CN111826765B - Electrochemical driving artificial muscle fiber and preparation method and application thereof - Google Patents

Abstract

The invention discloses an electrochemically driven artificial muscle fiber and a preparation method and application thereof. The electrochemically driven artificial muscle fiber includes at least one muscle yarn, wherein the muscle yarn is at least obtained by pre-crimping, plying and twisting a plurality of carbon nanotube narrow strips in sequence until a uniform helical structure is formed Or, the muscle yarn is obtained by at least twisting a single carbon nanotube narrow ribbon to form a uniform helical structure. The preparation method of the electrochemically driven artificial muscle fiber provided by the present invention is obtained by pre-crimping, plying, and twisting a plurality of narrow carbon nanotubes to obtain muscle yarn, or directly twisting carbon nanotubes to obtain muscle yarn, The obtained muscle yarn has a helical or threaded structure, thereby increasing the specific surface area of the carbon nanotube narrow band, and introducing a large number of micro-nano-scale pores inside the artificial muscle fiber, and improving the artificial muscle fiber by bundling or plying. energy density and drive stroke.

Description

Electrochemically driven artificial muscle fiber and its preparation method and application

technical field

The invention relates to a preparation method of artificial muscle fibers, in particular to an electrochemically driven artificial muscle fiber, a preparation method and application thereof, and belongs to the technical field of material science.

Background technique

Natural organisms use muscle fibers as a power device to obtain a driving effect. Artificial muscle (Artificial Muscle) is a new type of intelligent driving material that can generate reversible stretching and rotating motions under external stimuli (light, electricity, heat, solvent, magnetism, etc.) Robots and other aspects have important application prospects. How to simulate biological muscles and prepare artificial muscle fibers is a hot topic that scientists have devoted to research recently. The development of high-performance artificial muscle fibers will greatly promote the design of small, strong, and flexible robots, prosthetics, and biomedical applications.

Commonly used artificial muscle fiber materials include carbon nanotube fibers, graphene fibers, carbon fibers, polymer threads (polyethylene, nylon, polyimide, etc.), nickel-titanium silk, cellulose composite fibers, spider silk, silk, shape memory Alloy wire etc.

However, the current artificial muscle fibers still have many problems, such as slow response rate, low driving stroke, low energy density and power density, and low efficiency. How to obtain fast response rate, large driving stroke, high energy density and power density, Efficiency and large-scale mass production are still technical issues that need to be solved urgently.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide an electrochemically driven artificial muscle fiber with targeted regulation and a preparation method and application thereof. Through structural design, an artificial muscle fiber with large driving stroke, high energy density and high efficiency can be realized, thereby overcoming the existing problems. There are technical deficiencies.

In order to realize the foregoing invention purpose, the technical scheme adopted in the present invention includes:

An embodiment of the present invention provides an electrochemically driven artificial muscle fiber, which includes at least one muscle yarn, wherein the muscle yarn is at least composed of a plurality of carbon nanotube narrow ribbons that are pre-crimped, plied and twisted in sequence, Until a uniform helical structure is formed, or the muscle yarn is at least obtained by twisting a single carbon nanotube narrow ribbon to form a uniform helical structure.

Further, the carbon nanotube narrow strips include carbon nanotube narrow strips prepared by a floating chemical vapor deposition method.

Further, the plurality of carbon nanotubes in the narrow band of carbon nanotubes are disorderly interwoven.

Further, the tensile strength of the carbon nanotube narrow band in the length direction is greater than 50MPa;

In some specific embodiments, the muscle yarn is obtained by sequentially pre-crimping, plying, twisting, and over-twisting a plurality of carbon nanotube narrow ribbons.

Further, the muscle yarn is at least formed by first coiling the carbon nanotube narrow tape along the length direction to form pre-curled carbon nanotube fibers, and then multiple pre-curled carbon nanotube fibers are sequentially plied and twisted. , until a uniform helical structure is formed.

