication and Characterization of Cellulose Electro-Active Paper with Increased Thickness (두께를 증가시킨 셀룰로오스 Electro-Active Paper 의 제조와 특성평가)

  • Kim, Ki-Baek;Jung, Hyejun;Kim, Jaehwan
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.2
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    • pp.241-246
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    • 2013
  • This paper reports fabrication and characterization of cellulose Electro-Active Paper (EAPap) with increased thickness. Usual thickness of cellulose EAPap was $15{\mu}m$. This thickness needs to be increased to enhance the mechanical force output of EAPap. To fabricate thick cellulose EAPap, the fabrication process parameters including casting and drying processes should be investigated. In this paper, the casting thickness is increased from $800{\mu}m$ to $1500{\mu}m$, and heating times on a hot plate before and after curing process are introduced at 40 and $60^{\circ}C$ for 30 and 60 minutes, respectively. Thickness measurement, Thermal Gravitational Analysis (TGA), UV-transmittance, Young's modulus, and piezoelectric charge constant are measured. Heated EAPaps with increased thickness have similar TGA result, higher transmittance, higher Young's modulus and lower piezoelectric charge constant.

Improved performance of PEDOT:PSS/pentacene Schottky diode on EAPap (셀룰로우스 기반의 EAPap 작동기의 PEDOT_PSS/Pentacene를 이용한 Schottky diode 성능 개선)

  • Lim, Hyun-Kyu;Cho, Ki-Youn;Kang, Kwang-Sun;Kim, Jae-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.77-81
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    • 2007
  • Pentacene was dissolved in N-methyspyrrolidone (NMP) and mixed with poly(3,4-ethylenedioxythiophene), poly(styrenesulfonate) (PEDOT:PSS). The solution color changed from deep purple to intense yellow. As the dissolution time increased, visible absorption decreased and ultraviolet (UV) absorption increased. PEDOT:PSS or Pentacene-PEDOT:PSS was spin-coated to control the layer thickness. Three-layered Schottky diodes consisting of Al, PEDOT:PSS or PEDOT:PSS-pentacene, and Au with thickness of 300nm, respectively, were fabricated. The current densities of $4.8{\mu}A/cm^2$ at 2.5MV/m and $660{\mu}A/cm^2$ at 1.9MV/m were obtained for the Au/PEDOT:PSS/Al and Au/Pentacene-PEDOT:PSS/Al Schottky diodes, respectively. The current density of the Schottky diode was enhanced by about two orders of magnitude by doping pentacene to PEDOT:PSS.

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