High-resilience squid gill-imitated artificial muscle and preparation method thereof

Abstract

The invention discloses a high-resilience squid gill imitating artificial muscle and a preparation method thereof, and belongs to the technical field of artificial muscles, the high-resilience squid gill imitating artificial muscle comprises a multi-gap electric braking membrane and an electrode membrane which are distributed at intervals, the multi-gap electric braking membrane and the electrode membrane are bonded through hydrogel to form artificial muscle slice layers, and the artificial muscle slice layers are spliced and assembled through conductive adhesive to form a squid gill top end structure. The multi-gap electric brake membrane is prepared by cross-linking a sodium metaaluminate solution and a polyacrylamide solution and then performing a roller scraper drying method. The electrode film is prepared from composite gel and carbon quantum dots; the preparation method of the hydrogel comprises the following steps: adding distilled water into a dry beaker, adding polyacrylamide, and stirring in a magnetic stirrer to obtain the hydrogel. The preparation method is relatively good in flexibility, excellent in tensile property and low in cost, and plays a more important role in the field of artificial muscles.

Description

Technical Field

[0001] The present application relates to the technical field of artificial muscles, and in particular to an artificial muscle with high resilience and imitating squid gills and a preparation method thereof. Background Art

[0002] Artificial muscle refers to a flexible material or device that does not require mechanical devices but is driven by electric fields or chemicals and performs work externally. Artificial muscles play an important role in bionics, medical devices, aerospace, and military weapons. Traditional artificial muscles have made some achievements in these fields, but the flexibility, stretch resistance, and self-healing properties of traditional artificial muscles are insufficient, which limits the development of the field of artificial muscles.

[0003] Squids are soft-bodied marine animals with mantles and no backbones. Squid gills are important organs for their breathing, and the entire gill swings periodically about once every 7-8 seconds. Currently, there are not many studies on squid gills, so it is necessary to find a method to control the flexibility, force and stretchability of high-rebound squid gill artificial muscles. Summary of the invention

[0004] The invention aims to provide a high-resilience artificial muscle imitating squid gills, which has a simple preparation method, low price, high production quality and high fatigue life. At the same time, the invention provides the optimized polyacrylamide concentration, the dosage of sodium aluminate solution, the compounding ratio of carrageenan and konjac gum, the dosage of water-soluble carbon quantum dots and process preparation parameters related to the preparation method, so as to obtain a bionic artificial muscle with high strain, good softness, light weight and stretch resistance.

[0005] To achieve the above-mentioned purpose, the present invention provides a high-rebound artificial muscle imitating squid gills, comprising a multi-gap electric brake membrane and an electrode membrane distributed at intervals, which are bonded into artificial muscle layers by hydrogel, and the artificial muscle layers are spliced ​​and assembled into the top structure of the squid gills by conductive glue.

[0006] Preferably, the multi-void electric brake membrane is prepared by cross-linking a sodium aluminate solution and a polyacrylamide solution and then drying by a roller scraper method; the electrode membrane is prepared from a composite gel and carbon quantum dots; the hydrogel is prepared by adding distilled water and polyacrylamide into a dry beaker, and stirring in a magnetic stirrer to obtain a hydrogel.

[0007] The present application provides a method for preparing the above-mentioned high-resilience squid gill-mimicking artificial muscle, comprising the following steps:

[0008] Step 1: Turn on the magnetic stirrer, put a beaker containing distilled water into it, then add polyacrylamide into the beaker to dissolve it, add sodium aluminate solution after dissolution, heat in a water bath for 20 minutes, then add glycerol, mix well to obtain an electric brake solution;

