The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Yasuo Kuga - One of the best experts on this subject based on the ideXlab platform.
-
a Flemion based actuator with ionic liquid as solvent
Smart Materials and Structures, 2007Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:A perfluorinated carboxylic acid membrane, i.e. Flemion, shows improved performance as actuator material compared with Nafion (perfluorinated sulfonic acid). Flemion has a higher ion exchange capacity and good mechanical strength. In particular, Flemion will deform with no back relaxation under applied electrical stimulus. However, with water as solvent, the operation of Flemion in air has serious problems, since water would evaporate quickly in air. Moreover, the electrochemical stability for use in water is around 1 V at room temperature. In previous work, investigations on Nafion with ionic liquid as solvents have been carried out by some researchers and good results have been obtained. In this work, we explore the use of highly stable ionic liquid instead of water as solvent in Flemion. Experimental results indicate that Flemion-based actuators with ionic liquid as solvent have improved stability as compared to the water samples. Although the forces exhibited by Flemion-based actuators with the use of ionic liquid decreased dramatically compared to water, these preliminary results suggest good potential for the use of Flemion with ionic liquid in future applications.
-
mechanical stability optimization of Flemion based composite artificial muscles by use of proper solvent
Journal of Materials Research, 2006Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:Ionic polymer metal composite (IPMC) is a promising candidate for artificial muscles and other bio-related applications. Compared with the widely reported Nafion, Flemion-based IPMC has some more attractive advantages. To improve its mechanical stability in dry environments, the organic solvent glycerol was applied. The mechanical characteristics such as tip displacement, tip force and durability were measured and analyzed. The results showed that Flemion-based IPMC with glycerol as solvent has optimum mechanical stability in dry conditions and will be a good candidate for artificial muscles working in air.
-
Flemion based actuator with ionic liquid as solvent
Proceedings of SPIE the International Society for Optical Engineering, 2006Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:A perfluorinated carboxylic acid membrane, i.e. Flemion, shows improved performance as actuator material compared with Nafion (perfluorinated sulfonic acide). Flemion has a higher ion exchange capacity and good mechanical strength. Especially, Flemion will deform with no back relaxation when applied electrical stimulus. However, with water as solvent, the operation of Flemion in air has serious problems. Since water would evaporate quickly in air. Moreover, the electrochemical stability for use in water is around 1V at room temperature. In previous work, investigations on Nafion with ionic liquid as solvents have been carried out and good results have been obtained. In this work, we explore the use of highly stable ionic liquid instead of water as solvent in Flemion. Experimental results indicate that Flemion based actuators with ionic liquid as solvent have improved stability as compared to the water samples. Although the forces exhibited by Flemion based actuators with the use of ionic liquid decreased dramatically as compared to water, these preliminary results suggest a good potential for use of Flemion with ionic liquid in some applications.
-
Flemion based actuator for mechanically controlled microwave switch
PROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Smart Structures and Materials 2003 Electroactive Polymer Actuators and , 2003Co-Authors: Marie Le Guilly, Minoru Taya, Victor Cheng, Lucien Opperman, Yasuo KugaAbstract:A microwave switch based on EAP presents several advantages. A switch based on Flemion is studied. Flemion a perfluorinated carboxylic acid membrane shows improved performance as actuator material compared with Nafion (perfluorinated sulfonic acid). Flemion has a higher ion exchange capacity and good mechanical strength. In order to get a good Flemion actuator, highly conductive soft gold electrodes with large fractal structure have to be deposited on the membrane. The impregnation reduction technique used for plating requires exchange of a gold complex and reduction by gradual sodium sulfite additions. K + shows the highest exchange ratio with the gold complex and reducing bath temperatures around 60°C with enough reducing agent present are shown to promote the growth of a gold fractal structure. The resulting material shows an actuation displacement with no relaxation, a key feature for switch applications. A simple mechanical switch based on a Flemion actuator is prepared and tested as a microwave switch.
