Stretchable textile-based triboelectric nanogenerator based on tubular helical woven structure

Abstract

The application relates to a stretchable textile-based friction nanogenerator based on a tubular spiral woven structure and relates to the field of textiles. The application utilizes the large deformability of the tubular spiral woven structure and the elastic recovery performance of the elastic core yarn to realize the super-elasticity and high flexibility of the stretchable textile-based friction nanogenerator based on the tubular spiral woven structure. When the stretchable textile-based friction nanogenerator is stretched and recovered, an electric signal can be generated by the contact separation of the first friction woven yarn and the second friction woven yarn, without the need for friction or contact separation with other materials. When an external force such as touch or pressing is applied to the stretchable textile-based friction nanogenerator, an electric signal can also be generated. The stretchable performance of the textile-based friction nanogenerator is improved, the device structure is simplified, the preparation method is simple, large-scale production can be realized by using existing equipment, the types of materials used are reduced, the materials used are generally easy to obtain, and the processing cost and material cost are greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, in particular to a stretchable textile-based friction nanogenerator based on a tubular spiral woven structure. BACKGROUND

[0002] Since 2012, friction nanogenerators have gradually attracted widespread attention, and in combination with other disciplines, have produced multiple development directions, including electronic textiles, papermaking, and self-driven chemical / environmental sensors, etc. intelligent devices, expanding the application range of friction nanogenerators.

[0003] Textile-based friction nanogenerators are one of the research directions, which combine the flexibility and wearability of textiles with the energy collection and sensing functions of friction nanogenerators, and can be applied to personal health and biomedical detection, artificial electronic skin, and wearable human-computer interaction, etc. With the development of textile-based friction nanogenerators, the requirements for stretchability, high efficiency, light weight, comfort and flexibility of textile devices are constantly improving, and stretchability is the most easily responsive deformation of wearable textiles to human motion, and is also an important indicator of the comfort of most textiles.

[0004] However, the current research on stretchable textile-based friction nanogenerators is not perfect, the preparation method is relatively limited, and the types of materials used are many, the production process is long, and the process is complex, which limits the promotion of stretchable textile-based friction nanogenerators in the field of energy collection or sensing. SUMMARY

[0005] The purpose of the present application is to provide a stretchable textile-based friction nanogenerator based on a tubular spiral woven structure to solve the problems existing in the prior art, and to improve the stretchability and wearability of textile-based friction nanogenerators, simplify the production process, and reduce the types of materials used.

[0006] To achieve the above purpose, the technical solution adopted by the present application is:

[0007] A stretchable textile-based friction nanogenerator based on a tubular spiral woven structure, comprising a core yarn and an outer woven layer located on the outer periphery of the core yarn, the outer woven layer is formed by at least three friction woven yarns interlaced and woven to form a plurality of spiral woven structure power generation units, each spiral woven structure power generation unit includes at least three parallel yarns and two spiral woven chains; wherein the core yarn is a rubber tube, and the friction woven yarn includes first friction woven yarns and second friction woven yarns with different friction electrode polarities.

[0008] In one possible implementation, the first friction woven yarn is a flexible conductive yarn, and the second friction woven yarn is a dielectric fiber material.

[0009] In a possible implementation, the first frictional braided yarn includes at least one of silver-plated conductive yarn, silver fiber, graphene fiber, and carbon fiber; and the second frictional braided yarn includes at least one of polyamide filament, polyester, cotton, and wool.

[0010] In a possible implementation, the first frictional braided yarn is silver-plated conductive yarn as a negative friction material, and the second frictional braided yarn is polyamide filament as a positive friction material.

[0011] In a possible implementation, the silver-plated conductive yarn is polyamide conductive yarn prepared by coating a silver coating on the outer surface of the polyamide filament.

[0012] In a possible implementation, the outer braided layer is formed by interlacing three frictional braided yarns, including one first frictional braided yarn and two second frictional braided yarns.

[0013] In a possible implementation, the outer braided layer is formed by interlacing three frictional braided yarns, including two first frictional braided yarns and one second frictional braided yarn.