[0009] Step 2: Pour the electric brake solution obtained in step 1 into a culture dish, and then pour the solution from the culture dish into the material trough of a small drum scraper dryer. Set the temperature of the drum to 55°C. When the drum rotates, the solution passes through the lower material trough, and the heat is transported to the inner wall of the drum through the pipeline, and then conducted to the outer wall of the drum, indirectly heating the film, evaporating the moisture in the film, and the film adheres to the surface of the drum. After evaporation, the film on the surface of the drum is scraped off the drum by a scraper, and the film is transferred to the screw conveyor under the scraper, and the multi-gap electro-actuated film product is obtained through the screw conveyor;

[0010] Step 3: Turn on the magnetic stirrer, add the composite gel and water-soluble carbon quantum dots into a beaker and add glycerol, continue stirring and let stand, thereby preparing an electrode membrane solution;

[0011] Step 4: Place the mold on the work surface and position it, then open the mold and spray a layer of parting agent on its inner and outer surfaces. Next, pour the electrode membrane solution obtained in step 3 into the mold and perform investment-like centrifugal casting. After the casting process is completed, let it stand and carefully remove the electrode membrane from the mold with a bamboo knife to obtain the desired electrode membrane.

[0012] Preferably, in step 3, the composite gel comprises carrageenan and konjac gum in a mass ratio of 5:2; first, konjac gum and carrageenan are added to a beaker containing distilled water and heated in a water bath at 50° C. to obtain the composite gel.

[0013] Preferably, in step 1, the stirring speed of the magnetic stirrer is set to 50% and the stirring temperature is 50°C.

[0014] Preferably, in step 3, the volume ratio of water-soluble carbon quantum dots to glycerol is 25:3.

[0015] Preferably, in step 4, the injection time of the injection molding machine is 1 hour, the injection pressure is 0.1 MPa, and the investment-like centrifugal casting temperature is 75°C.

[0016] Preferably, the release agent includes a sol agent or a fragrance water agent.

[0017] Therefore, the present application provides a high-resilience squid gill-mimicking artificial muscle and a preparation method thereof, which has the following beneficial effects:

[0018] (1) The use of sodium aluminate NaAlO2 cross-linked polyacrylamide to prepare the electro-actuated membrane solution can improve the stability of the multi-void electro-actuated membrane. NaAlO2 is a weak acid and strong base salt. After ionization and hydration in aqueous solution, the solution is alkaline and exists in the form of hydroxyl acid anions. Polyacrylamide is the most widely used variety of water-soluble polymers and is also a non-ionic derivative with good water solubility and chemical activity. When the pH value is 7-9, sodium aluminate will cross-link with the non-ionic derivative of polyacrylamide containing adjacent cis-carboxyl groups through coordination bonds and polar bonds with its carboxyl anions. This greatly increases the flexibility and fracture energy of the multi-void electro-actuated membrane, while also improving its chemical properties.

[0019] (2) Carrageenan with good viscosity and hydrophilicity and konjac gum with high flexibility are selected for compounding to increase the elasticity of the electrode membrane, and water-soluble carbon quantum dots with electrical conductivity and thermal conductivity properties are added. Subsequently, the distilled water in the gel electrode membrane is evaporated through a melt-molded centrifugal molding method to obtain an electrode membrane that imitates the artificial muscle of squid gills. The thermal conductivity, flexibility and tensile resistance of the membrane are excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a process flow chart of the anti-fatigue method of the high-resilience squid gill imitating artificial muscle.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the high-resilience squid gill imitating artificial muscle of the present invention.

[0022] Figure 3 It is a partial enlarged view of the multilayer structure of the high-resilience squid gill imitating artificial muscle of the present invention.

[0023] Figure 4 This is a diagram showing the internal structure of a multi-void electric actuation membrane inside a high-resilience squid gill-mimicking artificial muscle of the present invention;

[0024] Figure 5 This is a self-recovering structural diagram of the anti-fatigue performance of the high-resilience squid gill imitation artificial muscle of the present invention.

