Binary collaborative optical / magnetic double-response LCE actuator, control method and application thereof

Abstract

The invention discloses a binary synergetic light / magnetic double-response LCE actuator, a control method and application thereof, and belongs to the technical field of electromagnetic functional materials. The binary synergetic light / magnetic double-response LCE actuator 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 compounded through the adhesive force of polydimethylsiloxane; 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 serves as a driving layer to drive the liquid crystal elastomer film to move; according to the invention, a light field and magnetic field coupling control technology is utilized, so that the binary collaborative light / magnetic double-response LCE actuator can work in a dark, constant-temperature and constant-humidity environment; in a pipeline and other environments, light intensity, temperature, humidity and the like are difficult to serve as stimulation sources, magnetic field control is introduced, curvature change of the actuator can be accurately controlled, and light and small objects are grabbed through the bending form of the actuator; the device can be used for mine exploration, field sampling, 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 when environmental conditions change. Common external conditions include 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 to manufacture smart actuators, such as 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 LCE to photothermal responsive actuators, and the prepared photothermal responsive actuators show excellent photothermal driving performance. When the LCE film is exposed to light, the crystal phase of the liquid crystal changes 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 actuator changes from a planar state to a curved state under the action of the interfacial adhesion force. For example, Wang et al. fabricated PTF films composed of acrylic-based black paint and EGaIn liquid metal (LM) droplets as excellent absorbers that efficiently convert near-infrared (NIR) radiation into heat to drive liquid crystal elastomer (LCE) actuators. Alexa et al. reported local photothermal heating through plasmonic absorption of waveguide light and resulted in inhomogeneous thermal deformation of LCE, achieving reversible bending along multiple axes. Yang et al. prepared carbon nanotube / liquid crystal elastomer (CNT / LCE) composite yarns by electrospinning technology and a two-step cross-linking strategy, which 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 accurately control 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 (LCE), despite their unique deformation capabilities, can only exhibit one deformation form for a single external stimulus. Therefore, exploring non-contact drive and high-precision control strategies has become a key direction to break through current limitations. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a binary synergistic optical / magnetic dual-response LCE actuator, a control method and its application. The actuator of the present invention is a double-layer film structure consisting of a liquid crystal elastomer (LCE) film and a neodymium iron boron (NdFeB) mixed polydimethylsiloxane (PDMS) film; the actuator is controlled by the coupling of an external light field and a magnetic field, so that the actuator exhibits bidirectional bending, and a part of the structure can be inserted into a light-free pipe to grasp light and small objects. The actuator uses a liquid crystal elastomer (LCE) film, which can shrink by about 30%, which greatly improves the driving effect compared to the 5%-20% thermal expansion rate of common thermal expansion materials. Neodymium iron boron (NdFeB) is a magnetic material that responds sensitively to changes in the magnetic field, and as a hard magnetic material, each magnetic particle inside has an N pole and an S pole. The hard magnetic properties of neodymium iron boron (NdFeB) are significantly different from those of soft magnetic materials such as iron powder, and can attract or repel magnetic fields in different directions. After the neodymium iron boron (NdFeB) mixed polydimethylsiloxane (PDMS) film is processed by a magnetizer, the two sides of the film present opposite magnetism, and can bend in different directions to external magnetic fields in different directions. For example, the upper side of the neodymium iron boron (NdFeB) mixed polydimethylsiloxane (PDMS) film is the N pole and the lower side is the S pole. When the magnetic field is directed from top to bottom, the film bends downward; when the magnetic field is directed from bottom to top, the film bends upward, thereby achieving precise control of the curvature change of the actuator.

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

[0006] In the first aspect, the present invention provides a binary synergistic optical / magnetic dual-response LCE actuator, comprising 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 adhesion force of polydimethylsiloxane itself; the two ends of the NdFeB mixed polydimethylsiloxane film have opposite magnetism; 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;

[0007] When the light field is irradiated, the NdFeB-polydimethylsiloxane film 2 of the actuator transfers heat to the liquid crystal elastomer film 1 in the form of heat transfer. Due to the existence of the interface adhesion force, the contraction of the liquid crystal elastomer film 1 drives the NdFeB-polydimethylsiloxane film 2, and the actuator bends as a whole.

