A photo / thermal dual-responsive hydrogel actuator and a preparation method thereof
By combining modified carbon nanotubes and nanocellulose with poly(N-isopropylacrylamide) hydrogel, a photo/thermal dual-response hydrogel actuator was prepared, which solved the problems of insufficient interfacial adhesion and mechanical properties, achieved self-sensing and excellent temperature response, and enhanced the overall performance of the hydrogel.
Patent Information
- Application Number
- CN202310589683.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-24
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2043-05-24
AI Technical Summary
Existing polymer hydrogel actuators suffer from poor interfacial adhesion, insufficient mechanical properties, and an inability to sense their own movement.
By combining dopamine-modified carbon nanotubes and nanocellulose with poly(N-isopropylacrylamide) hydrogel, a photo/thermal dual-response hydrogel actuator was prepared, which enhanced interfacial adhesion and mechanical strength, and introduced the conductivity of carbon nanotubes to achieve self-sensing function.
The prepared hydrogel actuator exhibits excellent interfacial adhesion, temperature responsiveness, near-infrared light responsiveness, and self-sensing function, significantly improving its mechanical properties.
Smart Images
Figure CN116769208B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of polymer optoelectronic materials technology, and more specifically, relates to a photo / thermal dual-response hydrogel actuator and its preparation method. Background Technology
[0002] Smart responsive materials are materials whose microscopic molecular structure and conformation undergo reversible changes under the influence of external stimuli such as temperature, pressure, pH, and light, resulting in corresponding changes in certain macroscopic properties. Polymer hydrogel actuators, as an important type of smart material, can transform various external stimuli such as heat, pH, light, and electricity into controllable and reversible shape transformations. Poly(N-isopropylacrylamide) (PNIPAM), a typical stimulus-responsive hydrogel, is used in hydrogel actuators. However, the poor mechanical properties of PNIPAM hydrogels limit their application range. The poor interfacial adhesion of bilayer hydrogel actuators shortens their lifespan. Traditional hydrogel actuators cannot sense their own movement. Summary of the Invention
[0003] The purpose of this invention is to address the above-mentioned shortcomings by providing a photo / thermal dual-response hydrogel actuator and its preparation method. The prepared hydrogel actuator has excellent interfacial adhesion, temperature responsiveness, near-infrared light responsiveness, mechanical strength, and self-sensing function.
[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:
[0005] This invention provides a method for preparing a photo / thermal dual-response hydrogel actuator, comprising the following steps:
[0006] Modified carbon nanotubes were prepared using dopamine and carbon nanotubes as raw materials.
[0007] Nanocellulose suspension was prepared using bleached wood pulp fiber as raw material;
[0008] A nanocellulose suspension was prepared by mixing it with modified carbon nanotubes.
[0009] A poly(N-isopropylacrylamide) hydrogel precursor solution was prepared using N-isopropylacrylamide and nanocellulose / carbon nanotube composite suspension as raw materials.
[0010] Polyacrylamide hydrogels were prepared using acrylamide and nanocellulose suspensions as raw materials.
[0011] A photo / thermal dual-response hydrogel actuator based on polydopamine-coated carbon nanotubes was prepared by transferring a poly(N-isopropylacrylamide) hydrogel precursor onto the surface of a polyacrylamide hydrogel.
[0012] Preferably, the preparation of modified carbon nanotubes includes:
[0013] A buffer solution was prepared by dissolving tris(hydroxymethyl)aminomethane in deionized water.
[0014] Carbon nanotubes and dopamine are dissolved in a buffer solution and stirred for 24 hours; preferably, the mass content of carbon nanotubes is 50-150% of that of dopamine.
[0015] Modified carbon nanotubes were obtained by filtration, washing, and drying.
[0016] The preparation of the nanocellulose suspension includes:
[0017] TEMPO and NaBr were added to deionized water in sequence and stirred thoroughly. After TEMPO and NaBr were completely dissolved, bleached wood pulp fiber powder was added to the reaction system.
[0018] After stirring vigorously until the cellulose is evenly dispersed, add NaClO to the reaction system and control the pH of the reaction system at 9-11 by continuously adding NaOH solution.
[0019] After reacting for 5–7 hours, the mixture was filtered and washed with deionized water to obtain oxidized cellulose.
