Bimodal eutectic gel sensor for hand action recognition and preparation method of bimodal eutectic gel sensor
By preparing a dual-modal eutectic gel sensor, the problem that traditional sensors are difficult to capture a variety of hand dynamic information is solved, and multi-dimensional accurate recognition and synchronous signal monitoring of hand movements are achieved, with excellent self-repair performance and high sensitivity.
Patent Information
- Application Number
- CN202510689375.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-27
- Publication Date
- 2025-09-05
AI Technical Summary
Traditional flexible sensors are usually only sensitive to a certain signal or parameter, and it is difficult to simultaneously capture multiple dynamic information of the hand, such as pressure, bending, temperature, etc., resulting in inaccurate hand movement recognition.
A dual-modal eutectic gel sensor was prepared by combining a polymerizable low eutectic solvent, phytic acid, hollow polyaniline microspheres, graphene oxide, a photoinitiator and a cross-linker to prepare a sensor that can simultaneously sense multiple physical signals. The self-healing and mechanical properties were enhanced by utilizing the electrostatic interactions and multiple hydrogen bonds between phytic acid and the polymerizable low eutectic solvent and the hollow polyaniline microspheres and graphene oxide.
It achieves multi-dimensional and accurate recognition of sign language and hand grasping movements, has excellent sensitivity, fast response time and reliable durability, and can simultaneously monitor strain and pressure signals, improving the accuracy of hand movement recognition.
Smart Images
Figure CN120590734A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of eutectic gel flexible sensing methods, and in particular relates to a dual-modal eutectic gel sensor for hand motion recognition, and also relates to a method for preparing the dual-modal eutectic gel sensor. Background Art
[0002] With the continuous development of flexible sensing technology, flexible sensors are showing broad application prospects in fields such as human health monitoring, motion analysis, and human-computer interaction. They are lightweight, soft, conformable to the human body, and responsive. They can detect subtle changes on the skin surface in real time, providing new solutions for scenarios such as smart healthcare, rehabilitation assistance, and virtual reality.
[0003] However, traditional flexible sensors are typically sensitive only to a single signal or parameter, limiting their application in complex scenarios. For example, a single signal sensor struggles to simultaneously capture multiple dynamic hand information, such as pressure, bending, and temperature, resulting in inaccurate or incomplete recognition of hand movements. This is particularly evident in scenarios requiring multimodal information fusion, such as gesture recognition and virtual manipulation, and also hinders the performance improvement of sensor systems.
[0004] Therefore, the development of multimodal flexible sensors has become an important direction of current research. Multimodal sensors can sense multiple physical signals simultaneously, achieve more comprehensive and accurate motion recognition, and provide support for complex interactive scenarios. To achieve this goal, the sensor must not only have multimodal sensing capabilities, but also have good environmental stability, extremely high flexibility and mechanical durability, as well as excellent conductivity and sensitivity to ensure reliability and durability in different usage environments. In addition, sensors with self-healing capabilities can extend their service life and improve the stability and maintenance convenience of the system. In summary, the development of flexible gel sensors that integrate multimodal sensing, strong environmental adaptability and self-healing properties is of great significance for promoting intelligent health monitoring and high-precision human-computer interaction. Summary of the Invention
[0005] The first purpose of the present invention is to provide a dual-modal eutectic gel sensor for hand motion recognition, which solves the problem in the prior art that a single-signal flexible sensor is difficult to simultaneously capture multiple dynamic information of the hand, resulting in inaccurate hand motion recognition.
[0006] Another object of the present invention is to provide a method for preparing the bimodal eutectic gel sensor.
[0007] The first technical solution adopted by the present invention is a method for preparing a dual-modal eutectic gel for hand motion recognition, which is composed of the following components by mass: 2-6 g of a polymerizable low eutectic solvent, 0.1 g-1.2 g of phytic acid, 5 mg-60 mg of hollow polyaniline microspheres, 20 mg-180 mg of graphene oxide, 20 mg-60 mg of a photoinitiator, and 4 mg-12 mg of a cross-linker.
[0008] The first technical solution of the present invention is also characterized in that: The polymerizable deep eutectic solvent is composed of a hydrogen bond acceptor and a polymerizable hydrogen bond donor; the hydrogen bond acceptor is any one of tetramethylammonium chloride, acetylcholine, betaine or choline chloride; The polymerizable hydrogen bond donor is any one of acrylic acid, itaconic acid or acrylamide.
