A microscale thermal field reconfigurable dynamic control method and thermal encoding device based on a magnetic micro-nano robot cluster

Abstract

The present invention relates to the field of thermal science, and in particular to a method for reconfigurable dynamic control of microscale thermal fields based on magnetic micro-nano robot clusters and a thermal encoding device. The method comprises the following steps: S1. Under the action of an ultrasonic field, the micro-nano robots are suspended and form a circular cluster; S2. An oscillating magnetic field is applied, causing the micro-nano robot cluster to transform from a circular shape into a gear shape; S3. Near-infrared light with a wavelength of 808 nm is used to illuminate the micro-nano robot cluster area, causing the micro-nano robot cluster to exhibit a thermal effect; and S4. The micro-nano robot cluster morphology is controlled by controlling the ultrasonic field and magnetic field characteristic parameters, thereby achieving reconfigurable dynamic control of the microscale thermal field within the cluster area. The thermal encoding device comprises a thermal imager, a near-infrared light source, a magnetic field generator, and an ultrasonic field generator. The present invention can achieve reconfigurable dynamic control of the microscale thermal field and can transmit information using 8-bit ASCII code through encoding and decoding processes.

Description

Technical Field

[0001] The present invention relates to the field of thermal science, and in particular to a microscale thermal field reconfigurable dynamic control method and a thermal encoding device based on a magnetic micro-nano robot cluster. Background Art

[0002] Microscale thermal field manipulation refers to the precise control of heat transfer and conversion processes at the microscale through structural and material design. It holds broad application prospects in fields such as thermal information storage, thermoelectric conversion, and thermal switching. The core of microscale thermal field manipulation is to control heat flow, thereby controlling the energy transfer and conversion process between the heat source and the device. However, most existing thermal field manipulation methods are based on solid-phase material design. Because solid-phase material-based thermal field manipulation devices have fixed structural compositions and system configurations, each device corresponds to a specific thermal field distribution, making dynamic control of the thermal field extremely difficult and limiting the device's functionality. In recent years, thermal field manipulation methods based on combinatorial unit cells have garnered widespread attention from researchers both domestically and internationally. However, the tunable functions of combinatorial unit cell-based thermal field manipulation devices still rely on the arrangement and combination of materials with different thermal conductivities. Consequently, they can only achieve discrete control of the thermal field and exhibit poor dynamic control performance. Compared to solid-phase materials, liquid-phase materials, due to their fluidity, offer greater flexibility and controllability in the dynamic configuration of the thermal field and the structural design of thermal field manipulation devices.

[0003] Micro-nano robots are solid-phase micro-nanostructures that can convert external energy, such as chemical energy, light energy, ultrasonic energy, thermal energy, and electromagnetic energy, into mechanical energy to achieve specific functions. They can transfer heat through heat conduction and radiation. A micro-nanorobotic cluster is a stable, ordered, and regularly arranged two-phase cluster structure formed in a liquid phase under the influence of an external physical field. Utilizing the dynamic behavior of a micro-nanorobotic cluster to precisely control local thermal conductivity offers a breakthrough and innovative approach to the reconfigurable dynamic control of microscale thermal fields. Therefore, combining the advantages of both solid-phase and liquid-phase materials, a reconfigurable dynamic control method for microscale thermal fields based on micro-nanorobotic clusters is proposed, enabling rapid switching control and reconfigurable dynamic configuration of microscale thermal field distributions. Furthermore, utilizing micro-nanorobotic clusters to control microscale thermal fields and developing thermal encoding devices based on these clusters can achieve efficient information transmission, with broad application prospects in the information and communications fields. Summary of the Invention

[0004] The purpose of the present invention is to provide a reconfigurable dynamic control method of a microscale thermal field based on a magnetic micro-nano robot cluster, which can realize reconfigurable dynamic control of the microscale thermal field; and further provide a reconfigurable thermal encoding device based on a magnetic micro-nano robot cluster, which can realize information transmission using 8-bit ASCII code through encoding and decoding processes.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for reconfigurable dynamic control of a microscale thermal field based on a magnetic micro-nano robot cluster comprises the following steps:

[0007] S1. Under the action of the ultrasonic field, the micro-nano robots levitate and form a circular cluster;

[0008] S2, applying an oscillating magnetic field, the micro-nano robot cluster changes from a circular shape to a gear shape;

[0009] S3, using near-infrared light with a wavelength of 808nm to irradiate the micro-nano robot cluster area, the micro-nano robot cluster body shows a thermal effect;

[0010] S4. Control the morphology of the micro-nano robot cluster by controlling the characteristic parameters of the ultrasonic field and magnetic field, adjust the microscale thermal field distribution characteristics in the cluster area, and make the microscale thermal field distribution quickly switch between circular and gear shapes, thereby realizing reconfigurable dynamic control of the microscale thermal field in the cluster area.

