Dr. Kinji Asaka Profile

Dr. Kinji Asaka

Artificial Cell Research Group Leader at Research Organization of Science and Technology

SPIE Involvement:

Author

Publications (39)

Proceedings Article | 9 May 2024 Presentation + Paper

On the time response properties predicted from the exact transfer function of a multiphysics model of IPMC sensors

Kosetsu Ishikawa, Zicai Zhu, Kinji Asaka, Toshiki Hiruta, Kentaro Takagi

Proceedings Volume 12945, 129450F (2024) https://doi.org/10.1117/12.3010269

KEYWORDS: Ionic polymer metal composites, Sensors, Molecules, Matrices, Polymers, Partial differential equations, Deformation, Solids, Protactinium, Electrodes

Read Abstract +

Proceedings Article | 19 May 2020 Paper

Electromechanical modeling of plasticized PVC gel actuators and the improvement in their performances with the additions of ionic liquids

Kinji Asaka, Minoru Hashimoto

Proceedings Volume 11375, 1137511 (2020) https://doi.org/10.1117/12.2557466

KEYWORDS: Actuators, Capacitance, Electrodes, Resistance, Liquids, Electroactive polymers, Performance modeling, Metals, Data modeling, Molecules

Read Abstract +

Proceedings Article | 8 May 2020 Presentation + Paper

On the fluctuation phenomenon of axial thermal stress of a torsional fishing-line artificial muscle (Twisted Polymer Fiber) actuator

Hiroki Iwai, Kentaro Takagi, Chihaya Oiwa, Ken Masuya, Kenji Tahara, Toshihira Irisawa, Masatoshi Shioya, Haruhiko Watanabe, Daichi Sakurai, Kinji Asaka

Proceedings Volume 11375, 113751H (2020) https://doi.org/10.1117/12.2557783

KEYWORDS: Actuators, Polymers, Artificial muscles, Polymeric actuators, Physics, Mathematical modeling, Material characterization

Read Abstract +

Proceedings Article | 24 April 2020 Presentation

Recent studies on simplification of a multi-physics model of IPMC sensors (Conference Presentation)

Kentaro Takagi, Kota Kondo, Zicai Zhu, Kinji Asaka

Proceedings Volume 11378, 113780Y (2020) https://doi.org/10.1117/12.2557806

KEYWORDS: Sensors, Actuators, Polymeric sensors, Polymeric actuators, Polymers, Composites, Humidity, Computer simulations, Complex systems, Computing systems

Read Abstract +

Proceedings Article | 22 April 2020 Paper

Applying IPMC to soft robots

Koichi Suzumori, Hiroyuki Nabae, Kinji Asaka, Tetsuya Horiuchi

Proceedings Volume 11375, 113750A (2020) https://doi.org/10.1117/12.2557021

KEYWORDS: Robots, Actuators, Chemical reactions, 3D printing, Electrodes, Polymers, Robotics, Electroactive polymers, Chemical elements, Polymeric actuators

Read Abstract +

Proceedings Article | 13 March 2019 Paper

Experimental investigation of temperature-dependent hysteresis of fishing-line artificial muscle (twisted and coiled polymer fiber) actuator

Hoshito Tanizaki, Kentaro Takagi, Chihaya Oiwa, Ken Masuya, Kenji Tahara, Toshihira Irisawa, Masatoshi Shioya, Kinji Asaka

Proceedings Volume 10966, 109660U (2019) https://doi.org/10.1117/12.2513834

KEYWORDS: Actuators, Polymers, Artificial muscles, Polymeric actuators

Read Abstract +

Proceedings Article | 13 March 2019 Paper

Finite difference method and finite element method for modeling IPMC sensor voltage

Kota Kondo, Kentaro Takagi, Zicai Zhu, Kinji Asaka

Proceedings Volume 10966, 109661H (2019) https://doi.org/10.1117/12.2514243

KEYWORDS: Finite element methods, Sensors, Finite difference methods, Polymeric sensors, Polymers, Composites, Control systems design

Read Abstract +

Proceedings Article | 27 March 2018 Paper

Gray-box modeling and control of torsional fishing-line artificial muscle actuators

Chihaya Oiwa, Ken Masuya, Kenji Tahara, Toshihira Irisawa, Masatoshi Shioya, Takuma Yamauchi, Eitaro Tanaka, Kinji Asaka, Kentaro Takagi