[0025] Figure 6 This is a microscopic structure diagram of the multi-void electro-actuated membrane inside the high-resilience squid gill-mimicking artificial muscle of the present invention;

[0026] Reference numerals

[0027] 1-electrode film, 2-electrically actuated film, 3-conductive glue. DETAILED DESCRIPTION

[0028] Example 1

[0029] A high-resilience artificial muscle imitating squid gills, such as Figure 1As shown, it includes three stages: preparing the electro-actuated membrane solution, that is, sodium aluminate (NaAlO2) solution cross-linking polyacrylamide solution, preparing the multi-void electro-actuated membrane (drum scraper drying method), so as to construct the electro-actuated membrane 2 with a multi-void structure similar to a "ball net", as shown in FIG. Figure 4 As shown; a composite gel of carrageenan and konjac gum is used, and water-soluble carbon quantum dots are added to prepare an electrode film 1 with good conductivity (similar to the investment mold centrifugal casting method), which is spaced apart from the electro-actuated membrane 2 and bonded together through the hydrogel to obtain an artificial muscle sheet, such as Figure 3 As shown; the above artificial muscle sheet is assembled into a three-dimensional structure similar to the shape of "squid gill top" by conductive glue 3, and its conductivity and tensile strength are improved, such as Figure 2 At the same time, the whole process is simple to operate, low in cost and can be applied in many fields, thereby producing artificial muscles imitating squid gills with strong resilience, good flexibility, light weight and stretch resistance.

[0030] The preparation method of artificial muscle is as follows:

[0031] Step 1. Turn on the magnetic stirrer, set the stirring speed to 50% and 50°C, put a beaker containing 60ml of distilled water into it, and use a precision electronic analytical balance to measure 1.8g of 30g / L polyacrylamide solution. After it is completely dissolved, slowly pour in 8ml of 2.5g / L sodium aluminate NaAlO2 solution and mix the two evenly. Keep heating in a water bath for 20min, then add a rubber dropper (3ml) of glycerol and mix evenly to obtain the electro-actuated liquid.

[0032] Step 2: Place the electric brake solution obtained in step 1 into The solution is then poured from the culture dish into the trough of the small drum scraper dryer. The temperature of the drum is set to 55°C. When the drum rotates, the solution passes through the lower trough, and the heat is transported to the inner wall of the drum through the pipeline, and then conducted to the outer wall of the drum, indirectly heating the film, so that the moisture in the film evaporates for 15 minutes, and the film adheres to the surface of the drum. After evaporation, the film on the surface of the drum is scraped off the drum by a scraper, and the film is transferred to the screw conveyor under the scraper. The multi-void electro-actuated film is obtained through the screw conveyor; during the operation of the drum scraper dryer, the film-forming state of the electro-actuated film should be observed in time, and the water content in the film should not be too much, nor should the film be too dry, in order to maintain the good tensile strength of the multi-void electro-actuated film.

[0033] Step 3: Prepare an electrode film with good conductivity by using a similar investment casting method: Figure 1 and Figure 3, turn on the magnetic stirrer, add 1g of carrageenan and 0.4g of konjac gum respectively into a beaker containing 40ml of distilled water. After heating and stirring in a water bath for 30min, add 25ml of water-soluble carbon quantum dots and 3ml of glycerol, continue stirring for 15min and then let stand to prepare an electrode membrane solution.

[0034] Step 4: Place the finished mold on the work surface of the injection molding machine for positioning, open the mold, and spray a layer of sol ethanol on the inner and outer surfaces of the mold to prevent the mold temperature from being too high and damaging the physical properties of the membrane. After all the work is ready, set the drying parameters: injection pressure is 0.1MPa, temperature is 75℃, and time is set to 1h, then pour the electrode membrane solution obtained in step 3 into the mold for quasi-investment centrifugal casting. After the casting process is completed, let it stand and carefully remove the electrode membrane from the mold with a bamboo knife to obtain the desired electrode membrane.

