基于微流控芯片的图案化ZnO纳米材料阵列的合成

Synthesis of Patterned ZnO Nanomaterials Array Based on Microfluidic Chip

设计并制备了集成微液滴阵列的微流控芯片,通过微腔室捕获液滴形成稳定的液滴阵列,用于图案化ZnO纳米材料的合成。利用液滴诱导和两相流体剪切的模式分别在两种不同的芯片结构中构建微液滴阵列,探究了不同表面活性剂质量分数和不同流体体积流量条件下微液滴阵列的稳定性,并以稳定的微液滴阵列合成单元制备氧化锌纳米材料,分析反应物更新对ZnO纳米材料的形貌和晶体结构的影响。结果表明,两相流体剪切模式芯片中形成的微液滴阵列更为稳定,不需要在矿物油中添加表面活性剂就可以成功构建微液滴阵列,但油相体积流量过大(1600μL/h)或者过小(5μL/h)会导致微液滴阵列不能成功构建。两相流体剪切模式芯片二在生长时间2 h、更新间隔时间10 min条件下合成的ZnO纳米棒形貌均一,有望实现高效的微液滴阵列构建,并应用于纳米材料的原位合成和分析。

A microfluidic chip integrated with micro-droplet arrays was designed and fabricated.The stable droplet arrays were formed by trapping droplets in the micro chambers on the chip for synthesis of patterned ZnO nanomaterials.The micro droplet arrays were constructed in two different chip structures by droplet guidence and two-phase fluid shear modes,respectively.The stabilities of micro droplet arrays under the conditions of different mass fractions of surfactant and different volume flows were investigated,and the ZnO nanomaterial was prepared with the stable micro droplet array synthesis unit.The effect of the reactant renewal on the morphology and crystal structure of the ZnO nanomaterial was analyzed.The results show that the micro droplet array formed in the chip with two-phase fluid shear mode is more stable and can be successfully constructed without adding surfactants to the mineral oil.However,when the volume flow of oil phase is too large(1600μL/h)or too small(5μL/h),the droplet array cannot be successfully constructed.The morphologies of the ZnO nanorods synthesized by the chip 2 with two-phase fluid shear mode under the conditions of growth time of 2 h and update interval time of 10 min are uniform,which is expected to achieve efficient construction of micro droplet arrays and utilization in the in-situ synthesis and analysis of nanomaterials.