In some specific embodiments, the muscle yarn is obtained by at least sequentially twisting and over-twisting the carbon nanotube narrow ribbon until a uniform helical structure is formed.

In some specific embodiments, the electrochemically driven artificial muscle fiber comprises a plurality of muscle yarns, and the electrochemically driven artificial muscle fiber is formed by combining a plurality of muscle yarns in a bundled manner.

Further, the whole artificial muscle fiber has a uniform helical structure.

Further, the twists of the twisting and over-twisting are 200-10000 turns/meter.

Further, the electrochemically driven artificial muscle fibers include 1-10 muscle yarns.

Further, the diameter of the muscle yarn is 20-5000 μm, and the density is 1.2-5 g/cm ³ .

An embodiment of the present invention also provides a method for preparing an electrochemically driven artificial muscle fiber, comprising:

At least a plurality of carbon nanotube narrow ribbons are sequentially pre-crimped, twisted, and twisted to form a uniform helical structure to form a muscle yarn, or at least the carbon nanotube narrow ribbons are twisted until a uniform helical structure is formed to obtain muscle yarns The muscle yarn is the electrochemically driven artificial muscle fiber.

Further, the preparation method includes: preparing the carbon nanotube narrow band by a floating chemical vapor deposition method.

Further, the plurality of carbon nanotubes in the narrow band of carbon nanotubes are disorderly interwoven.

Further, the tensile strength of the carbon nanotube narrow band in the longitudinal direction is greater than 50 MPa.

In some specific embodiments, the preparation method includes: sequentially pre-crimping, plying and twisting a plurality of carbon nanotube narrow ribbons, and over-twisting until a uniform helical structure is formed, thereby forming a muscle yarn.

Further, the preparation method includes: firstly coiling the carbon nanotube narrow tapes along the length direction to form pre-crimped carbon nanotube fibers, and then plying and twisting a plurality of pre-crimped carbon nanotube fibers in sequence until A uniform helical structure is formed, resulting in muscle yarns.

In some specific embodiments, the preparation method includes: sequentially twisting and over-twisting the carbon nanotube narrow ribbon to form a uniform helical structure, thereby obtaining muscle yarn.

In some specific embodiments, the preparation method further comprises: combining multiple muscle yarns in a bundled manner to form an electrochemically driven artificial muscle fiber.

Further, the whole artificial muscle fiber has a uniform helical structure.

Further, the twisting degree of the twisting and over-twisting is 2000-10000 turns/meter.

Further, the plurality of muscle yarns are 1-10.

Further, the diameter of the muscle yarn is 20-5000 μm, and the density is 1.2-5 g/cm ³ .

The embodiment of the present invention also provides the use of the electrochemically driven artificial muscle fiber in preparing an intelligent driving mechanism.

The embodiment of the present invention also provides an intelligent driving mechanism, which includes:

the electrochemically actuated artificial muscle fiber; and

an electrolyte solution in contact with the electrochemically driven artificial muscle fiber, wherein at least part of the electrolyte solution enters the interior of the artificial muscle fiber;

The artificial muscle fibers are also electrically connected to a power source.

An embodiment of the present invention also provides an electrochemically driven artificial muscle fiber, which includes at least one muscle yarn, and the muscle yarn has a uniform thread structure; wherein the muscle yarn is a conductive fiber, and the muscle yarn is a conductive fiber. Conductive fibers include carbon nanotube fibers and/or carbon nanotube composite fibers.

Further, the carbon nanotube fibers include carbon nanotube fibers prepared by any one of the floating catalytic method, wet spinning, and dry spinning.

Further, the carbon nanotube composite fibers include carbon nanotubes, transition metal oxides and/or conductive polymers composited with carbon nanotubes, and the transition metal oxides include manganese dioxide, ruthenium dioxide, and vanadium dioxide. A combination of any one or more of the conductive polymers, the conductive polymer includes a combination of any one or more of polyaniline, polypyrrole, and polyethylene dioxythiophene.

Further, the muscle yarn is formed by plying, twisting, and over-twisting a plurality of pre-crimped conductive fibers in sequence, or the muscle yarn is formed by twisting conductive fibers.

