Piezoelectric effect of cyanoethylated hydroxyethylcellulose

Hirai, Nobuyuki; Ootake, Kooji; Suzuki, Kyouji; Sobue, Nobuo; Date, Munehiro; Watanabe, T.

doi:10.1007/bf00521872

Cited by 14 publications

(13 citation statements)

References 3 publications

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“…Piezoelectric charge constants, d 31 , for θ0, θ45, and θ90 are 7.3, 12.0, and 1.5 pC/N in the order of θ45 > θ90 > θ0, which implies the strong shear effect. This strong shear effect was previously studied [16] using different types of films. Piezoelectric charge constant for the θ0 case as a function of increased stretching ratio (from 1.5 to 1.8) increased from 5.9 to 10.1 pC/N.…”

Section: Resultsmentioning

confidence: 91%

Effect of Process Orientation on the Mechanical Behavior and Piezoelectricity of Electroactive Paper

Yoon¹,

Kim

2020

Materials

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This paper reports the effect of process orientation on the mechanical behavior and piezoelectricity of electroactive paper (EAPap) made from natural cotton pulp. EAPap is fabricated by a casting and wet drawing of cellulose film after dissolving cotton with LiCl and DMAc solvent. During the fabrication, permanent wrinkles, a possible factor for performance deterioration, were found in the films. Finite element method was introduced to identify the formation mechanism behind the wrinkles. The simulation results show that the wrinkles were caused by buckling and are inevitable under any conditions. The tensile and piezoelectric tests show that the orientation dependency of the stretched EAPap gives the anisotropic characteristics on both mechanical and piezoelectric properties. In this research, the anisotropic elastic moduli and Poisson’s ratios are reported. The piezoelectric charge constant of EAPap in the linear elastic is calculated. The piezoelectric charge constants of EAPap are associated with the alignment angle in the order of 45° > 0° > 90° due to the strong shear effect. The higher stretching ratio gives the higher piezoelectricity due to the alignment of the molecular chains and the microstructure in EAPap. The highest piezoelectric charge constant is found to be 12 pC/N at a stretching ratio of 1.6 and aligning angle of 45°.

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Section: Resultsmentioning

confidence: 91%

Effect of Process Orientation on the Mechanical Behavior and Piezoelectricity of Electroactive Paper

Yoon¹,

Kim

2020

Materials

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“…This orientation is associated with its shear piezoelectricity of EAPap. 18 In summary, the zone stretching in the automated process can effectively align cellulose fibers so as to improve its mechanical property as well as piezoelectric constant.…”

Section: Piezoelectric Propertymentioning

confidence: 99%

Evaluation of cellulose electro-active paper made by tape casting and zone stretching methods

Yun

Kim

Lee

2010

Int. J. Precis. Eng. Manuf.

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Cellulose has been discovered as a smart material that can be used as sensor and actuator material. In this paper, cellulose smart material termed as electro-active paper (EAPap) is prepared by an automated process that includes tape casting and zone stretching. To evaluate characteristics of the EAPap, its Young's modulus and piezoelectric charge constant are measured depending on the orientation angle, in comparison with the manually fabricated EAPap results. The zone stretching method can effectively align the cellulose fibers in the EAPap so as to improve its Young's modulus as well as piezoelectric charge constant. The 0 degree oriented sample shows its maximum Young's modulus and the 45 degree oriented sample exhibits the maximum piezoelectric charge constant. This 45 degree is associated with its shear piezoelectricity. The actuator performance of EAPap is evaluated by measuring its bending displacement depending on the orientation angle and the excitation voltage. The 45 degree oriented sample exhibits the maximum bending displacement. Details of the material preparation, the automation process, characterization and the actuator performance are addressed. This automated process that includes tape casting and zone stretching is suitable for mass production of the EAPap.

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“…The uniformity and its thickness of the regenerated cellulose film are determined in the casting stage. The mechanical and electromechanical properties of piezoelectric EAPap are strongly related to the direction of nanofibrils; we fixed the orientation angle of 45º to obtain the maximum electro-mechanical coupling effect of cellulose film [15,16]. To enhance the mechanical and piezoelectric properties of the regenerated cellulose, the cured film was stretched under stretching ratio (D R ) using home-made mechanical stretching equipment.…”

Section: Piezoelectric Eapap Membranementioning

confidence: 99%

Piezoelectric electro-active paper (EAPap) speaker

et al. 2011

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Film type piezoelectric speaker using cellulose electroactive paper (EAPap) in audible range was studied by acoustic characterization. The speaker was fabricated by depositing thin metal electrodes on both sides of EAPap. The local piezoelectric behavior of thin EAPap surface was visualized at 6 kHz and 221 Hz. The performance of EAPap film speaker as a function of size was evaluated in the audible frequency range, resulting in enhancement of speaker performance in low frequency range. From the measurement of geometric effect of EAPap speaker on audible performance, the circular type speaker shows better performance than rectangular one. Therefore we suggest that the piezoelectric EAPap has a potential for acoustic applications.

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Piezoelectric effect of cyanoethylated hydroxyethylcellulose

Cited by 14 publications

References 3 publications

Effect of Process Orientation on the Mechanical Behavior and Piezoelectricity of Electroactive Paper

Effect of Process Orientation on the Mechanical Behavior and Piezoelectricity of Electroactive Paper

Evaluation of cellulose electro-active paper made by tape casting and zone stretching methods

Piezoelectric electro-active paper (EAPap) speaker

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