CN115051591A - Flexible self-driven sensing fiber based on solid-liquid friction power generation and preparation and application thereof - Google Patents

Flexible self-driven sensing fiber based on solid-liquid friction power generation and preparation and application thereof Download PDF

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CN115051591A
CN115051591A CN202210511213.5A CN202210511213A CN115051591A CN 115051591 A CN115051591 A CN 115051591A CN 202210511213 A CN202210511213 A CN 202210511213A CN 115051591 A CN115051591 A CN 115051591A
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fiber
hollow polymer
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flexible self
sensing fiber
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李耀刚
吴耐言
龚维
陆可薇
侯成义
王宏志
张青红
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Donghua University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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    • A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
    • A—HUMAN NECESSITIES
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    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
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    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means

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Abstract

The invention relates to a flexible self-driven sensing fiber based on solid-liquid friction power generation, and preparation and application thereof. The invention realizes the continuous preparation of the flexible self-driven multifunctional sensing fiber, endows the magnetic fluid material sensitive to various environments with multifunctional real-time monitoring capability, and has good application prospect in the field of self-driven multifunctional sensing.

Description

Flexible self-driven sensing fiber based on solid-liquid friction power generation and preparation and application thereof
Technical Field
The invention belongs to the field of sensors and preparation and application thereof, and particularly relates to a flexible self-driven sensing fiber based on solid-liquid friction power generation and preparation and application thereof.
Background
With the coming of the information era and the rapid development of science and technology, sensing equipment with various functions is widely applied to production and life, the sensing equipment used by people in daily life is more and more prone to miniaturization and convenience, wearable sensing equipment is also produced, and the wearable sensing equipment has wide application prospects in the fields of health monitoring, environment monitoring, danger early warning, industrial safety and the like. However, most wireless sensors still use traditional batteries to supply power, which requires frequent replacement of batteries, and the maintenance cost is high, and the waste batteries also cause certain pollution to the environment. Therefore, a multifunctional self-driven sensing device which is pollution-free, good in fitting degree and telescopic is needed.
Self-driven sensing is a novel sensing mode which does not need external power supply and obtains energy from the environment for self-power supply, and a new solution is provided for the power supply problem of wearable sensors. The friction nano generator is used as a mechanical energy collecting device, on one hand, mechanical energy in various forms can be collected and converted into electric energy to drive other electronic components; on the other hand, the sensor can be used as a self-driven sensor by utilizing the sensitive characteristic of the sensor to environmental disturbance, so that the sensor is attracted by attention in the field of intelligent wearable sensing. Through development for many years, scientific research personnel develop various self-powered sensing equipment based on a friction Nano generator and successfully apply the self-powered sensing equipment to the fields of motion sensing, position sensing, ion concentration detection, environment monitoring, pressure sensing, gas detection and the like [ Nano Energy,2020,72: 237-. However, these devices have limited sensing and deformation capabilities, and cannot achieve multi-functional sensing of multiple scenes. Meanwhile, the traditional solid-solid interface friction nano generator has a series of problems of poor circulation stability, short service life, poor output performance and the like, and the requirement for rapid development of intelligent wearable sensing equipment is difficult to meet. In conclusion, a flexible self-driven multifunctional sensing device based on solid-liquid triboelectrification, which can be continuously prepared, is a research hotspot which is urgently needed and is not developed yet.
Disclosure of Invention
The invention aims to solve the technical problem of providing a flexible self-driven sensing fiber based on solid-liquid friction power generation and preparation and application thereof, and overcoming the defects of single sensing mode, poor stability, strong electromagnetic shielding and low electric output performance of a fiber sensing device in the prior art.
The invention relates to a flexible self-driven sensing fiber, which comprises a flexible stretchable electrode skin layer and a solid-liquid interface friction electric core layer;
wherein the flexible stretchable electrode skin is a conductive ionic hydrogel electrode;
the solid-liquid interface friction cell layer comprises water-based magnetofluid and hollow polymer fibers with hydrophobic inner walls. The structure is shown in the attached figure 1a in the specification.
The ionic hydrogel electrode material contains chloride salt; wherein the chloride salt is sodium chloride NaCl, potassium chloride KCl, magnesium chloride MgCl 2 Calcium chloride CaCl 2 One or more of them.