Further, the electrochemically driven artificial muscle fibers are formed by combining multiple strands of muscle yarns in a bundled manner.

Compared with the prior art, the advantages of the present invention include:

1) A preparation method of an electrochemically driven artificial muscle fiber provided by the embodiment of the present invention, at least the carbon nanotube narrow band is crimped along the length direction to form a pre-crimped carbon nanotube fiber, and the plurality of pre-crimped fibers are sequentially plyed and added. After twisting, a muscle yarn is obtained, or, the carbon nanotube narrow belt is twisted and over-twisted in turn to obtain a muscle yarn, and the radial cross-section of the muscle yarn has a thread or helical structure similar to the longitudinal cross-section of an onion, and then Increase the specific surface area of the carbon nanotube narrow band;

2) A preparation method of an electrochemically driven artificial muscle fiber provided by the embodiment of the present invention, the method bundles a plurality of muscle yarns, between the spirals, between the muscle yarns and the muscle yarns, and between the carbon tubes. There are micro-nano-scale pores between the carbon tube and the carbon tube;

3) The preparation method of an electrochemically driven artificial muscle fiber provided in the embodiment of the present invention can prepare artificial muscle fibers that meet different requirements according to different requirements, introduce a large number of micro-nano-level pores in the artificial muscle fiber, and pass the artificial muscle fibers. The energy density and driving stroke of artificial muscle fibers can be improved by bundling or plying.

Description of drawings

1 is a schematic flow chart of a method for preparing an electrochemically driven artificial muscle fiber in Embodiment 1 and Embodiment 2 of the present invention;

2 is a schematic flow chart of a method for preparing an electrochemically driven artificial muscle fiber in Embodiment 3 of the present invention;

3 is a graph showing the variation of the voltage of an electrochemically driven artificial muscle fiber with time in Example 1 of the present invention, and a graph showing the variation of the driving amount of the working electrode with time in Example 1 of the present invention and Comparative Example 1;

Figure 4 is the energy density of the working electrode under different load stresses in Example 2 and Comparative Example 2 of the present invention;

FIG. 5 is the energy density of the working electrode under different load stresses in Example 3 and Comparative Example 3 of the present invention.

Detailed ways

In view of the deficiencies in the prior art, the inventor of the present application was able to propose the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

The embodiments of the present invention provide a method for preparing an electrochemically driven artificial muscle fiber, which can meet various performance requirements according to specific target requirements (such as achieving a large driving stroke, high energy density, etc.); wherein, the method comprises the following steps: The carbon nanotube fibers prepared by the floating chemical vapor deposition method are the initial raw materials, and through the design of different structures, they can meet different target requirements, such as high response rate, large driving stroke and high energy density.

An embodiment of the present invention provides an electrochemically driven artificial muscle fiber, which includes at least one muscle yarn, wherein the muscle yarn is at least composed of a plurality of carbon nanotube narrow ribbons that are pre-crimped, plied and twisted in sequence, Until a uniform helical structure is formed, or the muscle yarn is at least obtained by twisting a narrow ribbon of carbon nanotubes to form a uniform helical structure.

In some specific embodiments, the muscle yarn is obtained by sequentially pre-crimping, plying, twisting, and over-twisting a plurality of carbon nanotube narrow ribbons.

Further, the muscle yarn is at least formed by first coiling the carbon nanotube narrow tape along the length direction to form pre-curled carbon nanotube fibers, and then multiple pre-curled carbon nanotube fibers are sequentially plied and twisted. , until a uniform helical structure is formed.

In some specific embodiments, the muscle yarn is obtained by at least sequentially twisting and over-twisting the carbon nanotube narrow ribbon until a uniform helical structure is formed.