Proceedings Volume 10594, 1059428 (2018) https://doi.org/10.1117/12.2295899

KEYWORDS: Actuators, Polymers, Artificial muscles, Polymeric actuators, System identification, Control systems, Annealing, Control systems design, Modeling

Read Abstract +

Proceedings Article | 17 April 2017 Paper

Study on simplification of a multi-physical model of IPMC sensor generating voltage as sensing signal

Jun Takeda, Kentaro Takagi, Zicai Zhu, Kinji Asaka

Proceedings Volume 10163, 101632T (2017) https://doi.org/10.1117/12.2258576

KEYWORDS: Systems modeling, Actuators, Sensors, Polymers, Computer simulations, Polymeric sensors, Partial differential equations, Ordinary differential equations, Finite element methods, Electroactive polymers, Modeling and simulation

Read Abstract +

Proceedings Article | 17 April 2017 Paper

Position control of twisted and coiled polymer actuator using a controlled fan for cooling

Kentaro Takagi, Takeshi Arakawa, Jun Takeda, Ken Masuya, Kenji Tahara, Kinji Asaka

Proceedings Volume 10163, 101632V (2017) https://doi.org/10.1117/12.2259766

KEYWORDS: Digital signal processing, HVAC controls, Process control, Actuators, Polymeric actuators, Polymers, Control systems, Artificial muscles, Electroactive polymers, Feedback control, Switching

Read Abstract +

Proceedings Article | 15 April 2016 Presentation + Paper

General thermodynamic theory of the stress-composition interaction for bucky-gel electrochemical actuators

Hyacinthe Randriamahazaka, Kinji Asaka

Proceedings Volume 9798, 97980Z (2016) https://doi.org/10.1117/12.2218807

KEYWORDS: Electrodes, Ions, Chemical analysis, Magnesium

Read Abstract +

Proceedings Article | 15 April 2016 Paper

Position control of fishing line artificial muscles (coiled polymer actuators) from nylon thread

Takeshi Arakawa, Kentaro Takagi, Kenji Tahara, Kinji Asaka

Proceedings Volume 9798, 97982W (2016) https://doi.org/10.1117/12.2218850

KEYWORDS: Actuators, Polymers, Artificial muscles, Polymeric actuators, Electroactive polymers, Control systems design, Control systems, Data modeling, Feedback control, Digital signal processing, Annealing

Read Abstract +

Proceedings Article | 15 April 2016 Paper

A multi-physical model for charge and mass transport in a flexible ionic polymer sensor

Zicai Zhu, Kinji Asaka, Kentaro Takagi, Alvo Aabloo, Tetsuya Horiuchi

Proceedings Volume 9798, 97982O (2016) https://doi.org/10.1117/12.2218238

KEYWORDS: Polymers, Polymeric sensors, Electrodes, Sensors, Composites, Dielectrics, Mechanical sensors, Physics, Systems modeling, Actuators, Diffusion, Molecules

Read Abstract +

Proceedings Article | 1 April 2015 Paper

Measuring blocking force to interpret ionic mechanisms within bucky-gel actuators

Karl Kruusamäe, Takushi Sugino, Kinji Asaka

Proceedings Volume 9430, 94300P (2015) https://doi.org/10.1117/12.2083812

KEYWORDS: Actuators, Ions, Electrodes, Electroactive polymers, Polymers, Liquids, Mathematical modeling, Data modeling, Motion models, Carbon

Read Abstract +

Proceedings Article | 8 March 2014 Paper

The viscoelastic effect in bending bucky-gel actuators

Karl Kruusamäe, Ken Mukai, Takushi Sugino, Kinji Asaka

Proceedings Volume 9056, 90560G (2014) https://doi.org/10.1117/12.2044745

KEYWORDS: Actuators, Polymers, Electrodes, Electroactive polymers, Sensors, Glasses, Liquids, Magnesium, Single walled carbon nanotubes, Carbon nanotubes