[0020] Oxidized cellulose is prepared into a slurry using deionized water, and then homogenized to form cellulose nanofibers, thus obtaining a nanocellulose suspension. Preferably, the concentration of nanocellulose in the nanocellulose suspension is 0.2-0.6 wt%.
[0021] Preferably, the preparation of the nanocellulose / carbon nanotube composite suspension includes:
[0022] Modified carbon nanotubes were added to the nanocellulose suspension and stirred at room temperature to form a uniform nanocellulose / carbon nanotube composite suspension.
[0023] Preferably, the amount of modified carbon nanotubes added to the nanocellulose / carbon nanotube composite suspension is 20-100 wt% of the solid content of nanocellulose.
[0024] Preferably, the preparation of the poly(N-isopropylacrylamide) hydrogel precursor solution includes:
[0025] N-Isopropylacrylamide and N,N-methylenebisacrylamide were dissolved in distilled water and stirred thoroughly to form a homogeneous N-isopropylacrylamide hydrogel solution.
[0026] The prepared nanocellulose / carbon nanotube suspension and photoinitiator Irgacure 2959 were added to the above mixed solution and stirred until a uniformly dispersed poly(N-isopropylacrylamide) hydrogel precursor solution was formed.
[0027] Preferably, in the above steps, the amount of N,N-methylenebisacrylamide and photoinitiator Irgacure 2959 added is 10% of N-isopropylacrylamide, and the solid content of nanocellulose in the nanocellulose / carbon nanotube suspension is 2%-6% of N-isopropylacrylamide.
[0028] Preferably, the preparation of the polyacrylamide hydrogel includes:
[0029] Acrylamide and N,N-methylenebisacrylamide were dissolved in distilled water and stirred thoroughly to form a homogeneous acrylamide solution;
[0030] Nanocellulose suspension and photoinitiator Irgacure 2959 were added to acrylamide solution and stirred to form a homogeneous polyacrylamide hydrogel precursor solution.
[0031] The polyacrylamide hydrogel precursor solution was transferred into a mold and irradiated with a UV lamp for 3-5 minutes to polymerize into a polyacrylamide hydrogel.
[0032] Preferably, in the above steps, the amount of N,N-methylenebisacrylamide added is 1% of acrylamide, the amount of photoinitiator Irgacure 2959 added is 0.5% of acrylamide, and the solid content of nanocellulose is 3% of acrylamide.
[0033] Preferably, the poly(N-isopropylacrylamide) hydrogel precursor is transferred to the upper surface of the polyacrylamide hydrogel and irradiated with a UV lamp for 1 to 3 minutes.
[0034] The present invention also provides a photo / thermal dual-response hydrogel actuator, which is prepared by the above-described preparation method.
[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0036] The present invention provides a photo / thermal dual-response hydrogel actuator and its preparation method. The prepared hydrogel actuator has excellent interfacial adhesion, temperature responsiveness, near-infrared light responsiveness, mechanical strength and self-sensing function.
[0037] This invention utilizes polydopamine-modified carbon nanotubes to enhance their photothermal conversion capabilities. The polydopamine in the poly(N-isopropylacrylamide) hydrogel layer enhances interfacial adhesion through hydrogen bonding with the polyacrylamide hydrogel layer. Since pure poly(N-isopropylacrylamide) hydrogels have poor mechanical properties, the addition of nanocellulose improves their mechanical properties. Because carbon nanotubes have poor dispersibility in water, the addition of nanocellulose assists in dispersing them. Simultaneous introduction of nanocellulose into both hydrogel layers enhances the interfacial adhesion between them. Due to the conductivity of carbon nanotubes, the prepared poly(N-isopropylacrylamide) hydrogel possesses self-sensing functionality. The interaction between polydopamine and nanocellulose in the poly(N-isopropylacrylamide) hydrogel layer also enhances the hydrogel's mechanical properties. Attached Figure Description
[0038] Figure 1 Tensile stress-strain curves of poly(N-isopropylacrylamide) hydrogels with different nanocellulose contents;
[0039] Figure 2 The graph shows the change in the bending angle of the hydrogel actuator over time at 50 degrees Celsius.
[0040] Figure 3 The graph shows the change in the bending angle of the hydrogel actuator over time at 10 degrees Celsius.
[0041] Figure 4 The graph shows the change in bending angle of the hydrogel actuator with temperature. Detailed Implementation
[0042] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings and specific examples.
