A binary synergistic light / magnetic dual-responsive lce actuator, control method and application thereof

Abstract

The application discloses a binary cooperative light / magnetic dual-response LCE actuator, a control method and application thereof, and belongs to the technical field of electromagnetic functional materials, and comprises a liquid crystal elastomer film and a neodymium-iron-boron mixed polydimethylsiloxane film; the liquid crystal elastomer film and the neodymium-iron-boron mixed polydimethylsiloxane film are combined through the adhesion of polydimethylsiloxane itself; the neodymium-iron-boron mixed polydimethylsiloxane film has opposite magnetism at two ends; when an external magnetic field is applied, the neodymium-iron-boron mixed polydimethylsiloxane film serves as a driving layer and drives the liquid crystal elastomer film to move; the application utilizes light field and magnetic field coupling control technology, realizes that the binary cooperative light / magnetic dual-response LCE actuator can work in a light-free, constant-temperature and constant-humidity environment; in a pipeline environment and the like, light intensity, temperature and humidity and the like are difficult to serve as a stimulation source, the application introduces magnetic field control, can accurately control the curvature change of the actuator, and utilizes the bending form of the actuator to grasp light and small objects; and can be applied to mine exploration, field sampling and ear-nose-throat foreign matter treatment and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic functional materials, and specifically relates to a binary synergistic optical / magnetic dual-response LCE actuator, a control method and applications thereof. Background Art

[0002] Smart actuators are devices that deform in response to changes in environmental conditions, such as light, electricity, temperature, humidity, pH, and magnetic fields. Due to their ability to respond to environmental changes, smart actuators have important applications in medical devices, environmental monitoring, smart electronic devices, and biomimetic research. In recent years, a variety of materials have been developed for the fabrication of smart actuators, including graphene, MXene, carbon nanotubes, shape memory polymers, and hydrogels. Among them, liquid crystal elastomers (LCEs) have shown great potential in the field of smart actuators due to their reversibility, stretchability, biocompatibility, and thermal shrinkage. Researchers have recently applied LCEs to photothermally responsive actuators, and the resulting photothermally responsive actuators exhibit excellent photothermal actuation performance. When an LCE film is exposed to light, the crystalline phase of the liquid crystal transitions from an ordered state to a disordered state, resulting in a shortening of the LCE film. Due to the different thermal expansion coefficients between the two layers of the material, the interfacial adhesion forces cause the actuator to transition from a planar state to a curved state. For example, Wang et al. fabricated a PTF film composed of acrylic-based black paint and EGaIn liquid metal (LM) droplets as an excellent absorber that efficiently converts near-infrared (NIR) radiation into heat to drive liquid crystal elastomer (LCE) actuators. Alexa et al. reported that localized photothermal heating was achieved through plasmonic absorption of waveguide light, resulting in inhomogeneous thermal deformation of LCE and reversible bending along multiple axes. Yang et al. prepared carbon nanotube / liquid crystal elastomer (CNT / LCE) composite yarns through electrospinning technology and a two-step cross-linking strategy. The composite yarns exhibited a reversible shrinkage of nearly 70% and a tensile strength of 16.45 MPa.

