摘要
报道了在128°旋转Y切割X传播方向的LiNbO3基片上研制了微流体驱动器件。RF信号经功率放大器放大后馈入叉指换能器,由它激发的声表面波驱动微流体。为减少由于声波辐射引起微流体温度上升,提出了间接微流体驱动方法,即通过声表面波驱动中间微粒,再由此驱动目标微流体。实验表明:声表面波驱动微流体所需的RF信号功率决定于微流体体积和粘性;采用间接方法驱动1μL50%甘油水液滴,在10V的RF信号持续5min下其温度变化仅0.5℃,而相同条件下直接驱动该液滴,其温度上升12.6℃。
A device for driving a droplet fabricated on 128° Y cut, X（propagsting diretion） LiNbOa is reported. A RF signal was fed on the interdigital transducer after had been amplified and its exciting surface acoustic wave was used for driving the droplet. A method of driving a droplet indirectly is also given in the paper in order to overcome the droplet temperature rising from SAW radiating into the droplet, in which a microparticle is driven by SAW and then drives the droplet. Experiments show that surface acoustic wave can drive a droplet and its needed RF signal powers vary with the droplet volumes and the droplet viscosity. Experiments also show that the temperature of a 1μL 50% glycerine droplet is only raised up 0.5℃ by indirectly driving method and 12.6℃ by directly driving method under 10 V RF signal after 5 min time.
出处
《传感技术学报》
CAS
CSCD
北大核心
2008年第10期1808-1811,共4页
Chinese Journal of Sensors and Actuators
基金
宁波市自然基金资助项目(2007A610005)
宁波大学校基金资助项目(XY0600048)
关键词
片上实验室
微流体驱动
声表面波
超声辐射
叉指换能器
lab on a chip
droplets driving
surface acoustic wave
ultrasonic radiation
interdigital transducer