[0043] Example 1
[0044] A photo / thermal dual-response hydrogel actuator based on polydopamine-coated carbon nanotubes is prepared by the following steps:
[0045] S1. Weigh 25g of tris(hydroxymethyl)aminomethane, dissolve it in 10mL of deionized water, and stir thoroughly using a magnetic stirrer.
[0046] Weigh 25g of carbon nanotubes and dissolve 25g of dopamine in a buffer solution, and stir for 6 hours;
[0047] The mixture was filtered, washed, and dried to obtain modified carbon nanotubes.
[0048] S2, weigh 0.01g of TEMPO and 0.1g of NaBr and add them to 100mL of deionized water. Stir the mixture thoroughly with a magnetic stirrer. After TEMPO and NaBr are completely dissolved, add 1g of crushed bleached wood pulp fiber powder to the reaction system.
[0049] After stirring vigorously until the cellulose is evenly dispersed, add 5g of NaClO to the system and control the pH of the reaction system at 9 by continuously adding 0.2mol / L NaOH solution.
[0050] After reacting for 5 hours, the oxidized cellulose was filtered and washed three times with deionized water to obtain oxidized cellulose.
[0051] Oxidized cellulose was prepared into a slurry of 1 mg / ml using deionized water. The oxidized cellulose was then exfoliated into cellulose nanofibers by sonication at 200W power for 4 minutes in an ice-water bath. The prepared cellulose nanofiber suspension was then refrigerated and stored for later use, thus preparing the TEMPO cellulose nanofiber suspension.
[0052] S3, add modified carbon nanotubes to the nanocellulose suspension. The amount of modified carbon nanotubes added is 20 wt% of the solid content of nanocellulose. Stir at room temperature for 2 h to form a uniform nanocellulose / carbon nanotube composite suspension.
[0053] S4, Dissolve 0.2g N-isopropylacrylamide and 0.02g N,N-methylenebisacrylamide in 5mL of distilled water and stir thoroughly to form a homogeneous N-isopropylacrylamide solution;
[0054] The prepared nanocellulose / carbon nanotube composite suspension and 0.02g of photoinitiator Irgacure 2959 were added to the above mixed solution and stirred until a well dispersed poly(N-isopropylacrylamide) hydrogel precursor solution was formed.
[0055] S5, Dissolve 1g of acrylamide and 0.01g of N,N-methylenebisacrylamide in 10ml of distilled water and stir thoroughly to form a homogeneous acrylamide solution;
[0056] Nanocellulose suspension and 0.005g photoinitiator Irgacure 2959 were added to acrylamide solution and stirred to form a homogeneous polyacrylamide hydrogel precursor solution.
[0057] The polyacrylamide hydrogel precursor solution was transferred into a silicone mold and placed under a UV lamp for 3 minutes to polymerize into a polyacrylamide hydrogel.
[0058] S6, the poly(N-isopropylacrylamide) hydrogel precursor was transferred to the upper layer of the polyacrylamide hydrogel and placed under a UV lamp for 1 minute.
[0059] Example 2
[0060] A photo / thermal dual-response hydrogel actuator based on polydopamine-coated carbon nanotubes is prepared by the following steps:
[0061] S1. Weigh 50g of tris(hydroxymethyl)aminomethane, dissolve it in 20mL of deionized water, and stir thoroughly using a magnetic stirrer.
[0062] Weigh 50g of carbon nanotubes and dissolve 50g of dopamine in a buffer solution, and stir for 12 hours;
[0063] The mixture was filtered, washed, and dried to obtain modified carbon nanotubes.
[0064] S2, weigh 0.02g of TEMPO and 0.2g of NaBr and add them to 200mL of deionized water. Stir the mixture thoroughly with a magnetic stirrer. After TEMPO and NaBr are completely dissolved, add 1.5g of crushed bleached wood pulp fiber powder to the reaction system.
[0065] After stirring vigorously until the cellulose is evenly dispersed, add 10g NaClO to the system and control the pH of the reaction system at 10 by continuously adding 0.3mol / L NaOH solution.
[0066] After reacting for 5 hours, the oxidized cellulose was filtered and washed three times with deionized water to obtain oxidized cellulose.
[0067] Oxidized cellulose was prepared into a slurry of 1.5 mg / ml using deionized water. The oxidized cellulose was then exfoliated into cellulose nanofibers by sonication at 300 W for 4 min in an ice-water bath. The prepared nanofiber suspension was then refrigerated and stored for later use, thus preparing the TEMPO nanocellulose suspension.