[0009] The photoinitiator is photoinitiator 1173 or photoinitiator 2959.
[0010] The cross-linking agent is polyethylene glycol diacrylate or N,N-methylenebisacrylamide.
[0011] The second technical solution adopted by the present invention is a method for preparing a dual-modal eutectic gel sensor for hand motion recognition, which specifically comprises the following steps: S1: Preparation of polymerizable deep eutectic solvent; S2: adding phytic acid, hollow polyaniline microspheres, graphene oxide, photoinitiator and crosslinker into the polymerizable eutectic solvent prepared in S1 and magnetically stirring to obtain a uniform precursor solution; S3: A mold is made using glass and silicone gaskets, and the precursor solution prepared in S2 is injected into the mold and polymerized using ultraviolet light to obtain a eutectic gel; S4: The eutectic gel prepared in S3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor for hand motion recognition.
[0012] The second technical solution of the present invention is also characterized in that: The specific steps of preparing the polymerizable deep eutectic solvent in S1 are: heating and mixing the hydrogen bond acceptor and the polymerizable hydrogen bond donor in a molar ratio of 1:2 to prepare the polymerizable deep eutectic solvent.
[0013] The mass ratio of phytic acid in S2 is 5 wt%-20 wt% of the mass percentage of the polymerizable low eutectic solvent.
[0014] The particle size of hollow polyaniline microspheres is 1.1 um, and the size of graphene oxide is 5-10 um. The thickness of the silicone gasket in S3 is 1 mm, 1.5 mm, or 2 mm.
[0015] The duration of UV irradiation in S3 is 1-2h.
[0016] The beneficial effects of the present invention are: The present invention provides a dual-modal eutectic gel sensor for hand motion recognition and a preparation method thereof. The electrostatic interaction between phytic acid and a polymerizable low eutectic solvent and between hollow polyaniline microspheres and graphene oxide, as well as multiple hydrogen bonds, bring excellent self-healing properties and adjustable mechanical properties to the eutectic gel. At the same time, the introduction of hollow polyaniline microspheres and a conductive network of graphene oxide significantly enhances the conductivity and mechanical properties of the gel. The gel based on the strain-pressure dual sensing mode exhibits excellent sensitivity, fast response time and reliable durability, and realizes multi-dimensional and precise recognition of complex movements such as sign language and grasping, providing a reliable solution for high-precision human-computer interaction. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic diagram of the process of preparing a dual-modal eutectic gel sensor for hand motion recognition according to the present invention; Figure 2 Schematic diagram of the installation of the dual-modal flexible sensor for hand motion recognition according to the present invention; Figure 3 1 is a comparison chart of the mechanical properties of Example 1 and Comparative Example 1; Figure 4 The conductivity comparison diagram of Example 1 and Comparative Examples 1, 2, and 3 is shown; Figure 5 GF schematic diagram of the eutectic gel strain sensor prepared by Example 1 of the present invention; Figure 6 GF schematic diagram of the eutectic gel pressure sensor prepared by Example 1 of the present invention; Figure 7 This is a schematic diagram of the recognition of the sign language "thank you" using the eutectic gel dual-modal sensor prepared in Example 1 of the present invention; Figure 8 Schematic diagram of the dynamic recognition of grasping objects using the eutectic gel dual-modal sensor prepared in Example 1 of the present invention. DETAILED DESCRIPTION
[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] Example 1 The present invention provides a dual-modal eutectic gel sensor for hand motion recognition, which is composed of the following components, by mass: 2-6 g of a polymerizable low eutectic solvent, 0.1 g-1.2 g of phytic acid, 5 mg-60 mg of hollow polyaniline microspheres, 20 mg-180 mg of graphene oxide, 20 mg-60 mg of a photoinitiator, and 4 mg-12 mg of a cross-linking agent.
[0020] The polymerizable low eutectic solvent is composed of a hydrogen bond acceptor and a polymerizable hydrogen bond donor; the hydrogen bond acceptor is any one of tetramethylammonium chloride, acetylcholine, betaine or choline chloride; and the polymerizable hydrogen bond donor is any one of acrylic acid, itaconic acid and acrylamide.
[0021] The photoinitiator is photoinitiator 1173 or photoinitiator 2959; the crosslinking agent is polyethylene glycol diacrylate or N,N-methylenebisacrylamide.
