CN113337924A - Method for preparing flexible sensing material by using interface spinning technology and application thereof - Google Patents
Method for preparing flexible sensing material by using interface spinning technology and application thereof Download PDFInfo
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Classifications
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/18—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from other substances
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/09—Addition of substances to the spinning solution or to the melt for making electroconductive or anti-static filaments
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/02—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from cellulose, cellulose derivatives, or proteins
Abstract
The invention provides a method for preparing a flexible sensing material by using an interface spinning technology, belonging to the technical field of flexible pressure sensors. The invention utilizes an interface spinning technology to prepare a flexible material, adds a conductive nano material into an anion/cation dispersion system to form a stable conductive nano material aqueous dispersion liquid with a stable cation/anion dispersant, then places the two solutions into the same container, gathers the interfaces of the two solutions, extracts an instantaneously formed solid-like anion-cation compound, quickly dries the water in a spun conductive filament, and winds the filament on a reel to prepare the conductive filament. The tensile strength of the prepared conductive wire is 50-100 MPa, the diameter is 30-80 mu m, and the conductivity is 350-3000 s/m. When the material is used as a sensing material to assemble a resistance type stress sensor, the material has the advantages of obvious response current/resistance change, low detection limit and good anti-fatigue stability.
Description
Technical Field
The invention relates to a method for preparing a flexible sensing material by using an interface spinning technology and application thereof, belonging to the technical field of flexible pressure sensors.
Background
The flexible pressure or strain sensor is a flexible electronic device which converts external stimuli such as pressure and tensile strain into electric signals to be output, and is a key component of wearing electronic devices and electronic skins. The most critical technology for manufacturing flexible pressure/strain sensors is the development of new sensing materials. In recent years, sensing materials of various dimensions, such as one-dimensional linear or thread-like sensing materials, two-dimensional thin films or sheet-like sensing materials, three-dimensional aerogels and fiber network materials, have been applied to the manufacture of pressure/strain sensors for detecting large-amplitude stress/strain such as movement of human body, gripping of object, stretching deformation of joint part, and small-amplitude deformation of sensors caused by respiration, sound vibration, pulse beat, etc. In the development of the sensing material, besides improving the flexibility, mechanical property and sensing property of the material, the sensing material which is friendly and comfortable to human skin is developed, and the problem that the development of the flexible sensing material is considered when the environment is not influenced by the abandonment of a flexible electronic device is avoided.
Linear one-dimensional sensor materials have attracted attention because they can be incorporated into yarns or can be directly woven or sewn as yarns into clothing or gloves. For example, the preparation of the linear strain sensing material is realized by loading carbon nano materials such as graphene and carbon nano tubes or metal nano particles such as palladium and silver on the fiber/yarn. The conductive nano material loaded on the yarn is usually dipped or sprayed, the conductive nano particles are mostly distributed on the surface of the yarn, the uniform distribution of the conductive nano material on the yarn is difficult to ensure, and the sensing material often falls off in the cyclic loading/unloading process. The conductive nano material is dispersed in the high molecular polymer and then is dip-coated on the surface of the yarn, and although fixation of the conductive nano material to the yarn is increased, the conductivity which can be obtained by the yarn is very limited. Moreover, the yarns used are generally of synthetic polymers and lack reproducibility and sustainability.
Disclosure of Invention
Aiming at the defects of uneven distribution, low conductivity and poor cycling stability in use of conductive nano materials in the existing linear strain sensing material, the invention provides a method for preparing a flexible sensing material by using an interface spinning technology.
A method for preparing a flexible sensing material by using an interface spinning technology comprises the following steps:
(1) dispersing a cationic natural high molecular polymer in deionized water to obtain a cationic natural high molecular water solution, and mechanically stirring or ultrasonically treating to obtain a cationic dispersant system; dispersing an anionic natural high molecular polymer in deionized water to obtain an anionic natural high molecular solution, and mechanically stirring or ultrasonically treating the anionic natural high molecular solution to obtain an anionic dispersant system;
(2) adding a conductive nano material into a cationic dispersant system, and preparing a conductive nano material aqueous dispersion a stabilized by using a cationic dispersant through mechanical stirring or ultrasonic treatment; adding the conductive nano material into an anionic dispersant system, and preparing a conductive nano material aqueous dispersion b stabilized by using an anionic dispersant through mechanical stirring or ultrasonic treatment;
(3) respectively placing the conductive nano material dispersion liquid a and b in the same container to form a contact interface or a non-contact interface, gathering the interfaces of the conductive material dispersion liquid a and b, extracting the instantly formed solid-like anion-cation compound, quickly drying the moisture in the spun conductive filament, and winding the filament on a reel to prepare the conductive filament.
