Pressure-Sensitive Touch Panel Based on Piezoelectric Poly(L-lactic acid) Film

Ando, Masamichi; Kawamura, Hideki; Kitada, Hiroaki; Sekimoto, Yasuyuki; Inoue, Takafumi; Tajitsu, Yoshiro

doi:10.7567/jjap.52.09kd17

Cited by 78 publications

(72 citation statements)

References 27 publications

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“…Wood, which was found to be piezoelectric by Fukada (1955), has been the subject of electroelastic problems aimed at developing nondestructive evaluation (NDE) techniques (Galligan and Bertholf, 1963, Smetana and Kelso, 1971, Knuffel and Pizzi, 1986, Knuffel, 1988, Nakai, et al, 2004, 2006. On the other hand, PLLA is expected to be employed in human-machine interfaces (HMIs) for devices such as smart phones, tablet computers, and gaming devices (Ando, et al, 2012(Ando, et al, , 2013 and also in surgical instruments such as microtweezers and catheters (Tajitsu, et al, 2004, 2005, Tajitsu, 2006, 2008.…”

Section: Introductionmentioning

confidence: 99%

“…composed of PLLA require analytical solutions to the relevant electroelastic problems, because they are some of the few tools that can reveal the field quantities within such bodies. Motivated by these requirements, some researchers have been approaching the relevant electroelastic problems from the mesoscopic viewpoint in which both wooden materials and films or fibers made of PLLA have a macrosymmetry of  D in common (Fukada, 1955, Ando, et al, 2012, 2013, Tajitsu, et al, 2004, 2005, Tajitsu, 2006, 2008.  D symmetry is characterized by an  -fold rotation axis and a two-fold rotation axis perpendicular to it (Kim, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…The theoretical analyses mentioned above (Ishihara, et al, 2015(Ishihara, et al, , 2016a(Ishihara, et al, , 2016b(Ishihara, et al, 2016c were performed for isothermal cases because bodies with  D symmetry do not intrinsically exhibit pyroelectric effects (Ando, et al, 2012, 2013, Ishihara, et al, 2015. Meanwhile, as found in PLLA structures for HMIs and surgical instruments,  D bodies are inevitably exposed to a nonuniform temperature distribution due to heat flow from the surroundings.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermoelectroelastic response of a piezoelectric cylinder with D∞ symmetry under axisymmetric mechanical and thermal loading

Ootao

Kameo

Saito

2017

Mechanical Engineering Journal

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Carbon-neutral and biodegradable materials such as wood and poly-L-lactic acid play an important role in reducing environmental loads. Therefore, this study theoretically analyzed the thermoelectroelastic problem for a solid cylinder with D ∞ symmetry subjected to a distributed torsional shear stress as a mechanical input and to a nonuniform temperature distribution as a thermal disturbance, in order to gain an elementary understanding of the thermal effects on the electroelastic field in cylindrical bodies with D ∞ symmetry. The displacement components are expressed in terms of the elastic displacement potential function, the piezoelastic displacement potential function, and the thermoelastic displacement potential functions, and the electric field components are expressed in terms of the electric potential function. Subsequent to presenting the fundamental equations for thermoelectroelasticity, the governing equations for the above potential functions are derived based on the above fundamental equations. These governing equations are solved by a Fourier transform technique, and the theoretical solutions of the thermoelectroelastic field quantities are obtained. Furthermore, by performing numerical calculations, the distributions of the field quantities are illustrated graphically, and the structures of the thermoelectroelastic field are discussed qualitatively and quantitatively. Moreover, by quantitatively evaluating the ratio of the thermally disturbed electric displacement to the undisturbed electric displacement reflecting the mechanical input, the necessity of the thermoelectroelastic analyses, as treated in this paper, is clearly demonstrated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermoelectroelastic response of a piezoelectric cylinder with D∞ symmetry under axisymmetric mechanical and thermal loading

