CN103808247B - A kind of strain transducer preparation method based on CNT three-dimensional network film - Google Patents
A kind of strain transducer preparation method based on CNT three-dimensional network film Download PDFInfo
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- CN103808247B CN103808247B CN201210436811.7A CN201210436811A CN103808247B CN 103808247 B CN103808247 B CN 103808247B CN 201210436811 A CN201210436811 A CN 201210436811A CN 103808247 B CN103808247 B CN 103808247B
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Abstract
Based on a strain transducer preparation method for CNT three-dimensional network film, mainly solving the existing CNT sensing technology based in polymeric matrix can affect the problem of composite material forming and composite materials property. Performing step: merge the mixture of CNT and surface dispersant (1) method by machinery is prepared single aqueous dispersion of CNT; (2) single aqueous dispersion of CNT is poured into container suction filtration film forming on filter membrane of vacuum suction filter; (3) by carbon nanocapsule thin film and filter membrane compacting, put into baking oven and solidify, after solidifying, obtain three-dimension film after peeling off filter membrane; (4) cut rectangle structure from film, wire is fixed on to film surface, this sensor is imbedded to composite inner ad-hoc location, by composite material solidification technological forming. There is interfacial combined function good, can with the common moulding of composite, be applicable to carrying out the monitoring of inside configuration strain field, the high and linear repeatable feature of strain sensing precision.
Description
Technical field
The present invention relates to a kind of transducer production method, relate in particular to a kind of strain transducer preparation method based on CNT three-dimension film, belong to materials science field.
Background technology
CNT is with its excellent thermodynamic property, piezoresistive and electrical property and become excellent sensor material. directly by carbon nanotube dispersed in polymeric matrix, during by the strain of composite material resistance variation monitoring, the strain of carbon nano tube compound material and resistance can show good linear relationship, but the intermolecular force of CNT is larger, in the time being directly scattered in polymeric matrix, its huge specific area can cause resin matrix viscosity to increase, cause composite material forming difficulty, thereby affect composite materials property, simultaneously because the content of CNT is lower, the problems such as more difficult dispersion also can have influence on structure and the sensing accuracy of CNT sensing network.
Summary of the invention
Based on the problems referred to above, carbon nano-tube film is introduced sensor field by the present invention. carbon nano-tube film (carbon nanometer paper) is that a kind of intermolecular Van der Waals force of CNT (single wall or many walls) that relies on is formed by connecting, by CNT and space forms therebetween film-form self-supporting 3-D solid structure, it has high conductivity, electromagnetic property and mechanical property, than add CNT in resin, carbon nano-tube film is formed by connecting by CNT completely, there is more excellent electrical conductance, pawnshop is put in need to carry out the composite structure of local train monitoring time, highdensity carbon nano tube network can distribute and have good sensitiveness structure partial stress/strain, its anisotropic properties also makes it have different directions stress/strain sensing capabilities.
For achieving the above object, the present invention adopts following technical proposals: a kind of strain transducer preparation method based on CNT three-dimensional network film, realizes by following steps:
(1) method that the mixture of CNT and surface dispersant merges by machinery is prepared single aqueous dispersion of CNT, wherein CNT is selected multi-walled carbon nano-tubes, SWCN, functionalized carbon nano-tube, surfactant is selected TX-100, SDS, SDBS, the concentration of aqueous solution of CNT is controlled at 0.01-2.5wt%, surfactant: CNT mass ratio=20:1-1:1, mechanical fusion method mainly comprises grinding body grinding, magnetic agitation, ultrasonic dispersion, supercentrifugal process.
(2) single aqueous dispersion of CNT is poured into upper container suction filtration film forming on filter membrane of vacuum suction filter, filter membrane is selected CN-CA or the PTFE film of 0.22 or 0.44 μ m, and control vacuum is 40-100kpa.
(3) carbon nanocapsule thin film and filter membrane are together put into compacting between corrosion resistant plate, put into baking oven 50-150 degree and solidify 1-10 hour, obtain CNT three-dimension film after peeling off filter membrane after having solidified.
(4) cut long 10mm from carbon nano-tube film, the rectangle structure of wide 4mm, utilize conducting resinl that 4 copper conductors (0.2mm diameter) are fixed on to carbon nano-tube film surface, this sensor is imbedded to composite inner (or being affixed on composite outside outward) ad-hoc location, by composite material solidification technique curing molding.
(5) in composite static stretch experimentation, utilize four probe method to measure respectively electric current and the voltage change of carbon nano-tube film, calculate carbon nano-tube film sensor resistance variation-strain curve, it is as follows that matching obtains strain sensing coefficient S value:
Wherein, S is strain sensing coefficient; Δ R is resistance variations; R0For initial resistance; ε is strain.