Wherein, in the cationic dispersant system, the concentration of the cationic natural high molecular polymer is 0.1 to 0.6 weight percent; in the ionic dispersant system, the concentration of anionic natural polymer is 0.1-0.6 wt%; in the conductive nano-material aqueous dispersion a, the concentration of the conductive nano-material is 0-0.4 wt%; in the conductive nano-material aqueous dispersion b, the concentration of the conductive nano-material is 0.1-0.4 wt%.
Wherein the conductive nano material is a carbon nano tube, graphene and metal nano particles; the cation/anion natural high molecular polymer is cation polysaccharide or anion polysaccharide obtained by chemical modification of natural high molecular polymer, or natural high molecular polysaccharide with ionizable groups.
Wherein the natural high molecular polymer is cellulose, starch and guar gum; the natural high molecular polysaccharide with ionizable groups is chitosan and sodium alginate.
Wherein the spinning speed of the conductive yarn is controlled to be 50-300 mm/min.
The flexible sensing material prepared by the method is applied to be used as a strain sensing material, and specifically, a single conductive wire or a plurality of conductive wires are combined into a strand, conductive adhesive tapes are adhered to two ends of the strand, and a lead is introduced to form the strain sensor.
The invention utilizes an interface spinning technology to prepare a flexible material, wherein the interface spinning technology is a spinning technology which utilizes natural high molecular polymers with opposite charges to generate electrostatic neutralization when meeting on an interface to generate an ionic composite reaction to form an ionic composite, namely an anion and cation solid composite, and continuously extracts the anion and cation solid composite from the interface to ensure that natural high molecular polymer molecular chains are longitudinally arranged, thereby obtaining a filamentous material, as shown in figure 1.
The key of the interfacial spinning technology is to form an interface of an anionic high molecular polymer aqueous solution and a cationic high molecular polymer aqueous solution, and when the quasi-solid anionic-cationic compound is continuously extracted from the interface, the anionic natural high molecular polymer can continuously migrate and agglomerate to the interface to form the quasi-solid anionic-cationic compound, so as to ensure that the interfacial spinning can be continuously carried out.
The invention takes conductive nano-materials as fillers, utilizes natural high molecular polymers of anions and cations as dispersing agents and spinning materials of the conductive nano-materials, and prepares the micron conductive yarn with the strain sensing performance by an interface spinning technology.
According to the invention, the cationic natural high molecular polymer aqueous solution containing or not containing the conductive nano material and the anionic natural high molecular polymer aqueous solution containing the conductive nano material are used as interface spinning materials, and the conductive nano material is longitudinally arranged along with the conductive yarn and uniformly distributed in the spun filament by an interface spinning technology, as shown in figure 2, so that the filament is endowed with proper conductivity.
The micron conductive wire prepared by the method has the characteristics of small diameter, high strength, uniform distribution of conductive nano materials and strong conductivity. And the strain sensor is assembled by further using the micron conductive wire as a sensor material, so that the strain sensor has the advantages of simple preparation process, low cost, environmental friendliness and suitability for large-scale production.
The invention also comprises a method for preparing the resistance type strain sensor by using the conductive filament network as a sensing material.
The invention has the beneficial effects
The invention provides a method for preparing a linear strain sensor by using water as a medium, a conductive nano material as a filler, and an anion-cation natural high molecular polymer as a dispersing agent and a spinning material through an interface spinning technology. The micron conductive wire with sensing performance prepared by the method greatly improves the uniformity of the conductive nanometer material in the conductive wire, simplifies the preparation process of the conductive wire, and improves the sustainability of the production of the conductive wire and the biocompatibility of the conductive wire. The tensile strength of the prepared conductive wire is 50-100 MPa, the diameter is 30-80 mu m, and the conductivity is 350-3000 s/m.
The micron conductive wire with the strain sensing effect is prepared by the method, and has the advantages of obvious response current/resistance change, low detection limit and good anti-fatigue stability when being used as a sensing material to be assembled into a resistance type stress sensor.