Ootao

Kameo

Saito

2017

Mechanical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…The piezoelectricity of wood has been used in nondestructive evaluation (NDE) techniques (Galligan and Bertholf, 1963, Smetana and Kelso, 1971, Knuffel and Pizzi, 1986, Knuffel, 1988, Nakai et al, 2004, 2006. The piezoelectricity of PLLA has been used to develop human-machine interfaces (HMIs) for informational devices (Ando et al, 2012(Ando et al, , 2013 and surgical instruments, such as microtweezers and catheters , 2005, Tajitsu, 2006, 2008.…”

Section: Introductionmentioning

confidence: 99%

“…The governing equations of these potential functions are shown. Then, the governing equations are solved using the Fourier integral technique with respect to the axial coordinate and the Fourier series technique with respect to the circumferential coordinate (Courant and Hilbert, 2004). The three-dimensional distributions of the electroelastic field quantities are formulated.…”

Section: Introductionmentioning

confidence: 99%

Electroelastic field in a piezoelectric solid cylinder with D∞ symmetry subjected to transverse mechanical load

Ootao

Kameo

2017

Mechanical Engineering Journal

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Electroelastic field in a piezoelectric solid cylinder with D ∞ symmetry subjected to transverse mechanical load Abstract For the safe operation of devices comprised of bodies with D ∞ symmetry, the electroelastic field in a solid cylinder subjected to a non-axisymmetric surface load of radial and circumferential stresses was investigated. The analytical technique constructed previously, the Fourier integral technique with respect to the axial coordinate, and the Fourier series technique with respect to the circumferential coordinate were employed. Then the three-dimensional distributions of the electroelastic field quantities, such as displacement, electric potential, electric field, strain, stress, and electric displacement, were determined. In addition, the resultant forces and moments on the axial section were formulated. Using numerical calculations assuming health monitoring or NDE techniques, it was found that the structures of the electroelastic field were dependent on the composition of the combined load even when the integrated effect of the combined load was constant and that the detailed three-dimensional analyses were absolutely significant. Then, the primary coupling behavior in the D ∞ bodies was investigated for health monitoring, and it was found that the stress-strain relationship was substantially elastic but the developed electric displacement was affected by both of the piezoelectric and dielectric effects comparably and that the coupled analyses were also significant. Moreover, an elementary methodology to decompose the combined load into components was suggested and was successfully implemented for a concrete example.

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Biodegradable Piezoelectric Polymers: Recent Advancements in Materials and Applications

Mohsin

Bathaei

Istif

et al. 2023

Adv Healthcare Materials

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Recent materials, microfabrication, and biotechnology improvements have introduced numerous exciting bioelectronic devices based on piezoelectric materials. There is an intriguing evolution from conventional unrecyclable materials to biodegradable, green, and biocompatible functional materials. As a fundamental electromechanical coupling material in numerous applications, novel piezoelectric materials with a feature of degradability and desired electrical and mechanical properties are being developed for future wearable and implantable bioelectronics. These bioelectronics can be easily integrated with biological systems for applications, including sensing physiological signals, diagnosing medical problems, opening the blood‐brain barrier, and stimulating healing or tissue growth. Therefore, the generation of piezoelectricity from natural and synthetic bioresorbable polymers has drawn great attention in the research field. Herein, the significant and recent advancements in biodegradable piezoelectric materials, including natural and synthetic polymers, their principles, advanced applications, and challenges for medical uses, are reviewed thoroughly. The degradation methods of these piezoelectric materials through in vitro and in vivo studies are also investigated. These improvements in biodegradable piezoelectric materials and microsystems could enable new applications in the biomedical field. In the end, potential research opportunities regarding the practical applications are pointed out that might be significant for new materials research.

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Pressure-Sensitive Touch Panel Based on Piezoelectric Poly(L-lactic acid) Film

Cited by 78 publications

References 27 publications

Thermoelectroelastic response of a piezoelectric cylinder with D<sub>∞</sub> symmetry under axisymmetric mechanical and thermal loading

Thermoelectroelastic response of a piezoelectric cylinder with D<sub>∞</sub> symmetry under axisymmetric mechanical and thermal loading

Electroelastic field in a piezoelectric solid cylinder with D<sub>∞</sub> symmetry subjected to transverse mechanical load

Biodegradable Piezoelectric Polymers: Recent Advancements in Materials and Applications

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