Research Of Fabrication And Electric/Magnetic Field Locomotion Liquid Metal Micromotors

As a new product developed by the theory of micro-nano technology,micro-nano motor is a kind of power machine which can convert the energy in the external environment,such as chemical energy,light energy,electric energy and other forms of energy,into its own mechanical energy and its size is between micro and nano.As an important carrier for studying the micro world,micro-nano motors have unique advantages and great potential in foreign body capture,intelligent manufacturing,targeted drug transportation and pipeline maintenance due to their small size.In this study,gallium-based liquid metal with both "liquid" and "metal" properties was used to prepare a gallium-based liquid metal micro-motor.The motor was driven by magnetic field and electric field to realize two-dimensional/three-dimensional motion,and the motion form and driving mechanism of the micro-motor were analyzed.The full text is divided into five chapters.In the first chapter,the background and significance of Ga-based liquid metal micro-motors are introduced,the research status of micro-motors and liquid metal are introduced respectively,and the main research content and innovation significance of this thesis are expounded.The second chapter mainly introduces all the instruments,equipment and reagents used in this project.In chapter 3,we fabricated a morphologically remotable liquid metal micron motor based on the "ice assisted transfer printing" technique.Under the control of elliptical polarized magnetic field,the transformation of different autonomous motion modes(rotation,wandering,turning)was studied by adjusting and controlling different field parameters(intensity,frequency,direction,etc.).In addition,the morphology remodeling of the motor under the irradiation of alternating magnetic field is studied.In chapter 4,a simple and reliable method for 3D manipulation of gallium-based liquid metal micromotor by programmable microelectrode array in non-liquid environment is presented.This method can guide their motion with high precision and convenience.The concern among adhesion force,gravity force and electric field force in the process of 3D motion is deeply analyzed.The fifth chapter mainly makes a comprehensive summary of the whole work,and gives the content that needs to be further studied in order to continue the research in the following.The innovation of this paper is mainly in two aspects.First,in the third chapter,in the preparation process of the liquid metal micromotor which can be reshaped,we innovatively proposed the technology of "ice-assisted transfer printing".This technique allows the motor to remain structurally unchanged and to stay on the target substrate or float on the surface of the solution without damaging the structure.Secondly,in the fourth chapter,we innovatively propose a method to greatly reduce the adhesion between the liquid metal micro-motor and the solid surface by cutting the thickness of the liquid metal oxide scale.This method makes it easy for small electric field forces to move particles across a solid surface.The two innovations in this thesis make the functional micro/nanomotors based on gallium-based liquid metal materials have great application potential in fields including chemical sensing,cargo transportation,materials science and even artificial intelligence.