[0014] In a possible implementation, the spiral braided chain is a continuous braided intersection in a spiral chain shape between adjacent two yarns during braiding due to interlacing, and the continuous braided intersection is protruded and wound on the spiral braided chain of the surface layer of the core yarn due to interlacing, and the adjacent spiral braided chains are the closely arranged parallel yarns.

[0015] The technical scheme provided in the application has at least the following beneficial effects:

[0016] The application utilizes the large deformability of the tubular spiral braided structure and the elastic recovery performance of the elastic core yarn to realize the super-elasticity and high flexibility of the stretchable textile-based frictional nanometer generator based on the tubular spiral braided structure; the stretchable textile-based frictional nanometer generator is stretched and recovered, and an electric signal is generated by the contact and separation of the first frictional braided yarn and the second frictional braided yarn, without relying on friction or contact separation with other materials; an external force such as touch or pressing is applied to the stretchable textile-based frictional nanometer generator, and an electric signal is generated, improving the stretchable performance of the textile-based frictional nanometer generator, simplifying the device structure, and facilitating the preparation method, which can be mass-produced by using existing equipment, reducing the types of materials used, and generally obtaining the materials, greatly reducing the processing cost and material cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application, and are used to explain the application together with the embodiments of the application, and do not constitute a limitation on the application. In the drawings:

[0018] Figure 1 A structure diagram of a stretchable textile-based friction nanogenerator based on a tubular spiral woven structure is shown according to an example embodiment of the present application;

[0019] Figure 2 A structure diagram of a spiral woven structure power generation unit of a stretchable textile-based friction nanogenerator based on a tubular spiral woven structure is shown according to an example embodiment of the present application;

[0020] Figure 3 A structure diagram of a stretchable textile-based friction nanogenerator based on a tubular spiral woven structure when a first friction woven yarn is a silver-plated conductive yarn is shown according to an example embodiment of the present application;

[0021] Figure 4 A structure diagram of a stretchable textile-based friction nanogenerator based on a tubular spiral woven structure is shown according to an example embodiment of the present application;

[0022] In the figure:

[0023] 1, core yarn; 2, outer woven layer; 3, friction woven yarn; 4, spiral woven structure power generation unit;

[0024] 31, first friction woven yarn; 32, second friction woven yarn;

[0025] 41, parallel yarn; 42, spiral woven chain;

[0026] 311, polyamide filament; 312, silver coating. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] Wherein, the same parts are indicated by the same reference signs. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the present application, and the words "bottom" and "top", "inner" and "outer" refer to the directions towards or away from the specific components. In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more. In the description of the present application, the meaning of "multiple" is two or more.

[0029] The present application will be further described below in conjunction with the drawings and examples.

[0030] Example one:

[0031] Figure 1 The structure of the stretchable textile-based frictional nanogenerator based on the tubular spiral woven structure provided by an exemplary embodiment of the present application is shown, which includes a core yarn 1 and an outer woven layer 2 located on the outer periphery of the core yarn 1, and the outer woven layer 2 is formed by at least three frictional woven yarns 3 interlaced and woven to form a plurality of spiral woven structure power generation units 4. Please refer to Figure 1 and Figure 2 Each spiral woven structure power generation unit 4 includes at least three parallel yarns 41 and two spiral woven chains 42; wherein the core yarn 1 is a rubber tube, and the frictional woven yarn 3 includes a first frictional woven yarn 31 with different frictional electrode polarity and a second frictional woven yarn 32.

[0032] In the embodiment of the present application, the main functions of the core yarn 1 (i.e. the rubber tube) include two aspects: one is to serve as a support structure for the outer woven layer 2; the other is to have high elastic stretchability and flexibility, which can be combined with the woven layer with high deformation capability, so that the stretchable textile-based frictional nanogenerator based on the tubular spiral woven structure can achieve excellent elastic recovery performance under external force, so as to achieve the purpose of contact and separation of the first frictional woven yarn 31 and the second frictional woven yarn 32, and generate alternating current.

[0033] In the embodiment of the present application, the first frictional woven yarn 31 and the second frictional woven yarn 32 are both continuous structures, and the contact part of the first frictional woven yarn 31 and the second frictional woven yarn 32 has different frictional electrode sequences.