[0011] Furthermore, the ultrasonic field in step S1 is generated by passing a 3 MHz, 10 V sinusoidal wave signal amplified twice by a power amplifier into the ultrasonic transducer.

[0012] Furthermore, the oscillating magnetic field in step S2 is a uniform oscillating magnetic field perpendicular to the plane of the micro-nano robot cluster, which is generated by passing a 10 Hz, 4 V sinusoidal wave signal amplified 4 times by a power amplifier into the Helmholtz coil.

[0013] Furthermore, by adjusting the amplitude and frequency of the applied ultrasonic field, the morphology of the micro-nano robot cluster will quickly switch between gear-shaped and circular states.

[0014] Furthermore, when the amplitude of the ultrasonic field increases, the shape of the micro-nano robot cluster changes from a gear shape to a circle; when the frequency of the ultrasonic field is adjusted from 3MHz to 2.8MHz, the shape of the micro-nano robot cluster changes from a circle to a gear shape.

[0015] Furthermore, the magnetic micro-nano robot is obtained by immersing the micro-nano robot in a gold nanoparticle solution with a diameter of 40 nanometers for 30 minutes for surface modification. The magnetic micro-nano robot is a spherical structure with a thin layer of silicon dioxide coated on the surface of ferric oxide.

[0016] A microscale thermal field reconfigurable thermal encoding device based on a magnetic micro-nano robot cluster includes a thermal imager for collecting thermal field distribution information of the micro-nano robot cluster, a near-infrared light source for irradiating near-infrared light with a wavelength of 808nm, a magnetic field generating device for applying a uniform oscillating magnetic field, and an ultrasonic field generating device for generating an ultrasonic field.

[0017] Furthermore, the magnetic field generating device includes a Helmholtz coil, which uses a signal generator to generate a 10Hz, 4V sinusoidal wave signal. After the signal is amplified 4 times by a power amplifier, it is input into the Helmholtz coil as a signal source, which can generate a uniform magnetic field oscillating in a single direction in space.

[0018] Furthermore, the ultrasonic field generating device includes an ultrasonic transducer, which uses a signal generator to generate a 3MHz, 10V sinusoidal wave signal, which is amplified twice by a power amplifier and then input into two ultrasonic transducers as a signal source to generate an ultrasonic field.

[0019] Furthermore, the ultrasonic field generating device also includes a silicon wafer, a polyimide patch and borosilicate glass. The ultrasonic transducer is pasted on the back side of the silicon wafer, and the generated ultrasonic field is transmitted through the silicon wafer to reduce the loss during the ultrasonic transmission process; a rectangular polyimide patch with a thickness of 250 μm is pasted on the surface of the silicon wafer, and eight cylindrical holes with a diameter of 3 mm are provided on the polyimide patch to serve as the clustering area of ​​the two-phase micro-nano robot cluster; borosilicate glass is placed on the top of the polyimide patch to reflect sound waves and construct an ultrasonic standing wave field in the cluster area.

[0020] Beneficial effects of the present invention:

[0021] A reconfigurable dynamic control method for microscale thermal fields based on a micro-nano robot cluster is proposed. By controlling the characteristic parameters of the external ultrasonic field and magnetic field, reconfigurable dynamic control of the microscale thermal fields in eight regions can be achieved. A reconfigurable thermal coding device based on a magnetic micro-nano robot cluster is proposed, which realizes 8-bit thermal coding function and can use 8-bit ASCII code to transmit information. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Scanning electron microscope images of gold nanoparticles and gold nanoparticle-modified magnetic micro-nanorobots;

[0023] Figure 2 Schematic diagram and microscopic image of the morphology control of micro-nano robot clusters based on acoustic and magnetic fields;

[0024] Figure 3 Thermal field images and coding rules for micro-nano robot clusters with different morphologies;

[0025] Figure 4 This is a front view of a reconfigurable thermal encoding device based on a magnetic micro-nano robot cluster;

[0026] Figure 5 A top view of a reconfigurable thermal encoding device based on a magnetic micro-nano robot cluster.

[0027] Figure 6 The encoding and decoding process of the reconfigurable thermal coding device based on the magnetic micro-nano robot cluster.