The flexible stretchable electrode is an ionic hydrogel electrode, the conductivity is regulated by adding chloride, and a proper value with both conductivity and weak electromagnetic shielding performance is selected, so that the electrical output performance of the multifunctional sensing fiber reaches the maximum value. The ionic conductivity of the gel is improved along with the increase of the concentration of conductive ions in the gel, and the ionic conductivity is selected from sodium chloride (NaCl), potassium chloride (KCl) and magnesium chloride (MgCl) 2 ) Calcium chloride (CaCl) 2 ) One or more of (a). Different ionic compounds have different suitable values for both electrical conductivity and weak electromagnetic shielding properties.
The water-based magnetic fluid is arranged in the hollow polymer fiber with the hydrophobic inner wall.
The polymer fiber pipe with the hydrophobic inner wall is a hollow polymer fiber pipe, and the inner wall of the hollow polymer fiber pipe is provided with a hydrophobic layer; the hollow polymer fiber material is one or more of polyvinylidene fluoride trifluoroethylene copolymer P (VDF-TrFE), Silicone, polystyrene PS, polylactic acid PLA, polyamide 6PA6 and polyurethane PU.
The solid-liquid interface friction electric core layer comprises a water-based magnetofluid and hollow polymer fibers with inner walls subjected to hydrophobic treatment, wherein a polymer fiber material needs to be matched with the friction polarity of the water-based magnetofluid to improve the signal-to-noise ratio of a friction electric signal between solid-liquid friction electric layers, and the polymer fiber material is selected from one or more of polyvinylidene fluoride trifluoroethylene copolymer (P (VDF-TrFE)), Silicone rubber (Silicone), Polystyrene (PS), polylactic acid (PLA), polyamide 6(PA6) and Polyurethane (PU) according to the friction sequence of the friction electric material; the water delivery coating can effectively avoid the adhesion of the magnetic fluid and the inner wall of the hollow polymer fiber, and is used for improving the stability and the electric output performance of the solid-liquid interface triboelectric fiber.
The flexible self-driven multifunctional sensing fiber is characterized by comprising the following components in parts by weight: under the action of a magnetic field, a sound field, an electric field, stretching, vibration and the like, the water-based magnetic fluid changes in form, and the phenomena of protrusion, aggregation, sliding and the like occur, so that the water-based magnetic fluid and the inner wall of the hydrophobic hollow polymer fiber generate a friction electrification effect, and an electric signal is generated.
The electric signal testing method of the flexible self-driven multifunctional sensing fiber is characterized in that the flexible self-driven multifunctional sensing fiber is fixed on one side of a linear motor, a fixed magnet is used on the other side of the linear motor to carry out controlled reciprocating motion, the distance between a sensor and the magnet is changed, the motion speed and the displacement of the magnet are recorded, and an electric testing device is connected with an ionic hydrogel electrode of the sensing fiber and used for recording electric data. Wherein velocity, displacement, electrical and optical signals can be simultaneously transmitted to a computer and plotted in real time.
The multifunctional sensing characteristic is that the fiber can generate electric signals in the process of being subjected to magnetic field, sound field, electric field, stretching and vibrating, and can be applied to environment detection and action definition. The method specifically comprises the following steps: when the fiber is close to a magnetic field, a sound field and an electric field, the electrical output signal of the fiber is enhanced along with the reduction of the distance or the increase of the field intensity; when the fiber is under the action of stretching, vibration and other forces, the electrical output signal of the fiber is enhanced along with the increase of the acting force.
A continuous preparation method of flexible self-driven multifunctional sensing fibers based on solid-liquid friction power generation comprises the following steps: preparing polymer fibers with hydrophobic inner walls by an optimized impregnation method; and (3) preparing the flexible stretchable electrode skin layer by an improved soft mold method. The preparation process is shown in figure 1d in the specification.
The invention discloses a preparation method of a flexible self-driven sensing fiber, which comprises the following steps:
(1) injecting water-based magnetic fluid into the hollow polymer fiber with the hydrophobic inner wall, and sealing to obtain a triboelectric core layer of a solid-liquid interface;
(2) and carrying out plasma treatment on the triboelectric core layer of the solid-liquid interface, then sleeving a hollow hose mold with the diameter larger than that of the triboelectric core layer outside, enabling a gap to exist between the triboelectric core layer and the hose mold, then filling the gap with liquid ionic hydrogel, curing, and stripping the hose mold to obtain the flexible self-driven sensing fiber.