[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 on the NdFeB hybrid polydimethylsiloxane film 2 will also be deflected in the direction of the 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, and the N pole and S pole are defined for the NdFeB mixed polydimethylsiloxane film; the magnetic drive of the actuator is achieved by a magnetic field control device, and the magnetic field control device has an output magnetic field strength of 20-100 Gs, is composed of a three-axis coil, and can output a DC or AC magnetic field in any direction within the spherical surface, and accurately control the bidirectional bending curvature change of the actuator.

[0010] Furthermore, when the NdFeB mixed polydimethylsiloxane 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 shapes 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 stimulus sources and bend in different directions, and the whole will present an S-shaped bending, and 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, the whole actuator presents a U-shaped bend with a curvature range of 0-6.5cm -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 comprises the following steps:

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

[0015] A2, adding octanedithiol, pentaerythritol ester and methyl propiophenone to the mixed solution, and heating 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, the liquid crystal elastomer solution is pre-cured at room temperature for 8-12 hours, and then heated at 80-100° C. for 8-12 hours to obtain an unstretched liquid crystal elastomer film;

[0018] A5, stretching the unstretched liquid crystal elastomer film 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, octanedithiol, pentaerythritol ester, methyl acetophenone, and DPA solution is 10:4:2:1:1:2.

[0020] Furthermore, the NdFeB mixed polydimethylsiloxane film 2 is prepared by the following method, which specifically includes the following steps:

[0021] B1. Mix PDMS prepolymer and curing agent in a mass ratio of 10:1, pour the resulting solution into a mold, and use a vacuum drying oven to remove bubbles;

[0022] B2. Pour NdFeB powder into the PDMS solution and mix evenly, and drop the mixed solution on 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, solidify it on a hot plate at 80℃-120℃ to obtain a binary synergistic optical / magnetic dual-response LCE actuator.

[0023] In a second aspect, the present invention provides a control method for a binary cooperative optical / magnetic dual-response LCE actuator, which specifically comprises the following steps:

[0024] 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;

[0025] Step 2: The binary synergistic optical / magnetic dual-response LCE actuator bends into a U-shape, and the upper end is inserted into the horizontal pipe 3, where there is no light and the temperature and humidity are constant; the magnetic field control device is started to control the curvature change of the actuator end in the pipe by 1-4 cm -1 , you can grab light and small objects;

[0026] 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 plane where the magnetic field is located from 90° to 0° at a rate of 5° / s, thereby enabling the actuator to bring light and small objects out of the pipe.

[0027] In a third aspect, the present invention provides an application of a binary cooperative optical / magnetic dual-response LCE actuator in preparing a reconfigurable antenna, specifically including 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. The L-shaped copper sheet is 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 synergistic optical / magnetic dual-response LCE reconfigurable antenna or a magnetic field control device is used to change the magnetic field outside the binary synergistic optical / magnetic dual-response LCE reconfigurable antenna, and the two ends of the binary synergistic optical / magnetic dual-response LCE reconfigurable antenna gradually rise up, forming a U-shape as a whole.

[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 collaborative optical / magnetic dual-response LCE actuator that can work in a lightless, constant temperature, and constant humidity environment. In pipeline environments, 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, and utilizes the curved shape of the actuator to grab light and small objects. It can be used in mining exploration, field sampling, and ear, nose, and throat foreign body treatment.

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

[0033] 3. The binary synergistic optical / magnetic dual-response LCE actuator proposed in the present invention has efficient light-driven characteristics. The selected driving light source is a solar simulator, which replaces the traditional near-infrared laser light source, and can make the actuator produce a larger bending curvature change, which has technical advantages in driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0035] Figure 1The schematic diagram of the control of a binary cooperative optical / magnetic dual-response LCE actuator of the present invention; the bending of the actuator outside the light-shielding pipe is caused by the irradiation of the light field, and the bending inside the light-shielding pipe is controlled by the magnetic field;

[0036] Figure 2 A schematic diagram of the process of preparing a binary synergistic optical / magnetic dual-response LCE actuator according to the present invention;

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

[0038] Among them, (a) is a cross-sectional SEM image of the binary synergistic optical / magnetic dual-response 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 a 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 evenly 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 at 500nm-2000nm is stable at about 97%, and the photothermal effect is good.

