CN106904598A - A kind of CNT magnet and its preparation method and application - Google Patents
A kind of CNT magnet and its preparation method and application Download PDFInfo
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- CN106904598A CN106904598A CN201710260612.8A CN201710260612A CN106904598A CN 106904598 A CN106904598 A CN 106904598A CN 201710260612 A CN201710260612 A CN 201710260612A CN 106904598 A CN106904598 A CN 106904598A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2202/00—Structure or properties of carbon nanotubes
- C01B2202/02—Single-walled nanotubes
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Abstract
The present invention relates to a kind of CNT magnet and its preparation method and application, the CNT magnet is the SWCN processed by opening after directional trend.Opening treatment is carried out after by SWCN directional trend to obtain.The present invention produces magnetic field using open end edge atomic magnetic moment, and the magnetic moment of the CNT magnet open end edge carbon atom of preparation is 40 45 μ B, can around produce the up to steady magnetic field of 45T.The generation in magnetic field does not need the conditions such as high current, low temperature, and Joule heat is not produced while magnetic field is produced, and greatly reducing the consumption of the energy.The CNT magnet have produce magnetic field it is strong, lightweight, the features such as energy consumption is low and works at room temperature, great researching value and gathering around has broad application prospects.
Description
Technical field
Preparation and ultrastrong magnetic field generation technology the present invention relates to magnet, and in particular to a kind of CNT magnet and its
Preparation method and application.
Background technology
Magnetic field is one of most basic physical quantity of decision state of matter, and magnetic field can change the electronics knot of material interior atoms
Structure simultaneously causes energy level splitting.With research object and the difference of research contents, the requirement to magnetic field intensity also has difference.For institute
The physical quantity of research and magnetic field are presented linear relationship or the just saturation under very low magnetic field, and are studied after saturation
Amount do not changed with magnetic field, it is sufficient that general magnetic field intensity.And ultrastrong magnetic field is condensing as a kind of extreme condition
There is particularly important meaning, such as integer quantum Hall effect, dosis refracta in state physics, material science and life science
The discovery of sub- Hall effect is required for ultrastrong magnetic field.
In general, magnetic field can be produced using electric current or permanent magnet.The magnetic field that permanent magnet is produced has operating temperature high
(just can be with less than Curie temperature), the advantage of the low advantage of energy consumption (energy is needed during magnetization).But existing permanent magnet highest
Magnetic induction intensity is about 2.5T or so, far below ultrastrong magnetic field (magnetic induction intensity is more than or equal to 5T).
The production method of current ultrastrong magnetic field mainly has：Superconducting magnet, water-cooled magnet or hybrid magnet.Superconducting magnet is deposited
In upper field limit, disappeared more than superconducting characteristic behind highest magnetic field.Superconducting magnet energy consumption is low, but needs low temperature (liquid helium), and condition is severe
Carve.Water-cooled magnet is that the main difficulty that magnetic field, this method is excited using the high current in wire coil has three below side
Face, first, in coil by high current huge power can be consumed due to coil resistance in itself；Second, in coil
Electric current can constantly produce substantial amounts of Joule heat, continuous elevated temperature cause magnet cannot normal work, in actual use
Water-cooled must be carried out；3rd, there is electromagnetic interaction between electric current and magnetic field, coil will bear while magnetic field is produced
Huge stress, after such as magnetic field reaches 50T, 100T, corresponding stress respectively reaches 1,40,000 atmospheric pressure, has exceeded most of gold
The intensity of category.Due to the presence of above mentioned problem, generally require very harsh condition when obtaining stable state ultrastrong magnetic field and magnet sets
The comprehensive high-tech of meter, manufacture, Forced water cooling and high-power DC power supply.The most strong stable state magnetic that can be realized in the world at present
Magnet in American National high-intensity magnetic field laboratory, this mixed type magnet is by the superconducting magnet of 11.5T and the water of 33.5T
Cold magnet composition, the maximum magnetic induction that it can reach is 45T.But the generation of high-intensity magnetic field needs very harsh condition,
For example, its operating temperature is 1.8K, dropping to operating temperature from room temperature needs 6 weeks, it is necessary to 2800 liters of liquid heliums, circulating water flow
15142 Liter Per Minutes, electric consumption 33MW.
The content of the invention
For the deficiencies in the prior art, the present invention provides a kind of CNT magnet and preparation method thereof and answers
With obtaining producing the CNT magnet of 45T steady magnetic fields.Compared with prior art, the present invention have magnetic field it is strong,
Energy consumption is low, operating temperature is high and the advantage such as lightweight, gathers around and has broad application prospects.
It is that, up to this purpose, the present invention uses following technical scheme：
In a first aspect, the present invention provides a kind of CNT magnet, the magnet is to be processed by opening after directional trend
SWCN.