(6) resistivity of this CNT three-dimension film strain transducer can reach 10-3-10-5Ω m, has higher resistance-strain linear fit relation.
Beneficial effect of the present invention and feature:
(1) this CNT three-dimensional net structure and composite structure material have good interfacial combined function, can with the common moulding of composite, not only can not affect structural mechanic of complex material performance, and can improve composite material interface bond strength;
(2) overcome traditional strain transducer (resistance strain gage, Fibre Optical Sensor) size large, imbed the inner problem that can affect structural behaviour of composite structure, be applicable to very much carrying out the monitoring of inside configuration strain field.
(3) strain transducer based on CNT three-dimensional net structure has very excellent strain sensing precision and linear repeatable.
Brief description of the drawings
Fig. 1 is CNT three-dimension film strain transducer external structure schematic diagram.
Fig. 2 is the SEM photograph of carbon nano-tube film sensor internal structure.
Detailed description of the invention
Embodiment 1
With reference to Fig. 1, Fig. 2, a kind of strain transducer preparation method based on CNT three-dimensional network film, realizes by following steps:
The method that the mixture of a, CNT and surface dispersant merges by machinery is prepared single aqueous dispersion of CNT, wherein CNT is selected multi-walled carbon nano-tubes, surfactant is selected TX-100, the concentration of aqueous solution of CNT is controlled at 0.1wt%, surfactant: CNT mass ratio=5:1, mechanical fusion method mainly comprises grinding body grinding, magnetic agitation, ultrasonic dispersion, supercentrifugal process.
B, single aqueous dispersion of CNT is poured into upper container suction filtration film forming on filter membrane of vacuum suction filter, filter membrane is selected 0.22PTFE film, and control vacuum is 60kpa.
C, carbon nanocapsule thin film and filter membrane are together put into compacting between corrosion resistant plate, put into baking oven 100 degree and solidify 4 hours, obtain CNT three-dimension film after peeling off filter membrane after having solidified.
D, cut long 10mm from carbon nano-tube film, the rectangle structure of wide 4mm, utilize conducting resinl that 4 copper conductors (0.2mm diameter) are fixed on to carbon nano-tube film surface, this sensor is imbedded to composite inner (or being affixed on composite outside outward) ad-hoc location, by composite material solidification technique curing molding.
In composite static stretch experimentation, utilize four probe method to measure respectively electric current and the voltage change of carbon nano-tube film, calculate carbon nano-tube film sensor resistance variation-strain curve, it is as follows that matching obtains strain sensing coefficient S value:
Wherein, S is strain sensing coefficient; Δ R is resistance variations; R0For initial resistance; ε is strain.
The resistivity of this CNT three-dimension film strain transducer can reach 10-3-10-5Ω m, has higher resistance-strain line sexual intercourse.
Embodiment 2
With reference to Fig. 1, Fig. 2, a kind of strain transducer preparation method based on CNT three-dimensional network film, realizes by following steps:
The method that the mixture of a, CNT and surface dispersant merges by machinery is prepared single aqueous dispersion of CNT, wherein CNT is selected multi-walled carbon nano-tubes, SWCN, functionalized carbon nano-tube, surfactant is selected TX-100, SDS, SDBS, the concentration of aqueous solution of CNT is controlled at 0.01wt%, surfactant: CNT (mass ratio)=20:1, mechanical fusion method mainly comprises mortar grinding, magnetic agitation, ultrasonic dispersion, high speed centrifugation.
B, single aqueous dispersion of CNT is poured into upper container suction filtration film forming on filter membrane of vacuum suction filter, it is CN-CA or the PTFE film of 0.22 or 0.47 μ m that filter membrane is selected aperture, and control vacuum is 40kpa.
C, carbon nanocapsule thin film and filter membrane are together put into compacting between corrosion resistant plate, put into baking oven 50 degree and solidify 10 hours, after having solidified, peel off filter membrane and obtain CNT three-dimension film.
D, cut long 10mm from carbon nano-tube film, the rectangle structure of wide 4mm, utilize conducting resinl by 4 copper conductor 1(0.2mm diameters) be fixed on the surface of carbon nano-tube film 2, this sensor is imbedded to composite inner (or being affixed on composite outside outward) ad-hoc location, by composite material solidification technique curing molding.
Other are with embodiment 1
Embodiment 3
With reference to Fig. 1, Fig. 2, a kind of strain transducer preparation method based on CNT three-dimensional network film, realizes by following steps:
The method that the mixture of a, CNT and surface dispersant merges by machinery is prepared single aqueous dispersion of CNT, wherein CNT is selected multi-walled carbon nano-tubes, SWCN, functionalized carbon nano-tube, surfactant is selected TX-100, SDS, SDBS, the concentration of aqueous solution of CNT is controlled at 2.5wt%, surfactant: CNT (mass ratio)=5:1, mechanical fusion method mainly comprises mortar grinding, magnetic agitation, ultrasonic dispersion, high speed centrifugation.