An embodiment of the present invention also provides a method for preparing an electrochemically driven artificial muscle fiber, comprising:

preparing the carbon nanotube narrow ribbon by a floating chemical vapor deposition method;

At least a plurality of carbon nanotube narrow ribbons are sequentially pre-crimped, twisted, and twisted to form a uniform helical structure to form a muscle yarn, or at least the carbon nanotube narrow ribbons are twisted until a uniform helical structure is formed to obtain muscle yarns The muscle yarn is the electrochemically driven artificial muscle fiber.

In some specific embodiments, the preparation method includes: firstly coiling the carbon nanotube narrow ribbons along the length direction to form pre-crimped carbon nanotube fibers, and then successively rolling the plurality of pre-crimped carbon nanotube fibers Muscle yarns are obtained by plying and twisting until a uniform helix is formed.

In some specific embodiments, the preparation method includes: sequentially twisting and over-twisting a single carbon nanotube narrow ribbon to form a uniform helical structure, thereby obtaining a muscle yarn.

An embodiment of the present invention also provides an electrochemically driven artificial muscle fiber, which includes at least one muscle yarn, and the muscle yarn has a uniform thread structure; wherein the muscle yarn is a conductive fiber, and the muscle yarn is a conductive fiber. Conductive fibers include carbon nanotube fibers and/or carbon nanotube composite fibers.

Wherein, the muscle yarns are conductive fibers, and the conductive fibers include carbon nanotube fibers and/or carbon nanotube composite fibers; and the carbon nanotube fibers include floating catalytic, wet spinning, and dry spinning. Carbon nanotube fibers prepared by any one of the above methods, or, the carbon nanotube composite fibers include carbon nanotubes and transition metal oxides and/or conductive polymers composited with carbon nanotubes, and the transition metal oxides include A combination of any one or more of manganese dioxide, ruthenium dioxide, and vanadium dioxide, and the conductive polymer includes a combination of any one or more of polyaniline, polypyrrole, and polyethylene dioxythiophene.

It should be noted that the twist of the muscle yarn formed by twisting is 2000-10000 rpm/m; when the muscle yarn is twisted, the obtained fibers will form a uniform helical structure.

Specifically, please refer to FIG. 1. Taking 4-strand plying as an example, a method for preparing an electrochemically driven artificial muscle fiber includes the following steps:

1) The carbon nanotube narrow strip prepared by floating chemical vapor deposition method is used as the raw material. The length of the carbon nanotube narrow strip is 5-50cm, the width is 0.2cm-3cm, the thickness is 20μm-500μm, and the density is 1.2g/ ^cm3-5g /cm ³ , a plurality of carbon nanotubes in the carbon nanotube narrow band are disorderly interwoven, and the tensile strength of the carbon nanotube narrow band in the length direction is greater than 50 MPa;

Crimping along its length direction to obtain pre-crimped carbon nanotube fibers, the diameter of the pre-crimped carbon nanotube fibers is 20-5000 μm, and the density is 1.2-5 g/cm ³ ;

2) Plying, twisting, and over-twisting four identical pre-crimped carbon nanotube fibers to obtain a carbon nanotube muscle yarn with four pre-crimped carbon nanotube fibers, namely electrochemically driven artificial muscle fibers.

Specifically, please refer to FIG. 2. Taking the 3-strand bundle as an example, a method for preparing an electrochemically driven artificial muscle fiber includes the following steps:

1) The carbon nanotube narrow strip prepared by the floating chemical vapor deposition method is used as the raw material. The length of the carbon nanotube narrow strip is 5-50cm, the width is 0.2cm-3cm, the thickness is 20μm--500μm, and the density is 1.2g/cm ³ -5g/cm ³ , a plurality of carbon nanotubes in the carbon nanotube narrow band are disorderly interwoven, and the tensile strength of the carbon nanotube narrow band in the length direction is greater than 50MPa;

The carbon nanotube narrow ribbon is twisted until excessive twisting (twist is 2000-10000 revolutions/meter) to obtain a carbon nanotube muscle yarn with a uniform helical structure, and the diameter of the carbon nanotube muscle yarn is 20-5000 μm , the density is 1.2-5g/cm ³ ;

2) bundling three identical carbon nanotube muscle yarns with a helical structure to obtain an artificial muscle fiber, that is, an electrochemically driven artificial muscle fiber.