[0068] S3. Modified carbon nanotubes are added to the nanocellulose suspension. The amount of modified carbon nanotubes added is 50 wt% of the solid content of nanocellulose. Stir at room temperature for 3 h to form a uniform nanocellulose / carbon nanotube composite suspension.
[0069] S4, Dissolve 0.5g N-isopropylacrylamide and 0.05g N,N-methylenebisacrylamide in 10mL of distilled water and stir thoroughly to form a homogeneous N-isopropylacrylamide solution;
[0070] The prepared nanocellulose / carbon nanotube composite suspension and 0.05 g of photoinitiator Irgacure 2959 were added to the above mixed solution and stirred until a well dispersed poly(N-isopropylacrylamide) hydrogel precursor solution was formed.
[0071] S5, Dissolve 2g of acrylamide and 0.02g of N,N-methylenebisacrylamide in 15ml of distilled water and stir thoroughly to form a homogeneous acrylamide solution;
[0072] Nanocellulose suspension and 0.01g photoinitiator Irgacure 2959 were added to acrylamide solution and stirred to form a homogeneous polyacrylamide hydrogel precursor solution.
[0073] The polyacrylamide hydrogel precursor solution was transferred into a silicone mold and placed under a UV lamp for 3 minutes to polymerize into a polyacrylamide hydrogel.
[0074] S6, the poly(N-isopropylacrylamide) hydrogel precursor was transferred to the upper layer of the polyacrylamide hydrogel and placed under a UV lamp for 2 minutes.
[0075] Example 3
[0076] A photo / thermal dual-response hydrogel actuator based on polydopamine-coated carbon nanotubes is prepared by the following steps:
[0077] S1. Weigh 75g of tris(hydroxymethyl)aminomethane, dissolve it in 30mL of deionized water, and stir thoroughly using a magnetic stirrer.
[0078] Weigh out 75g of carbon nanotubes and dissolve 75g of dopamine in a buffer solution, and stir for 18 hours.
[0079] The mixture was filtered, washed, and dried to obtain modified carbon nanotubes.
[0080] S2, weigh 0.03g of TEMPO and 0.3g of NaBr and add them to 300mL of deionized water. Stir the mixture thoroughly with a magnetic stirrer. After TEMPO and NaBr are completely dissolved, add 2g of crushed bleached wood pulp fiber powder to the reaction system.
[0081] After stirring vigorously until the cellulose is evenly dispersed, add 15g of NaClO to the system and control the pH of the reaction system at 10 by continuously adding 0.3mol / L NaOH solution.
[0082] After reacting for 6 hours, the oxidized cellulose was filtered and washed four times with deionized water to obtain oxidized cellulose.
[0083] Oxidized cellulose was prepared into a slurry of 2 mg / ml using deionized water. The oxidized cellulose was then exfoliated into cellulose nanofibers by sonication at 400W power for 5 minutes in an ice-water bath. The prepared cellulose nanofiber suspension was then refrigerated and stored for later use, thus preparing the TEMPO cellulose nanofiber suspension.
[0084] S3. Modified carbon nanotubes are added to the nanocellulose suspension. The amount of modified carbon nanotubes added is 70 wt% of the solid content of nanocellulose. The mixture is stirred at room temperature for 4 h to form a uniform nanocellulose / carbon nanotube composite suspension.
[0085] S4, Dissolve 0.6g N-isopropylacrylamide and 0.06g N,N-methylenebisacrylamide in 12mL of distilled water and stir thoroughly to form a homogeneous N-isopropylacrylamide solution;
[0086] The prepared nanocellulose / carbon nanotube composite suspension and 0.06 g of photoinitiator Irgacure 2959 were added to the above mixed solution and stirred until a well dispersed poly(N-isopropylacrylamide) hydrogel precursor solution was formed.
[0087] S5. Dissolve 4g of acrylamide and 0.04g of N,N-methylenebisacrylamide in 30ml of distilled water and stir thoroughly to form a homogeneous acrylamide solution.
[0088] Nanocellulose suspension and 0.02g photoinitiator Irgacure 2959 were added to acrylamide solution and stirred to form a homogeneous polyacrylamide hydrogel precursor solution.