[0003] Although researchers have made remarkable achievements in the field of intelligent actuators and have successfully developed a variety of actuators with different response mechanisms, these achievements still encounter bottlenecks in practical applications. On the one hand, in special environments such as slits, traditional stimulus sources make it difficult to precisely control the actuators, which seriously restricts the widespread application of these actuators in high-end fields such as precision control and biomedicine. On the other hand, actuators based on advanced materials such as liquid crystal elastomers (LCEs), despite their unique deformation capabilities, can only exhibit one deformation form in response to a single external stimulus. Therefore, exploring non-contact drive and high-precision control strategies has become a key direction to break through the current limitations. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the present application provides a binary synergistic light / magnetic dual-response LCE actuator, a control method and an application thereof. The actuator of the present application is a double-layer film structure composed of a liquid crystal elastomer (LCE) film and a neodymium-iron-boron (NdFeB) mixed polydimethylsiloxane (PDMS) film. The actuator is coupled and controlled by external light field and magnetic field, so that the actuator presents bidirectional bending and can probe into a light-free pipeline to grasp a light and small object. The liquid crystal elastomer (LCE) film is selected for the actuator. The shrinkage rate of the film can reach about 30%, which is much higher than the thermal expansion rate of 5%-20% of common thermal expansion materials, so that the driving effect is greatly improved. The neodymium-iron-boron (NdFeB) is a magnetic material and is sensitive to the change of magnetic field. The neodymium-iron-boron (NdFeB) is a hard magnetic material, and each magnetic particle has N and S poles with respect to the internal magnetic particles. The hard magnetic property of the neodymium-iron-boron (NdFeB) is obviously different from the property of soft magnetic materials such as iron powder, and can attract or repel the magnetic field in different directions. After the neodymium-iron-boron (NdFeB) mixed polydimethylsiloxane (PDMS) film is magnetized by a magnetizing machine, the two sides of the film present opposite magnetism and can present bending in different directions with respect to the external magnetic field in different directions. For example, the upper side of the neodymium-iron-boron (NdFeB) mixed polydimethylsiloxane (PDMS) film is N pole and the lower side is S pole. When the direction of the magnetic field is from top to bottom, the film bends downward. When the direction of the magnetic field is from bottom to top, the film bends upward, so that the curvature change of the actuator can be accurately controlled.

[0005] The present application is realized by the following technical solutions:

[0006] In a first aspect, the present application provides a binary synergistic light / magnetic dual-response LCE actuator, which comprises a liquid crystal elastomer film 1 and a neodymium-iron-boron mixed polydimethylsiloxane film 2. The two films are combined by the adhesion of polydimethylsiloxane. The two ends of the neodymium-iron-boron mixed polydimethylsiloxane film have opposite magnetism. When an external magnetic field is applied, the neodymium-iron-boron mixed polydimethylsiloxane film 2 serves as a driving layer to drive the liquid crystal elastomer film 1 to move.

[0007] When the light field is irradiated, the neodymium-iron-boron mixed polydimethylsiloxane film 2 of the actuator transfers heat to the liquid crystal elastomer film 1 in a heat transfer mode. Due to the existence of interfacial adhesion, the shrinkage of the liquid crystal elastomer film 1 drives the neodymium-iron-boron mixed polydimethylsiloxane film 2, and the whole actuator bends.

[0008] When a magnetic field is applied, the NdFeB particles with defined magnetic properties in the NdFeB hybrid polydimethylsiloxane film 2 will be driven by the magnetic force as the direction of the magnetic field changes, and the N pole and S pole of the NdFeB hybrid polydimethylsiloxane film 2 will bend in the direction of the magnetic field; if the direction of the magnetic field is adjusted, the magnetic force acting on the NdFeB hybrid polydimethylsiloxane film 2 will also be deflected in the direction of movement of the magnetic flux lines, and the curvature of the actuator will change.

[0009] Furthermore, a magnetizer is used to define the magnetism of the binary synergistic optical / magnetic dual-response LCE actuator; by adjusting the input current of the magnetizer, a unidirectional magnetic field with a strength of 20,000 Gs is output between the two poles, defining the N pole and S pole for the NdFeB mixed polydimethylsiloxane film; the magnetic drive of the actuator is achieved by a magnetic field control device, which outputs a magnetic field strength of 20-100 Gs and consists of a three-axis coil. It can output a DC or AC magnetic field in any direction within the spherical surface, accurately controlling the bidirectional bending curvature change of the actuator.

[0010] Furthermore, when the NdFeB mixed PDMS film 2 is irradiated by an external light field, the driving light source used is a solar simulator, which can simulate natural light irradiation, and the driving light power is 0.1-1.3W.

[0011] Furthermore, the bending forms of the binary synergistic optical / magnetic dual-responsive LCE actuator include S-shaped and U-shaped. When the actuator is controlled by the coupling of light field and magnetic field, the two ends are controlled by different stimulation sources and bend in different directions, and the whole will show an S-shaped bending. The curvature of each end varies in the range of 0-7.2cm. -1 When the actuator is stimulated by a single light field or magnetic field, it bends in a U-shape, with a curvature range of 0-6.5 cm. -1 .