[0028] In the picture:

[0029] 1-thermal imager; 2-near-infrared light source; 3-Helmholtz coil; 4-boron silica glass; 5-silicon wafer; 6-ultrasonic transducer; 7-polyimide patch; 8-wire. DETAILED DESCRIPTION

[0030] A microscale thermal field reconfigurable dynamic control method based on a magnetic micro-nano robot cluster is described in detail:

[0031] The microscale thermal field reconfigurable dynamic control method for magnetic micro-nanorobotic clusters involves the following steps: First, a 3MHz, 10V sinusoidal signal, amplified twice by a power amplifier, is applied to the ultrasonic transducer. Under the influence of the ultrasonic field, the micro-nanorobotic clusters levitate within the cluster area due to the acoustic radiation force, forming a circular cluster. Second, a 10Hz, 4V sinusoidal signal, amplified four times by a power amplifier, is applied to the Helmholtz coils. Under the influence of a uniform oscillating magnetic field perpendicular to the plane of the micro-nanorobotic cluster, the micro-nanorobotic clusters, composed of paramagnetic iron oxide, respond to the external magnetic field and contract, exhibiting a gear-shaped cluster state. Subsequently, by adjusting the amplitude and frequency of the applied ultrasonic field, the micro-nanorobotic cluster rapidly switches between the gear-shaped and circular states. As the ultrasonic field amplitude increases, the micro-nanorobotic cluster changes from a gear-shaped to a circular state. When the frequency of the ultrasonic field is adjusted from 3MHz to 2.8MHz, the shape of the micro-nano robot cluster changes from a circle to a gear shape; the schematic diagram and microscopic image of the transformation of the micro-nano robot cluster are shown in the figure. Figure 2As shown. Finally, the magnetic micro-nano robot cluster is irradiated with near-infrared light with a wavelength of 808nm. Since the surface of the magnetic micro-nano robot is modified with gold nanoparticles, the micro-nano robot cluster will show a significant thermal effect due to surface plasmon resonance under the irradiation of near-infrared light. The thermal field distribution information of the micro-nano robot cluster under the irradiation of near-infrared light can be collected and characterized using a thermal imager. By controlling the amplitude and frequency of the external ultrasonic field, the morphology of the micro-nano robot cluster can be controlled, and the microscale thermal field distribution characteristics of the cluster area can be further adjusted. The microscale thermal field distribution will quickly switch between circular and gear shapes, which can realize reconfigurable dynamic regulation of the microscale thermal field in the cluster area, as shown in Figure 3 shown.

[0032] Based on this, coding rules can be formulated according to the thermal field distribution characteristics. It is stipulated that the cluster area with circular thermal field distribution characteristics is "0", and the cluster area with gear-shaped thermal field distribution characteristics is "1", such as Figure 3 Therefore, it is possible to link the thermal field distribution characteristics with informatics, and by controlling the external ultrasonic field, it is possible to control and transmit the microscale thermal field information, and ultimately realize the thermal coding function.

[0033] Further:

[0034] The magnetic micro-nano robot is made of ferric oxide and coated with a thin layer of silicon dioxide to form a spherical structure with a diameter of 7 microns. Micro-nano robots are commercially available. The micro-nano robot is placed in a solution of gold nanoparticles with a diameter of 40 nanometers and immersed for 30 minutes for surface modification. Figure 1 shown.

[0035] The specific process flow for preparing the gold nanoparticle solution is as follows: add 50 mL of 0.3 mmol / L chloroauric acid solution into a beaker, heat to 95°C, slowly add 0.5 mL of 39 mmol / L sodium citrate solution into the chloroauric acid solution, heat to near boiling, and stir with a magnetic stirrer for 3 minutes to obtain the gold nanoparticle solution.

[0036] Furthermore, the microscale thermal field reconfigurable thermal encoding device based on the magnetic micro-nano robot cluster is described in detail:

