High bonding strength,low deformation and convenient procedure are all very important aspects in the microfluidic device fabrication process. In this paper,an improved microwave induced bonding technology is proposed ...High bonding strength,low deformation and convenient procedure are all very important aspects in the microfluidic device fabrication process. In this paper,an improved microwave induced bonding technology is proposed to fabricate microfluidic device based on methyl methacrylate( PMMA). This method employs pure ethanol as the bonding assisted solvent. The ethanol not only acts as the microwave absorbing material,but also works as the organic solvent in bath. The presented research work has shown that the bonding process can be completed in less than 45 s. Furthermore,the convenient bonding only applies microwave oven,beakers and binder clips. Then,we discuss effects of microwave power,bonding time on bonding strength and deformation of microstructures on PMMA microfluidic device. Finally,a 4 layers micro-mixer has been fabricated using the proposed bonding technique which includes 15 trapezoid micro-channels,9 T-type mix units and an X-type mix unit. Experimental results show that the proposed bonding method have some advantages compared with several traditional bonding technologies,such as hot pressing bonding,ultrasonic bonding and solvent assisted bonding methods in respect of bonding strength,deformation and bonding process. The presented work would be helpful for low coat mass production of multilayer polymer microfluidic devices in lab.展开更多
为探索纸质被动式农药微混合器的主要参数对农药混合效果的影响规律和增强农药混合的机理,选取Y型、Z型和方波型3种结构的纸质被动式农药微混合器,试验研究了每种微混合器不同参数条件对混合性能的影响,选出最优参数,再将最优参数下的3...为探索纸质被动式农药微混合器的主要参数对农药混合效果的影响规律和增强农药混合的机理,选取Y型、Z型和方波型3种结构的纸质被动式农药微混合器,试验研究了每种微混合器不同参数条件对混合性能的影响,选出最优参数,再将最优参数下的3种微混合器的混合性能进行对比。试验结果表明,Y型微混合器的最优参数为:入口速度0.010 m L/min、入口角30°,Z型微混合器的最优参数为:入口速度0.010 m L/min、峰间距3 mm、转角30°,方波型微混合器的最优参数为:入口速度0.010 m L/min、波高2 mm、波宽5 mm;在各自的最优参数条件下,Y型微混合器出口处混合强度为0.622 7,Z型微混合器出口处混合强度为0.690 2,方波型微混合器出口处混合强度为0.732 6,方波型微混合器混合性能最好;纸质被动式农药微混合器通道内部存在纸纤维,可以提供流体流动的动力,也可以加剧分子间的扩散作用,同时也在一定程度上限制了对流作用。展开更多
文摘High bonding strength,low deformation and convenient procedure are all very important aspects in the microfluidic device fabrication process. In this paper,an improved microwave induced bonding technology is proposed to fabricate microfluidic device based on methyl methacrylate( PMMA). This method employs pure ethanol as the bonding assisted solvent. The ethanol not only acts as the microwave absorbing material,but also works as the organic solvent in bath. The presented research work has shown that the bonding process can be completed in less than 45 s. Furthermore,the convenient bonding only applies microwave oven,beakers and binder clips. Then,we discuss effects of microwave power,bonding time on bonding strength and deformation of microstructures on PMMA microfluidic device. Finally,a 4 layers micro-mixer has been fabricated using the proposed bonding technique which includes 15 trapezoid micro-channels,9 T-type mix units and an X-type mix unit. Experimental results show that the proposed bonding method have some advantages compared with several traditional bonding technologies,such as hot pressing bonding,ultrasonic bonding and solvent assisted bonding methods in respect of bonding strength,deformation and bonding process. The presented work would be helpful for low coat mass production of multilayer polymer microfluidic devices in lab.
文摘为探索纸质被动式农药微混合器的主要参数对农药混合效果的影响规律和增强农药混合的机理,选取Y型、Z型和方波型3种结构的纸质被动式农药微混合器,试验研究了每种微混合器不同参数条件对混合性能的影响,选出最优参数,再将最优参数下的3种微混合器的混合性能进行对比。试验结果表明,Y型微混合器的最优参数为:入口速度0.010 m L/min、入口角30°,Z型微混合器的最优参数为:入口速度0.010 m L/min、峰间距3 mm、转角30°,方波型微混合器的最优参数为:入口速度0.010 m L/min、波高2 mm、波宽5 mm;在各自的最优参数条件下,Y型微混合器出口处混合强度为0.622 7,Z型微混合器出口处混合强度为0.690 2,方波型微混合器出口处混合强度为0.732 6,方波型微混合器混合性能最好;纸质被动式农药微混合器通道内部存在纸纤维,可以提供流体流动的动力,也可以加剧分子间的扩散作用,同时也在一定程度上限制了对流作用。