Of course, the bundled carbon nanotube yarns are not limited to 3 strands or 4 strands, but can also be bundled in 1-10 strands or other numbers.

The use of carbon nanotube fibers in the present invention includes, but is not limited to, carbon nanotube fibers obtained by wet spinning, electrospinning and other methods, carbon nanotube composite fibers (carbon nanotube composite transition metal oxides, such as manganese dioxide, Ruthenium dioxide, vanadium dioxide, etc., conductive polymers, such as polyaniline, polypyrrole, polyethylene dioxythiophene, etc.).

Example 1

Referring to Figure 1, take a carbon nanotube narrow ribbon with a length of about 20 cm and a width of about 700 μm, prepared by the floating catalysis method, and coil it along its length to form a pre-rolled carbon nanotube fiber with a diameter of 140 μm.

Take four identical pre-crimped carbon nanotube fibers for plying, and then continue to twist (the twist is 2800 rpm/m) until a uniform helical structure is formed, and then four pre-crimped carbon nanotube fibers are plyed. Artificial muscle yarn Thread, namely artificial muscle fiber, the length of the artificial muscle fiber is about 6cm, and its diameter is about 125μm;

The artificial muscle fiber was used as the working electrode of the electrochemical driving system, the carbon nanotube film after nitric acid activation (1M/L HNO was activated by CV method for ₂₀ cycles) was used as the counter electrode, and the Ag/Ag ⁺ electrode was used as the reference. As an electrode, 0.2 M tetraethylammonium tetrafluoroborate (TEA·BF ₄ ) was dissolved in propylene carbonate solvent as an electrolyte solution.

Assemble the three-electrode system, use the electrochemical drive device to collect the driving data, and use the electrochemical workstation to collect the electrochemical data; the electrochemical workstation parameter setting: the electrochemical workstation mode adopts the chronoamperometry, high voltage: 2.5V; Low voltage: 0V; Frequency: 0.1Hz; Cycle: 2 turns.

At the same time, the driving acquisition system and the electrochemical workstation were started, and the curve of the driving amount of the artificial muscle fiber with time under the square wave voltage was obtained as shown in Figure 3.

Comparative Example 1

Take the carbon nanotube narrow ribbon with a length of about 12cm and prepared by the floating catalytic method, and twist it directly through a twisting device (the twist is about 6000 rpm/m) until a uniform helical structure is formed, and then a single-strand muscle yarn is obtained. Threads, namely artificial muscle fibers, have a length of about 3 cm and a diameter of about 100 μm;

The artificial muscle fiber was used as the working electrode of the electrochemical driving system, the carbon nanotube film after nitric acid activation (1M/L HNO3 was activated by CV method for 20 cycles) was used as the counter electrode, and the Ag/Ag ⁺ electrode was used as the reference electrode. , 0.2M tetraethylammonium tetrafluoroborate (TEA·BF ₄ ) was dissolved in propylene carbonate solvent as an electrolyte solution.

Assemble the three-electrode system, use the electrochemical drive device to collect the driving data, and use the electrochemical workstation to collect the electrochemical data; the electrochemical workstation parameter setting: the electrochemical workstation mode adopts the chronoamperometry, high voltage: 2.5V; Low voltage: 0V; Frequency: 0.1Hz; Cycle: 2 turns.

At the same time, the driving acquisition system and the electrochemical workstation were started, and the curve of the driving amount of the artificial muscle fiber with time under the square wave voltage was obtained as shown in Figure 3.