[0022] Example 2 This embodiment provides a method for preparing a dual-modal eutectic gel sensor, using the dual-modal eutectic gel sensor for hand motion recognition provided in Example 1, such as Figure 1-2 As shown, the following steps are included: S1: Preparation of a deep eutectic solvent: heating and mixing a hydrogen bond acceptor and a polymerizable hydrogen bond donor in a molar ratio of 1:2 to prepare a polymerizable deep eutectic solvent. The specific steps are as follows: 1.97 g of choline chloride and 2.03 g of acrylic acid were added to a glass bottle and magnetically stirred in an 80°C oil bath for 1 hour to prepare a polymerizable low eutectic solvent.
[0023] S2: Phytic acid, hollow polyaniline microspheres, graphene oxide, a photoinitiator, and a crosslinker are added to the polymerizable eutectic solvent prepared in S1 and magnetically stirred to obtain a uniform precursor solution. The specific steps are as follows: Take 2 g of the polymerizable deep eutectic solvent prepared in S1, add 0.1 g of phytic acid, 5 mg of hollow polyaniline microspheres, 20 mg of graphene oxide, 20 mg of photoinitiator 2959, and 4 mg of polyethylene glycol diacrylate to the polymerizable deep eutectic solvent in sequence, and stir magnetically to obtain a uniformly mixed precursor solution; Among them, the particle size of hollow polyaniline microspheres is 1.1 um and the size of graphene oxide is 5 um.
[0024] S3: A 10*10 cm glass sheet and a 1.5 mm thick silicone gasket were selected to form a mold. The precursor solution prepared in S2 was injected into the mold and irradiated with ultraviolet light for 1 h to polymerize it to obtain a eutectic gel. Before the precursor solution in S3 is injected into the mold, bubbles in the precursor solution are first removed by ultrasonication and then injected into the mold.
[0025] S4: The eutectic gel prepared in S3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor that can be used for hand motion recognition.
[0026] Example 3 This embodiment provides a method for preparing a dual-modal eutectic gel sensor, using the dual-modal eutectic gel sensor for hand motion recognition provided in Example 1, such as Figure 1-2 As shown, the following steps are included: S1: Preparation of a deep eutectic solvent: heating and mixing a hydrogen bond acceptor and a polymerizable hydrogen bond donor in a molar ratio of 1:2 to prepare a polymerizable deep eutectic solvent. The specific steps are as follows: 2.36 g of tetramethylammonium chloride and 2.436 g of itaconic acid were added to a glass bottle and magnetically stirred in an oil bath at 90° C. for 2 hours to prepare a polymerizable low eutectic solvent.
[0027] S2: Phytic acid, hollow polyaniline microspheres, graphene oxide, a photoinitiator, and a crosslinker are added to the polymerizable eutectic solvent prepared in S1 and magnetically stirred to obtain a uniform precursor solution. The specific steps are as follows: 4 g of the polymerizable deep eutectic solvent prepared in S1 was added to 0.4 g of phytic acid, 20 mg of hollow polyaniline microspheres, 60 mg of graphene oxide, 30 mg of photoinitiator 1173, and 7 mg of N,N-methylenebisacrylamide in sequence, and magnetic stirring was performed to obtain a uniformly mixed precursor solution. Among them, the particle size of hollow polyaniline microspheres is 1.1 um and the size of graphene oxide is 7 um.
[0028] S3: A 10*10 cm glass sheet and a 1.5 mm thick silicone gasket were selected to form a mold. The precursor solution prepared in S2 was injected into the mold and irradiated with ultraviolet light for 1.5 h to polymerize the solution and obtain a eutectic gel. Before the S3 precursor solution is injected into the mold, the bubbles in the precursor solution are first removed by ultrasonication and then injected into the mold.
[0029] S4: The eutectic gel prepared in S3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor that can be used for hand motion recognition.
[0030] Example 4 This embodiment provides a method for preparing a dual-modal eutectic gel sensor, using the dual-modal eutectic gel sensor for hand motion recognition provided in Example 1, such as Figure 1-2 As shown, the following steps are included: S1: Preparation of a deep eutectic solvent: heating and mixing a hydrogen bond acceptor and a polymerizable hydrogen bond donor in a molar ratio of 1:2 to prepare a polymerizable deep eutectic solvent. The specific steps are as follows: 3.54 g of acetylcholine and 3.65 g of acrylamide were added to a glass bottle and magnetically stirred in an oil bath at 100°C for 2 hours to prepare a polymerizable low eutectic solvent.