[0012] Furthermore, the aspect ratio of the binary synergistic optical / magnetic dual-response LCE actuator is 7:1-5:1.

[0013] Furthermore, the liquid crystal elastomer film 1 is prepared by the following method, which specifically includes the following steps:

[0014] A1. Pour liquid crystal molecules into toluene and heat at 80-100° C. for 3-5 minutes to form a first mixed solution;

[0015] A2. Add octanedithiol, pentaerythritol ester, and methylpropiophenone to the mixed solution, and heat again at 80-100° C. for 3-5 minutes to form a second mixed solution;

[0016] A3, adding the DPA solution to the second mixed solution to obtain a liquid crystal elastomer solution, and then pouring it into a mold;

[0017] A4, after the liquid crystal elastomer solution is pre-cured at room temperature for 8-12 hours, heating at 80-100 DEG C for 8-12 hours, an unstretched liquid crystal elastomer film is obtained;

[0018] A5, the unstretched liquid crystal elastomer film is stretched to 120%-140% of the original length to obtain a liquid crystal elastomer film 1;

[0019] The mass ratio of the liquid crystal molecules, toluene, octane dithiol, pentaerythritol ester, methyl phenyl propyl ketone and DPA solution is 10:4:2:1:1:2.

[0020] Further, the neodymium-iron-boron mixed polydimethylsiloxane film 2 is prepared by the following method, specifically comprising the following steps:

[0021] B1, the PDMS prepolymer and the curing agent are mixed in a mass ratio of 10:1, and the obtained solution is poured into a mold, and a vacuum drying box is used to remove bubbles;

[0022] B2, the NdFeB powder is poured into the PDMS solution and mixed uniformly, the mixed solution is drop-coated on the liquid crystal elastomer film 1, the neodymium-iron-boron mixed polydimethylsiloxane film 2 is obtained on the liquid crystal elastomer film 1, and after being flattened by a spin coater, it is cured on a hot stage at 80-120 DEG C to obtain a binary synergistic light / magnetic dual-response LCE actuator.

[0023] In a second aspect, the present application provides a control method of a binary synergistic light / magnetic dual-response LCE actuator, specifically comprising the following steps:

[0024] Step one: a binary synergistic light / magnetic dual-response LCE actuator is fixed vertically to the ground, then a sunlight simulator is turned on, and the whole actuator bends to one side of the liquid crystal elastomer film 1;

[0025] Step two: the binary synergistic light / magnetic dual-response LCE actuator bends into a U shape, and the upper end is inserted into a horizontal pipeline 3, and the pipeline is dark and has constant temperature and humidity; a magnetic field control device is started to control the curvature change of the actuator end in the pipeline to be 1-4 cm -1 , which can realize the grabbing of light and small objects;

[0026] Step three: the sunlight simulator is turned off, and the part of the actuator outside the pipeline changes from the bent state to the upright state; the magnetic field direction of the magnetic field control machine is adjusted, and the inclination angle of the plane where the magnetic field is located is reduced from 90 DEG to 0 DEG at the rate of 5 DEG / s, so that the actuator can take the light and small objects out of the pipeline.

[0027] In a third aspect, the present application provides an application of a binary synergistic light / magnetic dual-response LCE actuator in preparing a reconfigurable antenna, specifically comprising the following contents:

[0028] Use a blade to cut the binary cooperative optical / magnetic dual-response LCE actuator into a rectangle with a length of 40 mm and a width of 15 mm, and fit the width of an L-shaped copper sheet with a length of 19 mm and a width of 10 mm along the axis of the actuator. L-shaped copper sheets are pasted on the upper and lower surfaces of the actuator to obtain a binary cooperative optical / magnetic dual-response LCE reconfigurable antenna.

[0029] Furthermore, a solar simulator is used to illuminate the binary cooperative optical / magnetic dual-response LCE reconfigurable antenna, or a magnetic field control device is used to change the magnetic field outside the binary cooperative optical / magnetic dual-response LCE reconfigurable antenna. The two ends of the binary cooperative optical / magnetic dual-response LCE reconfigurable antenna gradually rise up, and the overall shape is U-shaped.