[0037] A reconfigurable thermal encoding device based on a magnetic micro-nano robot cluster mainly consists of four parts: a thermal imager 1, a near-infrared light source with a wavelength of 808nm 2, a magnetic field generator, and an ultrasonic field generator. Figure 4 As shown, the top view is Figure 5As shown in the figure, the magnetic field generator uses a Helmholtz coil 3. A signal generator generates a 10Hz, 4V sinusoidal signal. After being amplified 4 times by a power amplifier, the signal is input into the Helmholtz coil 3 as a signal source, generating a uniform magnetic field oscillating in a single direction in space. The ultrasonic field generator consists of an ultrasonic transducer 6, a silicon wafer 5, a polyimide patch 7, and borosilicate glass 4. A signal generator generates a 3MHz, 10V sinusoidal signal. After being amplified 2 times by a power amplifier, the signal is input into two ultrasonic transducers 6 as a signal source to generate an ultrasonic field. The ultrasonic transducers 6 are attached to the back side of the silicon wafer 5. The generated ultrasonic field propagates through the silicon wafer 5 to reduce losses during ultrasonic transmission. A 250μm thick rectangular polyimide patch 7 is attached to the surface of the silicon wafer 5. The polyimide patch 7 has eight cylindrical holes with a diameter of 3mm, which serve as the clustering area of ​​the two-phase micro-nano robot cluster. Borosilicate glass 4 is placed on top of the polyimide patch 7 to reflect sound waves and create an ultrasonic standing wave field within the cluster area. Two near-infrared light sources 2 are used to illuminate the four micro-nano robot cluster areas. Due to surface plasmon resonance, the micro-nano robot cluster will exhibit a significant thermal effect. A thermal imager 1 is used to collect thermal field distribution information of the micro-nano robot cluster.

[0038] When the amplitude and frequency of the externally applied ultrasonic field are adjusted, the morphology of the micro-nano robot cluster in the eight micro-nano robot cluster areas can be controlled, and further, the reconfigurable dynamic control of the micro-scale thermal field distribution characteristics can be realized, and finally the thermal coding function can be realized. According to the established coding rules, the coding sequence to be transmitted is input into the reconfigurable thermal coding device, and the thermal field distribution characteristics of the eight corresponding areas can be determined by the coding sequence. The amplitude and frequency of the ultrasonic field are further adjusted according to the thermal field distribution characteristics to control the morphology of the micro-nano robot cluster, and the encoding process can be realized. On the contrary, when the morphology of the micro-nano robot cluster in the eight areas is known, the thermal imager 1 is used to observe and characterize it, and the thermal field distribution characteristics of the micro-nano robot cluster in the eight areas are obtained. According to the established coding rules, the 8-bit information sequence can be determined, and finally the decoding process is realized. Therefore, by repeating the above encoding and decoding processes, the proposed reconfigurable thermal coding device can realize information transmission using 8-bit ASCII code. The simulation calculation and experimental results are shown in FIG. Figure 6 shown.

[0039] The basic principles of the present invention are:

[0040] The magnetic micro-nano robot is primarily composed of a paramagnetic iron oxide material and is capable of responding to an external input magnetic field. A silicon dioxide layer is coated on the surface of the iron oxide, forming a spherical structure to improve the robot's mobility and reduce adhesion. The silicon dioxide-coated iron oxide micro-nano robot is commercially available. The surface of the micro-nano robot is functionalized using gold nanoparticles. Based on the surface plasmon effect, the micro-nano robot exhibits a significant thermal effect when irradiated with near-infrared light.

[0041] The method for reconfigurable dynamic control of microscale thermal fields based on magnetic micro-nanorobot clusters is implemented under the coupling of ultrasonic, magnetic, and optical fields. First, under the action of an ultrasonic standing wave field, the micro-nanorobots are subjected to acoustic radiation forces, levitating within the cluster area and forming a circular cluster. Second, an oscillating uniform magnetic field is further applied, causing the micro-nanorobot cluster to transform from a circular shape into a gear shape under the action of the magnetic field. Third, a near-infrared light source is used to illuminate the micro-nanorobot cluster area. Due to the surface plasmon resonance effect, the micro-nanorobot cluster exhibits a significant thermal effect. By controlling the characteristic parameters of the applied ultrasonic and magnetic fields, the morphology of the micro-nanorobot cluster in the cluster area can be controlled, and further, the reconfigurable dynamic control of the microscale thermal field in the cluster area can be achieved.

[0042] The reconfigurable thermal encoding device based on a magnetic micro-nanorobotic cluster primarily consists of four components: a thermal imager, a near-infrared light source, a magnetic field generator, and an ultrasonic field generator. The magnetic field generator utilizes a Helmholtz coil. A signal generator generates a sinusoidal signal, which is amplified by a power amplifier and then fed into the Helmholtz coil as a signal source. This generates a uniform magnetic field oscillating in a single direction. The ultrasonic field generator comprises an ultrasonic transducer, a silicon wafer, a polyimide patch, and borosilicate glass. The signal generator generates a sinusoidal signal, which is amplified by a power amplifier and then fed into the ultrasonic transducer as a signal source to generate an ultrasonic field. The ultrasonic transducer is attached to the backside of the silicon wafer, and the generated ultrasonic field propagates through the wafer to reduce losses during ultrasonic transmission. A polyimide patch is attached to the surface of the silicon wafer, serving as the clustering area for the two-phase micro-nanorobotic cluster. Borosilicate glass is placed on top of the polyimide patch to reflect sound waves and create an ultrasonic standing wave field within the cluster area. A near-infrared light source illuminates the micro-nanorobotic cluster area, serving as heat input for the thermal encoding device. A thermal imager is used to characterize and observe the thermal field distribution. By controlling the characteristic parameters of the ultrasonic and magnetic fields, the micro-nanorobotic cluster's morphology can be dynamically and reconfigurably controlled. This allows for the manipulation of microscale thermal field distribution and the realization of thermal encoding capabilities.

