Ultrasonic Motor Applications

Uchino, K.

doi:10.1007/978-1-4613-1463-9_9

Cited by 67 publications

(43 citation statements)

References 7 publications

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“…As for ferroelectrics (17), the maximum work capacity per cycle is the product of the input electrical energy and a factor that increases from k Even if the mechanical property optimization for sheets of nonbundled nanotubes results in a Y/ value that is two orders of magnitude lower than experimentally derived (15) for individual nanotube bundles, the predicted gravimetric work capacity still exceeds that of any alternative actuator material. However, it must be emphasized that the present nanotube sheets are primitively constructed initial materials that are far from providing the surface areas and mechanical properties required for such predicted performance.…”

mentioning

confidence: 96%

Carbon Nanotube Actuators

Baughman¹,

Cui²,

Zakhidov³

et al. 1999

Science

2,351

1,440

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Electromechanical actuators based on sheets of single-walled carbon nanotubes were shown to generate higher stresses than natural muscle and higher strains than high-modulus ferroelectrics. Like natural muscles, the macroscopic actuators are assemblies of billions of individual nanoscale actuators. The actuation mechanism (quantum chemical–based expansion due to electrochemical double-layer charging) does not require ion intercalation, which limits the life and rate of faradaic conducting polymer actuators. Unlike conventional ferroelectric actuators, low operating voltages of a few volts generate large actuator strains. Predictions based on measurements suggest that actuators using optimized nanotube sheets may eventually provide substantially higher work densities per cycle than any previously known technology

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mentioning

confidence: 96%

Carbon Nanotube Actuators

Baughman¹,

Cui²,

Zakhidov³

et al. 1999

Science

2,351

1,440

View full text Add to dashboard Cite

show abstract

“…[1][2][3] As compared to electroactive ceramics and shape memory alloys, electroactive polymeric materials offer a unique combination of qualities because they are lightweight, conformable, and tough. Recently, we have developed a series of amorphous piezoelectric polyimides containing polar functional groups based on molecular design and computational chemistry, for potential use as sensors in high temperature applications.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Single Wall Carbon Nanotubes on the Dipole Orientation and Piezoelectric Properties of Polymeric Nanocomposites

Kang

Park

Gaik

et al. 2006

NANO

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Recently, a series of single wall carbon nanotube (SWNT) polyimide nanocomposites were developed since the demand of electroactive polymeric materials as sensors and actuators for use in high temperature applications has been growing. Adding SWNTs into electroactive polyimides enhanced their electrostrictive strain as well as their mechanical integrities and chemical stability. Although an increase in piezoelectricity resulting from the incorporation of SWNTs could be expected, there has been no systematic study detailing the effect of SWNTs on piezoelectricity. In this article, the effects of various types and concentrations of SWNT on the dipole orientation and piezoelectricity were investigated using a thermally stimulated current (TSC) technique and a modified Rheovibron. It was found that the barely modified SWNTs led to a more substantial increase in the remanent polarization (P r ) than the highly modified SWNTs did. As the loading level of SWNTs increased, P r increased. However, excessive loading of SWNTs showed a reduction in P r since the actual poling field decreased due to a large leakage of current. The trend of the piezoelectric strain coefficient, d 31 , was consistent with that of P r . The increase in interfacial polarization caused by adding SWNT was believed to be primarily responsible for the increase of P r and d 31 .

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“…4 Electromechanical strain in PMN-based ceramics is not stable in high temperature regimes due to the notable temperature dependence of polarization above the permittivity maximum. 5,6 In the case of piezoelectrics, electromechanical coupling is restricted by the Curie or depoling temperature (T c and T d , respectively), and functional properties are lost above these transitions. High temperature applications, therefore, require materials with both high T c and T d .…”

mentioning

confidence: 99%

Temperature stable and fatigue resistant lead-free ceramics for actuators

Khesro

Wang

Hussain

et al. 2016

Applied Physics Letters

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Lead-free ceramics with the composition 0.91K1/2Bi1/2TiO3–0.09(0.82BiFeO3-0.15NdFeO3-0.03Nd2/3TiO3) were prepared using a conventional solid state, mixed oxide route. The ceramics exhibited a high strain of 0.16% at 6 kV mm−1, stable from room temperature to 175 °C, with a variation of <10%. The materials were fabricated into multilayer structures by co-firing with Pt internal electrodes. The prototype multilayer actuator exhibited constant strains up to 300 °C with a variation of ∼15%. The composition showed fatigue resistant behaviour in both monolithic and multilayer form after bipolar loading of 106 cycles.

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Ultrasonic Motor Applications

Cited by 67 publications

References 7 publications

Carbon Nanotube Actuators

Carbon Nanotube Actuators

The Effect of Single Wall Carbon Nanotubes on the Dipole Orientation and Piezoelectric Properties of Polymeric Nanocomposites

Temperature stable and fatigue resistant lead-free ceramics for actuators

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