[0030] Compared with the prior art, the advantages of the present invention are as follows:

[0031] 1. The present invention utilizes light field and magnetic field coupling control technology to realize a binary synergistic optical / magnetic dual-response LCE actuator that can operate in a lightless, constant temperature, and constant humidity environment. In environments such as pipelines, light intensity, temperature, and humidity are difficult to serve as stimulus sources. The present invention introduces magnetic field control to precisely control the curvature change of the actuator, utilizing the actuator's curved shape to grasp light and small objects. It can be used in mining exploration, field sampling, and ear, nose, and throat foreign body treatment.

[0032] 2. Precise adjustment of the optical power and magnetic field intensity can achieve complex bending changes of the binary synergistic optical / magnetic dual-responsive LCE actuator. Under the coupling of the optical field and magnetic field, the actuator can present an S-shaped state as a whole, with a curvature range of 0-7.2cm. -1 Under the action of light field or magnetic field alone, it can also bend into a U shape, with the curvature range of 0-6.5cm -1 between.

[0033] 3. The proposed binary synergistic optical / magnetic dual-responsive LCE actuator exhibits highly efficient optical actuation. The selected driving light source is a solar simulator, replacing the traditional near-infrared laser source. This enables the actuator to produce a large curvature change, demonstrating a technical advantage in actuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0035] Figure 1Schematic diagram of the control of a binary synergistic optical / magnetic dual-responsive LCE actuator of the present invention; the actuator's bending outside the light-shielding tube is caused by illumination by the light field, while the bending inside the light-shielding tube is controlled by the magnetic field;

[0036] Figure 2 Schematic diagram of the process for preparing the binary synergistic optical / magnetic dual-response LCE actuator of the present invention;

[0037] Figure 3 Schematic diagram of the binary synergistic optical / magnetic dual-response LCE actuator and NdFeB hybrid polydimethylsiloxane film;

[0038] Among them, (a) is a cross-sectional SEM image of the binary synergistic optical / magnetic dual-responsive LCE actuator of the present invention; the thickness of the liquid crystal elastomer film is 520 μm, and the thickness of the NdFeB mixed polydimethylsiloxane film is 300 μm;

[0039] (b) is an SEM image of the NdFeB mixed polydimethylsiloxane film of the present invention; the NdFeB particles are evenly mixed with PDMS, and the magnetic force generated when controlled by an external magnetic field is relatively uniformly distributed;

[0040] Figure 4 The relationship between the light absorption rate and wavelength of various films of the present invention is shown. It can be seen that the absorption rate of the NdFeB mixed polydimethylsiloxane film is stable at about 97% in the range of 500nm-2000nm, and the photothermal effect is good.

[0041] Figure 5 The real-time temperature change diagram and maximum temperature diagram of the actuator irradiated with different optical powers of the present invention are shown. The higher the optical power, the higher the maximum temperature. 0.2W corresponds to a maximum temperature of 49.3°C, and 1.3W corresponds to a maximum temperature of 140.5°C.

[0042] Figure 6 This is a graph showing the relationship between curvature change and power of the binary synergistic optical / magnetic dual-response LCE actuator of the present invention;

[0043] Figure 7 Schematic diagram of the structure of the binary cooperative optical / magnetic dual-response LCE reconfigurable antenna of the present invention;

[0044] Figure 8 This is a picture of the binary cooperative optical / magnetic dual-response LCE reconfigurable antenna of the present invention being controlled by a light field;

[0045] Among them, (a) is consecration;

[0046] (b) It is to open the light in the obstructed area;

[0047] Before being shielded from light, the antenna bends when exposed to light; after being shielded from light, the antenna does not bend;

[0048] Figure 9This is a picture of the binary cooperative optical / magnetic dual-response LCE reconfigurable antenna of the present invention being controlled by a magnetic field;

[0049] Where, (a) is the open magnetic field;

[0050] (b) is to open the magnetic field at the shielding location;

[0051] Before and after shading, the antenna bends following the changes in the magnetic field;

[0052] Figure 10 Graphs showing the reflection coefficients of the binary cooperative optical / magnetic dual-response LCE reconfigurable antenna of the present invention in the initial state, optical control state, and magnetic control state, respectively;