[0034] In the embodiment of the present application, the outer braid layer 2 is formed by interlacing at least three frictional braiding yarns 3 to form a plurality of helical braiding structure power generation units 4, but is not limited to three, and can be four, five, six, etc., which can be flexibly adjusted according to actual needs. The more the number of frictional braiding yarns 3, the greater the number of helical braiding chains 42, the more dense the helical lines, and the shorter the length of parallel yarns 41 between adjacent main chains.

[0035] In the embodiment of the present application, the helical braiding chain 42 is a continuous braiding intersection in the form of a helical chain formed between adjacent two yarns during the braiding process. The continuous braiding intersection forms a protruding helical braiding chain 42 wrapped around the surface of the core yarn 1 due to interlacing, and the adjacent helical braiding chains 42 are parallel yarns 41 arranged closely.

[0036] Further, please refer to Figure 1 and Figure 2 , the first frictional braiding yarn 31 is a flexible conductive yarn (as the only single electrode), and the second frictional braiding yarn 32 is a dielectric fiber material. Optionally, the first frictional braiding yarn 31 includes at least one of a silver-plated conductive yarn, a silver fiber, a graphene fiber, and a carbon fiber; and the second frictional braiding yarn 32 includes at least one of a polyamide filament, polyester, cotton, and wool.

[0037] Further, please refer to Figure 1 and Figure 2 , the first frictional braiding yarn 31 is a silver-plated conductive yarn as a negative friction material, and the second frictional braiding yarn 32 is a polyamide filament as a positive friction material.

[0038] In the embodiment of the present application, please refer to Figure 3 , the silver-plated conductive yarn is a polyamide conductive yarn prepared by coating a silver coating 312 on the outer surface of a polyamide filament 311.

[0039] In the embodiment, please refer to Figure 1 and Figure 2 , the outer braid layer 2 is formed by interlacing three frictional braiding yarns 3, and the three frictional braiding yarns 3 include one first frictional braiding yarn 31 and two second frictional braiding yarns 32.

[0040] It should be noted that by stretching the stretchable textile-based friction nanogenerator based on the tubular spiral woven structure by external force, the parallel yarns 41 formed in each spiral woven structure power generation unit 4, i.e., the first friction woven yarn 31 and the second friction woven yarn 32, perform a mutual separation movement; when the external force is removed, under the elastic force of the stretchable textile-based friction nanogenerator based on the tubular spiral woven structure, the first friction woven yarn 31 and the second friction woven yarn 32 perform a mutual contact movement, and the periodic stretching and recovery will generate a periodic contact separation, resulting in a charge flow between the induced electrode of the first friction woven yarn 31 and the ground, and an external output of an alternating pulse electrical signal

[0041] In order to better understand the present application, the following will be combined with the accompanying Figure 4 The working principle of the stretchable textile-based friction nanogenerator based on the tubular spiral woven structure involved in the embodiments of the present application will be further described:

[0042] Figure 4 The power generation principle diagram of the stretchable textile-based friction nanogenerator based on the tubular spiral woven structure provided by an exemplary embodiment of the present application is shown. The working mode of the stretchable textile-based friction nanogenerator based on the tubular spiral woven structure is a single electrode mode, which has only one electrode as an electrical output end, i.e., the first friction woven yarn 31 (i.e., a polyamide conductive yarn, which is also a negative friction material), and the electrode is connected to the ground, which serves as another electrode, i.e., a reference electrode of potential.

[0043] Before stretching, as shown in Figure 3 , a first friction woven yarn 31 and two second friction woven yarns 32 are arranged in parallel between two spiral woven chains 42, in a close contact state, each carrying an equal amount of positive and negative charges; due to the different triboelectric sequences of the first friction woven yarn 31 and the second friction woven yarn 32, the difference in electron-capturing ability between the two is large, and based on the contact electrification effect, two friction layer surfaces will each generate an equal amount of positive and negative charges, with the material that easily captures electrons being negatively charged and the material that easily loses electrons being positively charged; therefore, the first friction woven yarn 31 is more likely to capture electrons and be negatively charged, and the second friction woven yarn 32 is more likely to lose electrons and be positively charged.