Example 2

Referring to Figure 1, take a carbon nanotube narrow ribbon with a length of about 20 cm and a width of about 700 μm, prepared by a floating catalysis method, and coil it along its length to form a pre-rolled carbon nanotube fiber with a diameter of 140 μm;

Take four identical pre-crimped carbon nanotube fibers and continue twisting (the twist is about 2800 rpm) until a uniform helical structure is formed, and then four pre-crimped carbon nanotube fibers are obtained. That is, the artificial muscle fiber, the length of the artificial muscle fiber is about 6cm, and the diameter is about 125μm;

The artificial muscle fiber was used as the working electrode of the electrochemical driving system, the carbon nanotube film after nitric acid activation (1M/L HNO was activated by CV method for ₂₀ cycles) was used as the counter electrode, and the Ag/Ag ⁺ electrode was used as the reference. As an electrode, 0.2 M tetraethylammonium tetrafluoroborate (TEA·BF ₄ ) was dissolved in propylene carbonate solvent as an electrolyte solution.

The three-electrode system is assembled, and the electrochemical driving device is used to collect the driving data, and the electrochemical workstation is used to collect the electrochemical data. Electrochemical workstation parameter setting: electrochemical workstation mode adopts chronoamperometry, high voltage: 2.5V; low voltage: 0V; frequency: 0.1Hz; cycle: 2 circles.

By changing different loading stresses, the energy density diagrams of artificial muscle fibers under different loading stresses were calculated, as shown in Figure 4.

Comparative Example 2

Take a carbon nanotube narrow ribbon with a length of about 12 cm and prepared by a floating catalysis method, and twist it directly through a twisting device (the twist is about 6000 rpm/m) until a uniform helical structure is formed, and then a single muscle is obtained. Yarn, that is, artificial muscle fiber, its length is about 3cm and its diameter is about 100μm;

The artificial muscle fiber was used as the working electrode of the electrochemical driving system, the carbon nanotube film after nitric acid activation (1M/L HNO was activated by CV method for ₂₀ cycles) was used as the counter electrode, and the Ag/Ag ⁺ electrode was used as the reference. As an electrode, 0.2 M tetraethylammonium tetrafluoroborate (TEA·BF ₄ ) was dissolved in propylene carbonate solvent as an electrolyte solution.

The three-electrode system is assembled, and the electrochemical driving device is used to collect the driving data, and the electrochemical workstation is used to collect the electrochemical data. Electrochemical workstation parameter setting: electrochemical workstation mode adopts chronoamperometry, high voltage: 2.5V; low voltage: 0V; frequency: 0.1Hz; cycle: 2 circles.

By changing different loading stresses, the energy density diagrams of artificial muscle fibers under different loading stresses were calculated, as shown in Figure 4.

Example 3

Referring to Figure 2, take a carbon nanotube narrow ribbon with a length of about 20 cm and a width of about 700 μm, prepared by the floating catalysis method, and twist the carbon nanotube narrow ribbon by a twisting device (the twist is 6000 turns/m, the twist angle 45°) until a muscle yarn with a uniform helical structure is formed; the muscle yarn has a length of 5 cm and a diameter of about 100 μm;

Three identical muscle yarns are bundled to obtain artificial muscle fibers bundled by three muscle yarns;

The artificial muscle fiber was used as the working electrode of the electrochemical driving system, the carbon nanotube film after nitric acid activation (1M/L HNO was activated by CV method for ₂₀ cycles) was used as the counter electrode, and the Ag/Ag ⁺ electrode was used as the reference. As an electrode, 0.2 M tetraethylammonium tetrafluoroborate (TEA·BF ₄ ) was dissolved in propylene carbonate solvent as an electrolyte solution.

Assemble the three-electrode system, use the electrochemical driving device to collect the driving data, use the electrochemical workstation to collect the electrochemical data, and set the parameters of the electrochemical workstation: the electrochemical workstation mode adopts the chronoamperometry, high voltage: 2.5V; Low voltage: 0V; Frequency: 0.1Hz; Cycle: 2 turns.

Changing different loading stresses, the energy density diagrams of artificial muscle fibers under different loading stresses are calculated as shown in Figure 5.

