Torsional deformation actuator based on graphene film

Abstract

According to the torsional deformation actuator based on the graphene film, mechanical gradients (including curvature gradients and density gradients) generated in the torsional deformation process of the graphene film are used as driving force to drive a nanometer sliding sheet arranged on the surface of the film to conduct radial migration, the annular graphene film is adopted, the inner diameter of the annular graphene film ranges from 5 nanometers to 500 nanometers, and the thickness of the annular graphene film ranges from 5 nanometers to 500 nanometers. The outer diameter is 20-1000 nanometers, the inner boundary is fixed, the outer boundary is used for applying torque to generate spiral wrinkles, and the movement speed of the solid slip sheet can be accurately controlled by adjusting parameters such as the magnitude of the torque, the applying direction and the duration time. The method does not need external physical field intervention, reduces the damage to the structure, has the remarkable advantages of high-efficiency conversion, high system stability, flexible parameter adjustment, accurate motion control and the like, is suitable for nanoscale self-cleaning, cluster driving and other applications, and provides a new solution for the development of the nanotechnology.

Description

Technical Field

[0001] The present invention relates to the technical field of nano actuators, and in particular to a torsional deformation actuator based on a graphene film. Background Art

[0002] Torsionally driven mechanical devices, such as torsion springs in mechanical watches and twisted filaments in artificial muscles, play a key role in macroscopic systems because they can efficiently convert stored elastic energy into mechanical motion and are widely used in robotics, precision instruments and other fields. However, when trying to shrink these advanced torsionally driven mechanisms to the nanoscale, researchers have encountered a series of unprecedented challenges.

[0003] At the nanoscale, the mechanical properties of materials show completely different characteristics from those at the macroscale, which poses a severe challenge to the effective storage and release of torsional energy. Specifically, the elastic modulus, yield strength and other key mechanical performance parameters of nanomaterials are different, making the torsional drive mechanism more complex and difficult to predict at the nanoscale.

[0004] In addition, although driving technologies based on external physical fields (e.g., electric fields, temperature gradients, thermal fluctuations, etc.) have made great progress in recent years, these methods still have many limitations in practical applications. In particular, external physical fields may cause irreversible damage to the fine structure of nanodevices, thus limiting the widespread application of these technologies in nanomechanical devices.

[0005] Therefore, developing a mechanical device based on torsional deformation and suitable for nanoscale requires not only a deep understanding of the mechanical properties of nanomaterials and their interaction with the torsional drive mechanism, but also the need to overcome the potential risks brought about by external physical field driving technology. How to solve these problems and achieve efficient, stable and reliable operation of nanomechanical devices based on torsional deformation is a technical problem that needs to be overcome urgently. Summary of the invention

[0006] In order to overcome the above technical problems, the present invention proposes a torsional deformation actuator based on graphene film, which utilizes the mechanical gradient generated by the graphene film during the torsional deformation process to drive the radial migration of nano-slides on the surface of the film. The movement speed of the nano-slide can be controlled by adjusting the torsion angle, torsion rate, and torsion radius to achieve contactless driving of the nano-slide, thereby avoiding potential damage to the nanostructure caused by external physical fields and improving the stability and reliability of the system.

[0007] The present invention is achieved through the following technical solutions:

[0008] A torsional deformation actuator based on a graphene film is characterized by comprising:

[0009] An annular graphene film, whose inner diameter is between 5 and 500 nanometers and outer diameter is between 20 and 1000 nanometers, wherein the inner boundary of the graphene film is fixed and the outer boundary is used to apply torque to generate spiral wrinkles;

[0010] At least one nano-slider, disposed on the surface of the graphene film, for radially migrating in response to the torsional deformation of the graphene film;

[0011] The movement speed of the nano-slide is controlled by adjusting at least one of the magnitude, application direction and duration of the torque.

[0012] Furthermore, the twist angle of the graphene film is between 4 and 10 degrees.

[0013] Furthermore, a driving method is also included, the method comprising the following steps:

[0014] S1. fixing the inner boundary of the graphene film;

[0015] S2. applying a torque to the outer boundary of the graphene film to cause a spiral wrinkle deformation in the central region of the graphene film;

[0016] S3. Using the curvature gradient and / or density gradient generated by the wrinkle deformation and distributed from the inner boundary to the outer boundary, drive the nano-sliding sheet to migrate toward the outer boundary in a directional manner.

[0017] Furthermore, the curvature gradient causes the elastic energy of the nano-slide adsorbed on the surface of the graphene film to have a gradient distribution from the inner boundary to the outer boundary, thereby driving it to move toward the outer boundary with lower elastic energy.