[0041] Figure 5 The real-time temperature change diagram and the 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 This is a 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 place;

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

[0048] Fig. 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 change of magnetic field;

[0052] Fig.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 magnetically controlled state is 3.77 GHz, and the minimum value |S11| is -14.96 dB; the operating frequency in the optically controlled state is 3.86 GHz, and the minimum value |S11| is -17.98 dB;

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

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

[0057] In order to clearly and completely describe the technical solution and its specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings of the specification:

[0058] Example 1

[0059] The present embodiment provides a binary cooperative optical / magnetic dual-response LCE actuator, comprising 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 adhesion 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; Figure 1As shown, the actuator can complete multiple responses to light field and magnetic field, and the driving principle is: when the light field is irradiated, the NdFeB particles contained in the NdFeB mixed polydimethylsiloxane film 2 of the actuator have a good photothermal effect, and transfer heat to the liquid crystal elastomer film 1 in the form of heat transfer. Due to the existence of interfacial adhesion, the contraction of the liquid crystal elastomer film 1 will drive the NdFeB mixed polydimethylsiloxane film 2, and the actuator will bend as a whole; when the magnetic field is applied, the NdFeB particles with defined magnetism in the NdFeB mixed polydimethylsiloxane film 2 will be driven by magnetic force as the direction of the magnetic field changes, and the N pole and S pole of the NdFeB mixed polydimethylsiloxane film 2 will 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 mixed polydimethylsiloxane film 2 will also deflect along the direction of the movement of the magnetic flux lines, and the curvature of the actuator will also change.

[0060] In this embodiment, a magnetizer is used to define the magnetism of the binary collaborative 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, and the N pole and S pole are defined for the NdFeB mixed polydimethylsiloxane film; the magnetic drive of the actuator is achieved by a magnetic field control device, and the magnetic field control device outputs a magnetic field strength of 20-100 Gs, consists of a three-axis coil, and 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.

[0061] Example 2

[0062] like Figure 2 As shown, this embodiment provides a method for manufacturing a binary cooperative optical / magnetic dual-response LCE actuator, which can complete multiple responses to optical fields and magnetic fields, and the structure includes: a liquid crystal elastomer film 1 and a NdFeB mixed polydimethylsiloxane film 2;

[0063] The preparation method of the binary synergistic optical / magnetic dual-response LCE actuator in this example is carried out according to the following steps:

[0064] a) Pour 1g of liquid crystal molecules into 0.4g of toluene and heat at 80°C for 3min;

[0065] 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;

[0066] 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 the mold;

[0067] d) After the liquid crystal elastomer solution is pre-cured at room temperature for 8 hours, it is heated at 80°C for 8-12 hours;

[0068] e), stretching the unstretched liquid crystal elastomer film to 120% of its original length to obtain a liquid crystal elastomer film 1;

[0069] f), pouring a solution obtained by mixing PDMS prepolymer and curing agent in a mass ratio of 10:1 into the above mold, and removing bubbles in a vacuum drying oven;

[0070] g) Pour NdFeB powder into the PDMS solution and mix evenly, and drop the mixed solution on 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-response LCE actuator.

[0071] 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 Figure 3 As shown by Figure 3 It can be seen that the binary synergistic optical / magnetic dual-responsive LCE actuator was successfully prepared.

[0072] 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.

[0073] Example 3

[0074] This embodiment provides a control method for a binary cooperative optical / magnetic dual-response LCE actuator, which specifically includes the following steps:

[0075] a) If Figure 1 As shown, the binary synergistic optical / magnetic dual-response LCE actuator is placed vertically on the ground, and the bottom is fixed to the ground to ensure its stability; then, the solar simulator is turned on to simulate the irradiation of natural light, and the light power reaches 0.3W; as the light irradiates, the overall structure of the actuator bends significantly and controllably toward one side of the liquid crystal elastomer film 1, and the curvature changes by 0.5cm -1 ;

[0076] b) Due to the bending deformation of the binary synergistic optical / magnetic dual-response LCE actuator, the upper part of the actuator is sent into a lightless pipe 3 that maintains constant temperature and humidity; the temperature, humidity and light intensity in the pipe do not change much, and it is difficult to use temperature, humidity and light as stimulus sources. The application of magnetic field regulation can achieve better results; after starting the magnetic field regulation machine, the magnetic field strength is set to 110Gs, and the angle between the magnetic field direction and the ground is deflected by 1° per second, thereby driving the actuator to bend further in the pipe until its end can accurately grasp light and small objects; since the magnetic field direction is variable, the magnetic particles in the NdFeB mixed polydimethylsiloxane film 2 are magnetically programmed by the magnetizer, so the end of the actuator can be adjusted to bend in both directions.