Minoru Taya - One of the best experts on this subject based on the ideXlab platform.
-
bioinspired design of tactile sensors based on Flemion
Journal of Applied Physics, 2009Co-Authors: Join Wang, Hiroshi Sato, Minoru TayaAbstract:In this work, we studied experimentally the sensing behavior of ionic membrane-based tactile sensors (Nafion and Flemion). We found from the experimental results that Flemion-based sensor exhibits clearer sensing signals than Nafion-based sensor and signals from Flemion-based sensor are robust under repeated loading. We also found that dome-shaped Flemion sensor can detect three-dimensional forces. We attempted to design an arrayed Flemion sensor system by bioinspiration from the tactile sensor cells on the skin of a cucumber tendril where numbers of the dome-shaped Flemion sensor units are arrayed periodically.
-
a Flemion based actuator with ionic liquid as solvent
Smart Materials and Structures, 2007Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:A perfluorinated carboxylic acid membrane, i.e. Flemion, shows improved performance as actuator material compared with Nafion (perfluorinated sulfonic acid). Flemion has a higher ion exchange capacity and good mechanical strength. In particular, Flemion will deform with no back relaxation under applied electrical stimulus. However, with water as solvent, the operation of Flemion in air has serious problems, since water would evaporate quickly in air. Moreover, the electrochemical stability for use in water is around 1 V at room temperature. In previous work, investigations on Nafion with ionic liquid as solvents have been carried out by some researchers and good results have been obtained. In this work, we explore the use of highly stable ionic liquid instead of water as solvent in Flemion. Experimental results indicate that Flemion-based actuators with ionic liquid as solvent have improved stability as compared to the water samples. Although the forces exhibited by Flemion-based actuators with the use of ionic liquid decreased dramatically compared to water, these preliminary results suggest good potential for the use of Flemion with ionic liquid in future applications.
-
mechanical stability optimization of Flemion based composite artificial muscles by use of proper solvent
Journal of Materials Research, 2006Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:Ionic polymer metal composite (IPMC) is a promising candidate for artificial muscles and other bio-related applications. Compared with the widely reported Nafion, Flemion-based IPMC has some more attractive advantages. To improve its mechanical stability in dry environments, the organic solvent glycerol was applied. The mechanical characteristics such as tip displacement, tip force and durability were measured and analyzed. The results showed that Flemion-based IPMC with glycerol as solvent has optimum mechanical stability in dry conditions and will be a good candidate for artificial muscles working in air.
-
Flemion based actuator with ionic liquid as solvent
Proceedings of SPIE the International Society for Optical Engineering, 2006Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:A perfluorinated carboxylic acid membrane, i.e. Flemion, shows improved performance as actuator material compared with Nafion (perfluorinated sulfonic acide). Flemion has a higher ion exchange capacity and good mechanical strength. Especially, Flemion will deform with no back relaxation when applied electrical stimulus. However, with water as solvent, the operation of Flemion in air has serious problems. Since water would evaporate quickly in air. Moreover, the electrochemical stability for use in water is around 1V at room temperature. In previous work, investigations on Nafion with ionic liquid as solvents have been carried out and good results have been obtained. In this work, we explore the use of highly stable ionic liquid instead of water as solvent in Flemion. Experimental results indicate that Flemion based actuators with ionic liquid as solvent have improved stability as compared to the water samples. Although the forces exhibited by Flemion based actuators with the use of ionic liquid decreased dramatically as compared to water, these preliminary results suggest a good potential for use of Flemion with ionic liquid in some applications.