Drawings
FIG. 1 shows that the interface spinning technology is utilized to prepare the conductive yarn with sensing performance
FIG. 2 SEM image of micron conductive wire
Detailed description of the preferred embodiment
The present invention is further illustrated with reference to the following specific examples, which are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following examples; unless otherwise indicated, the parts described in the examples are parts by mass.
Example 1
Taking 0.6 part of chitosan, dispersing in 99.4 parts of 0.5% acetic acid aqueous solution, and preparing into a chitosan solution with positive charge and concentration of 0.6wt% through mechanical stirring or ultrasonic treatment; dissolving 0.6 part of sodium alginate in 99.4 parts of deionized water, and preparing the solution into a sodium alginate solution with negative charge and the concentration of 0.6wt% through 1 mechanical stirring or ultrasonic treatment.
Adding 0.3 part of single-carbon-wall nanotubes into the prepared chitosan solution, and preparing a carbon nanotube aqueous dispersion with stable chitosan concentration of about 0.3wt% by mechanical stirring or ultrasonic treatment; adding 0.3 part of carbon nano tube into the prepared sodium alginate solution, and preparing the sodium alginate stable carbon nano tube water dispersion solution with the concentration of about 0.3wt% through mechanical stirring or ultrasonic treatment.
Dropping the carbon nano tube dispersion liquid stabilized by using chitosan on a culture dish, dropping the carbon nano tube dispersion liquid stabilized by using sodium alginate on the culture dish close to the droplets, converging the interface of the two droplets by using tweezers, instantly forming solid-like cation and anion compounds by reacting the chitosan with positive charges on the interface with the sodium alginate with negative charges, clamping the carbon nano tube in the carbon nano tube, drawing the cation and anion compounds coated with the carbon nano tube out of the interface to form a micron-scale filament, winding the filament on a winding drum driven by a motor, and controlling the spinning speed of the interface to be about 200 mm/min to obtain the conductive wire with the diameter of about 60 mu m, the tensile strength of 70 MPa and the conductivity of about 2000 s/m.
Connecting two ends of a 3cm single conductive wire with conductive adhesive tapes by using conductive adhesives to a digital source meter, stretching a sensor along the axial direction under a fixed voltage of 1V, wherein the initial current is 40.3 muA, the current is reduced to 37.7 muA when the strain is 1%, and the current is reduced to 23.4 muA when the strain is increased to 8%; and repeatedly applying 2% strain, and stabilizing the current output at about 30.6 muA.
Example 2
Taking 0.4 part of cationic guar gum, dispersing in 99.6 parts of deionized water, and preparing into a cationic guar gum solution with the concentration of 0.4wt% through mechanical stirring or ultrasonic treatment; 0.4 portion of sodium carboxymethylcellulose is dissolved in 99.6 portions of deionized water, and is subjected to 1 mechanical stirring or ultrasonic treatment to prepare a sodium carboxymethylcellulose solution with 0.4wt% of negative charge.
Adding 0.4 part of single-carbon-wall nanotubes into the prepared cationic guar gum solution, and preparing a stable carbon nanotube aqueous dispersion with the concentration of about 0.4wt% of cationic guar gum through mechanical stirring or ultrasonic treatment; 0.4 part of carbon nano tube is added into the prepared sodium carboxymethyl cellulose solution, and the sodium carboxymethyl cellulose stable carbon nano tube water dispersion solution with the concentration of about 0.4wt% is prepared through mechanical stirring or ultrasonic treatment.
Dropping the carbon nanotube dispersion stabilized by using the cationic guar gum on a culture dish, dropping the carbon nanotube dispersion stabilized by using sodium carboxymethylcellulose on the culture dish close to the droplets, gathering the interface of the two droplets by using forceps, instantly forming a solid-like cation-anion complex by reacting the cationic guar gum with the sodium carboxymethylcellulose with negative charges on the interface, clamping the carbon nanotube therein, drawing the cation-anion complex wrapped with the carbon nanotube out of the interface to form a micron-scale filament, winding the filament on a winding drum driven by a motor, and controlling the spinning speed of the interface to be about 100 mm/min to obtain the conductive wire with the diameter of about 80 mu m, the tensile strength of about 50 MPa and the conductivity of about 3000 s/m.
Connecting two ends of a 3cm single conductive wire with conductive tapes by using conductive adhesives to a digital source meter, stretching a sensor along the axial direction under a fixed voltage of 1V, wherein the initial current is 46.1 muA, the current is reduced to 44.3 muA when the strain is 1%, and the current is reduced to 38.4 muA when the strain is increased to 8%; and repeatedly applying 2% of strain, and stabilizing the current output at about 41.7 muA.