[0053] The operating frequency in the magnetic control state is 3.77GHz, and the minimum |S11| is -14.96dB; the operating frequency in the optical control state is 3.86GHz, and the minimum |S11| is -17.98dB;

[0054] In the figure: liquid crystal elastomer film 1, NdFeB mixed polydimethylsiloxane film 2, matte and constant temperature and humidity pipe 3. DETAILED DESCRIPTION

[0055] In order to clearly and completely describe the technical solution and specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings:

[0056] In order to clearly and completely describe the technical solution and specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings:

[0057] Example 1

[0058] This embodiment provides a binary synergistic optical / magnetic dual-response LCE actuator, comprising a liquid crystal elastomer film 1 and a NdFeB hybrid polydimethylsiloxane film 2; the liquid crystal elastomer film 1 and the NdFeB hybrid polydimethylsiloxane film 2 are composited by the adhesion force of polydimethylsiloxane itself; the two ends of the NdFeB hybrid polydimethylsiloxane film have opposite magnetic properties; when an external magnetic field is applied, the NdFeB hybrid polydimethylsiloxane film 2 acts as a driving layer to drive the liquid crystal elastomer film 1 to move; Figure 1As shown, the actuator is capable of multiple responses to both optical and magnetic fields. Its driving principle is as follows: when exposed to light, the NdFeB particles contained in the actuator's NdFeB-PDMS film 2 exhibit a strong photothermal effect, transferring heat to the liquid crystal elastomer film 1 via heat transfer. Due to interfacial adhesion, the contraction of the liquid crystal elastomer film 1 drives the NdFeB-PDMS film 2, causing the actuator to bend as a whole. When a magnetic field is applied, the magnetically defined NdFeB particles within the NdFeB-PDMS film 2 are driven by magnetic forces as the magnetic field changes direction, causing the NdFeB-PDMS film 2's north and south poles to bend in line with the magnetic field. Adjusting the magnetic field's direction causes the magnetic force acting on the NdFeB-PDMS film 2 to deflect in line with the magnetic flux lines, causing the actuator's curvature to change.

[0059] In this embodiment, a magnetizer is used to define the magnetism of a binary synergistic optical / magnetic dual-response LCE actuator. By adjusting the input current of the magnetizer, a unidirectional magnetic field with a strength of 20,000 Gs is output between the two poles, defining the north and south poles for the neodymium iron boron mixed polydimethylsiloxane film. The magnetic drive of the actuator is achieved by a magnetic field control device. The magnetic field control device outputs a magnetic field strength of 20-100 Gs and is composed of a three-axis coil. It can output a DC or AC magnetic field in any direction within the spherical surface, accurately controlling the bidirectional bending curvature change of the actuator.

[0060] Example 2

[0061] like Figure 2 As shown, this embodiment provides a method for manufacturing a binary synergistic optical / magnetic dual-response LCE actuator, which can achieve multiple responses to optical and magnetic fields. The structure includes: a liquid crystal elastomer film 1 and a neodymium iron boron mixed polydimethylsiloxane film 2;

[0062] The preparation method of the binary synergistic optical / magnetic dual-response LCE actuator in this example is carried out according to the following steps:

[0063] a) Pour 1g of liquid crystal molecules into 0.4g of toluene and heat at 80°C for 3min;

[0064] b) adding 0.21 g of octanedithiol, 0.09 g of pentaerythritol ester, and 0.006 g of methylpropiophenone to the mixed solution, and heating again at 80° C. for 3 minutes;

[0065] c) Add 0.003 g of di-n-propylamine and 0.137 g of toluene to the mixed solution to obtain a liquid crystal elastomer solution, which can be poured into a mold;

[0066] d) Pre-curing the liquid crystal elastomer solution at room temperature for 8 hours and then heating it at 80°C for 8-12 hours;

[0067] e) stretching the unstretched liquid crystal elastomer film to 120% of its original length to obtain a liquid crystal elastomer film 1;

[0068] f) Pour the solution obtained by mixing PDMS prepolymer and curing agent in a mass ratio of 10:1 into the above mold, and remove bubbles in a vacuum drying oven;

[0069] g) Pour NdFeB powder into the PDMS solution and mix evenly, and drop the mixed solution onto the liquid crystal elastomer film 1 to obtain a NdFeB mixed polydimethylsiloxane film 2 on the liquid crystal elastomer film 1. After flattening it using a spin coater, it is cured on a hot plate at 80°C for 1 hour to obtain a binary synergistic optical / magnetic dual-responsive LCE actuator.