Comparative Example 3

Referring to Figure 2, take a carbon nanotube narrow ribbon with a length of about 20 cm and a width of about 700 μm, prepared by the floating catalysis method, and twist the carbon nanotube narrow ribbon by a twisting device (the twist is 6000 turns/m, the twist angle is 45°) until a muscle yarn with a uniform helical structure is formed, that is, an artificial muscle fiber, and the artificial muscle fiber has a length of 5 cm and a diameter of about 100 μm;

The artificial muscle fiber of single-strand muscle yarn was used as the working electrode of the electrochemical driving system, the carbon nanotube film after nitric acid activation (1M/L HNO ₃ was activated by CV method for 20 cycles) was used as the counter electrode, and Ag/Ag was used as the counter electrode. The ⁺ electrode was used as a reference electrode, and 0.2 M tetraethylammonium tetrafluoroborate (TEA·BF ₄ ) was dissolved in a propylene carbonate solvent as an electrolyte solution.

Assemble the three-electrode system, use the electrochemical driving device to collect the driving data, use the electrochemical workstation to collect the electrochemical data, and set the parameters of the electrochemical workstation: the electrochemical workstation mode adopts the chronoamperometry, high voltage: 2.5V; Low voltage: 0V; Frequency: 0.1Hz; Cycle: 2 turns.

Changing different loading stresses, the energy density diagrams of artificial muscle fibers under different loading stresses are calculated as shown in Figure 5.

The invention provides a method for preparing an electrochemically driven artificial muscle fiber. The carbon nanotubes are pre-crimped to obtain a pre-crimped carbon nanotube fiber, and a plurality of pre-crimped carbon nanotube fibers are plyed and further twisted to form a uniform spiral. Structured muscle yarn, due to the existence of pre-crimping, a large number of micro-channels are formed on the cross-section of muscle yarn. A large number of micro-nano-scale pores are formed between the carbon tubes and between the carbon tubes, which greatly increases the specific surface area of the muscle fibers, improves the contact area between the electrolyte solution and the interior of the muscle fibers, and provides rapid transport of ions. channel, can achieve the effect of increasing the driving performance, on the one hand, it speeds up the response rate, (the response rate can be obtained from the curve in the lower figure of Figure 3, the greater the slope of the curve, the faster the response rate), on the other hand, it can increase the driving stroke (the driving stroke can be obtained from the ordinate of the lower figure in Figure 3, the larger the value of the ordinate, the larger the driving stroke); in addition, the purpose of increasing the energy density after the pre-crimped carbon nanotube fibers is plied; Combining multiple single-strand carbon nanotube muscle yarns in bundles can also increase the energy density.

The carbon nanotube narrowbands in the present invention are formed by chemical vapor deposition, and the combination modes of a plurality of carbon nanotube narrowbands are different, and can be combined by plying or clustering; and, the invention provides A driving method for electrochemically driving artificial muscle fibers is electrochemical driving. The electrochemically driving artificial muscle fibers can increase the porosity through the method of plying and bundling, and improve the effective contact area between the muscle yarn and the electrolyte solution, which is a fast ionization method. The transmission provides the channel.

The embodiment of the present invention provides a method for preparing an electrochemically driven artificial muscle fiber. The carbon nanotube narrow ribbon is pre-crimped along its length direction to obtain the pre-crimped carbon nanotube fiber, and the pre-crimped carbon nanotube fibers are After plying and twisting, a muscle yarn is obtained, and the radial section of the muscle yarn has a thread or helical structure similar to the longitudinal section of an onion, and presents an onion-like helix or thread structure, thereby increasing the narrow band of carbon nanotubes. specific surface area; and, a method for preparing an electrochemically driven artificial muscle fiber provided by the embodiment of the present invention can prepare artificial muscle fibers that meet different requirements according to different requirements, and introduce a large number of micro-nano-scale pores into the artificial muscle fiber, And the energy density and driving stroke of artificial muscle fibers are improved by bundling or plying.