[0035] Take a beaker in a drying oven, add 40 ml of distilled water and 1.5 g of polyacrylamide, and stir in a magnetic stirrer for 15 minutes to obtain a hydrogel. The electrode membrane and the multi-voided electro-actuated membrane prepared above are interlaced and bonded with the hydrogel to obtain an artificial muscle sheet. Its thermal conductivity, flexibility and tensile properties are shown in Table 1.

[0036] Table 1 Performance data of Example 1

[0037] project Thermal conductivity (W / (m·k)) Flexibility(cm) Stretchability (%) Electrode membrane 0.5 7.76 240

[0038] The artificial muscle sheets are assembled into a three-dimensional structure similar to the "squid gill tip" by conductive glue. Figure 1 and Figure 2 , use conductive glue to splice the artificial muscle sheets layer by layer, and finally splice them into a structure shaped like the "top of the squid gills". This structure has good flexibility and high resilience.

[0039] Specific working principle:

[0040] The fatigue resistance of artificial muscles imitating squid gills refers to the ability of a material to maintain its original mechanical properties after multiple loadings. Generally speaking, high-rebound artificial muscles have better fatigue resistance. However, the performance of the artificial muscles described in this article will decrease rapidly in the continuous cyclic stretching experiment, but it can recover to its original state in a short time, which is called automatic recovery, so it also shows anti-fatigue properties. Moreover, the artificial muscles imitating squid gills are a "soft material" with high ionic conductivity and similar to biological tissues. When the longitudinal elongation at break reaches 200%, the maximum tensile stress is 0.1MPa; when stretched to an elongation of 150%, the self-recovery rate after 30 minutes can reach 90%, and it has since shown high fatigue resistance.

[0041] Comparative Example 1

[0042] Step 1. Turn on the magnetic stirrer, set the stirring speed to 50% and 50°C, put a beaker containing 60ml of distilled water into it, and use a precision electronic analytical balance to measure 1.8g of 30g / L polyacrylamide solution. After it is completely dissolved, slowly pour in 8ml of 2.5g / L sodium aluminate NaAlO2 solution and mix the two evenly. Keep heating in a water bath for 20min, then add a rubber dropper (3ml) of glycerol and mix evenly to obtain the electro-actuated liquid.

[0043] Step 2: Place the electric brake solution obtained in step 1 into The solution is then poured from the culture dish into the trough of the small drum scraper dryer. The temperature of the drum is set to 55°C. When the drum rotates, the solution passes through the lower trough, and the heat is transported to the inner wall of the drum through the pipeline, and then conducted to the outer wall of the drum, indirectly heating the film, so that the moisture in the film evaporates for 15 minutes, and the film adheres to the surface of the drum. After evaporation, the film on the surface of the drum is scraped off the drum by a scraper, and the film is transferred to the screw conveyor under the scraper. The multi-void electro-actuated film is obtained through the screw conveyor; during the operation of the drum scraper dryer, the film-forming state of the electro-actuated film should be observed in time, and the water content in the film should not be too much, nor should the film be too dry, in order to maintain the good tensile strength of the multi-void electro-actuated film.

[0044] Step 3: Prepare an electrode film with good conductivity by using a similar investment casting method: Figure 1 and Figure 3 , turn on the magnetic stirrer, add 1g of gelatin and 0.4g of konjac gum respectively into a beaker containing 40ml of distilled water. After heating and stirring in a water bath for 30min, add 25ml of water-soluble carbon quantum dots and 3ml of glycerol, continue stirring for 15min and let stand to prepare an electrode membrane solution.

[0045] Step 4: Place the finished mold on the work surface of the injection molding machine for positioning, open the mold, and spray a layer of sol ethanol on the inner and outer surfaces of the mold to prevent the mold temperature from being too high and damaging the physical properties of the membrane. After all the work is ready, set the drying parameters: injection pressure is 0.1MPa, temperature is 75℃, and time is set to 1h, then pour the electrode membrane solution obtained in step 3 into the mold for quasi-investment centrifugal casting. After the casting process is completed, let it stand and carefully remove the electrode membrane from the mold with a bamboo knife to obtain the desired electrode membrane.

