Permanent Polarity and Piezoelectricity of Electrospun <i>α</i>‐Helical Poly(<i>α</i>‐Amino Acid) Fibers

Farrar, Dawnielle; Ren, Kailiang; Cheng, Derek; Kim, Sungjoo; Moon, Wonkyu; Wilson, William L.; West, James E.; Yu, S. Michael

doi:10.1002/adma.201101733

Cited by 100 publications

(79 citation statements)

References 31 publications

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“…17 More recently, Yu et al have reported that electrospun PBLG microfibers (B4 mm) have a permanent polarity and piezoelectricity. 18 However, studies on the effect of the ordered structures of the spinning solution on the internal structure and molecular orientation of electrospun PBLG nanofibers have not yet been conducted.…”

Section: Introductionmentioning

confidence: 99%

Preparation of poly(γ-benzyl-L-glutamate) nanofibers by electrospinning from isotropic and biphasic liquid crystal solutions

Tsuboi

Marcelletti

Matsumoto

et al. 2012

Polym J

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Liquid crystal polymer (LCP) nanofibers were prepared by electrospinning from isotropic and biphasic poly(c-benzyl-L-glutamate) (PBLG)/dichloromethane-pyridine solutions. The prepared fibers were characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, polarized optical microscopy, wide-angle X-ray diffraction and polarized micro-Raman spectroscopy. The as-spun PBLG fiber from the isotropic solutions had an undulating orientation of closed-packed a-helices similar to a serpentine trajectory in their internal structures. The as-spun PBLG fibers from the biphasic solutions that contained the LC phase had uniaxially oriented hexagonal lattices of a-helices along the fiber axis. These results indicated that the orientation of the ordered structure of the electrospun lyotropic LCP fibers can be controlled by the initial microstructure of the spinning solution.

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Section: Introductionmentioning

confidence: 99%

Preparation of poly(γ-benzyl-L-glutamate) nanofibers by electrospinning from isotropic and biphasic liquid crystal solutions

Tsuboi

Marcelletti

Matsumoto

et al. 2012

Polym J

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“…10,12 The PBLG film was cut at a 45 angle to the fiber direction and coated with Al on both the top and bottom surfaces before it was attached to a Mylar film (25 lm) to create a diaphragm structure. The microphone's responses as velocity and pressure sensors in the audio frequency range have been tested, and in both cases, the sensitivity was around À60 dBV/Pa, which is about 30 dB below that of a typical electret microphone.…”

Section: Resultsmentioning

confidence: 99%

“…9 We recently reported fabrication of thermally stable piezoelectric nanofibers by electrospinning, poly(c-benzyl-a,L-glutamate) (PBLG), a synthetic poly(amino acid) with stable alpha helical conformation. 10 This helical polymer contains a large electrical dipole due to a collection of hydrogen bonds pre-aligned in the direction of the helical axes. When the polymer solution is subjected to electrospinning condition, the dipole of the PBLG interacts with the external electric field, and nanofibers are formed with individual PBLG helices poled in the direction of the fiber.…”

Section: Introductionmentioning

confidence: 99%

Planar microphone based on piezoelectric electrospun poly(γ-benzyl-α,L-glutamate) nanofibers

Ren

West

2014

The Journal of the Acoustical Society of America

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Velocity and pressure microphones composed of piezoelectric poly(γ-benzyl-α,L-glutamate) (PBLG) nanofibers were produced by adhering a single layer of PBLG film to a Mylar diaphragm. The device exhibited a sensitivity of −60 dBV/Pa in air, and both pressure and velocity response showed a broad frequency response that was primarily controlled by the stiffness of the supporting diaphragm. The pressure microphone response was ±3 dB between 200 Hz and 4 kHz when measured in a semi-anechoic chamber. Thermal stability, easy fabrication, and simple design make this single element transducer ideal for various applications including those for underwater and high temperature use.

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“…(9) The piezoelectric PBLG fibers are characterized as having high flexibility, high toughness, high electric dipole density, and good thermal stability. (6) The PBLG fibers show excellent piezoelectric properties that could be applied in the field of microcomponents.…”

Section: Introductionmentioning

confidence: 99%

“…(5) In 2011, Farrar et al used electrospun PBLG fibers to measure the d33 piezoelectric coefficient of 25 pC N −1 . (6) In 2012, Kuo and colleagues studied PBLG combined with fluorescent substances. (7) The main concept of this research is green energy.…”

Section: Introductionmentioning

confidence: 99%

Poly(γ-benzyl α, l-glutamate) in Cylindrical Near-Field Electrospinning Fabrication and Analysis of Piezoelectric Fibers

2014

Sensors and Materials

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In this study, a cylindrical near-field electrospinning (CNFES) process was used to fabricate poly(γ-benzyl α, l-glutamate) (PBLG) fibers with permanent piezoelectricity. To analyze the piezoelectricity of various PBLG fibers, PBLG weight percentage, rotating tangential speed, electric field, and fiber diameter were investigated. The average diameter of the electrospun PBLG fiber is in the range from 4.37 to 25 μm with the optimum parameters (PBLG concentration: 18 wt%, tangential collection velocity: 942.4778 mm/s, and electric field: 6×10 6 V/m). Fourier transform infrared spectroscopy (FTIR) was used to characterize PBLG nonwoven fiber fabrics (NFFs) made by the CNFES process. The PBLG NFFs with high absorption peak at 1650 cm −1 corresponding to α-helix piezoelectric structures were demonstrated. In the experiment, the electrical energy output of one single PBLG fiber was characterized. The maximum power output is 138.42 pW with a load resistance of 8 MΩ. However, one single polyvinylidene fluoride (PVDF) fiber was also tested under the same condition and measurement. The power output is up to 265.81 pW with a load resistance of 6 MΩ. The results show that the power generation of the PVDF fibers exceeds that of PBLG fibers by 68%.

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Permanent Polarity and Piezoelectricity of Electrospun α‐Helical Poly(α‐Amino Acid) Fibers

Cited by 100 publications

References 31 publications

Preparation of poly(γ-benzyl-L-glutamate) nanofibers by electrospinning from isotropic and biphasic liquid crystal solutions

Preparation of poly(γ-benzyl-L-glutamate) nanofibers by electrospinning from isotropic and biphasic liquid crystal solutions

Planar microphone based on piezoelectric electrospun poly(γ-benzyl-α,L-glutamate) nanofibers

Poly(γ-benzyl α, l-glutamate) in Cylindrical Near-Field Electrospinning Fabrication and Analysis of Piezoelectric Fibers

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