The preferred mode of the above preparation method is as follows:
the hollow polymer fiber having a hydrophobic inner wall in the step (1) is prepared by a method comprising: carrying out plasma treatment on hollow polymer fibers, then sealing one end of each fiber, filling silicon-based super-hydrophobic coating stock solution with the mass percentage concentration of 50% -100%, pouring out the soaked solution, drying the soaked solution, filling acidic perfluorodecyl trimethoxy silane ethanol solution with the mass percentage concentration of 2% -5%, pouring out the soaked solution, and drying the soaked solution to obtain the polymer fibers with hydrophobic inner walls.
The plasma treatment time is 8-20 min; the sealing is hot melt adhesive sealing; the dipping time is 10-30 s; the drying is carried out for 3-8min at 50-70 ℃.
And (2) injecting water-based magnetic fluid with the volume of 40-90% into the hollow polymer fiber with the hydrophobic inner wall in the step (1).
The ionic hydrogel in the liquid state in the step (2) comprises the following components:
the proportion of water, glycol, chloride salt, N '-methylene bisacrylamide, acrylamide, tannic acid and 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone is 5-8 mL: 2-5 mL: 0.5-2.5 g: 0.005-0.015 g: 1.5-2.5 g: 0.01-0.02 g: 0.05-0.15 g.
Taking 10mL of ionic hydrogel solution as an example, 5-8mL of deionized water, 2-5mL of ethylene glycol, 0.5-2.5g of chloride salt, 0.005-0.015g of N, N '-methylenebisacrylamide, 1.5-2.5g of acrylamide, 0.01-0.02g of tannic acid, and 0.05-0.15g of 2-hydroxy-4' - (2-hydroxyethoxy) -2-methylpropiophenone.
The plasma treatment time in the step (2) is 8-20 min; the curing ultraviolet curing is carried out for 10-20min, and the ultraviolet power is 40-60 kw.
The invention provides application of the flexible self-driven sensing fiber in magnetic field monitoring, noise monitoring, pulse detection and intelligent wearable human-computer interaction.
Further, application scenarios include the following as (1) magnetic field monitoring: the sensitivity to the magnetic field can generate an electric signal to trigger an alarm when the strong magnetic field is approached; (2) noise monitoring: the sound field sensitivity can generate an electric signal to trigger an alarm when the noise decibel is too high; (3) pulse detection: the health bracelet can be made according to the flexibility of the health bracelet, and the real-time tracking detection of human pulse is realized by sending out electric signals by sensing pulse vibration; (4) wearable human-computer interaction of intelligence: the multifunctional sensing fiber is integrated with clothes, and different electric signals generated by the sensor based on different actions of a human body are used for reading and controlling the electronic port.
The flexible multifunctional sensing fiber of the invention comprises: flexible stretchable electrode skin and solid-liquid interface triboelectric core layer. The flexible stretchable electrode skin layer is composed of ionic hydrogel, and the solid-liquid interface friction electric core layer is composed of water-based magnetic fluid and a polymer fiber tube with the inner wall subjected to hydrophobic treatment. Under the action of magnetic field, sound field, electric field, stretching, vibration and the like, the water-based magnetic fluid changes in form, and the phenomena of protrusion, aggregation, sliding and the like occur, so that the frictional electrification effect occurs between the water-based magnetic fluid and the hydrophobic polymer fiber pipe wall, and an electric signal is generated, and the water-based magnetic fluid can be used for a multifunctional sensing device. The invention is based on the water-based magnetofluid and the hollow polymer fiber material, adopts an optimized dipping method and an improved soft mold method, realizes the continuous preparation of the flexible self-driven multifunctional sensing fiber, endows the magnetofluid material sensitive to various environments with multifunctional real-time monitoring capability, and has good application prospect in the field of self-driven multifunctional sensing.
Advantageous effects
The invention is based on water-based magnetofluid and hollow polymer fiber materials, and based on an optimized dipping method and an improved soft mold method, prepares a continuous flexible self-driven multifunctional sensing fiber, has a novel magnetic-electric sensing mode, and can be used for high-precision environmental monitoring. The magnetic fluid material sensitive to various environmental sources has multifunctional real-time monitoring capability, and has good application prospect in the field of self-driven sensing.