[0070] The scanning electron microscope photo of the binary synergistic optical / magnetic dual-response LCE actuator prepared by the method of this embodiment is shown in the figure. Figure 3 As shown by Figure 3 It can be seen that the binary synergistic optical / magnetic dual-responsive LCE actuator was successfully prepared.

[0071] The performance of the binary synergistic optical / magnetic dual-response LCE actuator prepared by the method described in this embodiment is as follows: Figure 4 、 Figure 6 As shown, within the wavelength range of 500-2000nm, the actuator's absorption rate can reach 97%, and the maximum bending curvature change can reach 7.2cm -1 above.

[0072] Example 3

[0073] This embodiment provides a control method for a binary synergistic optical / magnetic dual-response LCE actuator, specifically comprising the following steps:

[0074] a) If Figure 1 As shown, the binary synergistic optical / magnetic dual-response LCE actuator is placed vertically on the ground, with its bottom fixed to the ground to ensure its stability. Subsequently, a solar simulator is turned on to simulate natural light irradiation, with a light power of 0.3W. As the light irradiates, the overall structure of the actuator undergoes a significant and controllable bending toward one side of the liquid crystal elastomer film 1, with a curvature change of 0.5cm. -1 ;

[0075] b) Due to the bending deformation of the binary synergistic optical / magnetic dual-responsive LCE actuator, the upper half of the actuator is placed in a lightless, constant-temperature and humidity pipe (3). The temperature, humidity, and light intensity in this pipe vary little, making it difficult to use these as stimuli. Applying magnetic field control achieves better results. After activating the magnetic field control machine, the magnetic field strength is set to 110 Gs, and the angle between the magnetic field and the ground deflects by 1° per second, driving the actuator to further bend within the pipe until its tip can accurately grasp a small, lightweight object. Because the magnetic field direction is variable, the magnetic particles within the NdFeB hybrid polydimethylsiloxane film (2) are magnetically programmed by a magnetizer, allowing the actuator tip to achieve controllable bidirectional bending.

[0076] c) After completing the grasping task, the solar simulator is smoothly shut down. The magnetic field strength is set to 90 Gs, and the angle between the magnetic field and the ground is deflected by 3° per second until it becomes parallel to the horizontal plane. Guided by the magnetic field, the upper half of the binary synergistic optical / magnetic dual-responsive LCE actuator, carrying the grasped small object, slowly exits the pipe along a pre-set path. This process not only demonstrates the LCE actuator's high flexibility and precise control capabilities in complex environments, but also lays a solid foundation for its widespread application in fields such as micro-manipulation, intelligent robotics, and biomedicine.

[0077] In this way, the light field and magnetic coupling control are used to complete the grasping operation of small objects in the pipeline.

[0078] Example 4

[0079] This embodiment provides an application of a binary cooperative optical / magnetic dual-response LCE actuator in preparing a reconfigurable antenna, specifically including the following:

[0080] Use a blade to cut the binary cooperative optical / magnetic dual-response LCE actuator into a rectangle with a length of 40mm and a width of 15mm, and then fit the width of an L-shaped copper sheet with a length of 19mm and a width of 10mm along the axis of the actuator. The L-shaped copper sheet is also attached to the upper and lower surfaces of the actuator to obtain a binary cooperative optical / magnetic dual-response LCE reconfigurable antenna. Figure 7 As shown, the dipole antenna has two horizontally extending branches, and the main structure is a binary cooperative optical / magnetic dual-response LCE actuator with the ability of optical response and magnetic response.