[0018] Furthermore, after the graphene film is twisted, the atoms near the inner boundary are subjected to greater tangential strain, causing the nano-slider to contact fewer substrate atoms in this area, resulting in higher van der Waals potential energy, and moving toward the outer boundary with more contact atoms and lower van der Waals potential energy.

[0019] Furthermore, the graphene film can be replaced by other two-dimensional film materials such as boron nitride and molybdenum disulfide.

[0020] Furthermore, the number, shape, size and / or material of the nano-slides can be selected and designed according to specific application requirements.

[0021] The actuator can be used for nanoscale self-cleaning or cluster driving applications.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention utilizes the torsional deformation of graphene as a driving source, does not require external physical field intervention, improves energy conversion efficiency, and is applicable to nano-objects of various materials.

[0024] 2. The device can reach a driving speed of 120m / s, which exceeds most existing nano-drive devices. It not only provides a new solution for the driving and control of nano-scale devices, but also promotes the application and development of nanotechnology in the fields of self-cleaning and cluster driving.

[0025] 3. The nano-slide can control its movement speed by adjusting the torsion angle, torsion rate, and torsion radius, avoiding the potential damage of the external physical field to the nanostructure and improving the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a torsional deformation actuator based on a graphene film according to the present invention;

[0027] Figure 2 This is the energy distribution diagram of the nano-slide on the graphene film;

[0028] Figure 3 This is the driving effect diagram of the torsional actuator.

[0029] In the figure: 1. annular graphene film; 2. outer boundary of graphene film; 3. inner boundary of graphene film; 4. driven nano-slider. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments, but this should not limit the protection scope of the present invention.

[0031] This embodiment provides a torsional deformation actuator based on a graphene film, which uses the mechanical gradient generated by the torsional deformation of the graphene film to drive the movement of surface solid particles.

[0032] See also Figure 1 , Figure 1 The present invention is a schematic diagram of a torsional deformation actuator based on a graphene film, as shown in the figure, comprising an annular graphene film, the inner boundary of which is fixed, and the outer boundary is used to apply torque to generate spiral wrinkles. When a torsional load is applied to it, solid particles adsorbed on its surface can be driven toward the outer boundary.

[0033] In this embodiment, the inner diameter of the graphene film is between 5 and 500 nanometers, and the outer diameter is between 20 and 1000 nanometers, so that the graphene ring has good mechanical properties and stability at the nanoscale. The torque applied by the outer boundary of the graphene film causes the torsion angle to be between 4 and 10 degrees. The torsion angle within this range can generate enough mechanical gradients to drive the movement of solid particles while avoiding excessive damage to the graphene film structure.

[0034] The inner boundary is used to fix the graphene ring and prevent it from moving in all directions, while the outer boundary is used to apply torque. However, the inner and outer boundaries can also be interchanged, that is, the inner boundary is twisted and the outer boundary is fixed, which provides more flexibility.

[0035] Driving source: The wrinkle deformation of graphene can be regarded as the driving source. Each wrinkle is composed of two mechanical gradients, namely the curvature gradient and the contact atom number gradient (such as Figure 2 ).

[0036] Mechanical gradient of wrinkle deformation: When the graphene ring is subjected to torsion load, spiral wrinkle deformation will occur in its central area. These wrinkles not only form a curvature gradient from the inner boundary to the outer boundary, but also lead to a change in the gradient of the number of contact atoms. These two mechanical gradients together constitute the force source that drives the movement of solid particles.

[0037] Curvature gradient: The curvature of the wrinkles gradually decreases from the inner boundary to the outer boundary. This curvature gradient causes the elastic energy of solid particles (such as nano-slides) adsorbed on the graphene surface to also produce a corresponding gradient distribution. Particles with higher elastic energy will move to the area with lower elastic energy (i.e., the outer boundary).

[0038] Gradient of contact atom number: After graphene is twisted, the atoms near the inner boundary are subjected to greater tangential strain, resulting in fewer substrate atoms in contact with the nano-slider in this area. This reduction in the number of contact atoms increases the van der Waals potential energy of the nano-slider, so it moves toward the outer boundary with more contact atoms and lower van der Waals potential energy.

[0039] The specific driving process steps of the present invention are as follows:

[0040] S1. The inner boundary of the graphene nanoring is fixed, and torque is applied to the outer boundary, so that the central area of ​​the graphene ring produces a spiral wrinkle deformation;

[0041] S2. The wrinkle deformation of graphene has a curvature gradient and density gradient distributed from the inner boundary to the outer boundary, which can provide a driving force for the solid particles adsorbed on the graphene surface, causing them to migrate toward the outer boundary.

[0042] By adjusting parameters such as the torque size, application direction, and duration, the movement speed and direction of the solid particles can be precisely controlled.