Example 3
Taking 0.2 part of cationic guar gum, dispersing in 49.7 parts of deionized water, and preparing into a cationic guar gum solution with the concentration of 0.4wt% through mechanical stirring or ultrasonic treatment; 0.2 part of sodium alginate is dispersed in 49.7 parts of deionized water, and the sodium alginate solution with the concentration of 0.4wt% is obtained after mechanical or ultrasonic treatment.
Adding 0.2 part of graphene into the prepared cationic guar gum solution, and preparing a carbon nanotube aqueous dispersion with stable cationic guar gum concentration of about 0.2wt% by mechanical stirring or ultrasonic treatment; 0.2 part of graphene is added into the prepared anionic potato starch solution, and the graphene aqueous dispersion with stable concentration of about 0.2wt% of anionic potato starch is prepared by mechanical stirring or ultrasonic treatment.
Dropping the graphene dispersion stabilized by using the cationic guar gum on a culture dish, dropping the graphene dispersion stabilized by using the anionic potato starch on the culture dish close to the liquid drop, gathering the interface of the two liquid drops by using a pair of tweezers, instantaneously reacting the cationic guar gum and the anionic potato starch on the interface to form a solid-like anion-cation compound, wrapping the graphene in the solid-like anion-cation compound, drawing the anion-cation compound wrapped with the graphene out of the interface to form a micrometer filament, winding the filament on a winding drum driven by a motor, and controlling the spinning speed of the interface to be about 300 mm/min to obtain the conductive wire with the diameter of about 40 mu m, the tensile strength of about 60 MPa and the conductivity of about 1850 s/m.
Stranding two conductive wires of 3cm into one conductive wire, adhering conductive adhesive tapes on two ends of the conductive wire by using conductive adhesives, connecting the conductive wire to a digital source meter, stretching a sensor along the axial direction under a fixed voltage of 1V, wherein the initial current is 39.3 mu A, the current is reduced to 38.7 mu A when the strain is 1%, and the current is reduced to 35.6 mu A when the strain is increased to 8%; and repeatedly applying 2% strain, and stabilizing the current output at about 37.5 muA.
Example 4
Taking 0.2 part of chitosan, dispersing in 99.8 parts of 0.5% acetic acid aqueous solution, and preparing into a chitosan solution with positive charge and concentration of 0.2wt% through mechanical stirring or ultrasonic treatment; 0.2 portion of sodium carboxymethylcellulose is taken to be dispersed in 99.8 portions of deionized water, and the sodium carboxymethylcellulose solution with the concentration of 0.2wt% is obtained after mechanical or ultrasonic treatment.
0.1 part of graphene is added into the prepared chitosan solution, and the carbon nano tube aqueous dispersion with stable chitosan concentration of about 0.1wt% is prepared through mechanical stirring or ultrasonic treatment. 0.1 part of graphene is added into the prepared sodium carboxymethyl cellulose solution, and the sodium carboxymethyl cellulose stable carbon nano tube aqueous dispersion with the concentration of about 0.1wt% is prepared through mechanical stirring or ultrasonic treatment.
Dropping the chitosan solution on a culture dish, dropping the graphene dispersion liquid stabilized by using sodium carboxymethylcellulose on the culture dish close to the droplets, converging the interface of the two droplets by using forceps, instantly forming a solid-like cation-anion complex by reacting the chitosan with positive charges on the interface with the sodium carboxymethylcellulose with negative charges, wrapping the graphene in the solid-like cation-anion complex, drawing the cation-anion complex wrapped with the graphene out of the interface to form a micron-scale filament, winding the filament on a winding drum driven by a motor, and controlling the spinning speed of the interface to be about 100 mm/min to obtain the conductive wire with the diameter of about 30 mu m, the tensile strength of about 100 MPa and the conductivity of about 450 s/m.
Stranding five conductive wires of 3cm into one conductive wire, adhering conductive adhesive tapes on two ends of the conductive wire by using conductive adhesives, connecting the conductive wire to a digital source meter, stretching a sensor along the axial direction under a fixed voltage of 1V, wherein the initial current is 32.3 mu A, the current is reduced to 31.2 mu A when the strain is 1%, and the current is reduced to 26.1 mu A when the strain is increased to 8%; and repeatedly applying 2% strain, and stabilizing the current output at about 29.8 muA.
