Piezoelectricity of chiral polymeric fiber and its application in biomedical engineering

Tajitsu, Yoshiro

doi:10.1109/tuffc.2008.746

Cited by 77 publications

(68 citation statements)

References 9 publications

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“…There are two optical isomers, i.e., L-and D-lactic acid, therefore, PLAs polymerized from either the poly-L-lactic acid (PLLA) or poly-D-lactic acid (PDLA) are also chiral. It is known that orienting the PLLA and PDLA films by stretching imparts shear piezoelectricity [3][4][5][6][7][8][9]. In contrast, racemic mixture of PLLA and PDLA, i.e., poly-DL-lactic acid (PDLLA), have not shown piezoelectricity.…”

Section: Introductionmentioning

confidence: 99%

Polarized FT-IR Study of Uniaxially Aligned Electrospun Poly(DL-Lactic Acid) Fiber Films

Nobeshima

Sakai

Ishii

et al. 2016

J. Photopol. Sci. Technol.

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Randomly deposited or uniaxially aligned electrospun poly(DL-lactic acid) fibers were prepared, and the molecular orientation was characterized by polarized Fourier-transform infrared (FT-IR) spectroscopy. For randomly deposited fibers, the parallel polarized FT-IR spectrum was the same as that of the perpendicularly polarized spectrum, indicating that there was no specific molecular orientation in this electrospun film. In contrast, for the uniaxially aligned sample, IR band intensities and the positions of C-O-C stretching changed when the IR beam was polarized either parallel or perpendicular to the fiber axis. Because the C-O-C stretching is parallel to the polymer backbone, this change indicates that the polymer chain in the fiber was stretched and aligned. The dichroic ratio of the band at 1090 cm −1 , attributed C-O-C stretching, was 2.9. Furthermore, the high-frequency shift of the peaks in its perpendicularly IR spectra suggests that the polymer chains in the fiber were tightly packed during the electrospinning process.

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Section: Introductionmentioning

confidence: 99%

Polarized FT-IR Study of Uniaxially Aligned Electrospun Poly(DL-Lactic Acid) Fiber Films

Nobeshima

Sakai

Ishii

et al. 2016

J. Photopol. Sci. Technol.

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“…We found an almost linear relationship between applied ac voltage and the length of the line of the apsides. These results show that the tip motion of PLLA fibers depends on the amplitude, frequency, wave shape and direction of the electric field [12][13][14][15]. Downloaded by [University of California Santa Cruz] at 12:29 10 October 2014 In summary, we have successfully demonstrated the control of the bending motion of the PLLA fiber due to its piezoelectricity by applying electric filed.…”

Section: Elliptical Motionmentioning

confidence: 63%

“…3, another possible mechanism may be more important than shear piezoelectricity [12][13][14][15], which is the unimorph mechanism. The electrodes can only activate one half of the fiber, as seen in Fig.…”

Section: Distribution Of Electric Fieldmentioning

confidence: 99%

Basic Study of Controlling Piezoelectric Motion of Chiral Polymeric Fiber

Tajitsu

2009

Ferroelectrics

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We studied a novel technique for electrically controlling the piezoelectric motion of the fiber of poly-(L-lactic acid) (PLLA), which is a type of chiral polymer. A PLLA fiber (30 µm diameter) drawn seven times with a piezoelectric constant of 25 pC/N was prepared. First, it was reported that a bending motion due to the shear piezoelectricity of the PLLA fiber can be basically controlled by applying an electric field. Then, it was found that the targeting piezoelectric actuator that we used to study the tip motion of the free end of PLLA fibers whose other end was fixed, could be moved in a zig-zag pattern on a straight line, and/or along an ellipsoidal orbit, by the application of an electric field.

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“…Tajitsu et al [55,56] recently developed electrically controlled PLLA fiber using this concept for the applications such as tweezers. PLLA fibers with high crystallinity and high orientation of crystallites were fabricated using highspeed spinning.…”

Section: Piezoelectric Effectmentioning

confidence: 99%