[0031] S2: Phytic acid, hollow polyaniline microspheres, graphene oxide, a photoinitiator, and a crosslinker are added to the polymerizable eutectic solvent prepared in S1 and magnetically stirred to obtain a uniform precursor solution. The specific steps are as follows: 6 g of the polymerizable eutectic solvent prepared in S1 was added to 1.2 g of phytic acid, 60 mg of hollow polyaniline microspheres, 180 mg of graphene oxide, 60 mg of photoinitiator 2959, and 12 mg of polyethylene glycol diacrylate in sequence, and magnetic stirring was performed to obtain a uniformly mixed precursor solution. S3: A 10*10 cm glass sheet and a 2 mm thick silicone gasket were selected to form a mold. The precursor solution prepared in S2 was injected into the mold and irradiated with ultraviolet light for 2 h to polymerize it to obtain a eutectic gel. Before the S3 precursor solution is injected into the mold, the bubbles in the precursor solution are first removed by ultrasonication and then injected into the mold.
[0032] S4: The eutectic gel prepared in S3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor that can be used for hand motion recognition.
[0033] Example 5 This embodiment provides a method for preparing a dual-modal eutectic gel sensor, using the dual-modal eutectic gel sensor for hand motion recognition provided in Example 1, such as Figure 1-2 As shown, the following steps are included: S1: Preparation of a deep eutectic solvent: heating and mixing a hydrogen bond acceptor and a polymerizable hydrogen bond donor in a molar ratio of 1:2 to prepare a polymerizable deep eutectic solvent. The specific steps are as follows: 1.97 g of betaine and 2.03 g of acrylic acid were added to a glass bottle and magnetically stirred in an 80°C oil bath for 2 hours to prepare a polymerizable low eutectic solvent.
[0034] S2: Phytic acid, hollow polyaniline microspheres, graphene oxide, a photoinitiator, and a crosslinker are added to the polymerizable eutectic solvent prepared in S1 and magnetically stirred to obtain a uniform precursor solution. The specific steps are as follows: 4 g of the polymerizable eutectic solvent prepared in S1 was added to 0.4 g of phytic acid, 20 mg of hollow polyaniline microspheres, 40 mg of graphene oxide, 20 mg of photoinitiator 1173, and 1.8 μL of polyethylene glycol diacrylate in sequence, and magnetic stirring was performed to obtain a uniformly mixed precursor solution. S3: A specific 10*10 cm glass sheet and a 1.5 mm thick silicone gasket were selected to form a mold, and the precursor solution prepared in S2 was injected into the mold. The solution was then irradiated with ultraviolet light for 1 h to polymerize the solution and obtain a eutectic gel. S4: The eutectic gel prepared in S3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor that can be used for hand motion recognition.
[0035] Example 6 This embodiment provides a method for preparing a dual-modal eutectic gel sensor, using the dual-modal eutectic gel sensor for hand motion recognition provided in Example 1, such as Figure 1-2 As shown, the following steps are included: S1: Preparation of a deep eutectic solvent: heating and mixing a hydrogen bond acceptor and a polymerizable hydrogen bond donor in a molar ratio of 1:2 to prepare a polymerizable deep eutectic solvent. The specific steps are as follows: 5.91 g of choline chloride and 6.09 g of acrylic acid were added to a glass bottle and magnetically stirred in an 80°C oil bath for 2 hours to prepare a polymerizable low eutectic solvent.
[0036] S2: Phytic acid, hollow polyaniline microspheres, graphene oxide, a photoinitiator, and a crosslinker are added to the polymerizable eutectic solvent prepared in S1 and magnetically stirred to obtain a uniform precursor solution. The specific steps are as follows: 6 g of the polymerizable eutectic solvent prepared in S1 was added to 1.2 g of phytic acid, 15 mg of hollow polyaniline microspheres, 54 mg of graphene oxide, 40 mg of photoinitiator 2959, and 6 mg of N,N-methylenebisacrylamide in sequence, and magnetic stirring was performed to obtain a uniformly mixed precursor solution. S3: A specific 10*10 cm glass sheet and a 1 mm thick silicone gasket were selected to form a mold, and the precursor solution prepared in S2 was injected into the mold. The solution was then irradiated with ultraviolet light for 1.5 h to polymerize the solution and obtain a eutectic gel. S4: The eutectic gel prepared in S3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor that can be used for hand motion recognition.
