Papers by Author: Zhi Yuan Yao

Abstract: The glass nanopore produced by the physical method has better physical characteristics, higher strength, stronger stability, longer life and other significant features compared with the chemical method. The purpose of this paper is to study DNA sequencing (973 project) to provide experimental basis for preparation of glass capillary 5nm 3D nanochannel In this paper, we design a set of glass capillary tension system which is controlled by laser heating and linear ultrasonic motor and produced successfully the device for the preparation of nanopore below 50 nm. In addition, the use of micro droplet generation system has carried out preliminary characterization of nanopore drawn devices. Seen from the characterization, the nanopore device fabricated can indeed produce a through-hole.

Abstract: The nanofluidic devices with the nanopores are the foundation of the third generation of the DNA sequencing technology. Comparing with the traditional nanopores constructed on the nanofilms, the nanofluidic devices made by the SiO2 have higher stiffness, strength and stability. We study on the structure design of glass capillary tension feed system, used in manufacture of the nanofluidic devices with the nanopores. Firstly, we design glass capillary tension feed system, including the mechanical moving parts, heating parts and the control parts, which is used to heat glass capillary and stretch it to get glass capillary with a smaller inner diameter in need. Among them, the control accuracy of the moving parts is up to 1μm, the heating range of heating parts is less than 5mm, and the temperature can reach 1500 ̊C. Then we make a prototype, and do some experiments with it. According to the experiment results, the system can be used for glass capillary tension, and the inner diameter of the nanoglass capillary stretched by this system is as small as 500 nm.

Abstract: During the experiment of cell poking, it is required that the point of a probe is aimed at the cell with the help of a precision motion platform, and then, controlled by this motion platform, the tip of the probe pokes into the cell. When these operations are done, the driving force of this platform will be removed. But within a certain period (for example, an hour), the platform doesn’t stop moving. This kind of movement, which should be only several microns, is termed in this paper as the mechanical drift of ultrasonic linear motors. Experiments show that the forms used for clamping the stator is one of the factors that affect the mechanical drift. It is studied through experiments the impacts of several clamping forms on mechanical drift, the drift value’s relationship with the slide rail’s damping and the motor’s step size, and how the drift direction is related to the motion direction. The mechanism of mechanical drift of ultrasonic linear motors has also been explored preliminarily. This kind of research will facilitate refinements of the design and control methods for ultrasonic linear motor as well as motion platforms.

Abstract: This paper proposes an ultrasonic knife system for MEMS packaging. The ultrasonic knife system is consisted of an ultrasonic transducer, a cutter and a gripper feeder. The ultrasonic transducer engenders high frequency vibration, which lead to the resonance of the structure. Amplitude transformer can magnify the amplitude. By the impact and collision of the cutter, the material can be cut through, and the high temperature created by high-frequency vibration can do the welding. The structure is designed and optimized by the finite element method, and a model machine is produced. According to the experimental results, the ultrasonic knife system has the virtues of high cutting force and better wedding feature, which are suitable for MEMS packaging.