Design And Simulation Of Ultra-High Speed Rotating Nanomotor In Solution

Nanomotors are indispensable power components in the nano-electromechanical system(NEMS)and are used in various fields.Although nanomotors have been continuously researched in recent years,most of them are researching the movement modes,driving methods,or assembly methods of nanomotors in a non-solution environment.There are very few researches on nanomotors that can be rotated at high speed and easily assembled in a solution environment.This paper is based on the principle that the carbon nanotubes suspended in the aqueous solution can be rotated by the orientation of the dipole moment of the water molecules under the induction of the rotating electric field.The nanomotor system and the nanogear transmission system which can work in the solution are constructed.In this thesis,the molecular dynamics(MD)method is used to study the rotation characteristics(rotation angle,rotation speed,cycle,etc)of the nanomotor system under the rotating electric field,mainly from the radius,length,structure angle or shape of the motor rotor.The specific work is as follows:(1)The I-type nanomotor systems with a length of 7 nm and a chirality of(8,8),(10,10),(12,12),(14,14)and(16,16)are studied.The results show that when the rotational speed of the rotating electric field is appropriate,by increasing the radius of the nanomotor rotor,on the one hand,the nanomotor rotor can be kept in step with the rotating electric field in a short time,and on the other hand,the degree of orientation ensures that the motor rotor is driven by the water molecule dipole moment in a short time.(2)The I-type nanomotor systems with different lengths of 4 nm,7 nm,10 nm,13 nm and 15 nm are studied.The results show that increasing the length of the motor rotor can reduce the lag angle of the motor rotor at an appropriate electric field speed,so that the speed of the nanomotor is consistent with the dipole moment orientation of the water molecules in a short time.However,an excessively long nanomotor rotor increases the frictional wear between the nanomotor rotor and the aqueous solution.What's more,the moment of inertia of the motor rotor itself also increases.(3)The I-type nanomotor systems with 90?,100?,120?,130? and 150? are constructed.The results show that changing the angle of the Y-type structure allows the nanomotor rotor to follow the step of the water molecule dipole as quickly as possible during the rotation process,so that the nanomotor rotor can be consistent with the rotation angle of the rotating electric field in a short time.(4)Nanomotor rotors with different shape structures("I","T","Y" and "+")are constructed.Comparing the rotation characteristics of four different types of nanomotor rotors,it can be found that the rotation performance of the I-type nanomotor rotor is better.The nanomotor rotors of both T and Y shapes have good rotational performance relative to the + rotor.These two shapes of nanomotor rotors have important reference value for the research of complex structure nano-rotary equipment.(5)Based on the nanomotor system established in(1)-(4),the corresponding nanogear transmission system is constructed respectively,and the change of the rotation performance of the established nanogear system is analyzed.