[0081] like Figure 8 、 Figure 9As shown in the figure, the impedance of the binary cooperative optical / magnetic dual-response LCE reconfigurable antenna is designed to be mismatched when flattened, and it cannot work without an external field. When exposed to external light or magnetic field, bending causes the impedance to gradually match, thereby activating the antenna. Under light stimulation, the bending change reaches about 3.5cm-1, and under magnetic stimulation, the bending change reaches about 2.9cm-1. Figure 10 As shown, for the optical response, a resonance point appears at 3.86 GHz with a minimum return loss (|S11|) of -17.98 dB; under the magnetic response, this value shifts slightly to 3.77 GHz, and |S11| increases to -14.96 dB, indicating that stable operation is achieved at the excitation point (i.e., the resonance point where energy is fully radiated during stimulation) in both modes.

[0082] In this embodiment, a solar simulator is used to illuminate the binary collaborative optical / magnetic dual-response LCE reconfigurable antenna or a magnetic field control device is used to change the magnetic field outside the binary collaborative optical / magnetic dual-response LCE reconfigurable antenna. The two ends of the binary collaborative optical / magnetic dual-response LCE reconfigurable antenna gradually rise, and the overall shape is U-shaped; the optical power or magnetic field strength is changed to adjust the operating frequency of the reconfigurable antenna.

[0083] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0085] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A binary synergistic optical / magnetic dual-response LCE actuator, characterized in that: The invention comprises a liquid crystal elastomer film (1) and a NdFeB mixed polydimethylsiloxane film (2); the liquid crystal elastomer film (1) and the NdFeB mixed polydimethylsiloxane film (2) are compounded by the adhesive force of polydimethylsiloxane itself; the two ends of the NdFeB mixed polydimethylsiloxane film have opposite magnetic properties; when an external magnetic field is applied, the NdFeB mixed polydimethylsiloxane film (2) acts as a driving layer to drive the liquid crystal elastomer film (1) to move; When the light field is irradiated, the NdFeB mixed polydimethylsiloxane film (2) of the actuator transfers heat to the liquid crystal elastomer film (1) in a heat transfer manner. Due to the existence of the interfacial adhesion force, the contraction of the liquid crystal elastomer film (1) drives the NdFeB mixed polydimethylsiloxane film (2), and the actuator as a whole bends. When a magnetic field is applied, the NdFeB particles with defined magnetism in the NdFeB-hybrid polydimethylsiloxane film (2) are driven by the magnetic force as the direction of the magnetic field changes, and the N pole and S pole of the NdFeB-hybrid polydimethylsiloxane film (2) bend in accordance with the direction of the magnetic field; if the direction of the magnetic field is adjusted, the magnetic force on the NdFeB-hybrid polydimethylsiloxane film (2) will also deflect in the direction of the movement of the magnetic flux lines, and the curvature of the actuator will change.

2. The binary synergistic optical / magnetic dual-response LCE actuator according to claim 1, characterized in that: A magnetizer is used to define the magnetism of a binary synergistic optical / magnetic dual-response LCE actuator. By adjusting the input current of the magnetizer, a unidirectional magnetic field with a strength of 20,000 Gs is output between the two poles, defining the north and south poles for the neodymium iron boron mixed polydimethylsiloxane film. The magnetic drive of the actuator is achieved by a magnetic field control device. The magnetic field control device outputs a magnetic field strength of 20-100 Gs and is composed of a three-axis coil. It can output a DC or AC magnetic field in any direction within the spherical surface, accurately controlling the bidirectional bending curvature change of the actuator.

3. The binary synergistic optical / magnetic dual-response LCE actuator according to claim 1, characterized in that: When the NdFeB mixed polydimethylsiloxane film (2) is irradiated by an external light field, the driving light source used is a sunlight simulator, which can simulate natural light irradiation, and the driving light power is 0.1-1.3W.

4. The binary synergistic optical / magnetic dual-response LCE actuator according to claim 1, characterized in that: The bending forms of the binary synergistic optical / magnetic dual-response LCE actuator include S-shaped and U-shaped. When the actuator is controlled by the coupling of light field and magnetic field, the two ends are controlled by different stimulation sources and bend in different directions. The whole actuator will show an S-shaped curvature. The curvature of each end varies in the range of 0-7.2cm. -1 When the actuator is stimulated by a single light field or magnetic field, it bends in a U-shape, with a curvature range of 0-6.5cm. -1 .