Drawings
FIG. 1 is a schematic diagram of preparation of a flexible self-driven multifunctional sensing fiber based on solid-liquid triboelectrification. (a) The structure schematic diagram of the flexible self-driven multifunctional sensing fiber; (b) a flexible stretchable electrode skin layer object picture prepared by an improved soft mold method; (c) optimizing a hollow polymer fiber object diagram with a hydrophobic inner wall prepared by an impregnation method; (d) a flow chart for preparing the flexible self-driven multifunctional sensing fiber.
Figure 2 hollow polymer fibers with hydrophobic inner walls and flexible stretchable electrode skin characterization test in example 1. (a) SEM picture of the inner wall of the polymer fiber after water delivery treatment; (b) testing the contact angle of the inner wall of the hollow polymer fiber after water delivery treatment; (c) a cross-sectional view of a flexible stretchable electrode wrapped around a hollow polymer fiber; (d) and (3) testing the tensile property of the flexible stretchable electrode at different stretching speeds.
FIG. 3 shows the electrical output performance test of the multifunctional sensing fiber prepared by different electrode materials (hydrogel, copper wire, conductive yarn and silver wire). (a) Testing the output current; (b) outputting a charge test; (c) and (5) testing the output voltage.
FIG. 4 shows the electrical output performance test of the flexible self-driven multifunctional sensing fiber for solid-liquid friction power generation under different magnetic field strengths. (a) Testing the output current; (b) outputting a charge test; (c) and (5) testing the output voltage.
FIG. 5 shows the electrical output performance test of the flexible self-driven multifunctional sensing fiber generated by the magnetic field and the solid-liquid friction under different distances. (a) Testing the output current; (b) outputting a charge test; (c) and (5) testing the output voltage.
FIG. 6 shows the electrical output performance test of the solid-liquid triboelectrification flexible self-driven multifunctional sensing fiber prepared by the ionic hydrogel electrode with different sodium chloride concentrations. (a) Testing the output current; (b) outputting a charge test; (c) and (6) testing the output voltage.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims. Sources of raw materials and reagents in the examples: silicone rubber tube (55A hardness, lukefluid), water-based magnetofluid (440 Gauss saturation magnetization, Inkking nanometer magnetofluid), 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone (molecular weight M) w 224.25, alatin reagent), N' -methylenebisacrylamide (molecular weight M) w 54.17, alatin reagent), tannic acid (molecular weight M) w 701.2, avastin reagent), perfluorodecyltrimethoxysilane (molecular weight M) w 568.3 dark blue reagent), silicon-based superhydrophobic coating (zimley technologies, ltd.), acrylamide (analytical, titan technologies), ethylene glycol (analytical, mclin biochemistry technologies, ltd.), sodium chloride (analytical, hun test).
The electrical output performance of the flexible self-driven multifunctional sensing fiber based on solid-liquid friction power generation is tested by adopting a Gishili 6514A, and the magnetic field strength is tested by using a Gaussmeter DX-102F.
Example 1
Preparing polymer fiber with hydrophobic inner wall by adopting an impregnation method, firstly carrying out plasma treatment on hollow polymer fiber (8min), then sealing one end of the fiber by using hot melt adhesive, filling up silicon-based super-hydrophobic coating stock solution with the concentration of 100%, pouring out after impregnating for a period of time (10s), putting into a 70 ℃ drying oven for drying (3min), then filling up acidic perfluorodecyl trimethoxy silane ethanol solution with the concentration of 2%, pouring out after impregnating for a period of time (10s)And putting the hollow fiber into a 70 ℃ oven for drying (3min) to obtain a polymer fiber tube with a hydrophobic inner wall, finally injecting water-based magnetic fluid with the volume of about 60% into the hollow fiber, and sealing by using hot melt adhesive to obtain the triboelectric core layer of the solid-liquid interface. 7mL of deionized water and 3mL of ethylene glycol are mixed, and 1.0g of sodium chloride, 0.01g of N, N '-methylene bisacrylamide, 2.13g of acrylamide, 0.015g of tannic acid and 0.1g of 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone are added to prepare an ionic hydrogel solution. Preparing a flexible stretchable electrode skin layer by adopting a soft die method, carrying out plasma treatment on a triboelectric core layer of a solid-liquid interface (8min), then sleeving a hollow hose die with the diameter larger than that of the triboelectric core layer outside, enabling a certain gap to exist between the triboelectric core layer and the hose die, then filling liquid ionic hydrogel into the gap, then placing the hollow hose die into an ultraviolet curing box (60kw) for ultraviolet curing (10min), and finally peeling off the hose die to obtain the flexible stretchable electrode skin layer. The prepared multifunctional sensing fiber is subjected to electrical signal test according to an electrical signal test method of the flexible self-driven multifunctional sensing fiber in the specification, the distance between the fiber and a magnetic field is controlled to be 5mm, the magnetic field intensity is controlled to be 2.5KG, the electrode materials are respectively a sodium chloride hydrogel electrode, a copper wire, a conductive yarn and a silver wire, and electrical signals of the electrode materials are shown in figure 3. The current output of the multifunctional sensing fiber prepared by the sodium chloride hydrogel electrode reaches 80 MuA/m 2 The charge output reaches 0.05nC, the voltage output reaches 0.3V, and the performance of the multifunctional sensing fiber prepared by the multifunctional sensing fiber is greatly improved compared with that of the multifunctional sensing fiber prepared by other traditional electrode materials.