-
Flemion based actuator for mechanically controlled microwave switch
PROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Smart Structures and Materials 2003 Electroactive Polymer Actuators and , 2003Co-Authors: Marie Le Guilly, Minoru Taya, Victor Cheng, Lucien Opperman, Yasuo KugaAbstract:A microwave switch based on EAP presents several advantages. A switch based on Flemion is studied. Flemion a perfluorinated carboxylic acid membrane shows improved performance as actuator material compared with Nafion (perfluorinated sulfonic acid). Flemion has a higher ion exchange capacity and good mechanical strength. In order to get a good Flemion actuator, highly conductive soft gold electrodes with large fractal structure have to be deposited on the membrane. The impregnation reduction technique used for plating requires exchange of a gold complex and reduction by gradual sodium sulfite additions. K + shows the highest exchange ratio with the gold complex and reducing bath temperatures around 60°C with enough reducing agent present are shown to promote the growth of a gold fractal structure. The resulting material shows an actuation displacement with no relaxation, a key feature for switch applications. A simple mechanical switch based on a Flemion actuator is prepared and tested as a microwave switch.
Jin Wang - One of the best experts on this subject based on the ideXlab platform.
-
a Flemion based actuator with ionic liquid as solvent
Smart Materials and Structures, 2007Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:A perfluorinated carboxylic acid membrane, i.e. Flemion, shows improved performance as actuator material compared with Nafion (perfluorinated sulfonic acid). Flemion has a higher ion exchange capacity and good mechanical strength. In particular, Flemion will deform with no back relaxation under applied electrical stimulus. However, with water as solvent, the operation of Flemion in air has serious problems, since water would evaporate quickly in air. Moreover, the electrochemical stability for use in water is around 1 V at room temperature. In previous work, investigations on Nafion with ionic liquid as solvents have been carried out by some researchers and good results have been obtained. In this work, we explore the use of highly stable ionic liquid instead of water as solvent in Flemion. Experimental results indicate that Flemion-based actuators with ionic liquid as solvent have improved stability as compared to the water samples. Although the forces exhibited by Flemion-based actuators with the use of ionic liquid decreased dramatically compared to water, these preliminary results suggest good potential for the use of Flemion with ionic liquid in future applications.
-
mechanical stability optimization of Flemion based composite artificial muscles by use of proper solvent
Journal of Materials Research, 2006Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:Ionic polymer metal composite (IPMC) is a promising candidate for artificial muscles and other bio-related applications. Compared with the widely reported Nafion, Flemion-based IPMC has some more attractive advantages. To improve its mechanical stability in dry environments, the organic solvent glycerol was applied. The mechanical characteristics such as tip displacement, tip force and durability were measured and analyzed. The results showed that Flemion-based IPMC with glycerol as solvent has optimum mechanical stability in dry conditions and will be a good candidate for artificial muscles working in air.
-
Flemion based actuator with ionic liquid as solvent
Proceedings of SPIE the International Society for Optical Engineering, 2006Co-Authors: Jin Wang, Minoru Taya, Yasuo KugaAbstract:A perfluorinated carboxylic acid membrane, i.e. Flemion, shows improved performance as actuator material compared with Nafion (perfluorinated sulfonic acide). Flemion has a higher ion exchange capacity and good mechanical strength. Especially, Flemion will deform with no back relaxation when applied electrical stimulus. However, with water as solvent, the operation of Flemion in air has serious problems. Since water would evaporate quickly in air. Moreover, the electrochemical stability for use in water is around 1V at room temperature. In previous work, investigations on Nafion with ionic liquid as solvents have been carried out and good results have been obtained. In this work, we explore the use of highly stable ionic liquid instead of water as solvent in Flemion. Experimental results indicate that Flemion based actuators with ionic liquid as solvent have improved stability as compared to the water samples. Although the forces exhibited by Flemion based actuators with the use of ionic liquid decreased dramatically as compared to water, these preliminary results suggest a good potential for use of Flemion with ionic liquid in some applications.
M Yoshitake - One of the best experts on this subject based on the ideXlab platform.