After SWCN diametrically disconnects, the carbon atom (having the edge carbons of dangling bond) of openend has
Very big magnetic moment.Result shows, the magnetic moment of SWCN each edge carbons reaches 40-45 μB(Bohr magneton).
This may have two reasons：One is that the effective mass of electronics in carbon pipe is far smaller than electric proton rest mass, therefore it has very
Big magnetic moment.Two is that compared with multi-walled carbon nano-tubes, diameter of single-wall carbon nano tube is smaller, and curvature (inverse of diameter) is bigger, leads
Causing the carbon atom of SWCN openend has bigger magnetic moment such that it is able to produce ultrastrong magnetic field.
According to the present invention, the SWCN can be one or at least two.
According to the present invention, the single a diameter of 1.5-2.5nm of the SWCN, for example can be 1.5nm,
Between 1.6nm, 1.7nm, 1.8nm, 1.9nm, 2.0nm, 2.1nm, 2.2nm, 2.3nm, 2.4nm or 2.5nm, and above-mentioned numerical value
Specific point value, as space is limited and for concise consideration, the present invention specific point value that no longer scope described in exclusive list includes.
Second aspect, the present invention provides a kind of preparation method of CNT magnet as described in relation to the first aspect, the side
Method is comprised the following steps：
(1) by SWCN directional trend；
(2) SWCN of the directional trend obtained to step (1) carries out opening treatment, obtains the carbon nano tube magnetic
Body.
Directional trend of the present invention refers to：When processing at least two SWCNs, make every carbon nanometer
The orientation of pipe is highly consistent, close to CNT between intersect angle be less than 10 °；When to single SWCN
When being processed, make CNT without bending.
The purpose of directional trend is single-root carbon nano-tube is taken without the carbon pipe for bending or make direction in many CNTs different
To consistent, obtain that every carbon pipe direction is identical, the big carbon pipe aggregation of close-packed arrays, density is more in order to the treatment that is open simultaneously
Root carbon pipe, and the every magnetic field of carbon pipe can synthesize, and magnetic field is produced in larger space.
Opening of the present invention is processed：Carbon pipe is diametrically disconnected.
According to the present invention, after obtaining step (2) the CNT magnet, it is packaged.
The purpose of encapsulation is in order that CNT magnet isolation air, protects CNT to be obtained after opening is processed
The dangling bonds of edge atom by adsorption saturations such as the oxygen in air, and then magnet steady operation will not be made.
The present invention does not do particular determination to the packaged type of CNT magnet, if can reach by CNT magnet every
The purpose of exhausted air.
Exemplary, the CNT magnet that step (2) is obtained is encapsulated in liquid, non-oxidizing atmosphere or vacuum,
But it is non-to be only limitted to this.The liquid is deionized water and/or absolute ethyl alcohol.
The present invention prepares SWCN from means well known in the art, is not carried out for specific preparation method
Particular determination, as long as the method that can obtain SWCN is suitable for the present invention.
Exemplary, the present invention can select chemical vapour deposition technique, arc discharge method or Laser vaporization preparation process
(1) SWCN described in, but non-it is only limitted to this.
According to the present invention, when from chemical vapour deposition technique, step (1) described SWCN is chemical vapor deposition
Single pipe powder, film or array prepared by area method.
The present invention from means well known in the art to being oriented of SWCN, for specific method not
Particular determination is carried out, as long as orientation of the single SWCN without bending or many CNTs can be made highly consistent,
Close to CNT between intersect angle be less than 10 °.
Exemplary, compressing tablet process can be carried out to SWCN by tablet press machine in step (1) and realize directional trend,
But it is non-to be only limitted to this.
Exemplary, when step (1) described SWCN is the CNT using chemical vapour deposition technique preparation
During film, processed to being oriented of carbon nano-tube film by wire drawing die, but non-be only limitted to this.
According to the present invention, the radial direction of the single-wall carbon tube in step (2) along the directional trend carries out opening treatment.
The present invention does not carry out particular determination to the mode of the single tube opening treatment after directional trend, it is possible to use
Cutting carbon tube opening technology well known in the art carries out opening treatment to it, it is also possible to new make carbon tube opening technology using following
It is processed, as long as the effect of the single tube opening after making directional trend can be reached.For detailed description carbon
The purpose of the preparation method of nanotube magnet, the present invention enumerates in the following manner to be carried out at opening to the SWCN of directional trend
Reason, but non-it is only limitted to this.
Exemplary, the mode of step (2) the opening treatment is mechanical force or laser ablation, but non-is only limitted to
This.
Exemplary, the implementation method of the mechanical force includes cutting, ball mill treatment or polishing machine treatment etc., institute
Stating the mode of cutting includes that scissor cut, blade cut etc., but non-is only limitted to this.
