Damping and electromechanical energy losses in the piezoelectric polymer PVDF

Виноградов, А. М.; Schmidt, V. Hugo; Tuthill, G. F.; Bohannan, Gary W.

doi:10.1016/j.mechmat.2003.04.002

Cited by 83 publications

(42 citation statements)

References 17 publications

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“…The PVDF hollow fiber membrane used in this study consists of hydrogen atoms (positively charged) and fluoride atoms (negatively charged) and behaves as a hydrophobic polymer [19][20] . In addition, most bacterial cell surfaces exhibit a net negative charge under common physiological conditions [21][22] .…”

Section: Resultsmentioning

confidence: 99%

Effect of the cross linkers’ concentration on the immobilization of recombinant Escherichia coli cells on hollow fiber membrane for excretion of cyclodextrin glucanotransferase (CGTase)

CheMan

Illias

Sulaiman

et al. 2017

Chem. Eng. Res. Bull.

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Abstract:The excretion of recombinant proteins into the culture medium is a preferred approach over cytoplasmic expression because of the high specific activity and ease of purification. However, cell lysis is one of a major problem during the excretion of recombinant protein due to the pressure build up in the periplasmic space through overproduction of the expressed recombinant protein. Cell immobilization is a promising solution for the improvement of protein excretion with reduction in cell lysis. In this study, the effect of cross linkers concentrations on the process of cell immobilization for the cyclodextringlucanotransferase (CGTase) excretion and cell viability were investigated. The hollow fiber membrane was treated using different concentrations (0.3, 0.67 and 1%) of cross linkers namely glutaraldehyde (GA), poly-L-lysine (PLL) and polyethylenimine (PEI). The optimum concentration of cross linkers was found to be 0.3% with the high excretion of CGTase. Interestingly, the immobilized cell on the non-treated hollow fiber membrane showed up to 15% increment of CGTase excretion with 55% reduction of cell lysis, as compared to the immobilized cells on the treated hollow fiber membrane. It could be concluded that, the low concentration of cross linkers exhibited the highest CGTase excretion. Moreover, the non-treated hollow fiber membrane is a promising approach for attachment of cells to the membrane without requiring treatment with any chemicals for the production of recombinant enzyme.

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Section: Resultsmentioning

confidence: 99%

Effect of the cross linkers’ concentration on the immobilization of recombinant Escherichia coli cells on hollow fiber membrane for excretion of cyclodextrin glucanotransferase (CGTase)

CheMan

Illias

Sulaiman

et al. 2017

Chem. Eng. Res. Bull.

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“…Although some polymers can exhibit piezoelectric characteristics [61], most piezoelectric actuators are based on piezoceramics. Piezoceramic materials have been widely studied and used since the second world war to manufacture ultrasonic transducers.…”

Section: Types Of Piezoelectric Actuatorsmentioning

confidence: 99%

Smart Actuation for Helicopter Rotorblades

Paternoster¹,

Loendersloot²,

Boer³

et al. 2012

Smart Actuation and Sensing Systems - Recent Advances and Future Challenges

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“…[3][4][5] Polyvinylidene fluoride (PVDF) is the most popular piezoelectric polymer material. [6] The curie temperature (T c ) of PVDF is 120°C, which is below its melting point 159°C. [7] The operating temperature range of PVDF is -20 to 70°C, [6,7] which restricts the high-and low-temperature applications of PVDF.…”

Section: Introductionmentioning

confidence: 99%

“…[6] The curie temperature (T c ) of PVDF is 120°C, which is below its melting point 159°C. [7] The operating temperature range of PVDF is -20 to 70°C, [6,7] which restricts the high-and low-temperature applications of PVDF. Although there has been a concerted effort to develop piezoelectric polymers for a wide range of operating temperatures, no effective alternative to PVDF has yet been found.…”

Section: Introductionmentioning

confidence: 99%

“…Although there has been a concerted effort to develop piezoelectric polymers for a wide range of operating temperatures, no effective alternative to PVDF has yet been found. [6,8,9] It is known that the T c of ceramic piezoelectric materials is higher than that of polymer piezoelectric materials. However, ceramic piezoelectric materials are brittle and hard, and require high temperatures during the preparation processes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of Oriented Aluminum Nitride Thin Films on Polyimide Films and Piezoelectric Response with High Thermal Stability and Flexibility

Akiyama

Morofuji

Kamohara

et al. 2007

Adv Funct Materials

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Abstractc‐Axis oriented aluminum nitride (AlN) thin films are successfully prepared on amorphous polyimide films by radiofrequency magnetron reactive sputtering at room temperature. Structural analysis shows that the AlN films have a wurtzite structure and consist of c‐axis oriented columnar grains about 100 nm wide. The full width at half maximum of the X‐ray diffraction rocking curves and piezoelectric coefficient d33 of the AlN films are 8.3° and 0.56 pC N–1, respectively. The AlN films exhibit a piezoelectric response over a wide temperature range, from –196 to 300 °C, and can measure pressure within a wide range, from pulse waves of hundreds of pascals to 40 MPa. Moreover, the sensitivity of the AlN films increases with the number of times it was folded, suggesting that we can control the sensitivity of the AlN films by changing the geometric form. These results were achieved by a combination of preparing the oriented AlN thin films on polyimide films, and sandwiching the AlN and polymer films between top and bottom electrodes, such as Pt/AlN/polyimide/Pt. They are thin (less than 10 μm), self powered, adaptable to complex contours, and available in a variety of configurations. Although AlN is a piezoelectric ceramic, the AlN films are flexible and excellent in mechanical shock resistance.

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Damping and electromechanical energy losses in the piezoelectric polymer PVDF

Cited by 83 publications

References 17 publications

Effect of the cross linkers’ concentration on the immobilization of recombinant Escherichia coli cells on hollow fiber membrane for excretion of cyclodextrin glucanotransferase (CGTase)

Effect of the cross linkers’ concentration on the immobilization of recombinant Escherichia coli cells on hollow fiber membrane for excretion of cyclodextrin glucanotransferase (CGTase)

Smart Actuation for Helicopter Rotorblades

Preparation of Oriented Aluminum Nitride Thin Films on Polyimide Films and Piezoelectric Response with High Thermal Stability and Flexibility

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