[0037] Comparative Example 1 This comparative example provides a eutectic gel sensor containing no hollow polyaniline microspheres and graphene oxide and a preparation method thereof, comprising the following steps: Step 1: Preparation of a polymerizable low eutectic solvent: 1.97 g of choline chloride and 2.03 g of acrylic acid were added to a glass bottle and magnetically stirred in an 80°C oil bath for 2 hours to prepare a polymerizable low eutectic solvent; Step 2: Preparation of a precursor solution: Take 4 g of the polymerizable low eutectic solvent prepared in step 1, add 0.6 g of phytic acid, 40 mg of a photoinitiator 2959, and 7.2 μL of polyethylene glycol diacrylate to the polymerizable low eutectic solvent in sequence, and stir magnetically to obtain a uniformly mixed precursor solution; Step 3: Preparation of eutectic gel: A specific 10*10 cm glass sheet and a 1.5 mm thick silicone gasket were selected to form a mold. The precursor solution prepared in step 2 was injected into the mold and irradiated with ultraviolet light for 60 min to polymerize it to obtain a eutectic gel. Step 4: Preparation of eutectic gel sensor: The eutectic gel prepared in step 3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor that can be used for hand motion recognition.
[0038] Comparative Example 2 This comparative example provides a eutectic gel sensor containing no hollow polyaniline microspheres and graphene oxide and a preparation method thereof, comprising the following steps: Step 1: Preparation of a polymerizable low eutectic solvent: 1.97 g of choline chloride and 2.03 g of acrylic acid were added to a glass bottle and magnetically stirred in an 80°C oil bath for 2 hours to prepare a polymerizable low eutectic solvent; Step 2: Preparation of a precursor solution: Take 4 g of the polymerizable low eutectic solvent prepared in step 1, add 0.6 g of phytic acid, 40 mg of hollow polyaniline microspheres, 40 mg of photoinitiator 2959, and 7.2 μL of polyethylene glycol diacrylate to the polymerizable low eutectic solvent in sequence, and stir magnetically to obtain a uniformly mixed precursor solution; Step 3: Preparation of eutectic gel: A specific 10*10 cm glass sheet and a 1.5 mm thick silicone gasket were selected to form a mold. The precursor solution prepared in step 2 was injected into the mold and irradiated with ultraviolet light for 60 min to polymerize it to obtain a eutectic gel. Step 4: Preparation of eutectic gel sensor: The eutectic gel prepared in step 3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor that can be used for hand motion recognition.
[0039] Comparative Example 3 This comparative example provides a eutectic gel sensor containing no hollow polyaniline microspheres and graphene oxide and a preparation method thereof, comprising the following steps: Step 1: Preparation of a polymerizable low eutectic solvent: 1.97 g of choline chloride and 2.03 g of acrylic acid were added to a glass bottle and magnetically stirred in an 80°C oil bath for 2 hours to prepare a polymerizable low eutectic solvent; Step 2: Preparation of a precursor solution: Take 4 g of the polymerizable low eutectic solvent prepared in step 1, add 0.6 g of phytic acid, 40 mg of graphene oxide, 40 mg of photoinitiator 2959, and 7.2 μL of polyethylene glycol diacrylate to the polymerizable low eutectic solvent in sequence, and stir magnetically to obtain a uniformly mixed precursor solution; Step 3: Preparation of eutectic gel: A specific 10*10 cm glass sheet and a 1.5 mm thick silicone gasket were selected to form a mold. The precursor solution prepared in step 2 was injected into the mold and irradiated with ultraviolet light for 60 min to polymerize it to obtain a eutectic gel. Step 4: Preparation of eutectic gel sensor: The eutectic gel prepared in step 3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor that can be used for hand motion recognition.
[0040] The eutectic gels prepared in the embodiments of the present invention and the comparative examples were subjected to performance tests. The specific methods were as follows: a universal tensile testing machine was used to determine the mechanical properties and self-healing properties, a four-probe tester was used to test the electrical conductivity of the eutectic gel, and a digital source meter was used to detect the sensing and sensitivity of the eutectic gel.
