为了合成粒径均一、单分散性好的金纳米粒子, 提出一种压电驱动式脉动微混合可控合成金纳米粒子的方法。该方法采用两腔三阀结构的压电微泵作为驱动源, 结合Y形微混合器, 基于两压电微泵脉动交叉式输出性能来实现多种不同混合模式的可控混合。利用Fluent软件对Y形微混合器内不同流量及频率下的混合效果进行了优化分析, 优选出了压电微泵的控制参数。在实验室内设计、制作了用于金纳米粒子可控合成的系统样机, 并开展了相应的金纳米粒子可控合成试验。试验结果表明: 电压为40 V, 频率为300 Hz时, 合成的金纳米粒子粒径较为均一, 分散性较好, 该结果验证了文中所提方法的可行性。此方法亦可应用于其他纳米粒子的可控合成。

To prepare gold nanoparticles with uniform sizes, fine morphology and good monodispersity, a synthesis-controlled method was presented by using the pulsating micromixing technology actuated by PZT actuators. For this synthesis method, the PZT micropumps with dual-chambers and three check valves were acted as the driving source, a Y type micro-channel was used as the mixer, and the controllable mixing with different mixing modes could be implemented based on the pulsating output performance of the micropumps in cross phases. Using the FLUENT software, the mixing effect for the Y type micro-mixer under different flow rates and frequencies was analyzed optimally, and the control parameters of PZT micropumps were optimized. A system prototype worked at a lab was designed for the synthesis-controlled of gold nanoparticles, and the corresponding preparation tests of gold nanoparticles were also carried out. The test results show that under a voltage of 40 V, a frequency of 300 Hz, the gold nanoparticles prepared have uniform sizes, good monodispersity, which verifies the feasibility of the proposed method preliminarily. This method can also be applied in the controllable synthesis of other nanoparticles.