[0089] The polyacrylamide hydrogel precursor solution was transferred into a silicone mold and placed under a UV lamp for 4 minutes to polymerize into a polyacrylamide hydrogel.
[0090] S6, the poly(N-isopropylacrylamide) hydrogel precursor was transferred to the upper layer of the polyacrylamide hydrogel and placed under a UV lamp for 2 minutes.
[0091] Example 4
[0092] A photo / thermal dual-response hydrogel actuator based on polydopamine-coated carbon nanotubes is prepared by the following steps:
[0093] S1. Weigh 100g of tris(hydroxymethyl)aminomethane, dissolve it in 40mL of deionized water, and stir thoroughly using a magnetic stirrer.
[0094] Weigh 100g of carbon nanotubes and dissolve 100g of dopamine in a buffer solution, and stir for 24 hours.
[0095] The mixture was filtered, washed, and dried to obtain modified carbon nanotubes.
[0096] S2, weigh 0.04g of TEMPO and 0.4g of NaBr and add them to 400mL of deionized water. Stir the mixture thoroughly with a magnetic stirrer. After TEMPO and NaBr are completely dissolved, add 3g of crushed bleached wood pulp fiber powder to the reaction system.
[0097] After stirring vigorously until the cellulose is evenly dispersed, add 20g NaClO to the system and control the pH of the reaction system at 11 by continuously adding 0.4mol / L NaOH solution.
[0098] After reacting for 7 hours, the oxidized cellulose was filtered and washed 5 times with deionized water to obtain oxidized cellulose.
[0099] Oxidized cellulose was prepared into a slurry of 3 mg / ml using deionized water. The oxidized cellulose was then exfoliated into cellulose nanofibers by sonication at 400W power for 6 minutes in an ice-water bath. The prepared cellulose nanofiber suspension was then refrigerated and stored for later use, thus preparing the TEMPO cellulose nanofiber suspension.
[0100] S3. Modified carbon nanotubes are added to the nanocellulose suspension. The amount of modified carbon nanotubes added is 100 wt% of the solid content of nanocellulose. Stir at room temperature for 5 h to form a uniform nanocellulose / carbon nanotube composite suspension.
[0101] S4, Dissolve 0.8g N-isopropylacrylamide and 0.08g N,N-methylenebisacrylamide in 15mL of distilled water and stir thoroughly to form a homogeneous N-isopropylacrylamide solution;
[0102] The prepared nanocellulose / carbon nanotube composite suspension and 0.08 g of photoinitiator Irgacure 2959 were added to the above mixed solution and stirred until a well dispersed poly(N-isopropylacrylamide) hydrogel precursor solution was formed.
[0103] S5, Dissolve 6g of acrylamide and 0.06g of N,N-methylenebisacrylamide in 40ml of distilled water and stir thoroughly to form a homogeneous acrylamide solution;
[0104] Nanocellulose suspension and 0.03g photoinitiator Irgacure 2959 were added to acrylamide solution and stirred to form a homogeneous polyacrylamide hydrogel precursor solution.
[0105] The polyacrylamide hydrogel precursor solution was transferred into a silicone mold and placed under a UV lamp for 5 minutes to polymerize into a polyacrylamide hydrogel.
[0106] S6, the poly(N-isopropylacrylamide) hydrogel precursor was transferred to the upper layer of the polyacrylamide hydrogel and placed under a UV lamp for 3 minutes.
[0107] Poly(N-isopropylacrylamide) hydrogels with different nanocellulose contents were prepared using the method described in this invention and subjected to tensile tests. The tensile stress-strain curves are shown below. Figure 1 As shown, from Figure 1 As can be seen, nanocellulose significantly enhances the mechanical properties of poly(N-isopropylacrylamide) hydrogel.
[0108] Figure 2 The graph shows the bending angle of the hydrogel actuator prepared in the above embodiments as a function of time at 50 degrees Celsius. As can be seen from the graph, the hydrogel actuator of the present invention has excellent temperature responsiveness.
[0109] Figure 3 The graph shows the change in bending angle of the hydrogel actuator prepared for the above embodiments over time at 10 degrees Celsius. As can be seen from the graph, the hydrogel actuator of the present invention has resilience at low temperatures.
[0110] Figure 4 The graph shows the change in bending angle of the hydrogel actuator prepared in the above embodiment as a function of temperature. As can be seen from the graph, the temperature response range of the hydrogel actuator of the present invention is between 30-40°C.