-
characterization of Flemion membranes for pefc
Electrochimica Acta, 1998Co-Authors: N Yoshida, T Ishisaki, A Watakabe, M YoshitakeAbstract:Abstract Perfluorinated ion exchange membranes were studied to clarify the characteristics of membranes required for polymer electrolyte fuel cells (PEFC). The influence of membrane thickness on gas permeability and the influence of incorporation of cations on water content and ac specific resistance of Flemion® and Nafion®117 were estimated. Gas permeation rates of the membranes decreased in inverse proportion to the increase of the membrane thickness and gas permeability coefficients were nearly constant and independent of the thickness. Hydrogen permeation rates of Flemion®S at 70°C were converted to 2.1 mA/cm 2 as current density. Water content changed by only 5% in the region of the ion exchange ratio from 0% to 100% and was independent on the kinds of incorporated cations in the region of the ion exchange ratio under 40% except for K + . Ac specific resistance increased markedly when the ion exchange ratio exceeded 50%. In the case that the ion exchange ratio was under 30%, ac specific resistance increased with decrease of the numbers of protons having no relation with the kinds of cations. Area resistance of Flemion® was smaller because it has higher ion exchange capacity and thinner thickness than Nafion®117.
-
Flemion reg_sign s and pefc
1996Co-Authors: M Yoshitake, N Yoshida, T IshisakiAbstract:Asahi Glass Co., Ltd. (AGC) had commercialized chloro-alkali electrolysis process using perfluorinated ion exchange membranes (Flemion{reg_sign}). AGC participated in the PEFC project of NEDO (New Energy and Industrial Technology Development Organization) which started in the fiscal year 1992. In this program, AGC selected Flemion{reg_sign}S as one of the candidate membranes for PEFC. The properties of Flemion{reg_sign}S and Nafion{reg_sign}117 such as thermal stability, mechanical strength in dry and wet state, water content, AC specific resistance and gas permeability in dry and wet state, were evaluated and a new method of the preparation of membrane-electrode composites was developed.
N Yoshida - One of the best experts on this subject based on the ideXlab platform.
-
characterization of Flemion membranes for pefc
Electrochimica Acta, 1998Co-Authors: N Yoshida, T Ishisaki, A Watakabe, M YoshitakeAbstract:Abstract Perfluorinated ion exchange membranes were studied to clarify the characteristics of membranes required for polymer electrolyte fuel cells (PEFC). The influence of membrane thickness on gas permeability and the influence of incorporation of cations on water content and ac specific resistance of Flemion® and Nafion®117 were estimated. Gas permeation rates of the membranes decreased in inverse proportion to the increase of the membrane thickness and gas permeability coefficients were nearly constant and independent of the thickness. Hydrogen permeation rates of Flemion®S at 70°C were converted to 2.1 mA/cm 2 as current density. Water content changed by only 5% in the region of the ion exchange ratio from 0% to 100% and was independent on the kinds of incorporated cations in the region of the ion exchange ratio under 40% except for K + . Ac specific resistance increased markedly when the ion exchange ratio exceeded 50%. In the case that the ion exchange ratio was under 30%, ac specific resistance increased with decrease of the numbers of protons having no relation with the kinds of cations. Area resistance of Flemion® was smaller because it has higher ion exchange capacity and thinner thickness than Nafion®117.
-
Flemion reg_sign s and pefc
1996Co-Authors: M Yoshitake, N Yoshida, T IshisakiAbstract:Asahi Glass Co., Ltd. (AGC) had commercialized chloro-alkali electrolysis process using perfluorinated ion exchange membranes (Flemion{reg_sign}). AGC participated in the PEFC project of NEDO (New Energy and Industrial Technology Development Organization) which started in the fiscal year 1992. In this program, AGC selected Flemion{reg_sign}S as one of the candidate membranes for PEFC. The properties of Flemion{reg_sign}S and Nafion{reg_sign}117 such as thermal stability, mechanical strength in dry and wet state, water content, AC specific resistance and gas permeability in dry and wet state, were evaluated and a new method of the preparation of membrane-electrode composites was developed.