Read Abstract +

Electromechanically active polymers (EAP) are considered a good actuator candidate for a variety of reasons, e.g. they are soft, easy to miniaturize and operate without audible noise. The main structural component in EAPs is, as the name states, a type of deformable polymer. As polymers are known to exhibit a distinct mechanical response, the nature of polymer materials should never be neglected when characterizing and modeling the performance of EAP actuators. Bucky-gel actuators are a subtype of EAPs where ion-containing polymer membrane acts as an electronically insulating separator between two electrodes of carbon nanotubes and ionic liquid. In many occasions, the electrodes also contain polymer for the purpose of binding it together. Therefore, mechanically speaking, bucky-gel actuators are composite structures with layers of different mechanical nature. The viscoelastic response and the shape change property are perhaps the most characteristic effects in polymers. These effects are known to have high dependence on factors such as the type of polymer, the concentration of additives and the structural ratio of different layers. At the same time, most reports about optimization of EAP actuators describe the alteration of electromechanical performance dependent on the same factors. In this paper, the performance of bucky-gel actuators is measured as a function between the output force and bending deflection. It is observed that effective stiffness of these actuators depends on the input voltage. This finding is also supported by dynamic mechanical analysis which demonstrates that the viscoelastic response of bucky-gel laminate depends on both frequency and temperature. Moreover, the dynamic mechanical analysis reveals that in the range of standard operation temperatures, tested samples were in their glass transition region, which made it possible to alter their shape by using mechanical fixing. The mechanical fixity above 90% was obtained when high-frequency input signal was used to heat the bucky-gel sample.

Proceedings Article | 9 April 2013 Paper

Electrochemistry of electromechanical actuators based on carbon nanotubes and ionic liquids

Kinji Asaka, Ken Mukai, Takushi Sugino, Hyacinthe Randriamahazaka, Toribio Fernández Otero

Proceedings Volume 8687, 86871U (2013) https://doi.org/10.1117/12.2009350

KEYWORDS: Actuators, Electrodes, Polymers, Single walled carbon nanotubes, Polymeric actuators, Magnesium, Liquids, Ions, Carbon nanotubes, Resistance

Read Abstract +

Proceedings Article | 4 April 2012 Paper

Low-voltage bending actuators from carbide-derived carbon improved with gold foil

Janno Torop, Takushi Sugino, Kinji Asaka, Alar Jänes, Enn Lust, Mati Arulepp, Alvo Aabloo

Proceedings Volume 8340, 834017 (2012) https://doi.org/10.1117/12.915029

KEYWORDS: Actuators, Electrodes, Carbon, Gold, Polymeric actuators, Polymers, Capacitance, Electroactive polymers, Liquids, Capacitors

Read Abstract +

Proceedings Article | 4 April 2012 Paper

CNT/conductive polymer composites for low-voltage driven EAP actuators

Takushi Sugino, Yoshiyuki Shibata, Kenji Kiyohara, Kinji Asaka

Proceedings Volume 8340, 83400T (2012) https://doi.org/10.1117/12.914759

KEYWORDS: Actuators, Electrodes, Magnesium, Liquids, Polymers, Polymeric actuators, Electroactive polymers, Composites, Silica, Gold

Read Abstract +

Proceedings Article | 4 April 2012 Paper

Reduction of the stress-relaxation of IPMC actuators by a fluctuating input and with a cooperative control

Kentaro Takagi, Suguru Hirayama, Shigenori Sano, Naoki Uchiyama, Kinji Asaka

Proceedings Volume 8340, 83402J (2012) https://doi.org/10.1117/12.915161

KEYWORDS: Actuators, Sensors, Control systems, Polymers, Composites, Polymeric actuators, Feedback control, Electroactive polymers, Electrodes, Diffusion

Read Abstract +

Proceedings Article | 4 April 2012 Paper

Electrochemical impedance spectroscopy of the bucky-gel actuators and their electromechanical modeling

Kinji Asaka, Kenji Kiyohara, Takushi Sugino, Ken Mukai, Hyacinthe Randriamahazaka

Proceedings Volume 8340, 83402M (2012) https://doi.org/10.1117/12.917392

KEYWORDS: Electrodes, Actuators, Resistance, Magnesium, Capacitance, Liquids, Dielectric spectroscopy, Polymers, Data modeling, Polymeric actuators

Read Abstract +

Proceedings Article | 29 March 2011 Paper

PWM drive of IPMC actuators with the consideration of the capacitive impedance

Kentaro Takagi, Naoya Yamaguchi, Kinji Asaka

Proceedings Volume 7976, 79762L (2011) https://doi.org/10.1117/12.880360

KEYWORDS: Amplifiers, Actuators, Polymers, Electroactive polymers, Device simulation, Modulation, Resistance, Circuit switching, Composites, Electronic filtering

Read Abstract +

Proceedings Article | 9 April 2010 Paper

Robust PID force control of IPMC actuators

Shigenori Sano, Kentaro Takagi, Susumu Sato, Suguru Hirayama, Naoki Uchiyama, Kinji Asaka

