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Yong Qing Fu - One of the best experts on this subject based on the ideXlab platform.

  • nebulization uSing zno Si Surface acoustic wave devices with focused interdigitated transducers
    Surface & Coatings Technology, 2019
    Co-Authors: Jian Zhou, Shurong Dong, Huigao Duan, Yifan Li, Yong Qing Fu
    Abstract:

    Abstract Propagation of Surface acoustic waves (SAWs) on bulk piezoelectric substrates such as LiNbO3 and quartz, exhibits an in-plane anisotropic effect due to their crystal cut orientations. Thin film SAW devices, such as those based on ZnO or AlN, offer potential advantages, including isotropic wave velocities in all in-plane directions, higher power handling capability, and potentially lower failure rates. This paper reports experimental and Simulation results of nebulization behaviour for water droplets uSing ZnO/Si Surface acoustic wave devices with focused interdigital transducers (IDTs). Post-depoSition annealing of the films at various temperatures was applied to improve the quality of the sputtering-depoSited ZnO films, and 500 °C was found to be the optimal annealing temperature. Thin film ZnO/Si focused SAW devices were fabricated uSing the IDT deSigns with arc angles ranging from 30° to 90°. Nebulization was Significantly enhanced with increaSing the arc angles of the IDTs, e.g., increased nebulization rate, reduced critical powers required to initialise nebulization, and concentration of the nebulised plume into a narrower Size of spray. Effects of applied RF power and droplet Size have been systematically studied, and increased RF power and reduced droplet Size Significantly enhanced the nebulization phenomena.

  • nebulization of water glycerol droplets generated by zno Si Surface acoustic wave devices
    Microfluidics and Nanofluidics, 2015
    Co-Authors: A P Dennison, Xiao Tao Zu, C L Mackay, Patrick R R Langridgesmith, A.j. Walton, Yifan Li, Yong Qing Fu
    Abstract:

    Efficient nebulization of liquid sesSile droplets (water and water/glycerol mixtures) was investigated uSing standing waves generated uSing ZnO/Si Surface acoustic wave (SAW) devices under different RF powers, frequencies and liquid viscoSity (varied glycol concentrations in water). At such high RF powers, there are strong competitions between vertical jetting and nebulization. At lower SAW frequencies of 12.3 and 23.37 MHz, Significant capillary waves and large satellite droplets were generated before nebulization could be observed. At frequencies between 23.37 and 37.2 MHz, spreading, displacement or occaSionally jetting of the parent sesSile droplet was frequently observed before a Significant nebulization occurred. When the SAW frequencies were increased from 44.44 to 63.3 MHz, the minimum RF power to initiate droplet nebulization was found to increase Significantly, and jetting of the parent droplet before nebulization became Significant, although the average Size of the nebulized particles and ejected satellite droplets appeared to decrease with an increase in frequency. With the increase of glycerol concentration in the test sesSile droplets (or increase in liquid viscoSity), nebulization became difficult due to the increased SAW damping rate inSide the liquid. Acoustic heating effects were characterized to be inSignificant and did not show apparent contributions to the nebulization process due to Silicon substrate’s natural effect as an effective heat Sink and the employment of a metallic holder beneath the ZnO/Si SAW device substrates.

Yifan Li - One of the best experts on this subject based on the ideXlab platform.

  • nebulization uSing zno Si Surface acoustic wave devices with focused interdigitated transducers
    Surface & Coatings Technology, 2019
    Co-Authors: Jian Zhou, Shurong Dong, Huigao Duan, Yifan Li, Yong Qing Fu
    Abstract:

    Abstract Propagation of Surface acoustic waves (SAWs) on bulk piezoelectric substrates such as LiNbO3 and quartz, exhibits an in-plane anisotropic effect due to their crystal cut orientations. Thin film SAW devices, such as those based on ZnO or AlN, offer potential advantages, including isotropic wave velocities in all in-plane directions, higher power handling capability, and potentially lower failure rates. This paper reports experimental and Simulation results of nebulization behaviour for water droplets uSing ZnO/Si Surface acoustic wave devices with focused interdigital transducers (IDTs). Post-depoSition annealing of the films at various temperatures was applied to improve the quality of the sputtering-depoSited ZnO films, and 500 °C was found to be the optimal annealing temperature. Thin film ZnO/Si focused SAW devices were fabricated uSing the IDT deSigns with arc angles ranging from 30° to 90°. Nebulization was Significantly enhanced with increaSing the arc angles of the IDTs, e.g., increased nebulization rate, reduced critical powers required to initialise nebulization, and concentration of the nebulised plume into a narrower Size of spray. Effects of applied RF power and droplet Size have been systematically studied, and increased RF power and reduced droplet Size Significantly enhanced the nebulization phenomena.

