| With the continuous progress of materials science and technology,the preparation and application of micro-nano materials is one of the current research hotspots.Among them,the micro-nano motors are micro-nano devices with a size between 100 nm and 10 μm.As a rapidly developing interdisciplinary research field,micro-nano motors have received more and more extensive research and attention from domestic and foreign researchers.Because micro-nano motors can convert external energy into mechanical energy to complete autonomous driving,they have broad application prospects in the fields of biomedicine and environmental restoration.The chemical catalytic motor is one of the most common and promising devices used in micro-nano robots.However,these micro-nano devices face the problems of complicated and cumbersome preparation methods,high cost,difficult to accurately adjust the particle size,and difficulty in mass production.However,these micro-nano devices are facing problems such as complicated and cumbersome preparation methods,high cost,difficulty in precise adjustment of particle size,and difficulty in mass production.Therefore,there is an urgent need for a method for fabricating micro-nano devices which is simple to operate,easy to accurately adjust the size,and high-throughput production.In order to meet related application requirements,this subject proposes a micro-nano manufacturing method based on microfluidic technology.The precise control of the particle size of the micro-nano motor can be achieved,which has great application prospects.In this work,we have designed a chemically catalyzed micro/nano motor and explored the motion law under different conditions.By using the emulsion method based on the microfluidic platform,the process conditions and related parameters of the micron-scale monodisperse polystyrene particles were explored.Changing the size of the microchannel,the concentration of the immiscible two phases,and the air pressure have achieved precise control of the size of the microspheres in the range of1 μm～50 μm.The Janus structure micro-nano motor with a particle size of less than5 μm was fabricated by ion sputtering technology.The morphology and structure of the samples were characterized by fluorescence microscope,scanning electron microscope,fluorescence spectrometer and confocal microscope.We explored the relationship between the movement speed of a chemically driven motor in a hydrogen peroxide solution with changes in particle size and surface coating area.The movement speed decreases with the increase of the particle size,and does not change after reaching the maximum value with the increase of the surface coating area.On this basis,we summarized the movement of the chemically driven motor under the electric field.Under the action of an electric field,the chemical driving force is dominant,and the speed of the motor first becomes a linear relationship with the square of the voltage.When the orientation of the motor is stabilized,the speed reaches the maximum value and remains unchanged.At the same time,polyfluorenebased macromolecular fluorescent compound dyes were used to fluoresce the micronano motor,and the effect of dye concentration on the phase separation phenomenon in the confines of polystyrene microspheres was explored.We explored the reasons for the phase separation phenomenon and applied it to the fingerprint-like fluorescent labeling of micro-nano motors.Based on the preparation and research of micro-nano motors,this paper proposes a micro-nano manufacturing method based on microfluidic technology.Based on the precise adjustment of the particle size of the micro-nano motor,the law of motion of the chemically driven motor was systematically explored.In addition,through the fluorescence of the motor,we have initially explored the method of micro-nano motor’s fingerprint feature fluorescent labeling,which provides new a idea for the micro-nano motor’s fluorescence recognition and subsequent tracking of a single micro-nano motor. |
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