[0044] After stretching, the whole outer braid layer 2 is deformed, the spiral braid chain 42 is gradually stretched, the parallel yarns 41 between the spiral braid chains 42, i.e. one first frictional braid yarn 31 and two second frictional braid yarns 32, are still arranged in parallel but gradually separated, and the charges on the material surface are also separated. Due to electrostatic induction, the electric field around the electrode changes, the potential of the electrode (the first frictional braid yarn 31) is affected, and a potential difference is formed between the electrode and the ground surface, driving the electrons to migrate from the surface layer of the electrode PA conducting wire to the ground surface through the external circuit, generating an electric current; when the external force is removed, the first frictional braid yarn 31 and the second frictional braid yarn 32 gradually approach each other in the process of gradual recovery of the device, and the local electric field distribution gradually returns to the initial state, resulting in a change in the potential of the electrode, a potential difference between the surface of the electrode and the ground surface driving the return flow of electrons, migrating from the ground surface to the surface layer of the electrode through the external circuit, generating a reverse current; finally, it returns to the initial state and reaches potential balance; this continuous stretching and reciprocating motion process is accompanied by the process of generating alternating current.

[0045] Effect verification:

[0046] A polyamide conductive yarn was selected as the only electrode of the above-mentioned stretchable textile-based frictional nanometer generator based on a tubular spiral braid structure, and also as a negative friction material, two polyamide filaments were selected as positive friction materials, and a rubber tube was selected as a core yarn.

[0047] A stretchable textile-based frictional nanometer generator device based on a tubular spiral braid structure was prepared by using a braiding machine. The polyamide conductive yarn was led out through a wire, and the electrical signal could be measured. A periodic tensile force was applied in the length direction of the device, and an electrical signal could be generated.

[0048] The electrostatic meter (Keithley-6514 system) was used to test the electrical output performance of the device at maximum stretching rates of 20%, 40%, 60%, 80% and 100%, including open circuit voltage, charge and current. The test speed was 0.1 m / s, the acceleration was 1 m / s2, and the test length was 5 cm.

[0049] The test results show that the maximum values of current, charge and voltage increase with the increase of the maximum stretching rate, because the separation distance between the polyamide conductive yarn and the polyamide filaments increases with the increase of the maximum stretching rate, and the electrical output is greater. When the maximum stretching rate is 20%, the voltage is 0.104 V, the current is 0.023 nA, and the charge is 0.037 nC; when the stretching rate is 100%, the voltage is 0.7 V, the short-circuit current is 0.199 nA, and the charge is 0.259 nC.

[0050] In summary, the stretchable textile-based triboelectric nanogenerator based on a tubular spiral braided structure provided in this application can be used as a stretching sensor or a bending sensor, applied to self-powered light cord control switches, real-time detection and early warning systems for cribs, and self-counting yoga elastic cords. It can also be used as yarn to prepare clothing fabrics, applied to various variable or stretchable parts of clothing, to monitor human movement and frequency, and has good wearability performance.

[0051] Example 2:

[0052] The structure of the stretchable textile-based triboelectric nanogenerator based on the tubular spiral braiding structure provided in this embodiment is basically the same as that in Embodiment 1. The difference is that the outer braiding layer 2 in this embodiment is formed by three triboelectric braiding yarns 3 intertwined and woven together. The three triboelectric braiding yarns 3 include two first triboelectric braiding yarns 31 and one second triboelectric braiding yarn 32.

[0053] Effect verification:

[0054] Two polyamide conductive yarns were selected as the sole electrodes of the stretchable textile-based triboelectric nanogenerator based on the tubular spiral braided structure, which also served as negative friction materials. One polyamide filament was selected as the positive friction material, and a rubber tube was selected as the core yarn.

[0055] A stretchable textile-based triboelectric nanogenerator based on a tubular helical braided structure was fabricated using a braiding machine. Electrical signals can be measured by leading out polyamide conductive yarn through wires, and electrical signals can be generated by applying periodic tension along the length of the device.