[0041] (1) Mechanical properties test The eutectic gels prepared in Example 2 and Comparative Example 1 were placed in a tensile universal testing machine and the tensile rate was set to 100 mm / min. The tensile stress-strain curves were measured as follows: Figure 3 As shown in the figure, the addition of hollow polyaniline microspheres and graphene oxide increases the strength of the eutectic gel by more than four times, indicating that the eutectic gel prepared in this way has high strength.
[0042] (2) Conductivity test The samples prepared in Example 2 and Comparative Examples 1, 2, and 3 were cut into circles with a diameter of 2 cm and placed in a four-probe tester. One sample was measured five times. The conductivity data were as follows: Figure 4 As shown in the figure, the eutectic gel with both hollow polyaniline microspheres and graphene oxide exhibits high electrical conductivity compared to the eutectic gel without hollow polyaniline microspheres and graphene oxide or the eutectic gel with only one of them added.
[0043] (3) Sensing performance test The sample of Example 2 was made into a 4 cm*1 cm strip and clamped on a universal stretching machine. Wires were connected to both ends of the eutectic gel and connected to a digital source meter to test the strain sensing sensitivity. Figure 5The strain sensor's GF values are 1.25 and 9.7 in the ranges of 0–150% and 150–600%, respectively. These results demonstrate that the sensing network composed of hollow polyaniline microspheres and graphene oxide has high strain sensitivity and a wide detection range (0–600%), exceeding the sensitivity of most eutectic gel sensors.
[0044] The sample of Example 2 was made into a 2 cm*2 cm square, and wires were connected to the upper and lower ends of the eutectic gel and connected to a digital source meter to test the pressure sensing sensitivity. Figure 6 The pressure sensor has a -2.04 kPa range in the 0-50 kPa range. -1 The sensor has high sensitivity and an ultra-wide pressure detection range (0-100 kPa), which exceeds the monitoring range of most eutectic gel sensors.
[0045] The sample of Example 2 is made into five strain sensing units (S1 to S5), which are attached to each finger joint to monitor the bending movement of the finger; the sample of Example 1 is made into two pressure sensing units (P1, P2), which are integrated on the thumb and index finger to monitor the pressure of the fingertips in contact with objects. Figure 2 shown.
[0046] The five strain sensor units S1 to S5 can capture the dynamic gesture of "thank you", which requires bending four fingers and then bending the thumb twice in succession. Figure 7 As shown in Figure 3, when the finger is bent into place, the resistance of the strain sensors (S2 ~ S5) increases rapidly, and the sensor (S1) located on the thumb records two obvious resistance peaks, corresponding to two finger bendings.
[0047] The sensor array in the grasping system composed of S1, S2, P1, and P2 exhibits synchronized strain-pressure signals. In the static state, all ΔR / R0 values remain at the baseline level (ΔR / R0 = 0). During grasping, finger bending first triggers an increase in the resistance of S1 and S2. Subsequently, when the object is grasped, the pressure on P1 and P2 causes a decrease in resistance. After grasping the object from the table and holding it for 10 seconds, all signals stabilize. After the object is placed back on the table, Figure 8 As shown, all sensing signals quickly returned to baseline levels. These experiments validated the unique capabilities of the eutectic gel in synergistic strain-pressure sensing, enabling precise recognition of hand movements. The system's rapid response and multi-parameter compatibility (strain and pressure) make it a transformative tool for human-machine interfaces, with potential future applications in prosthetic control, rehabilitation robotics, and other fields.
[0048] Compared with traditional single-mode flexible sensors, the preparation method of the dual-modal eutectic gel sensor provided by the present invention can prepare a hand motion recognition system that can synchronously monitor strain and pressure signals, and can accurately recognize sign language and hand grasping movements.
[0049] In addition, the present invention provides a method for preparing a eutectic gel sensor, wherein the precursor liquid uses choline chloride-acrylic acid polymerizable low eutectic solvent, phytic acid, hollow polyaniline microspheres, graphene oxide, a photoinitiator, and a cross-linking agent as reaction raw materials, which can form a nanofiller-reinforced eutectic gel. Compared with conventionally prepared eutectic gels, the gel sensor of the present invention has the advantages of high strength, excellent self-repair efficiency, high conductivity, good biocompatibility, high sensitivity, etc., and has a larger strain and pressure response range. Compared with hydrogels, the gel provided by the present invention has excellent environmental stability and will not absorb water and swell to affect the shape of the polymer network when placed in the air for a long time. Compared with the toxic or environmentally harmful monomers used in ionic liquids or other gel materials, the monomers used in the gel sensor provided by the present invention are non-toxic, safer, and more environmentally friendly.