The mode of above-mentioned ball mill treatment is：Carbon pipe and Ceramic Balls are mixed, hitting between Ceramic Balls during using ball milling
Hit, the carbon pipe between Ceramic Balls is severed, realize that carbon tube opening is processed.
The mode of above-mentioned polishing machine treatment is：Using the rubbing action between polishing disk and CNT, a removal part
CNT, remaining CNT obtains openend.
The mode of above-mentioned laser ablation is：SWCN temperature is set to increase using high power laser light irradiation, in air
With oxygen reaction, ablation carbon pipe under atmosphere, the part that carbon pipe does not have ablation obtains openend.
As preferred technical scheme, the SWCN of directional trend is open using slicer in step (2)
Treatment, including following operation：The SWCN of the directional trend that step (1) is obtained is fixed in embedding medium, uses section
Machine is radially cut, and obtains CNT magnet.
According to the present invention, the embedding medium is non-magnetic embedding medium.
Heretofore described embedding medium is preferably any one in paraffin, gelatin, epoxy resin or OCT frozen embedding agent
Or at least two combination, for example can be any one in paraffin, gelatin, epoxy resin or OCT frozen embedding agent, typical case
But it is infinite to be combined as：Paraffin and gelatin；Epoxy resin and OCT frozen embedding agent；Paraffin and epoxy resin；Paraffin and OCT
Frozen embedding agent；Gelatin and epoxy resin；Gelatin and OCT frozen embedding agent；Paraffin, gelatin and epoxy resin；Paraffin, gelatin,
Epoxy resin and OCT frozen embedding agent etc., as space is limited and for concise consideration, no longer limit of the invention is enumerated.
According to the present invention, the slicer is normal temperature slicer or freezing-microtome.
The third aspect, the present invention provides the application of CNT magnet as described in relation to the first aspect, using carbon nanometer
Pipe magnet produces magnetic field.
The present invention carries out opening treatment by the SWCN to directional trend, obtains CNT magnet.During room temperature,
The magnetic moment of the CNT magnet open end edge carbon atom is about 40-45 μB(magnetic field of the bigger generation of magnetic moment is stronger), it is remote high
In 2.16 μ of iron atomB.CNT magnet prepared by the present invention can produce the up to steady magnetic field of 45T.
Although the magnetic field intensity that single-root carbon nano-tube openend produces is very big, its magnetic field intensity is with the cube of distance
Decay.In order to increase the space in magnetic field, can typically select to prepare a branch of CNT and (cut off each along bundle diameters direction
Carbon pipe) or multiple CNT magnet set, the scope with magnetic field is increased with this.When using multiple CNT magnets
When, to be effectively synthesized the magnetic field of each magnet, generally make each CNT magnet magnetic field with outfield in the same direction using externally-applied magnetic field,
And then obtain the steady magnetic field that magnetic field intensity is big, sphere of action is wide.
Compared with prior art, the present invention at least has following innovation effect：
(1) magnetic moment is big：In room temperature, the magnetic moment of CNT magnet open end edge carbon atom prepared by the present invention is
40-45μB, CNT magnet can produce the up to steady magnetic field of 45T.
(2) energy consumption is low：The present invention produces magnetic field using the carbon pipe magnetic moment of itself, it is not necessary to the harshness such as high current, low temperature
Condition, does not have Joule heat, needs energy when simply magnetizing, and then greatly saved the energy.
(3) it is lightweight：CNT magnet proportion prepared by the present invention is in 1.5-2.2g/cm3Between, it is far smaller than traditional
Metal and Nd Fe B alloys.
Brief description of the drawings
Fig. 1 (a) is carbon nano-tube film schematic diagram prepared by chemical vapour deposition technique, wherein every black line represents list
Root SWCN；
Fig. 1 (b) is the SWCN schematic diagram that directional trend is treated；
Fig. 1 (c) is the SWCN of directional trend by the treatment schematic diagram that is once open；
Fig. 1 (d) is packaged CNT magnet and its openend schematic diagram；
Fig. 2 is the stereoscan photograph of carbon nano-tube film prepared by the embodiment of the present invention 1；
Fig. 3 is the stereoscan photograph of CNT magnet (pencil) prepared by the embodiment of the present invention 1；
Fig. 4 is the stereoscan photograph of CNT magnet (sheet) prepared by the embodiment of the present invention 2；
Fig. 5 be under 2T externally-applied magnetic fields, CNT magnet open end edge atom prepared by the embodiment of the present invention 2 it is flat
Equal Bohr magneton number varies with temperature graph of a relation.
The present invention is described in more detail below.But following examples is only simple example of the invention, not generation
Table or limitation the scope of the present invention, protection scope of the present invention are defined by claims.