Proceedings Volume 7642, 76421U (2010) https://doi.org/10.1117/12.847842

KEYWORDS: Actuators, Control systems, Sensors, Polymers, Control systems design, Krypton, Solids, Composites, Amplifiers, Polymeric actuators

Read Abstract +

Proceedings Article | 9 April 2010 Paper

Electromechanical characteristics of actuators based on carbide-derived carbon

Janno Torop, Friedrich Kaasik, Takushi Sugino, Alvo Aabloo, Kinji Asaka

Proceedings Volume 7642, 76422A (2010) https://doi.org/10.1117/12.847469

KEYWORDS: Actuators, Electrodes, Carbon, Polymers, Capacitance, Polymeric actuators, Liquids, Ions, Electroactive polymers, Carbon nanotubes

Read Abstract +

Proceedings Article | 6 April 2009 Paper

Distributed parameter system modeling of IPMC actuators with the electro-stress diffusion coupling theory

Kentaro Takagi, Takaaki Osada, Kinji Asaka, Yoshikazu Hayakawa, Zhi-Wei Luo

Proceedings Volume 7287, 72871Q (2009) https://doi.org/10.1117/12.816012

KEYWORDS: Diffusion, Systems modeling, Polymers, Actuators, Ions, Electrodes, Polymeric actuators, Sodium, Partial differential equations, Circuit switching

Read Abstract +

Proceedings Article | 4 September 2008 Paper

Fast fully plastic actuator based on ionic-liquid-based bucky gel

Kinji Asaka, Ken Mukai, Ichiroh Takeuchi, Kenji Kiyohara, Takushi Sugino, Naohiro Terasawa, Kenji Hata, Takanori Fukushima, Takuzo Aida

Proceedings Volume 7037, 703710 (2008) https://doi.org/10.1117/12.794503

KEYWORDS: Actuators, Electrodes, Single walled carbon nanotubes, Liquids, Polymers, Polymeric actuators, Capacitance, Magnesium, Ions, Carbon nanotubes

Read Abstract +

Proceedings Article | 10 April 2008 Paper

Frequency response of anisotropic ionic polymer metal composites (IPMC) transducers

Boyko Stoimenov, Jonathan Rossiter, Toshiharu Mukai, Kinji Asaka

Proceedings Volume 6927, 69270K (2008) https://doi.org/10.1117/12.776520

KEYWORDS: Polymers, Actuators, Metals, Electrodes, Polymeric actuators, Composites, Manufacturing, Gold, Transducers, Electroactive polymers

Read Abstract +

Proceedings Article | 10 April 2008 Paper

Frequency response characteristics of IPMC sensors with current/voltage measurements

Kentaro Takagi, Norihiro Kamamichi, Boyko Stoimenov, Kinji Asaka, Toshiharu Mukai, Zhi-Wei Luo

Proceedings Volume 6927, 692724 (2008) https://doi.org/10.1117/12.776189

KEYWORDS: Sensors, Ions, Amplifiers, Data modeling, Model-based design, Solids, Polymers, Actuators, Composites, Plating

Read Abstract +

Proceedings Article | 5 April 2007 Paper

On a distributed parameter model for electrical impedance of ionic polymer

Kentaro Takagi, Yoshihiro Nakabo, Zhi-Wei Luo, Kinji Asaka

Proceedings Volume 6524, 652416 (2007) https://doi.org/10.1117/12.715554

KEYWORDS: Ions, Electrodes, Sodium, Circuit switching, Polymers, Resistance, Distributed computing, Interfaces, Motion models, Capacitors

Read Abstract +

Proceedings Article | 5 April 2007 Paper

Sensor-actuator coupled device for active tracheal tube using solid polymer electrolyte membrane

Tadashi Ihara, Taro Nakamura, Toshiharu Mukai, Kinji Asaka

Proceedings Volume 6524, 65241D (2007) https://doi.org/10.1117/12.716802

KEYWORDS: Scanning probe microscopy, Sensors, Signal detection, Actuators, Polymeric sensors, Polymers, Solids, HVAC controls, Amplifiers, Gold