[0050] Compared to eutectic gels without hollow polyaniline microspheres and graphene oxide, eutectic gels incorporating hollow polyaniline microspheres and graphene oxide exhibit higher strength and conductivity sensitivity. The introduction of graphene oxide into the electronically conductive network of hollow polyaniline microspheres overcomes the limitations of individual fillers through the rational combination of conductive materials of varying dimensions and produces excellent conductive synergy. Compared to eutectic gels containing only a single conductive filler (i.e., hollow polyaniline microspheres or graphene oxide), the eutectic gels incorporating hollow polyaniline microspheres and graphene oxide exhibit significantly improved conductivity. The addition of a small amount of hollow polyaniline microspheres and graphene oxide nanomaterials to the three-dimensional polymer system effectively enhances hydrogen bonding interactions between polymer segments, thereby improving the overall mechanical properties of the material. The fracture strength of the eutectic gel increased significantly from 0.19 MPa to 0.88 MPa, a 4.6-fold increase, while maintaining an elongation at break exceeding 1000%, a property sufficient to meet diverse application requirements.
Claims
1. A dual-modal eutectic gel sensor for hand motion recognition, characterized in that: The preparation method comprises the following components in parts by mass: 2-6 g of a polymerizable low eutectic solvent, 0.1 g-1.2 g of phytic acid, 5 mg-60 mg of hollow polyaniline microspheres, 20 mg-180 mg of graphene oxide, 20 mg-60 mg of a photoinitiator, and 4 mg-12 mg of a crosslinker.
2. The dual-modal eutectic gel sensor for hand motion recognition according to claim 1, characterized in that: The polymerizable deep eutectic solvent consists of a hydrogen bond acceptor and a polymerizable hydrogen bond donor; The hydrogen bond acceptor is any one of tetramethylammonium chloride, acetylcholine, betaine or choline chloride; The polymerizable hydrogen bond donor is any one of acrylic acid, itaconic acid or acrylamide.
3. The dual-modal eutectic gel sensor for hand motion recognition according to claim 1, characterized in that: The photoinitiator is photoinitiator 1173 or photoinitiator 2959.
4. The dual-modal eutectic gel sensor for hand motion recognition according to claim 1, characterized in that: The cross-linking agent is polyethylene glycol diacrylate or N,N-methylenebisacrylamide.
5. The dual-modal eutectic gel sensor for hand motion recognition according to any one of claims 1 to 4, characterized in that: The specific steps are as follows: S1: Preparation of polymerizable deep eutectic solvent; S2: adding phytic acid, hollow polyaniline microspheres, graphene oxide, photoinitiator and crosslinker into the polymerizable eutectic solvent prepared in S1 and magnetically stirring to obtain a uniform precursor solution; S3: A mold is made using glass and silicone gaskets, and the precursor solution prepared in S2 is injected into the mold and polymerized using ultraviolet light to obtain a eutectic gel; S4: The eutectic gel prepared in S3 is used as a sensing element and pasted on different parts of the hand to obtain a dual-modal flexible sensor for hand motion recognition.
6. The method for preparing a dual-modal eutectic gel sensor for hand motion recognition according to claim 5, characterized in that: The specific steps for preparing the polymerizable low eutectic solvent described in S1 are: heating and mixing the hydrogen bond acceptor and the polymerizable hydrogen bond donor in a molar ratio of 1:2 to prepare the polymerizable low eutectic solvent; the heating temperature is 80-100°C, and the mixing time is 1-3 hours.
7. The method for preparing a dual-modal eutectic gel sensor for hand motion recognition according to claim 5, characterized in that: The particle size of the hollow polyaniline microspheres in S2 is 1.1 μm, and the size of the graphene oxide is 5-10 μm.
8. The method for preparing a dual-modal eutectic gel sensor for hand motion recognition according to claim 5, characterized in that: The thickness of the silicone gasket in S3 is any one of 1 mm, 1.5 mm or 2 mm.
9. The method for preparing a dual-modal eutectic gel sensor for hand motion recognition according to claim 5, characterized in that: The ultraviolet light irradiation duration in S3 is 1-2 hours.