B, single aqueous dispersion of CNT is poured into upper container suction filtration film forming on filter membrane of vacuum suction filter, it is CN-CA or the PTFE film of 0.22 or 0.47 μ m that filter membrane is selected aperture, and control vacuum is 100kpa.
C, carbon nanocapsule thin film and filter membrane are together put into compacting between corrosion resistant plate, put into baking oven 150 degree and solidify 1 hour, after having solidified, peel off filter membrane and obtain CNT three-dimension film.
D, cut long 10mm from carbon nano-tube film, the rectangle structure of wide 4mm, utilize conducting resinl by 4 copper conductor 1(0.2mm diameters) be fixed on carbon nano-tube film 2 surfaces, this sensor is imbedded to composite inner (or being affixed on composite outside outward) ad-hoc location, by composite material solidification technique curing molding.
Other are with embodiment 1.
Claims (6)
1. the strain transducer preparation method based on CNT three-dimensional network film, be by withLower step realizes:
(1) method that the mixture of CNT and surface dispersant merges by machinery is prepared carbon and is receivedSingle aqueous dispersion of mitron, wherein CNT select multi-walled carbon nano-tubes, SWCN,Functionalized carbon nano-tube, surfactant is selected TX-100, SDS, SDBS, and the list of CNT dividesAproll solution concentration is controlled at 0.01-2.5wt%, surfactant: CNT mass ratio=20:1To 1:1, mechanical fusion method comprises grinding body grinding, magnetic agitation, ultrasonic dispersion, supercentrifugal process;
(2) upper container of single aqueous dispersion of CNT being poured into vacuum suction filter is filteringSuction filtration film forming on film, it is CN-CA or the PTFE film of 0.22 or 0.44 μ m that filter membrane is selected aperture,Control vacuum is 40-100kpa;
(3) carbon nanocapsule thin film and filter membrane are together put into compacting between corrosion resistant plate, put into baking oven50-150 degree Celsius of curing 1-10 hour, obtains CNT three after peeling off filter membrane after having solidifiedDimension network thin-film;
(4) cut rectangle structure from CNT three-dimensional network film, utilize conducting resinl by copperWire is fixed on CNT three-dimensional network film surface, and this sensor is imbedded to composite innerOr the outer outside ad-hoc location of composite that is affixed on, by composite material solidification technique curing molding;
(5), in composite static stretch experimentation, utilize four probe method to measure respectively carbon nanometerElectric current and the voltage change of pipe three-dimensional network film, calculate CNT three-dimensional network thin film sensorResistance variations-strain curve, it is as follows that matching obtains strain sensing coefficient S value:
Wherein, S is strain sensing coefficient; Δ R is resistance variations; R0For initial resistance; ε is strain;
(6) resistivity of this CNT three-dimensional network thin film strain sensors can reach 10-3-10-5Ω·m。
2. a kind of strain sensing based on CNT three-dimensional network film as claimed in claim 1Device preparation method, realizes by following concrete steps:
The method that the mixture of a, CNT and surface dispersant merges by machinery is prepared carbon nanometerSingle aqueous dispersion of pipe, wherein CNT is selected multi-walled carbon nano-tubes, and surfactant is selectedTX-100, single aqueous dispersion concentration of CNT is controlled at 0.1wt%, surfactant: carbon is receivedMitron mass ratio=5:1, mechanical fusion method comprises grinding body grinding, magnetic agitation, ultrasonic dispersion, heightSpeed centrifugal process;
B, pour single aqueous dispersion of CNT into vacuum suction filter upper container at filter membraneUpper suction filtration film forming, filter membrane is selected 0.22PTFE film, and control vacuum is 60kpa;
C, carbon nanocapsule thin film and filter membrane are together put into compacting between corrosion resistant plate, put into baking oven 100Degree Celsius solidify 4 hours, after having solidified, peel off that to obtain CNT three-dimensional network after filter membrane thinFilm;
D, cut rectangle structure from CNT three-dimensional network film, utilize conducting resinl that copper is ledLine is fixed on CNT three-dimensional network film surface, by this sensor imbed composite inner orBe affixed on the outside ad-hoc location of composite outward, by composite material solidification technique curing molding.