Example 5
Taking 0.2 part of cationic corn starch and 10 parts of deionized water, and heating to 80 DEGoC, after fully gelatinizing the starch, cooling to room temperature, adding the gelatinized starch into 39.8 parts of deionized water, and carrying out mechanical or ultrasonic treatment to obtain a cationic corn starch solution with the concentration of 0.4 wt%; dispersing 0.2 part of anionic potato starch in 10 parts of deionized water, and heating to 80%oAnd C, fully gelatinizing the starch, cooling to room temperature, adding the gelatinized starch into 39.8 parts of deionized water, and carrying out mechanical or ultrasonic treatment to obtain an anionic potato starch solution with the concentration of 0.4 wt%.
Adding 20 parts of silver nanowire dispersion liquid with the concentration of 1wt% into the prepared cationic starch solution, adding 30 parts of deionized water, and preparing silver nanowire aqueous dispersion liquid with the stable concentration of 0.2wt% of cationic starch of 0.2wt% by mechanical stirring or ultrasonic treatment; similarly, 20 parts of 1wt% silver nanowire dispersion solution was added to the above prepared anionic starch solution, and 30 parts of deionized water was added, followed by mechanical stirring or ultrasonic treatment to prepare 0.2wt% silver nanowire aqueous dispersion having a stable concentration of about 0.2wt% anionic starch.
Dropping the silver nanowire dispersion stabilized by using the cationic corn starch on a culture dish, dropping the silver nanowire dispersion stabilized by using the anionic potato starch on the culture dish close to the droplets, gathering the interface of the two droplets by using tweezers, instantly forming a solid-like anionic starch compound on the interface by reacting the cationic starch with the anionic horse starch, wrapping the silver nanowires in the solid-like anionic starch compound, drawing the anionic starch compound wrapped with the silver nanowires from the interface to form micrometer filaments, winding the filaments on a winding drum driven by a motor, and controlling the spinning speed of the interface to be about 300 mm/min to obtain the conductive filaments with the diameter of about 40 mu m, the tensile strength of about 70 MPa and the conductivity of about 2500 s/m.
Stranding three conductive wires of 3cm into one conductive wire, adhering conductive adhesive tapes on two ends of the conductive wire by using conductive adhesives, connecting the conductive wire to a digital source meter, stretching a sensor along the axial direction under a fixed voltage of 1V, wherein the initial current is 58.2 mu A, the current is reduced to 54.4 mu A when the strain is 1%, and the current is reduced to 43.1 mu A when the strain is increased to 8%; and repeatedly applying 2% strain, and stabilizing the current output at about 49.5 muA.
Example 6
Taking 0.2 part of cationic guar gum, dispersing in 49.8 parts of deionized water, and preparing into a cationic guar gum solution with the concentration of 0.4wt% through mechanical stirring or ultrasonic treatment; adding 0.2 part of sodium alginate into 49.8 parts of deionized water, and performing mechanical or ultrasonic treatment to obtain a sodium alginate solution with the concentration of 0.4 wt%.
Adding 10 parts of silver nanowire dispersion liquid with the concentration of 1wt% into the prepared cationic guar gum solution, supplementing 40 parts of deionized water, and preparing silver nanowire aqueous dispersion liquid with the stable concentration of 0.1wt% and 0.2wt% of cationic guar gum through mechanical stirring or ultrasonic treatment; and similarly, adding 10 parts of silver nanowire dispersion liquid with the concentration of 1wt% into the prepared sodium alginate solution, adding 40 parts of deionized water, and mechanically stirring or ultrasonically treating to prepare the silver nanowire aqueous dispersion liquid with the concentration of 0.1wt% and the stable sodium alginate of 0.2 wt%.
Dropping the silver nanowire dispersion stabilized by using the cationic guar gum on a culture dish, dropping the silver nanowire dispersion stabilized by using sodium alginate on the culture dish close to the droplets, converging the interface of the two droplets by using tweezers, instantly forming a solid-like cation-anion compound on the interface by reacting the cationic guar gum with the negatively charged sodium alginate, clamping the silver nanowire in the silver nanowire, drawing the cation-anion compound coated with the silver nanowire out of the interface to form a micron-scale filament, winding the filament on a winding drum driven by a motor, and controlling the spinning speed of the interface to be about 200 mm/min to obtain the conductive wire with the diameter of about 30 mu m, the tensile strength of about 100 MPa and the conductivity of about 1250 s/m.
