Piezoelectric Motion of Multilayer Film with Alternate Rows of Optical Isomers of Chiral Polymer Film

Yoshida, Takaichi; Imoto, Kenji; Nakai, Takaaki; Uwami, Ryouta; Kataoka, Takuya; Inoue, M.; Fukumoto, Takahiro; Kamimura, Yuuki; Kato, Atsuko

doi:10.7567/jjap.50.09nd13

Cited by 17 publications

(18 citation statements)

References 16 publications

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“…Although possessing a modest piezoelectric response (5-15 pC/N), PLLA has a low dielectric constant, which allows the material to perform the same energy-conversion efficacy as the common piezoelectric polymer PVDF (16,20). By creating multilayers, one can achieve even higher piezoelectricity from PLLA, with an "effective" conversion efficiency, similar to that of ceramic PZT (21).…”

Section: Significancementioning

confidence: 99%

Biodegradable Piezoelectric Force Sensor

Curry

Chorsi

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

301

251

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Measuring vital physiological pressures is important for monitoring health status, preventing the buildup of dangerous internal forces in impaired organs, and enabling novel approaches of using mechanical stimulation for tissue regeneration. Pressure sensors are often required to be implanted and directly integrated with native soft biological systems. Therefore, the devices should be flexible and at the same time biodegradable to avoid invasive removal surgery that can damage directly interfaced tissues. Despite recent achievements in degradable electronic devices, there is still a tremendous need to develop a force sensor which only relies on safe medical materials and requires no complex fabrication process to provide accurate information on important biophysiological forces. Here, we present a strategy for material processing, electromechanical analysis, device fabrication, and assessment of a piezoelectric Poly-l-lactide (PLLA) polymer to create a biodegradable, biocompatible piezoelectric force sensor, which only employs medical materials used commonly in Food and Drug Administration-approved implants, for the monitoring of biological forces. We show the sensor can precisely measure pressures in a wide range of 0-18 kPa and sustain a reliable performance for a period of 4 d in an aqueous environment. We also demonstrate this PLLA piezoelectric sensor can be implanted inside the abdominal cavity of a mouse to monitor the pressure of diaphragmatic contraction. This piezoelectric sensor offers an appealing alternative to present biodegradable electronic devices for the monitoring of intraorgan pressures. The sensor can be integrated with tissues and organs, forming self-sensing bionic systems to enable many exciting applications in regenerative medicine, drug delivery, and medical devices.

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Section: Significancementioning

confidence: 99%

Biodegradable Piezoelectric Force Sensor

Curry

Chorsi

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

301

251

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“…Meanwhile, self‐powered mechanical sensors based on piezoelectric materials can decrease the power consumption of the electronic system . A wide range of piezoelectric materials have been investigated, such as polymers including poly(vinylidene fluoride) and polylactic acid (PLA), and inorganic nanomaterials including zinc oxide and lead zirconate titanate …”

Section: Introductionmentioning

confidence: 99%

Transparent and Stretchable Interactive Human Machine Interface Based on Patterned Graphene Heterostructures

Lim

Son

Kim

et al. 2014

Adv Funct Materials

518

381

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375wileyonlinelibrary.com the human body and bulky devices [3][4][5] ; the unnatural appearance owing to the infl exibility of electronics [ 6 ] ; and the signal artifacts that originate from the non-conformal attachment of the rigid sensors to the human body. [3][4][5] Therefore, novel ultrathin devices that can be conformally laminated onto human skin such that they have natural appearance, comfort, and high signal-to-noise ratio (SNR) are desired.The adoption of fl exible and stretchable designs and a concomitant reduction in the thickness and weight of devices are key goals with respect to the design of wearable electronics. Signifi cant efforts have been made recently, including the development of stretchable inorganic electronics, [ 3,4,7 ] ultrathin and lightweight organic sensors, [ 8,9 ] fl exible nanomaterialbased electronic skins, [ 10,11 ] self-powered motion sensors based on the triboelectric effect, [ 12,13 ] and highly sensitive fl exible mechanical sensors. [14][15][16][17] Ultrathin and deformable designs allow for accurate data acquisition from the human body with minimum signal artifacts. However, these previously reported devices are made of opaque semiconductors and metals, which look different from human skin. In addition, many of these sensors lack power supply devices [3][4][5] and thus self-powering is important.Transparent electronic nanomaterials can make wearable devices invisible, resulting in a natural look and improved aesthetics. For example, carbon-based nanomaterials (such as graphene (GP) [ 18 ] and carbon nanotubes [ 19 ] and metal nanowire (NW) networks (such as silver NWs [ 20 ] and gold NWs [ 21 ] have been intensively researched. These transparent nanomaterials An interactive human-machine interface (iHMI) enables humans to control hardware and collect feedback information. In particular, wearable iHMI systems have attracted tremendous attention owing to their potential for use in personal mobile electronics and the Internet of Things. Although significant progress has been made in the development of iHMI systems, those based on rigid electronics have constraints in terms of wearability, comfortability, signal-to-noise ratio (SNR), and aesthetics. Herein the fabrication of a transparent and stretchable iHMI system composed of wearable mechanical sensors and stimulators is reported. The ultrathin and lightweight design of the system allows superior wearability and high SNR. The use of conductive/piezoelectric graphene heterostructures, which consist of poly( L -lactic acid), single-walled carbon nanotubes, and silver nanowires, results in high transparency, excellent performance, and low power consumption as well as mechanical deformability. The control of a robot arm for various motions and the feedback stimulation upon successful executions of commands are demonstrated using the wearable iHMI system.

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“…Kondo and Tagashira [6] introduced new electron transport coefficients called α parameters, which are defined by arrival-time spectra of an electron swarm, and reported that the α parameters are related to D 3L . Arrival-time spectra of an electron swarm can be measured by a double-shutter drift tube, and the procedure for obtaining the α parameters from the measured arrival time spectra is well established [7][8][9][10][11][12][13][14][15]; therefore, there is a possibility that values of D 3L are obtained experimentally by the α parameters.…”

Section: Introductionmentioning

confidence: 99%

Expression of longitudinal third-order transport coefficient in terms of α parameters and its validity

Kawaguchi¹,

Takahashi²,

Satoh³

2018

Plasma Sources Sci. Technol.

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The relation between the longitudinal third-order transport coefficient ω 3 contained in the continuity equation for electrons and α parameters defined by arrival-time spectra of an electron swarm is deduced. Values of ω 3 and the α parameters in CH 4 gas and SF 6 gas are calculated by Monte Carlo simulation, and then the values of ω 3 are compared with those of the longitudinal third-order transport coefficient ω′ 3 which are calculated from the α parameters to examine the validity of the deduced relation. The values of ω′ 3 are found to excellently agree with those of ω 3 below 500 Td in CH 4 gas and from 150 Td to 700 Td in SF 6 gas, where the values of the effective ionisation coefficient are nought or quite small. The results suggest that values of ω 3 can be obtained experimentally from arrival-time spectra measured by a double-shutter drift tube.

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Piezoelectric Motion of Multilayer Film with Alternate Rows of Optical Isomers of Chiral Polymer Film

Cited by 17 publications

References 16 publications

Biodegradable Piezoelectric Force Sensor

Biodegradable Piezoelectric Force Sensor

Transparent and Stretchable Interactive Human Machine Interface Based on Patterned Graphene Heterostructures

Expression of longitudinal third-order transport coefficient in terms of α parameters and its validity

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