[0043] The working principle of the present invention is as follows: when the graphene surface is torsionally wrinkled, the curvature of each wrinkle decreases from the inner boundary to the outer boundary (e.g. Figure 2 (a) shows the hollow point), so that the elastic energy of the nano-slide adsorbed on its surface produces a gradient from the inner boundary to the outer boundary as shown in Figure 2 (shown as the solid dots in (a)), driving it to move toward the outer boundary with lower elastic energy; after the graphene is twisted, the atoms near the inner boundary are subjected to greater tangential strain, causing the nano-slide to contact fewer substrate atoms in this area (as shown in Figure 2 (b) as the hollow point), resulting in a higher van der Waals potential energy, so it will move toward the outer boundary with more contact atoms and higher van der Waals potential energy (such as Figure 2 (b) The device drives the slider to move toward the outer boundary through the curvature gradient of the wrinkles and the gradient of the number of contact atoms, as shown in Figure 3 As shown, it is suitable for nanoscale self-cleaning and cluster-driving applications.

[0044] In addition to graphene, the present invention can also consider using other two-dimensional thin film materials such as boron nitride and molybdenum disulfide as substrates. These materials have similar mechanical properties and chemical stability to graphene, but may have different electrical, optical or thermal properties, thereby expanding the scope of application. In order to further improve the performance and reliability of the actuator, it is possible to consider multi-scale design and integration of multiple graphene rings. For example, multiple graphene rings of different sizes can be combined to form a complex nanostructure or array to achieve more complex drive and control functions. Combined with advanced sensing technology and intelligent control algorithms, real-time monitoring and precise control of the motion state of the actuator can be achieved. This intelligent control and feedback mechanism will help improve the stability and response speed of the actuator and provide it with stronger competitiveness in a wider range of application scenarios.

[0045] The present invention can be used as a component for self-cleaning or cluster driving of nano-surfaces, and provides a new solution for driving and controlling nano-scale devices. For example, in terms of nano-scale self-cleaning, an actuator can be used to drive solid particles to migrate in a directional manner on a nano-surface, thereby achieving effective removal of pollutants. In terms of cluster driving, precise manipulation and assembly of nanostructures can be achieved by precisely controlling the motion states and interaction relationships of multiple actuators. It can be used for micro-nano operations in the biomedical field, such as cell manipulation, drug delivery, etc. By precisely controlling the motion of the actuator, precise positioning and delivery of cells or drugs can be achieved. It can be used for micro-actuators or micro-sensors in micro-electromechanical systems. By being integrated into MEMS devices, high-precision displacement control or sensing functions can be achieved.

[0046] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A torsional deformation actuator based on graphene film, characterized in that: include: An annular graphene film, whose inner diameter is between 5 and 500 nanometers and outer diameter is between 20 and 1000 nanometers, wherein the inner boundary of the graphene film is fixed and the outer boundary is used to apply torque to generate spiral wrinkles; At least one nano-slider, disposed on the surface of the graphene film, for radially migrating in response to the torsional deformation of the graphene film; The movement speed of the nano-slide is controlled by adjusting at least one of the magnitude, application direction and duration of the torque.

2. The graphene film-based torsional deformation actuator according to claim 1, characterized in that: The twist angle of the graphene film is between 4 and 10 degrees.

3. The torsional deformation actuator based on graphene film according to claim 1 or 2, characterized in that: Also included is a driving method, the method comprising the following steps: S1. fixing the inner boundary of the graphene film; S2. applying a torque to the outer boundary of the graphene film to cause a spiral wrinkle deformation in the central region of the graphene film; S3. Using the curvature gradient and / or density gradient generated by the wrinkle deformation and distributed from the inner boundary to the outer boundary, drive the nano-sliding sheet to migrate toward the outer boundary in a directional manner.

4. The graphene film-based torsional deformation actuator according to claim 3, characterized in that: The curvature gradient causes the elastic energy of the nano-slide adsorbed on the surface of the graphene film to be gradiently distributed from the inner boundary to the outer boundary, thereby driving it to move toward the outer boundary with lower elastic energy.

5. The graphene film-based torsional deformation actuator according to claim 3 or 4, characterized in that: After the graphene film is twisted, the atoms near the inner boundary are subjected to greater tangential strain, causing the nano-slider to contact fewer substrate atoms in this area, resulting in higher van der Waals potential energy, and moving toward the outer boundary with more contact atoms and lower van der Waals potential energy.

6. The torsional deformation actuator based on graphene film according to any one of claims 1 to 5, characterized in that: The graphene film can be replaced by other two-dimensional film materials such as boron nitride and molybdenum disulfide.

7. The graphene film-based torsional deformation actuator according to any one of claims 1 to 5, characterized in that: The number, shape, size and / or material of the nano-slides can be selected and designed according to specific application requirements.

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