The development is described of an electromechanical bimorph actuator composed of ionic liquid gel sandwiched by electrochemically treated millimeter-long single-walled carbon nanotubes(SG-SWNT).Electrochemical doping...The development is described of an electromechanical bimorph actuator composed of ionic liquid gel sandwiched by electrochemically treated millimeter-long single-walled carbon nanotubes(SG-SWNT).Electrochemical doping of the SG-SWNT and electrochemical polymerization of polypyrrole on the surface of the SG-SWNT improved the performance of a previously reported actuator using non-treated SG-SWNTs.The conductivity of the SG-SWNT sheets treated at the anodic potential(doped)was found to be three times larger than that of the original film.The generated strain of the actuator prepared from the doped SG-SWNT sheets was increased compared to that prepared from non-doped sample.Moreover,the generated strain of the actuator from the doped SG-SWNT sheets swelled with ionic liquid(IL)was increased to twice that without ILs.The electropolymerization of pyrrole on the surface of the SG-SWNT sheet was carried out.The conductivity of the SG-SWNT was seven times larger after the electropolymerization.The generated strain of the SG-SWNT actuator prepared from the SG-SWNT sheets with electropolymerization was twice as large as that without the electropolymerization at low frequency.At higher frequency,both actuators provide almost the same performance.Both actuators exhibit mechanical resonance at about 100 Hz.展开更多
This paper demonstrates the importance of three-dimensional(3-D)piezoelectric coupling in the electromechanical behavior of piezoelectric devices using three-dimensional finite element analyses based on weak and stron...This paper demonstrates the importance of three-dimensional(3-D)piezoelectric coupling in the electromechanical behavior of piezoelectric devices using three-dimensional finite element analyses based on weak and strong coupling models for a thin cantilevered piezoelectric bimorph actuator.It is found that there is a significant difference between the strong and weak coupling solutions given by coupling direct and inverse piezoelectric effects(i.e.,piezoelectric coupling effect).In addition,there is significant longitudinal bending caused by the constraint of the inverse piezoelectric effect in the width direction at the fixed end(i.e.,3-D effect).Hence,modeling of these effects or 3-D piezoelectric coupling modeling is an electromechanical basis for the piezoelectric devices,which contributes to the accurate prediction of their behavior.展开更多
文摘The development is described of an electromechanical bimorph actuator composed of ionic liquid gel sandwiched by electrochemically treated millimeter-long single-walled carbon nanotubes(SG-SWNT).Electrochemical doping of the SG-SWNT and electrochemical polymerization of polypyrrole on the surface of the SG-SWNT improved the performance of a previously reported actuator using non-treated SG-SWNTs.The conductivity of the SG-SWNT sheets treated at the anodic potential(doped)was found to be three times larger than that of the original film.The generated strain of the actuator prepared from the doped SG-SWNT sheets was increased compared to that prepared from non-doped sample.Moreover,the generated strain of the actuator from the doped SG-SWNT sheets swelled with ionic liquid(IL)was increased to twice that without ILs.The electropolymerization of pyrrole on the surface of the SG-SWNT sheet was carried out.The conductivity of the SG-SWNT was seven times larger after the electropolymerization.The generated strain of the SG-SWNT actuator prepared from the SG-SWNT sheets with electropolymerization was twice as large as that without the electropolymerization at low frequency.At higher frequency,both actuators provide almost the same performance.Both actuators exhibit mechanical resonance at about 100 Hz.
基金supported by the Japan Society for the Promotion of Science under KAKENHI Grant Nos.19F19379 and 20H04199。
文摘This paper demonstrates the importance of three-dimensional(3-D)piezoelectric coupling in the electromechanical behavior of piezoelectric devices using three-dimensional finite element analyses based on weak and strong coupling models for a thin cantilevered piezoelectric bimorph actuator.It is found that there is a significant difference between the strong and weak coupling solutions given by coupling direct and inverse piezoelectric effects(i.e.,piezoelectric coupling effect).In addition,there is significant longitudinal bending caused by the constraint of the inverse piezoelectric effect in the width direction at the fixed end(i.e.,3-D effect).Hence,modeling of these effects or 3-D piezoelectric coupling modeling is an electromechanical basis for the piezoelectric devices,which contributes to the accurate prediction of their behavior.