  • nebulization of water glycerol droplets generated by zno Si Surface acoustic wave devices
    Microfluidics and Nanofluidics, 2015
    Co-Authors: A P Dennison, Xiao Tao Zu, C L Mackay, Patrick R R Langridgesmith, A.j. Walton, Yifan Li, Yong Qing Fu
    Abstract:

    Efficient nebulization of liquid sesSile droplets (water and water/glycerol mixtures) was investigated uSing standing waves generated uSing ZnO/Si Surface acoustic wave (SAW) devices under different RF powers, frequencies and liquid viscoSity (varied glycol concentrations in water). At such high RF powers, there are strong competitions between vertical jetting and nebulization. At lower SAW frequencies of 12.3 and 23.37 MHz, Significant capillary waves and large satellite droplets were generated before nebulization could be observed. At frequencies between 23.37 and 37.2 MHz, spreading, displacement or occaSionally jetting of the parent sesSile droplet was frequently observed before a Significant nebulization occurred. When the SAW frequencies were increased from 44.44 to 63.3 MHz, the minimum RF power to initiate droplet nebulization was found to increase Significantly, and jetting of the parent droplet before nebulization became Significant, although the average Size of the nebulized particles and ejected satellite droplets appeared to decrease with an increase in frequency. With the increase of glycerol concentration in the test sesSile droplets (or increase in liquid viscoSity), nebulization became difficult due to the increased SAW damping rate inSide the liquid. Acoustic heating effects were characterized to be inSignificant and did not show apparent contributions to the nebulization process due to Silicon substrate’s natural effect as an effective heat Sink and the employment of a metallic holder beneath the ZnO/Si SAW device substrates.

Jian Zhou - One of the best experts on this subject based on the ideXlab platform.

  • nebulization uSing zno Si Surface acoustic wave devices with focused interdigitated transducers
    Surface & Coatings Technology, 2019
    Co-Authors: Jian Zhou, Shurong Dong, Huigao Duan, Yifan Li, Yong Qing Fu
    Abstract:

    Abstract Propagation of Surface acoustic waves (SAWs) on bulk piezoelectric substrates such as LiNbO3 and quartz, exhibits an in-plane anisotropic effect due to their crystal cut orientations. Thin film SAW devices, such as those based on ZnO or AlN, offer potential advantages, including isotropic wave velocities in all in-plane directions, higher power handling capability, and potentially lower failure rates. This paper reports experimental and Simulation results of nebulization behaviour for water droplets uSing ZnO/Si Surface acoustic wave devices with focused interdigital transducers (IDTs). Post-depoSition annealing of the films at various temperatures was applied to improve the quality of the sputtering-depoSited ZnO films, and 500 °C was found to be the optimal annealing temperature. Thin film ZnO/Si focused SAW devices were fabricated uSing the IDT deSigns with arc angles ranging from 30° to 90°. Nebulization was Significantly enhanced with increaSing the arc angles of the IDTs, e.g., increased nebulization rate, reduced critical powers required to initialise nebulization, and concentration of the nebulised plume into a narrower Size of spray. Effects of applied RF power and droplet Size have been systematically studied, and increased RF power and reduced droplet Size Significantly enhanced the nebulization phenomena.

A P Dennison - One of the best experts on this subject based on the ideXlab platform.

  • nebulization of water glycerol droplets generated by zno Si Surface acoustic wave devices
    Microfluidics and Nanofluidics, 2015
    Co-Authors: A P Dennison, Xiao Tao Zu, C L Mackay, Patrick R R Langridgesmith, A.j. Walton, Yifan Li, Yong Qing Fu
    Abstract:

    Efficient nebulization of liquid sesSile droplets (water and water/glycerol mixtures) was investigated uSing standing waves generated uSing ZnO/Si Surface acoustic wave (SAW) devices under different RF powers, frequencies and liquid viscoSity (varied glycol concentrations in water). At such high RF powers, there are strong competitions between vertical jetting and nebulization. At lower SAW frequencies of 12.3 and 23.37 MHz, Significant capillary waves and large satellite droplets were generated before nebulization could be observed. At frequencies between 23.37 and 37.2 MHz, spreading, displacement or occaSionally jetting of the parent sesSile droplet was frequently observed before a Significant nebulization occurred. When the SAW frequencies were increased from 44.44 to 63.3 MHz, the minimum RF power to initiate droplet nebulization was found to increase Significantly, and jetting of the parent droplet before nebulization became Significant, although the average Size of the nebulized particles and ejected satellite droplets appeared to decrease with an increase in frequency. With the increase of glycerol concentration in the test sesSile droplets (or increase in liquid viscoSity), nebulization became difficult due to the increased SAW damping rate inSide the liquid. Acoustic heating effects were characterized to be inSignificant and did not show apparent contributions to the nebulization process due to Silicon substrate’s natural effect as an effective heat Sink and the employment of a metallic holder beneath the ZnO/Si SAW device substrates.

K Hirokawa - One of the best experts on this subject based on the ideXlab platform.