[0056] The electrical output performance of the device was tested using an electrometer (Keithley-6514 system) at maximum elongation of 20%, 40%, 60%, 80%, and 100%, including open-circuit voltage, charge, and current. The test speed was 0.1 m / s and the acceleration was 1 m / s². 2 The test length is 5cm.

[0057] The test results show that the maximum values of the current, the electric quantity and the voltage all increase with the increase of the maximum elongation, because the separation distance between the polyamide conductive yarn and the polyamide filament increases with the increase of the maximum elongation, and the electric output is greater. When the elongation is 100%, the voltage is 0.51 V, the short-circuit current is 0.155 nA, and the electric quantity is 0.178 nC. Compared with the test results of Example 1, the electric output performance of Example 2 is a little smaller. This is because, although the contact areas of the first frictional braided yarn 31 and the second frictional braided yarn 32 are the same for each spiral braided structure power generation unit 4 cycle, the diameter of the first frictional braided yarn 31 is thicker than that of the second frictional braided yarn 32, the diameter of the second frictional braided yarn 32 is about 0.4 mm, and the diameter of the first frictional braided yarn 31 is about 0.52 mm. Under the premise that the lengths of the two devices are the same, the more the number of the second frictional braided yarn 32, the more the total number of the parallel yarns 41 between the main chains. Therefore, compared with the first frictional braided yarn 31 and the second frictional braided yarn 32 of Example 1, the total contact area is larger, and the output is higher.

[0058] In summary, the present application utilizes the large deformability of the tubular spiral braided structure and the elastic recovery performance of the elastic core yarn to realize the super-elasticity and high flexibility of the stretchable textile-based frictional nanometer generator based on the tubular spiral braided structure; by stretching and recovering, the electric signal can be generated by the contact and separation of the first frictional braided yarn and the second frictional braided yarn, without relying on friction or contact separation with other materials; by applying external forces such as touching and pressing, an electric signal can also be generated, which improves the stretchable performance of the textile-based frictional nanometer generator, simplifies the device structure, and has a simple preparation method, which can be mass-produced by using existing equipment, reduces the types of materials used, and the materials used are generally easy to obtain, greatly reducing the processing cost and material cost.

[0059] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A stretchable textile-based triboelectric nanogenerator based on a tubular helical braided structure, characterized in that, It includes a core yarn and an outer braided layer located on the outer periphery of the core yarn. The outer braided layer is formed by three friction braided yarns intertwined to form several spiral braided structure power generation units. Each spiral braided structure power generation unit includes at least three parallel yarns and two spiral braided chains. The core yarn is a rubber tube, and the friction braided yarn includes a first friction braided yarn and a second friction braided yarn with different friction polarities. The outer braided layer is formed by intertwining three friction braided yarns, the three friction braided yarns including one first friction braided yarn and two second friction braided yarns; or, the three friction braided yarns including two first friction braided yarns and one second friction braided yarn. The spiral braided chain is a continuous braiding intersection point formed by the interlacing of two adjacent yarns during the braiding process. The continuous braiding intersection points form a spiral braided chain that protrudes and wraps around the surface of the core yarn due to the interlacing, while the adjacent spiral braided chains are closely arranged parallel yarns.

2. The stretchable textile-based triboelectric nanogenerator based on a tubular helical braided structure according to claim 1, characterized in that, The first friction-woven yarn is a flexible conductive yarn, and the second friction-woven yarn is a dielectric fiber material.

3. The stretchable textile-based triboelectric nanogenerator based on a tubular helical braided structure according to claim 2, characterized in that, The first friction-woven yarn includes at least one of silver-plated conductive yarn, silver fiber, graphene fiber, and carbon fiber; the second friction-woven yarn includes at least one of polyamide filament, polyester, cotton, and wool.

4. The stretchable textile-based triboelectric nanogenerator based on a tubular helical braided structure according to claim 3, characterized in that, The first friction-woven yarn is made of silver-plated conductive yarn as a negative friction material, and the second friction-woven yarn is made of polyamide filament as a positive friction material.

5. The stretchable textile-based triboelectric nanogenerator based on a tubular helical braided structure according to claim 4, characterized in that, The silver-plated conductive yarn is a polyamide conductive yarn prepared by coating the outer surface of polyamide filaments with a silver coating.

Images