Example 2
Preparing hollow polymer fiber with hydrophobic inner wall by adopting an impregnation method, firstly carrying out plasma treatment on the hollow polymer fiber (10min), then sealing one end of the fiber by using hot melt adhesive, filling silicon-based super-hydrophobic coating stock solution with the concentration of 50%, pouring out after impregnating for a period of time (15s), putting into a 65 ℃ drying oven for drying (4min), then filling acidic perfluorodecyl trimethoxy silane ethanol solution with the concentration of 3%, pouring out after impregnating for a period of time (15s), putting into a 65 ℃ drying oven for drying (4min), obtaining a hollow polymer fiber tube with hydrophobic inner wall, and finally pouring water with the volume of about 40% into the hollow fiberAnd (3) sealing the basic magnetic fluid by using hot melt adhesive to obtain the triboelectric core layer of the solid-liquid interface. 5mL of deionized water and 5mL of ethylene glycol are mixed, and 1.0g of sodium chloride, 0.005g of N, N '-methylene bisacrylamide, 1.5g of acrylamide, 0.01g of tannic acid and 0.05g of 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone are added to prepare an ionic hydrogel solution. Preparing a flexible stretchable electrode skin by adopting a soft die method, carrying out plasma treatment (10min) on a triboelectric core layer of a solid-liquid interface, then sleeving a hollow hose die with the diameter larger than that of the triboelectric core layer outside, enabling a certain gap to exist between the triboelectric core layer and the hose die, filling liquid ionic hydrogel into the gap, then placing the hollow hose die into an ultraviolet curing box (50kw) for ultraviolet curing (12min), and finally peeling off the hose die to obtain the flexible stretchable electrode skin. The prepared multifunctional sensing fiber is subjected to electrical signal test according to an electrical signal test method of the flexible self-driven multifunctional sensing fiber in the specification, the distance between the fiber and a magnetic field is controlled to be 5mm, the sodium chloride concentration of a hydrogel electrode is controlled to be 0.1g/ml, the magnetic field strength is respectively 0.5KG, 1.5KG and 2.5KG, and electrical signals are shown in figure 4. The electrical output performance of the multifunctional sensing fiber is enhanced along with the increase of the magnetic field intensity, and when the magnetic field intensity is 2.5KG, the output current of the multifunctional sensing fiber is 120 mu A/m 2 The output charge is 0.2nC, the output voltage is 0.45V, and the characteristic that the multifunctional sensing fiber is sensitive to the magnetic field intensity is shown.
