| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-contact manipulation technique of easily controlling a flow direction of microscopic objects in a liquid medium in which the microscopic objects are dispersed, without increasing output of an ultrasonic transducer.SOLUTION: An ultrasonic non-contact micromanipulation method uses a solid cell 1. The solid cell 1 includes: a microchannel 2 which is constituted by wall parts 3A and 3B and a bottom part 4, and has an inlet 5 and outlets 6A and 6B for a liquid medium in which microscopic objects are dispersed. The microchannel 2 includes: a linear flow channel 2A; a branch flow channel 2B branched in mid-course; and an accumulating place 7 provided at a branching-off point. An ultrasonic transducer 8 is attached on a side face of one wall part 3A of the solid cell 1 so as to be parallel with the linear flow channel. In the method, the liquid medium in which the microscopic objects are dispersed is made to flow in the microchannel, ultrasonic waves from the ultrasonic transducer 8 are propagated as traveling waves through a lower part of the microchannel and propagated in the microchannel as reflection waves at the curved wall part 3B of the microchannel facing a side face of the ultrasonic transducer, and by applying acoustic radiation pressure to the microscopic objects, a flow direction of the microscopic objects in the liquid medium is controlled. |