Read Abstract +

A sensor-actuator coupled device was developed using solid polymer electrolyte membrane (SPM) as an active tracheal tube for ventilator. Active tracheal tube is a novel type of tube for ventilator that removes patient's phlegm automatically upon sensing the narrowing of trachea by phlegm. This type of active tube is extremely useful in clinical settings as currently the sole measure to remove phlegm from patient's tube is to do it manually by a nurse every few hours. As SPM works both as a sensor and an actuator, an effective compact device was developed. SPM based sensor-actuator coupled device was fabricated with modified gold plating method. Prepared SPM was fixed as an array on a plastic pipe of diameter 22 mm and was connected to a ventilator circuit and driven by a ventilator with a volume control ventilation (VCV) mode. SPM was connected both to a sensing unit and an actuation unit. Generated voltage developed by the membrane with the setting of the maximum pressure from 5 cmH₂O to 20 cmH₂O was in order of several hundred &mgr;V. SPM sensor demonstrated a biphasic response to the ventilator flow. The sensor data showed nearly linearly proportional voltage development to the intra-tracheal pressure. The sensed signal was filtered and digitized with an A/D converting unit on a PC board. A real time operating program was used to detect the sensed signal that indicates the narrowing of trachea. The program then activated a driving signal to control the actuation of the membrane. The signal was sent to a D/A converting unit. The output of the D/A unit was sent to an amplifier and the galvanostat unit which drives the membrane with constant current regardless of the change in the load. It was demonstrated that the sensor-actuator unit detects the narrowing of trachea within several hundreds milli-seconds and responds by actuating the same membrane with the driving voltage of 3-4 V and driving current of several hundred milli-ampere for each membrane. SPM array actuated the obstructing material of 2 g to expel from the trachea tube. Also, a theoretical model of the propagating wave generated by SPM was examined.

Proceedings Article | 30 March 2006 Paper

Solid polymer electrolyte membrane flow sensor for tracheal tube

Tadashi Ihara, Yoshito Ikada, Taro Nakamura, Toshiharu Mukai, Kinji Asaka

Proceedings Volume 6167, 61670U (2006) https://doi.org/10.1117/12.658928

KEYWORDS: Scanning probe microscopy, Sensors, Polymeric sensors, Polymers, Solids, Actuators, Data modeling, Polymeric actuators, Plating, Gold

Read Abstract +

Proceedings Article | 6 May 2005 Paper

Bending response of an artificial muscle in high-pressure water environments

Yoshihiro Nakabo, Kentaro Takagi, Toshiharu Mukai, Hiroshi Yoshida, Kinji Asaka

Proceedings Volume 5759, (2005) https://doi.org/10.1117/12.599412

KEYWORDS: Actuators, Artificial muscles, Robots, Polymers, Polymeric actuators, Electrodes, Video, Water, Polymer thin films, Composites

Read Abstract +

Proceedings Article | 6 May 2005 Paper

Limited-angle motor using ionic polymer-metal composite

Kentaro Takagi, Zhi Luo, Kinji Asaka, Kenji Tahara

Proceedings Volume 5759, (2005) https://doi.org/10.1117/12.599503

KEYWORDS: Actuators, Polymers, Motion models, Composites, Electroactive polymers, Systems modeling, Polymeric actuators, Robotics, Sensors, Artificial muscles

Read Abstract +

Proceedings Article | 27 July 2004 Paper

Modeling of the electromechanical response of ionic polymer metal composites (IPMC)

Kinji Asaka, Naoya Mori, Kohtaku Hayashi, Yoshihiro Nakabo, Toshiharu Mukai, Zhi-Wei Luo

Proceedings Volume 5385, (2004) https://doi.org/10.1117/12.539090

KEYWORDS: Polymers, Electrodes, Composites, Ions, Metals, Capacitance, Plating, Gold, Motion models, Actuators

Read Abstract +

Proceedings Article | 16 February 2004 Paper

Biomimetic soft robots with artificial muscles

Yoshihiro Nakabo, Toshiharu Mukai, Kinji Asaka

Proceedings Volume 5648, (2004) https://doi.org/10.1117/12.581825

KEYWORDS: Robots, Artificial muscles, Visualization, Actuators, Motion models, Kinematics, Control systems, Electrodes, Feedback control, Wave propagation

Read Abstract +

Proceedings Article | 28 July 2003 Paper

Development of artificial muscle actuator using an ionic polymer with its application to biped walking robots

Masaki Yamakita, Norihiko Kamamichi, Yasuaki Kaneda, Kinji Asaka, Zhi-Wei Luo

Proceedings Volume 5051, (2003) https://doi.org/10.1117/12.484290

KEYWORDS: Actuators, Robots, Data modeling, Artificial muscles, Polymers, Polymeric actuators, Systems modeling, Motion models, Electroactive polymers, Robotics

Read Abstract +