Example 3
The preparation method comprises the steps of preparing the hollow polymer fiber with the hydrophobic inner wall by adopting an impregnation method, firstly carrying out plasma treatment on the hollow polymer fiber (14min), then sealing one end of the fiber by using a hot melt adhesive, filling up a silicon-based super-hydrophobic coating stock solution with the concentration of 70%, pouring out after impregnating for a period of time (20s), putting into a 60 ℃ drying oven for drying (5min), then filling up an acidic perfluorodecyl trimethoxy silane ethanol solution with the concentration of 4%, pouring out after impregnating for a period of time (20s), putting into a 60 ℃ drying oven for drying (5min), obtaining the hollow polymer fiber with the hydrophobic inner wall, finally injecting a water-based magnetofluid with the volume of about 70% into the hollow fiber, and sealing by using the hot melt adhesive to obtain the triboelectric core layer of a solid-liquid interface. Taking 6mL of deionized water and4mL of ethylene glycol are mixed, and 1.0g of sodium chloride, 0.008g of N, N '-methylenebisacrylamide, 1.8g of acrylamide, 0.013g of tannic acid and 0.08g of 2-hydroxy-4' - (2-hydroxyethoxy) -2-methylpropiophenone are added to prepare an ionic hydrogel solution. Preparing a flexible stretchable electrode skin layer by adopting a soft die method, carrying out plasma treatment on a triboelectric core layer of a solid-liquid interface (14min), then sleeving a hollow hose die with the diameter larger than that of the triboelectric core layer outside, enabling a certain gap to exist between the triboelectric core layer and the hose die, then filling liquid ionic hydrogel into the gap, then placing the hollow hose die into an ultraviolet curing box (50kw) for ultraviolet curing (15min), and finally peeling off the hose die to obtain the flexible stretchable electrode skin layer. The prepared multifunctional sensing fiber is subjected to electrical signal test according to an electrical signal test method of the flexible self-driven multifunctional sensing fiber in the specification, the sodium chloride concentration of the hydrogel electrode is controlled to be 0.1g/ml, the magnetic field strength is controlled to be 2.5KG, the distances between the fiber and the magnetic field are respectively 5mm, 10mm, 15mm, 20mm and 25mm, and electrical signals of the multifunctional sensing fiber are shown in figure 5. The electrical output performance of the multifunctional sensing fiber is enhanced as the distance between the multifunctional sensing fiber and the magnetic field with constant magnetic field intensity is reduced, and the output current of the multifunctional sensing fiber is 75 muA/m when the distance between the multifunctional sensing fiber and the magnetic field is 5mm 2 The output charge is 0.055nC, the output voltage is 0.3V, and the multifunctional sensing fiber shows the characteristic of being sensitive to the distance magnetic field between the multifunctional sensing fiber and the magnetic field.
Example 4
The preparation method comprises the steps of preparing hollow polymer fibers with hydrophobic inner walls by adopting a dipping method, firstly carrying out plasma treatment on the hollow polymer fibers (20min), then sealing one ends of the fibers by using hot melt adhesive, filling up silicon-based super-hydrophobic coating stock solution with the concentration of 90%, pouring out after dipping for a period of time (30s), putting into a 50 ℃ drying oven to dry (8min), then filling up acidic perfluorodecyl trimethoxy silane ethanol solution with the concentration of 5%, pouring out after dipping for a period of time (30s), putting into a 50 ℃ drying oven to dry (8min), obtaining the hollow polymer fibers with hydrophobic inner walls, finally filling water-based magnetofluid with the volume of about 90% into the hollow fibers, and sealing by using the hot melt adhesive to obtain the triboelectric core layer of a solid-liquid interface. Mixing 9mL of deionized water with 1mL of ethylene glycol, and respectively adding0.5g, 1.0g, 1.5g and 2.0g of sodium chloride are added, and then 0.015g of N, N '-methylene bisacrylamide, 2.5g of acrylamide, 0.02g of tannic acid and 0.015g of 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone are respectively added to prepare different sodium chloride ion hydrogel solutions. Preparing a flexible stretchable electrode skin layer by adopting a soft die method, carrying out plasma treatment on a triboelectric core layer of a solid-liquid interface (20min), then sleeving a hollow hose die with the diameter larger than that of the triboelectric core layer outside, enabling a certain gap to exist between the triboelectric core layer and the hose die, then filling liquid ionic hydrogel into the gap, then putting the hollow hose die into an ultraviolet curing box (40kw) for ultraviolet curing (20min), and finally peeling off the hose die to obtain the flexible stretchable electrode skin layer. The prepared multifunctional sensing fiber is subjected to electrical signal test according to an electrical signal test method of the flexible self-driven multifunctional sensing fiber in the specification, the magnetic field intensity is controlled to be 2.5KG, the distance between the fiber and the magnetic field is controlled to be 5mm, the sodium chloride concentration of the hydrogel electrode is respectively 0.05g/ml, 0.10g/ml, 0.15g/ml and 0.20g/ml, and the electrical signal is shown in figure 6. The conductivity of the ionic hydrogel electrode is increased along with the increase of the concentration of sodium chloride, and the electric output performance of the ionic hydrogel electrode is increased and then reduced along with the increase of the concentration of sodium chloride, because the concentration of sodium chloride is increased and the electromagnetic shielding effect of the hydrogel electrode is also enhanced, in order to maximize the electric output performance of the multifunctional sensing fiber, the hydrogel electrode needs to have both conductivity and weak electromagnetic shielding effect by adjusting the proper concentration of sodium chloride, when the concentration of sodium chloride is 0.15g/mL, the electric output performance of the multifunctional sensing fiber is the best, and the output current is 80 muA/m 2 The output charge is 0.07nC, and the output voltage is 0.35V.