It should be understood that the above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (17)

1. an electrochemically driven artificial muscle fiber is characterized in that comprising a plurality of muscle yarns, and the electrochemically driven artificial muscle fiber is to form after a plurality of muscle yarns are combined in a bundled manner; Wherein, the muscle yarn is formed by at least coiling the carbon nanotube narrow tape along the length direction to form a pre-crimped carbon nanotube fiber drum, and then a plurality of pre-crimped carbon nanotube fiber drums are sequentially plied, Twisting until a uniform helical structure is formed, the twisting degree of the twisting is 2000-10000 revolutions/meter, the diameter of the muscle yarn is 20-5000 μm, and the density is 1.2-5 g/cm ³ ; and, There are micro-nano-scale pores between the spirals of each muscle yarn, between the muscle yarns and the muscle yarns, and between the carbon nanotubes and the carbon nanotubes. 2 . The electrochemically driven artificial muscle fiber according to claim 1 , wherein the carbon nanotube narrow band comprises a carbon nanotube narrow band prepared by a floating chemical vapor deposition method. 3 . 3 . The electrochemically driven artificial muscle fiber according to claim 1 , wherein a plurality of carbon nanotubes in the narrow band of carbon nanotubes are disorderly interwoven. 4 . 4 . The electrochemically driven artificial muscle fiber according to claim 1 , wherein the tensile strength of the carbon nanotube narrow band in the longitudinal direction is greater than 50 MPa. 5 . 5 . The electrochemically driven artificial muscle fiber according to claim 1 , wherein the muscle yarn is obtained from a plurality of carbon nanotube narrow ribbons through pre-crimping, plying, twisting, and over-twisting in sequence. 6 . 6 . The electrochemically driven artificial muscle fiber according to claim 1 , wherein the artificial muscle fiber has a uniform helical structure as a whole. 7 . 7 . The electrochemically driven artificial muscle fiber according to claim 1 , wherein the electrochemically driven artificial muscle fiber comprises 3-10 muscle yarns. 8 . 8. a preparation method of the electrochemically driven artificial muscle fiber according to any one of claims 1-7, is characterized in that comprising: First, the carbon nanotube narrow tape is coiled along the length direction to form a pre-rolled carbon nanotube narrow tape roll, and then multiple pre-rolled carbon nanotube narrow tape rolls are sequentially plied and twisted until a uniform helical structure is formed. Muscle yarn, the twist of the twist is 2000-10000 revolutions/meter; Electrochemically driven artificial muscle fibers are formed by combining multiple muscle yarns in bundles. 9 . The preparation method according to claim 8 , characterized in that it comprises: preparing the carbon nanotube narrow band by a floating chemical vapor deposition method. 10 . 10 . The preparation method according to claim 8 , wherein a plurality of carbon nanotubes in the narrow band of carbon nanotubes are disorderly interwoven. 11 . 11 . The preparation method according to claim 8 , wherein the tensile strength of the carbon nanotube narrow band in the longitudinal direction is greater than 50 MPa. 12 . 12. The preparation method according to claim 8, characterized in that it comprises: pre-crimping, plying, twisting, and over-twisting a plurality of carbon nanotube narrow ribbons in sequence until a uniform helical structure is formed, thereby forming a muscle yarn, The twist degree of the twisting and over-twisting is 2000-10000 revolutions/meter. 13. The preparation method according to any one of claims 8-12, wherein the artificial muscle fiber has a uniform helical structure as a whole. 14. The preparation method according to claim 8, wherein the number of the plurality of muscle yarns is 3-10. 15 . The preparation method according to claim 8 , wherein the muscle yarn has a diameter of 20-5000 μm and a density of 1.2-5 g/cm ³ . 16. The use of the electrochemically driven artificial muscle fiber according to any one of claims 1 to 7 in the preparation of an intelligent driving mechanism. 17. An intelligent drive mechanism, characterized in that it comprises: The electrochemically driven artificial muscle fiber of any one of claims 1-7; and an electrolyte solution in contact with the electrochemically driven artificial muscle fiber, wherein at least part of the electrolyte solution enters the interior of the artificial muscle fiber; The artificial muscle fibers are also electrically connected to a power source.

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