3. a kind of strain sensing based on CNT three-dimensional network film as claimed in claim 1Device preparation method, realizes by following concrete steps:
The method that the mixture of a, CNT and surface dispersant merges by machinery is prepared carbon nanometerSingle aqueous dispersion of pipe, wherein CNT select multi-walled carbon nano-tubes, SWCN,Functionalized carbon nano-tube, surfactant is selected TX-100, SDS, SDBS, and the list of CNT dividesAproll solution concentration is controlled at 0.01wt%, surfactant: CNT mass ratio=20:1, machineTool fusion method comprises mortar grinding, magnetic agitation, ultrasonic dispersion, high speed centrifugation;
B, pour single aqueous dispersion of CNT into vacuum suction filter upper container at filter membraneUpper suction filtration film forming, it is CN-CA or the PTFE film of 0.22 or 0.47 μ m that filter membrane is selected aperture,Control vacuum is 40kpa;
C, carbon nanocapsule thin film and filter membrane are together put into compacting between corrosion resistant plate, put into baking oven 50Degree Celsius solidify 10 hours, after having solidified, peel off filter membrane and obtain CNT three-dimensional network film;
D, cut rectangle structure from CNT three-dimensional network film, utilize conducting resinl that copper is ledLine is fixed on the surface of CNT three-dimensional network film, by this sensor imbed composite inner orBe affixed on the outside ad-hoc location of composite outward, by composite material solidification technique curing molding.
4. a kind of strain sensing based on CNT three-dimensional network film as claimed in claim 1Device preparation method, realizes by following concrete steps:
The method that the mixture of a, CNT and surface dispersant merges by machinery is prepared carbon nanometerSingle aqueous dispersion of pipe, wherein CNT select multi-walled carbon nano-tubes, SWCN,Functionalized carbon nano-tube, surfactant is selected TX-100, SDS, SDBS, and the list of CNT dividesAproll solution concentration is controlled at 2.5wt%, surfactant: CNT mass ratio=5:1, machineryFusion method comprises mortar grinding, magnetic agitation, ultrasonic dispersion, high speed centrifugation;
B, pour single aqueous dispersion of CNT into vacuum suction filter upper container at filter membraneUpper suction filtration film forming, it is CN-CA or the PTFE film of 0.22 or 0.47 μ m that filter membrane is selected aperture,Control vacuum is 100kpa;
C, carbon nanocapsule thin film and filter membrane are together put into compacting between corrosion resistant plate, put into baking oven 150Degree Celsius solidify 1 hour, after having solidified, peel off filter membrane and obtain CNT three-dimensional network film;
D, cut rectangle structure from CNT three-dimensional network film, utilize conducting resinl that copper is ledLine is fixed on CNT three-dimensional network film surface, and this sensor is imbedded to composite inner or outerBe affixed on the outside ad-hoc location of composite, by composite material solidification technique curing molding.
5. one is as claimed in claim 1 or 2 or 3 or 4 thin based on CNT three-dimensional networkThe strain transducer preparation method of film, is characterized in that: described rectangle structure is long 10mm, wide4mm。
6. one is as claimed in claim 1 or 2 or 3 or 4 thin based on CNT three-dimensional networkThe strain transducer preparation method of film, is characterized in that: described copper conductor adopts 4, and every straightFootpath is 0.2mm.
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| CN105675182A (en) * | 2015-11-30 | 2016-06-15 | 重庆大学 | Preparation method of cellulose-based flexible stress-strain sensitive material |
| CN105547138B (en) * | 2015-12-07 | 2018-06-05 | 大连理工大学 | The preparation method of flexible strain transducer made of macro mesh structure carbon nanocoil |
| JP6597318B2 (en) * | 2016-01-06 | 2019-10-30 | ヤマハ株式会社 | Strain sensor element |
| CN105928452B (en) * | 2016-04-19 | 2020-02-18 | 武汉理工大学 | High-tensile strain piezoelectric sensor and preparation method thereof |
| CN106643464B (en) * | 2016-12-27 | 2019-02-22 | 北京航空航天大学 | A kind of composite material based on carbon nano-tube film is respectively to strain monitoring method |
| CN109096553A (en) * | 2018-08-16 | 2018-12-28 | 安徽省汉甲机电设备科技有限公司 | A kind of heatproof, resistance to permanent deformation high-performance rubber material preparation method |
| CN110243276A (en) * | 2019-06-28 | 2019-09-17 | 江苏大学 | A kind of stretchable stress strain gauge and preparation method applied to articulations digitorum manus |
| CN113514174B (en) * | 2021-03-10 | 2023-08-01 | 深圳烯湾科技有限公司 | Stress detection assembly for pressure gas storage container and pressure gas storage container |
| CN113375544B (en) * | 2021-06-21 | 2022-11-29 | 沈阳航空航天大学 | Micro-nano sensor for monitoring health state of connection structure of lug of airplane and manufacturing method thereof |
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