Jia Kun, Yang Keji, Fan Zongwei, Ju Bing-Feng
The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, People's Republic of China.
Rev Sci Instrum. 2012 Jan;83(1):014902. doi: 10.1063/1.3676636.
Controlled movement and pick up of small object from a rigid surface is a primary challenge in many applications. In this paper, a contactless methodology of picking up micro-particles within deionized water from rigid surfaces by acoustic radiation force is presented. In order to achieve this, an acoustic radiation force was generated by 1.75 MHz transducers. A custom built setup facilitates the optimization of the sound field by varying the parameters such as sound source size and source position. The three-dimensional pressure distributions are measured and its relative sound field is also characterized accordingly. The standing wave field has been formed and it is mainly composed of two obliquely incident plane waves and their reflectors. We demonstrated the gripping and positioning of silica beads, SiO(2), and aluminum micro-particles of 100 μm to 500 μm in size with this method using acoustic radiation force. The acoustic radiation force generated is well controlled, contactless, and in the tens of nano-Newton range which allowed us to manipulate relative big micro objects such as MEMS components as well as moving objects such as living cells. The proposed method provided an alternative form of contactless operating environment with scalable dimensions suitable for the manipulating of small objects. This permits high-throughput processing and reduction in time required for MEMS assembling, cell biomechanics, and biotechnology applications.
从刚性表面进行受控移动并拾取小物体是许多应用中的主要挑战。本文提出了一种通过声辐射力从刚性表面拾取去离子水中的微粒的非接触式方法。为实现这一点，由1.75 MHz的换能器产生声辐射力。定制的装置通过改变诸如声源尺寸和源位置等参数来促进声场的优化。测量了三维压力分布，并相应地对其相对声场进行了表征。形成了驻波场，它主要由两个斜入射平面波及其反射器组成。我们用这种方法利用声辐射力展示了对尺寸为100μm至500μm的二氧化硅珠、SiO₂和铝微粒的抓取和定位。所产生的声辐射力得到了很好的控制，是非接触式的，且在几十纳牛顿范围内，这使我们能够操纵相对较大的微物体，如MEMS组件以及诸如活细胞等移动物体。所提出的方法提供了一种非接触式操作环境的替代形式，其尺寸可扩展且适合于操纵小物体。这允许进行高通量处理，并减少MEMS组装、细胞生物力学和生物技术应用所需的时间。