[0046] Take a beaker in a drying oven, add 40 ml of distilled water, and add 1.5 g of polyacrylamide, stir in a magnetic stirrer for 15 minutes to obtain a hydrogel. The electrode film and the multi-void electro-actuated film prepared above are interlaced and bonded with the hydrogel to obtain an artificial muscle sheet. The data obtained are shown in Table 2. It can be seen that the thermal conductivity of the electrode film obtained using gelatin is reduced to 0.4 W / (m·k), and the tensile performance is also reduced to 180%.

[0047] Table 2 Performance data of comparative example 1

[0048] project Thermal conductivity (W / (m·k)) Flexibility(cm) Stretchability (%) Electrode membrane 0.4 6.68 180

[0049] Comparative Example 2

[0050] In step 3 of this comparative example 2, xanthan gum is used instead of konjac gum to mix with carrageenan, and the remaining steps are the same as those in Example 1. The obtained data are shown in Table 3. It can be seen that the thermal conductivity of the electrode film formed by xanthan gum is similar to that of the mixture of carrageenan and konjac gum, but the flexibility and tensile properties have a downward trend. Taking all factors into consideration, the flexibility and tensile resistance of the electrode film obtained by mixing carrageenan and konjac gum are more advantageous.

[0051] Table 3 Performance data of comparative example 2

[0052] project Thermal conductivity (W / (m·k)) Flexibility(cm) Stretchability (%) Electrode membrane 0.48 7.23 220

[0053] Comparative Example 3

[0054] In step 3 of this comparative example 3, the mass ratio of carrageenan and konjac gum is 4:2, magnetic stirring machine is turned on, and the mass of carrageenan and konjac gum is respectively 0.8g and 0.4g and added to the beaker containing 40ml distilled water.After heating in water bath and stirring for 30min, 25ml water-soluble carbon quantum dots are added and 3ml glycerol is added, and standing after continuing to stir 15min evenly, thus prepare electrode film solution. All the other steps are the same as Example 1, and the data obtained are as shown in Table 4, and it can be found that when the amount of carrageenan is changed, the thermal conductivity, flexibility, stretchability of the film are not good when the mass ratio of carrageenan and konjac gum is 5:2.

[0055] Table 4 Performance data of comparative example 3

[0056] project Thermal conductivity (W / (m·k)) Flexibility(cm) Stretchability (%) Electrode membrane 0.47 7.34 210

[0057] Comparative Example 4

[0058] In step 3 of this comparative example 4, the mass ratio of carrageenan and konjac glucomannan is 6:2, magnetic stirring machine is turned on, and the mass of carrageenan and konjac glucomannan is respectively 1.2g and 0.4g and is added in the beaker containing the distilled water of 40ml.After heating in water bath and stirring for 30min, 25ml water-soluble carbon quantum dots are added and 3ml glycerol is added, and standing after continuing to stir for 15min is evenly obtained, so as to obtain electrode film solution. All the other steps are the same as Example 1, and the data obtained are as shown in Table 5, and when the mass ratio of carrageenan and konjac glucomannan is 6:2, thermal conductivity rises to some extent, but the tensile property can not reach the tensile length when 5:2, so it is more convincing to select the mass ratio of carrageenan and konjac glucomannan to be 5:2.

[0059] Table 5 Performance data of comparative example 4

[0060] project Thermal conductivity (W / (m·k)) Flexibility(cm) Stretchability (%) Electrode membrane 0.52 7.44 215

[0061] Therefore, the present application provides a high-resilience artificial muscle imitating squid gills, wherein sodium metaaluminate solution NaAlO2 cross-linked polyacrylamide is used to prepare an electro-actuated liquid, and an electro-actuated membrane is prepared by a roller scraper drying method. Carrageenan and konjac gum are compounded, and then water-soluble carbon quantum dots are added, and an electrode membrane is prepared by a melt-cast centrifugal method and then assembled into an artificial muscle device. The squid gill artificial muscle is simple and easy to understand, has strong adaptability, and can be widely used.