Stranding four conductive wires of 3cm into one conductive wire, adhering conductive adhesive tapes on two ends of the conductive wire by using conductive adhesives, connecting the conductive wire to a digital source meter, stretching a sensor along the axial direction under a fixed voltage of 1V, wherein the initial current is 48.7 mu A, the current is reduced to 45.2 mu A when the strain is 1%, and the current is reduced to 39.7 mu A when the strain is increased to 8%; and repeatedly applying 2% strain, and stabilizing the current output at about 43.3 muA.
Claims (7)
1. A method for preparing a flexible sensing material by using an interface spinning technology is characterized by comprising the following steps:
(1) dispersing a cationic natural high molecular polymer in deionized water to obtain a cationic natural high molecular water solution, and mechanically stirring or ultrasonically treating to obtain a cationic dispersant system; dispersing an anionic natural high molecular polymer in deionized water to obtain an anionic natural high molecular solution, and mechanically stirring or ultrasonically treating the anionic natural high molecular solution to obtain an anionic dispersant system;
(2) adding a conductive nano material into a cationic dispersant system, and preparing a conductive nano material aqueous dispersion a stabilized by using a cationic dispersant through mechanical stirring or ultrasonic treatment; adding the conductive nano material into an anionic dispersant system, and preparing a conductive nano material aqueous dispersion b stabilized by using an anionic dispersant through mechanical stirring or ultrasonic treatment;
(3) respectively placing the conductive nano material dispersion liquid a and b in the same container to form a contact interface or a non-contact interface, gathering the interfaces of the conductive material dispersion liquid a and b, extracting the instantly formed solid-like anion-cation compound, quickly drying the moisture in the spun conductive filament, and winding the filament on a reel to prepare the conductive filament.
2. The method of claim 1, wherein the cationic dispersant system has a cationic natural polymer concentration of 0.1 to 0.6 wt%; in the ionic dispersant system, the concentration of anionic natural polymer is 0.1-0.6 wt%; in the conductive nano-material aqueous dispersion a, the concentration of the conductive nano-material is 0-0.4 wt%; in the conductive nano-material aqueous dispersion b, the concentration of the conductive nano-material is 0.1-0.4 wt%.
3. The method of claim 1, wherein the conductive nanomaterial is selected from the group consisting of carbon nanotubes, graphene, and metal nanoparticles; the cation/anion natural high molecular polymer is cation polysaccharide or anion polysaccharide obtained by chemical modification of natural high molecular polymer, or natural high molecular polysaccharide with ionizable groups.
4. The method according to claim 3, wherein the natural high molecular polymer is cellulose, starch, guar gum; the natural high molecular polysaccharide with ionizable groups is chitosan and sodium alginate.
5. The method as claimed in claim 1, wherein the conductive yarn spinning speed is controlled to be 50-300 mm/min.
6. Use of a flexible sensor material prepared by the method of any one of claims 1 to 5 as a strain sensor material.
7. The use of claim 6, wherein the strain sensor is formed by combining a single conductive wire or a plurality of conductive wires into a strand, adhering conductive tapes at two ends, and introducing a lead.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114197082A (en) * | 2021-12-15 | 2022-03-18 | 中国科学院青岛生物能源与过程研究所 | Composite functional filament with core-shell structure and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109750387A (en) * | 2019-01-09 | 2019-05-14 | 北京科技大学 | A kind of preparation method being orientated conductive hydrogel fibrous material |
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| CN109750387A (en) * | 2019-01-09 | 2019-05-14 | 北京科技大学 | A kind of preparation method being orientated conductive hydrogel fibrous material |
Non-Patent Citations (1)
| Title |
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| YUFAN LIN ET.: "Interfacial polyelectrolyte complexation spinning of graphene/cellulose nanofibrils for fiber-shaped electrodes", 《INTERFACIAL POLYELECTROLYTE COMPLEXATION SPINNING OF GRAPHENE/CELLULOSE NANOFIBRILS FOR FIBER-SHAPED ELECTRODES》 * |
Cited By (1)
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| CN114197082A (en) * | 2021-12-15 | 2022-03-18 | 中国科学院青岛生物能源与过程研究所 | Composite functional filament with core-shell structure and preparation method thereof |
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Application publication date: 20210903 |