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Design and Development of Micro-Power Generating Device for Biomedical Applications of Lab-on-a-Disc.

Joseph K, Ibrahim F, Cho J, Thio TH, Al-Faqheri W, Madou M - PLoS ONE (2015)

Bottom Line: We have successfully demonstrated that at the spinning speed of 800 revolutions per minute (RPM) the piezoelectric film-based generator is able to produce up to 24 microwatts using 6 sets of films and the magnetic induction-based generator is capable of producing up to 125 milliwatts using 6 stacks of coil.The heating system was able to achieve a temperature of 58.62 °C at 2200 RPM.This development of lab-on-a-disc micro power generators preserves the portability standards and enhances the future biomedical applications of centrifugal microfluidic platforms.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia; Centre for Innovations in Medical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.

ABSTRACT
The development of micro-power generators for centrifugal microfluidic discs enhances the platform as a green point-of-care diagnostic system and eliminates the need for attaching external peripherals to the disc. In this work, we present micro-power generators that harvest energy from the disc's rotational movement to power biomedical applications on the disc. To implement these ideas, we developed two types of micro-power generators using piezoelectric films and an electromagnetic induction system. The piezoelectric-based generator takes advantage of the film's vibration during the disc's rotational motion, whereas the electromagnetic induction-based generator operates on the principle of current generation in stacks of coil exposed to varying magnetic flux. We have successfully demonstrated that at the spinning speed of 800 revolutions per minute (RPM) the piezoelectric film-based generator is able to produce up to 24 microwatts using 6 sets of films and the magnetic induction-based generator is capable of producing up to 125 milliwatts using 6 stacks of coil. As a proof of concept, a custom made localized heating system was constructed to test the capability of the magnetic induction-based generator. The heating system was able to achieve a temperature of 58.62 °C at 2200 RPM. This development of lab-on-a-disc micro power generators preserves the portability standards and enhances the future biomedical applications of centrifugal microfluidic platforms.

No MeSH data available.


(A) The output power at different frequencies of vibration and resistive load. The frequency when the maximum power measured is highlighted in the dotted box. (B) On the CD test: Variation of voltage output with spinning speed (RPM) for 300 seconds. No load applied to the system (C) On the CD test: Maximum voltage generated at each particular spinning rate (RPM). The solid line represents exponential fit to the experimental data with goodness of fit up to 0.9944 (n = 5).
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pone.0136519.g006: (A) The output power at different frequencies of vibration and resistive load. The frequency when the maximum power measured is highlighted in the dotted box. (B) On the CD test: Variation of voltage output with spinning speed (RPM) for 300 seconds. No load applied to the system (C) On the CD test: Maximum voltage generated at each particular spinning rate (RPM). The solid line represents exponential fit to the experimental data with goodness of fit up to 0.9944 (n = 5).

Mentions: The piezoelectric film generates AC voltage as a result of the periodic vibration (which is directly proportional to the spinning speed). From Fig 6A, we can clearly conclude that the average maximum power (in μW) of all four piezoelectric films tested occur during vibration frequencies between 42–48 Hz. This correlates with the hypothesis of Goldfarb et al. [45], which concluded that the maximum voltages are observed within the range of the film’s resonant frequency. It can also be deduced from the result shown that the resonant frequency of the piezoelectric films used in the experiment were in the range of 42–48 Hz. The effect of the resistive load on power generation is also shown in Fig 6A. A resistive load of 1 MΩ provides optimum power generation compared to other loads. This is consistent with the maximum power transfer theorem as it is closest to the piezoelectric film’s impedance at resonance [49, 50]. The variation observed suggests that the development of a modular piezoelectric power generation system depends on two factors: (i) the load applied to the system needs to be matched with the internal impedance of the system, and (ii) the vibration frequency range applied to the system need to be between 42 to 48Hz.


Design and Development of Micro-Power Generating Device for Biomedical Applications of Lab-on-a-Disc.

Joseph K, Ibrahim F, Cho J, Thio TH, Al-Faqheri W, Madou M - PLoS ONE (2015)

(A) The output power at different frequencies of vibration and resistive load. The frequency when the maximum power measured is highlighted in the dotted box. (B) On the CD test: Variation of voltage output with spinning speed (RPM) for 300 seconds. No load applied to the system (C) On the CD test: Maximum voltage generated at each particular spinning rate (RPM). The solid line represents exponential fit to the experimental data with goodness of fit up to 0.9944 (n = 5).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4589339&req=5

pone.0136519.g006: (A) The output power at different frequencies of vibration and resistive load. The frequency when the maximum power measured is highlighted in the dotted box. (B) On the CD test: Variation of voltage output with spinning speed (RPM) for 300 seconds. No load applied to the system (C) On the CD test: Maximum voltage generated at each particular spinning rate (RPM). The solid line represents exponential fit to the experimental data with goodness of fit up to 0.9944 (n = 5).
Mentions: The piezoelectric film generates AC voltage as a result of the periodic vibration (which is directly proportional to the spinning speed). From Fig 6A, we can clearly conclude that the average maximum power (in μW) of all four piezoelectric films tested occur during vibration frequencies between 42–48 Hz. This correlates with the hypothesis of Goldfarb et al. [45], which concluded that the maximum voltages are observed within the range of the film’s resonant frequency. It can also be deduced from the result shown that the resonant frequency of the piezoelectric films used in the experiment were in the range of 42–48 Hz. The effect of the resistive load on power generation is also shown in Fig 6A. A resistive load of 1 MΩ provides optimum power generation compared to other loads. This is consistent with the maximum power transfer theorem as it is closest to the piezoelectric film’s impedance at resonance [49, 50]. The variation observed suggests that the development of a modular piezoelectric power generation system depends on two factors: (i) the load applied to the system needs to be matched with the internal impedance of the system, and (ii) the vibration frequency range applied to the system need to be between 42 to 48Hz.

Bottom Line: We have successfully demonstrated that at the spinning speed of 800 revolutions per minute (RPM) the piezoelectric film-based generator is able to produce up to 24 microwatts using 6 sets of films and the magnetic induction-based generator is capable of producing up to 125 milliwatts using 6 stacks of coil.The heating system was able to achieve a temperature of 58.62 °C at 2200 RPM.This development of lab-on-a-disc micro power generators preserves the portability standards and enhances the future biomedical applications of centrifugal microfluidic platforms.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia; Centre for Innovations in Medical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.

ABSTRACT
The development of micro-power generators for centrifugal microfluidic discs enhances the platform as a green point-of-care diagnostic system and eliminates the need for attaching external peripherals to the disc. In this work, we present micro-power generators that harvest energy from the disc's rotational movement to power biomedical applications on the disc. To implement these ideas, we developed two types of micro-power generators using piezoelectric films and an electromagnetic induction system. The piezoelectric-based generator takes advantage of the film's vibration during the disc's rotational motion, whereas the electromagnetic induction-based generator operates on the principle of current generation in stacks of coil exposed to varying magnetic flux. We have successfully demonstrated that at the spinning speed of 800 revolutions per minute (RPM) the piezoelectric film-based generator is able to produce up to 24 microwatts using 6 sets of films and the magnetic induction-based generator is capable of producing up to 125 milliwatts using 6 stacks of coil. As a proof of concept, a custom made localized heating system was constructed to test the capability of the magnetic induction-based generator. The heating system was able to achieve a temperature of 58.62 °C at 2200 RPM. This development of lab-on-a-disc micro power generators preserves the portability standards and enhances the future biomedical applications of centrifugal microfluidic platforms.

No MeSH data available.