Claims

1. A method for reconfigurable dynamic control of microscale thermal fields based on a cluster of magnetic micro-nano robots. The magnetic micro-nano robots are surface-modified by immersing them in a solution of 40-nanometer-diameter gold nanoparticles for 30 minutes. The magnetic micro-nano robots are spherical structures with a thin layer of silicon dioxide coated on the surface of ferric oxide. The method is characterized by: The method comprises the following steps: S1. Under the action of the ultrasonic field, the magnetic micro-nano robots levitate and form a circular cluster; S2. Apply an oscillating magnetic field, and the magnetic micro-nano robot cluster changes from a circular shape to a gear shape. Adjust the amplitude and frequency of the applied ultrasonic field, and the magnetic micro-nano robot cluster will quickly switch between the gear shape and the circular shape. When the ultrasonic field amplitude increases, the magnetic micro-nano robot cluster changes from a gear shape to a circular shape. When the ultrasonic field frequency is adjusted from 3 MHz to 2.8 MHz, the magnetic micro-nano robot cluster changes from a circular shape to a gear shape. S3, using near-infrared light with a wavelength of 808nm to irradiate the magnetic micro-nano robot cluster area, the magnetic micro-nano robot cluster body shows a thermal effect; S4. Control the morphology of the magnetic micro-nano robot cluster by controlling the characteristic parameters of the ultrasonic field and magnetic field, adjust the microscale thermal field distribution characteristics in the cluster area, and make the microscale thermal field distribution quickly switch between circular and gear shapes, thereby realizing reconfigurable dynamic control of the microscale thermal field in the cluster area.

2. The method according to claim 1, wherein: In step S1 , the ultrasonic field is generated by passing a 3 MHz, 10 V sine wave signal amplified twice by a power amplifier into the ultrasonic transducer.

3. The method according to claim 2, wherein: The oscillating magnetic field in step S2 is a uniform oscillating magnetic field perpendicular to the plane of the magnetic micro-nano robot cluster, generated by passing a 10 Hz, 4 V sinusoidal wave signal amplified 4 times by a power amplifier into the Helmholtz coil.

4. A microscale thermal field reconfigurable thermal encoding device based on a magnetic micro-nano robot cluster, used to implement the method described in any one of claims 1 to 3, characterized in that: The invention comprises a thermal imager (1) for collecting thermal field distribution information of a magnetic micro-nano robot cluster, a near-infrared light source (2) for irradiating near-infrared light with a wavelength of 808 nm, a magnetic field generating device for applying a uniform oscillating magnetic field, and an ultrasonic field generating device for generating an ultrasonic field.

5. The thermal encoding device according to claim 4, characterized in that: The magnetic field generating device comprises a Helmholtz coil (3), which generates a 10 Hz, 4V sinusoidal wave signal using a signal generator. After the signal is amplified 4 times by a power amplifier, it is input into the Helmholtz coil (3) as a signal source, thereby generating a uniform oscillating magnetic field oscillating in a single direction in space.

6. The thermal encoding device according to claim 5, characterized in that: The ultrasonic field generating device includes an ultrasonic transducer (6), which generates a 3 MHz, 10V sine wave signal using a signal generator. After the signal is amplified by a power amplifier by 2 times, the signal is input into two ultrasonic transducers (6) as a signal source to generate an ultrasonic field.

7. The thermal encoding device according to claim 6, characterized in that: The ultrasonic field generating device further comprises a silicon wafer (5), a polyimide patch (7) and borosilicate glass (4); an ultrasonic transducer (6) is pasted on the back side of the silicon wafer (5), and the generated ultrasonic field is propagated through the silicon wafer (5); a rectangular polyimide patch (7) with a thickness of 250 μm is pasted on the surface of the silicon wafer (5), and eight cylindrical holes with a diameter of 3 mm are provided on the polyimide patch (7) as a clustering area of ​​a two-phase magnetic micro-nano robot cluster; borosilicate glass (4) is placed on top of the polyimide patch (7) to reflect sound waves and construct an ultrasonic standing wave field in the clustering area.

Images