Claims (10)

1. The flexible self-driven sensing fiber is characterized by comprising a flexible stretchable electrode skin layer and a solid-liquid interface friction electric core layer;
wherein the flexible stretchable electrode skin is an ionic hydrogel electrode;
the solid-liquid interface friction cell layer comprises water-based magnetofluid and hollow polymer fibers with hydrophobic inner walls.
2. The flexible self-driven sensing fiber according to claim 1, wherein the ionic hydrogel electrode material contains a chloride salt; wherein the chloride salt is sodium chloride NaCl, potassium chloride KCl, magnesium chloride MgCl 2 Calcium chloride CaCl 2 One or more of them.
3. The flexible self-driven sensing fiber according to claim 1, wherein the water-based magnetic fluid is disposed within a hollow polymer fiber having a hydrophobic inner wall.
4. The flexible self-driven sensing fiber according to claim 1, wherein the hollow polymer fiber with hydrophobic inner wall is provided with a hydrophobic layer on the inner wall of the hollow polymer fiber; the hollow polymer fiber material is one or more of polyvinylidene fluoride trifluoroethylene copolymer P (VDF-TrFE), Silicone rubber Silicone, polystyrene PS, polylactic acid PLA, polyamide 6PA6 and polyurethane PU.
5. A preparation method of a flexible self-driven sensing fiber comprises the following steps:
(1) injecting water-based magnetic fluid into the hollow polymer fiber with the hydrophobic inner wall, and sealing to obtain a triboelectric core layer of a solid-liquid interface;
(2) and carrying out plasma treatment on the triboelectric core layer of the solid-liquid interface, then sleeving a hollow hose mold with the diameter larger than that of the triboelectric core layer outside, enabling a gap to exist between the triboelectric core layer and the hose mold, then filling the gap with liquid ionic hydrogel, curing, and stripping the hose mold to obtain the flexible self-driven sensing fiber.
6. The method according to claim 5, wherein the hollow polymer fiber having a hydrophobic inner wall in the step (1) is prepared by a method comprising: carrying out plasma treatment on the hollow polymer fiber, then sealing one end of the fiber, filling up with 50-100% by mass of silicon-based super-hydrophobic coating stock solution, pouring out after dipping, drying, filling up with 2-5% by mass of acidic perfluorodecyl trimethoxy silane ethanol solution, pouring out after dipping, and drying to obtain the hollow polymer fiber with the hydrophobic inner wall.
7. The method according to claim 6, wherein the plasma treatment time is 8-20 min; the sealing is hot melt adhesive sealing; the dipping time is 10-30 s; the drying is carried out for 3-8min at 50-70 ℃.
8. The preparation method according to claim 5, characterized in that in the step (1), the hollow polymer fiber with the hydrophobic inner wall is injected with 40-90% water-based magnetic fluid by volume.
9. The method according to claim 5, wherein the plasma treatment time in the step (2) is 8-20 min; the curing ultraviolet curing is carried out for 10-20min, and the ultraviolet power is 40-60 kw.
10. Use of the flexible self-driven sensor fiber according to claim 1, comprising use in magnetic field monitoring, noise monitoring, pulse detection or smart wearable human-machine interaction.
CN202210511213.5A 2022-05-11 2022-05-11 Flexible self-driven sensing fiber based on solid-liquid friction power generation and preparation and application thereof Pending CN115051591A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115541654A (en) * 2022-11-30 2022-12-30 武汉大学 Device and method for detecting water content of insulating oil of nano generator with oil-solid friction
CN116026372A (en) * 2022-12-06 2023-04-28 西安交通大学 Broadband based on preloading design Flexible dynamic sensor and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115541654A (en) * 2022-11-30 2022-12-30 武汉大学 Device and method for detecting water content of insulating oil of nano generator with oil-solid friction
CN116026372A (en) * 2022-12-06 2023-04-28 西安交通大学 Broadband based on preloading design Flexible dynamic sensor and preparation method thereof
CN116026372B (en) * 2022-12-06 2024-07-09 西安交通大学 Broadband flexible dynamic sensor based on preloaded design and preparation method thereof

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