[0077] c) After completing the grasping task, the solar simulator is turned off smoothly. At the same time, the magnetic field strength is set to 90Gs, and the angle between the magnetic field direction and the ground is deflected by 3° per second until it is parallel to the horizontal plane; under the guidance of the magnetic field, the upper part of the binary synergistic optical / magnetic dual-response LCE actuator, carrying the grasped light and small objects, slowly leaves the pipeline along the preset path; this process not only demonstrates the high flexibility and precise control ability of the LCE actuator in complex environments, but also lays a solid foundation for its wide application in micro-manipulation, intelligent robots and biomedicine.

[0078] In this way, the light field and magnetic coupling control are used to complete the grabbing operation of light and small objects in the pipeline.

[0079] Example 4

[0080] This embodiment provides an application of a binary cooperative optical / magnetic dual-response LCE actuator in preparing a reconfigurable antenna, which specifically includes the following contents:

[0081] 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 the L-shaped copper sheet with a length of 19 mm and a width of 10 mm along the axis of the actuator. The L-shaped copper sheet is pasted on both the upper and lower sides 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 synergistic optical / magnetic dual-response LCE actuator with the capabilities of optical response and magnetic response.

[0082] like Figure 8 , Fig. 9As shown, 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 optical stimulation, the bending change reaches about 3.5cm-1, and under magnetic stimulation, the bending change reaches about 2.9cm-1. Fig.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.

[0083] 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 up and the whole is U-shaped. The optical power or magnetic field strength is changed to adjust the operating frequency of the reconfigurable antenna.

[0084] 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, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0085] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0086] In addition, 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 adhesion 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-hybrid 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 interface adhesion force, the contraction of the liquid crystal elastomer film (1) drives the NdFeB-hybrid 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) will be driven by 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 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. A binary synergistic optical / magnetic dual-response LCE actuator as claimed in 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, and the N pole and S pole are defined for the NdFeB mixed polydimethylsiloxane film. The magnetic drive of the actuator is achieved by a magnetic field control device. The magnetic field control device has an output 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, and accurately control the bidirectional bending curvature change of the actuator.

3. A binary synergistic optical / magnetic dual-response LCE actuator as claimed in 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 solar simulator, which can simulate natural light irradiation, and the driving light power is 0.1-1.3W.

4. A binary synergistic optical / magnetic dual-response LCE actuator as claimed in claim 1, characterized in that: The bending forms of the binary synergistic optical / magnetic dual-response LCE actuator include S-type and U-type. When the actuator is controlled by the coupling of the optical field and the magnetic field, the two ends are controlled by different stimulus sources and bend in different directions. The whole actuator will present 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, the whole actuator presents a U-shaped bend with a curvature range of 0-6.5cm -1 .

5. A binary synergistic optical / magnetic dual-response LCE actuator as claimed in 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 the liquid crystal molecules into toluene and heat at 80-100° C. for 3-5 minutes to form a first mixed solution; A2, adding octanedithiol, pentaerythritol ester and methyl propiophenone to the mixed solution, and heating 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, the liquid crystal elastomer solution is pre-cured at room temperature for 8-12 hours, and then heated 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, methyl acetophenone, and DPA solution is 10:4:2:1:1:

2.

6. A binary synergistic optical / magnetic dual-response LCE actuator as claimed in claim 1, characterized in that: The NdFeB mixed polydimethylsiloxane film (2) is prepared by the following method, which specifically comprises 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 then 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, the film is cured on a hot plate at 80°C-120°C to obtain a binary synergistic optical / magnetic dual-response LCE actuator.

7. A control method for a binary cooperative optical / magnetic dual-response LCE actuator as claimed in claim 1, characterized in that: The specific steps include: Step 1: a section of the binary synergistic optical / magnetic dual-response LCE actuator is fixedly placed vertically on the ground, and then a solar simulator is turned on, so that 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, with the upper end inserted into a horizontal pipe (3) where there is no light and the temperature and humidity are constant; the magnetic field control device is started to control the curvature change of the actuator end in the pipe by 1-4 cm -1 , you can grab 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 plane where the magnetic field is located from 90° to 0° at a rate of 5° / s, thereby enabling the actuator to bring light and small objects out of the pipe.

8. The application of a binary cooperative optical / magnetic dual-response LCE actuator in preparing a reconfigurable antenna as claimed in claim 1, characterized in that: The specific contents 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. The L-shaped copper sheet is pasted on the upper and lower surfaces of the actuator to obtain a binary cooperative optical / magnetic dual-response LCE reconfigurable antenna.

9. The application 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 whole is U-shaped.

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