5. The binary synergistic optical / magnetic dual-response LCE actuator according to claim 1, characterized in that: The liquid crystal elastomer film (1) is prepared by the following method, which specifically comprises the following steps: A1. Pour liquid crystal molecules into toluene and heat at 80-100° C. for 3-5 minutes to form a first mixed solution; A2. Add octanedithiol, pentaerythritol ester, and methylpropiophenone to the mixed solution, and heat again at 80-100° C. for 3-5 minutes to form a second mixed solution; A3, adding the DPA solution to the second mixed solution to obtain a liquid crystal elastomer solution, and then pouring it into a mold; A4. Pre-curing the liquid crystal elastomer solution at room temperature for 8-12 hours, and then heating at 80-100° C. for 8-12 hours to obtain an unstretched liquid crystal elastomer film; A5, stretching the unstretched liquid crystal elastomer film to 120%-140% of its original length to obtain a liquid crystal elastomer film (1); The mass ratio of the liquid crystal molecules, toluene, octanedithiol, pentaerythritol ester, methylpropiophenone, and DPA solution is 10:4:2:1:1:

2.

6. The binary synergistic optical / magnetic dual-response LCE actuator according to claim 1, characterized in that: The NdFeB mixed polydimethylsiloxane film (2) is prepared by the following method, which specifically includes the following steps: B1. Mix PDMS prepolymer and curing agent in a mass ratio of 10:1, pour the resulting solution into a mold, and remove bubbles in a vacuum drying oven; B2. Pour NdFeB powder into the PDMS solution and mix evenly, and drop the mixed solution onto the liquid crystal elastomer film (1) to obtain a NdFeB mixed polydimethylsiloxane film (2) on the liquid crystal elastomer film (1). After flattening it using a spin coater, it is cured on a hot plate at 80°C-120°C to obtain a binary synergistic optical / magnetic dual-responsive LCE actuator.

7. The control method of a binary cooperative optical / magnetic dual-response LCE actuator according to claim 1, characterized in that: The specific steps include: Step 1: Place one section of the binary synergistic optical / magnetic dual-response LCE actuator vertically on the ground, then turn on the solar simulator, and the actuator as a whole bends toward one side of the liquid crystal elastomer film (1); Step 2: The binary synergistic optical / magnetic dual-response LCE actuator bends into a U-shape, and the upper end is inserted into a horizontal pipe (3) where there is no light and the temperature and humidity are constant; the magnetic field control device is activated to control the curvature of the actuator end in the pipe to change by 1-4 cm. -1 , it can realize the grasping of light and small objects; Step 3: Turn off the solar simulator, and the part of the actuator outside the pipe changes from a bent state to an upright state; adjust the magnetic field to control the magnetic field direction of the machine, and reduce the inclination angle of the magnetic field plane from 90° to 0° at 5° / s, so that the actuator can carry light and small objects out of the pipe.

8. The application of the binary cooperative optical / magnetic dual-response LCE actuator in preparing a reconfigurable antenna according to claim 1, characterized in that: Specifically include the following: Use a blade to cut the binary cooperative optical / magnetic dual-response LCE actuator into a rectangle with a length of 40 mm and a width of 15 mm, and fit the width of an L-shaped copper sheet with a length of 19 mm and a width of 10 mm along the axis of the actuator. L-shaped copper sheets are pasted on the upper and lower surfaces of the actuator to obtain a binary cooperative optical / magnetic dual-response LCE reconfigurable antenna.

9. The use of a binary cooperative optical / magnetic dual-response LCE actuator as claimed in claim 8 in preparing a reconfigurable antenna, characterized in that: By using a solar simulator to illuminate the binary synergistic optical / magnetic dual-response LCE reconfigurable antenna or using a magnetic field control device to change the magnetic field outside the binary synergistic optical / magnetic dual-response LCE reconfigurable antenna, the two ends of the binary synergistic optical / magnetic dual-response LCE reconfigurable antenna gradually rise up, and the overall shape is U-shaped.

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