[0111] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and principles of the described embodiments, and these modifications and variations should also be considered within the scope of protection of the present invention.
Claims
1. A method for preparing a photo / thermal dual-response hydrogel actuator, characterized in that, Includes the following steps: Modified carbon nanotubes were prepared using dopamine, carbon nanotubes, and tris(hydroxymethyl)aminomethane as raw materials. Nanocellulose suspension was prepared using bleached wood pulp fiber as raw material; A nanocellulose suspension was prepared by mixing modified carbon nanotubes with nanocellulose to obtain a nanocellulose / carbon nanotube composite suspension; the amount of modified carbon nanotubes added in the nanocellulose / carbon nanotube composite suspension was 20-100 wt% of the solid content of nanocellulose. A poly(N-isopropylacrylamide) hydrogel precursor solution was prepared using N-isopropylacrylamide and nanocellulose / carbon nanotube composite suspension as raw materials. Polyacrylamide hydrogels were prepared using acrylamide and nanocellulose suspensions as raw materials. A photo / thermal dual-response hydrogel actuator based on polydopamine-coated carbon nanotubes was prepared by transferring a poly(N-isopropylacrylamide) hydrogel precursor onto the surface of a polyacrylamide hydrogel.
2. The method for preparing the photo / thermal dual-response hydrogel actuator according to claim 1, characterized in that, The preparation of modified carbon nanotubes includes: A buffer solution was prepared by dissolving tris(hydroxymethyl)aminomethane in deionized water. Carbon nanotubes and dopamine were dissolved in a buffer solution and stirred for 24 hours. Modified carbon nanotubes were obtained by filtration, washing, and drying.
3. The method for preparing the photo / thermal dual-response hydrogel actuator according to claim 1, characterized in that, The preparation of the nanocellulose suspension includes: TEMPO and NaBr were added to deionized water in sequence and stirred thoroughly. After TEMPO and NaBr were completely dissolved, bleached wood pulp fiber powder was added to the reaction system. After stirring vigorously until the cellulose is evenly dispersed, add NaClO to the reaction system and control the pH of the reaction system at 9-11 by continuously adding NaOH solution. After reacting for 5-7 hours, the mixture was filtered and washed with deionized water to obtain oxidized cellulose. Oxidized cellulose was prepared into a slurry using deionized water, and then homogenized into cellulose nanofibers to obtain a nanocellulose suspension.
4. The method for preparing the photo / thermal dual-response hydrogel actuator according to claim 3, characterized in that, The preparation of the nanocellulose / carbon nanotube composite suspension includes: Modified carbon nanotubes were added to a nanocellulose suspension and stirred at room temperature to form a uniform nanocellulose / carbon nanotube composite suspension.
5. The method for preparing the photo / thermal dual-response hydrogel actuator according to claim 1, characterized in that, The preparation of the poly(N-isopropylacrylamide) hydrogel precursor solution includes: N-Isopropylacrylamide and N,N-methylenebisacrylamide were dissolved in distilled water and stirred thoroughly to form a homogeneous N-isopropylacrylamide hydrogel solution. The prepared nanocellulose / carbon nanotube suspension and photoinitiator Irgacure 2959 were added to the N-isopropylacrylamide hydrogel solution and stirred until a uniformly dispersed poly(N-isopropylacrylamide) hydrogel precursor solution was formed.
6. The method for preparing the photo / thermal dual-response hydrogel actuator according to claim 1, characterized in that, The preparation of the polyacrylamide hydrogel includes: Acrylamide and N,N-methylenebisacrylamide were dissolved in distilled water and stirred thoroughly to form a homogeneous acrylamide solution; Nanocellulose suspension and photoinitiator Irgacure 2959 were added to acrylamide solution and stirred to form a homogeneous polyacrylamide hydrogel precursor solution. The polyacrylamide hydrogel precursor solution was transferred into a mold and irradiated with a UV lamp for 3-5 minutes to polymerize into a polyacrylamide hydrogel.
7. The method for preparing the photo / thermal dual-response hydrogel actuator according to claim 1, characterized in that, The poly(N-isopropylacrylamide) hydrogel precursor is transferred to the upper surface of the polyacrylamide hydrogel and irradiated with a UV lamp for 1-3 minutes.
8. A photo / thermal dual-response hydrogel actuator, characterized in that, Prepared by the preparation method according to any one of claims 1 to 7.
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