[0062] In the description of this specification, the description with reference to the terms "an experimental example", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the experimental example or example are included in at least one experimental example or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same experimental example or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more experimental examples or examples in a suitable manner.

[0063] Finally, it should be noted that the above experimental examples are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred experimental examples, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A high-resilience artificial muscle imitating squid gills, characterized in that: It includes multi-gap electric brake membranes and electrode membranes that are distributed at intervals, which are bonded into artificial muscle sheets through hydrogels, and the artificial muscle sheets are spliced ​​and assembled into the top structure of the squid gills through conductive glue.

2. The high-resilience artificial muscle imitating squid gills according to claim 1, characterized in that: The multi-void electric brake membrane is prepared by cross-linking a sodium aluminate solution and a polyacrylamide solution and then drying by a roller scraper method; the electrode membrane is prepared from a composite gel and carbon quantum dots; the preparation method of the hydrogel is: adding distilled water and polyacrylamide into a dry beaker, and stirring in a magnetic stirrer to obtain the hydrogel.

3. The method for preparing a high-resilience artificial muscle imitating squid gills according to any one of claims 1-2, characterized in that: The following steps are involved: Step 1: Turn on the magnetic stirrer, put a beaker containing distilled water into it, then add polyacrylamide into the beaker to dissolve it, add sodium aluminate solution after dissolution, heat in a water bath for 20 minutes, then add glycerol, mix well to obtain an electric brake solution; Step 2: Pour the electric brake solution obtained in step 1 into a culture dish, and then pour the solution from the culture dish into the material trough of a small drum scraper dryer. Set the temperature of the drum to 55°C. When the drum rotates, the solution passes through the lower material trough, and the heat is transported to the inner wall of the drum through the pipeline, and then conducted to the outer wall of the drum, indirectly heating the film, evaporating the moisture in the film, and the film adheres to the surface of the drum. After evaporation, the film on the surface of the drum is scraped off the drum by a scraper, and the film is transferred to the screw conveyor under the scraper, and the multi-gap electro-actuated film product is obtained through the screw conveyor; Step 3: Turn on the magnetic stirrer, add the composite gel and water-soluble carbon quantum dots into a beaker and add glycerol, continue stirring and let stand, thereby preparing an electrode membrane solution; Step 4: Place the mold on the work surface and position it, then open the mold and spray a layer of parting agent on its inner and outer surfaces. Next, pour the electrode membrane solution obtained in step 3 into the mold and perform investment-like centrifugal casting. After the casting process is completed, let it stand and carefully remove the electrode membrane from the mold with a bamboo knife to obtain the desired electrode membrane.

4. The high-resilience artificial muscle imitating squid gills according to claim 3, characterized in that: In step 3, the composite gel comprises carrageenan and konjac gum in a mass ratio of 5:2; first, konjac gum and carrageenan are added to a beaker containing distilled water and heated in a water bath at 50° C. to obtain the composite gel.

5. The high-resilience artificial muscle imitating squid gills according to claim 3, characterized in that: In step 1, the stirring speed of the magnetic stirrer is set to 50% and the stirring temperature is 50°C.

6. The high-resilience artificial muscle imitating squid gills according to claim 3, characterized in that: In step 3, the volume ratio of water-soluble carbon quantum dots to glycerol is 25:

3.

7. The high-resilience artificial muscle imitating squid gills according to claim 3, characterized in that: In step 4, the injection time of the injection molding machine is 1 hour, the injection pressure is 0.1 MPa, and the investment-like centrifugal casting temperature is 75°C.

8. The high-resilience artificial muscle imitating squid gills according to claim 3, characterized in that: The release agent includes a sol agent or a fragrance water agent.

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