Specific embodiment
For the present invention is better described, technical scheme is readily appreciated, below to the present invention further specifically
It is bright.But following embodiments is only simple example of the invention, the scope of the present invention is not represented or limits, this
Invention protection domain is defined by claims.
Specific embodiment of the invention part provides a kind of preparation method of CNT magnet, and methods described includes following
Step：
(1) by SWCN directional trend；
(2) SWCN of the directional trend obtained to step (1) carries out opening treatment, obtains the carbon nano tube magnetic
Body.
Typical but non-limiting embodiment of the invention is as follows：
Embodiment 1
The present embodiment describes CNT magnet in detail by taking carbon nano-tube film prepared by chemical vapour deposition technique as an example
Preparation method, the described method comprises the following steps：
(1) single wall carbon nano-tube film is prepared using chemical gaseous phase depositing process：
A) to enough catalyst (mixture of ferrocene and sulphur powder) are put into the first warm area of CVD tube furnaces, connect
Aerobic road；
B) to argon gas is passed through in the quartz ampoule of CVD tube furnaces, gas flow is 1000sccm, and sets main warm area temperature and be
1100 DEG C, the heating-up time is 1h, soaking time 2h；
C) it is 70 DEG C by the first warm area temperature setting, and added in argon gas after main warm area temperature reaches target temperature
Carbon-source gas methane, methane gas flow is 5-8sccm；
D) after insulation terminates, stopping is passed through methane gas, and turns argon flow amount down, while stop heating the first warm area,
Quartz ampoule naturally cools to room temperature；
E) carbon nano-tube film of quartz ampoule interior surface deposition is taken out using hook long.
As shown in the schematic diagram of Fig. 1 (a) and the scanned photograph of Fig. 2, the carbon nano-tube film that the present embodiment is obtained is by many
The unordered SWCN composition of arrangement.
In above-mentioned preparation method, the time of carbon nano-tube film growth is constituted to the present invention in 1-4h, not
Limitation.
In addition to the above method, the present invention can also prepare SWCN using other method, exemplary, can be with
It is prepared using arc discharge method or Laser vaporization, but non-is only limitted to this.Used as prior art, the above method is this area
Known technological means, as space is limited and for concise consideration, will not enumerate.
(2) treatment is oriented to above-mentioned carbon nano-tube film using wire drawing die：
A) carbon nano-tube film that step (1) is obtained is deployed in deionized water surface, using scissors and tweezers without magnetic
Remove the film of size 3cm × 2cm；
B) carbon nano-tube film is picked up from centre using a diameter of 100 μm of U-shaped copper cash, carbon nano-tube film synthesis one
Beam hangs over U-shaped copper cash bottom；
C) it is together the hole of the diamond wire-drawing die of 1.2mm through internal diameter by the related carbon nano-tube bundle of copper cash, is contracted with this
Gap between tight carbon pipe, excludes unnecessary water, and play orientation；
D) internal diameter of wire-drawing die is gradually reduced to 0.2mm, obtains the carbon nanotube bundles of directional trend.
As shown in Fig. 1 (b), SWCN realizes directional trend, has obtained carbon nanotube bundles.
In above-mentioned processing method, diameter and the length of copper cash are not construed as limiting the invention, and are in order to operate
Preferably.
In above-mentioned processing method, the selection of diamond wire-drawing die is not construed as limiting the invention, should basis
The state of sample is adjusted, as long as sample can be made to realize good directional trend.
(3) the metal scissors using titanium or containing diamond coating carries out shear treatment to orientation carbon tube bank：
A) carbon nanotube bundles of the directional trend for obtaining step (2) are immersed in alcohol (or deionized water), and formation is cut
Environmental protection when cutting.
B) carbon tube bank is diametrically cut using without magnetic scissors (such as titanium, the metal scissors with diamond coating),
CNT magnet is formed, in shearing area, the carbon pipe containing edge atom produces steady magnetic field.
As shown in Fig. 1 (c), the carbon nanotube bundles of directional trend are sheared, and on shearing area, every carbon pipe is cut
It is disconnected, obtain the SWCN with openend.
In above-mentioned processing method, the length of SWCN is not construed as limiting the invention after cutting.Cutting
The length of SWCN is smaller afterwards, and the SWCN being open is more, is conducive to producing strong magnetic on a large scale
.
Optionally, it is packaged after the CNT magnet that step (3) is obtained is dried in a vacuum.
As shown in Fig. 1 (d), air can be completely cut off after CNT magnet is encapsulated, extend its service life.
The pattern of CNT magnet manufactured in the present embodiment is as shown in Figure 3.In figure, pipe is formed after single-wall carbon tube directional trend
Beam, the microns of bundle diameters 50, the section that place shown in arrow is cut for carbon nanotube bundles, steady magnetic field is in section part
Produce.
Embodiment 2
The present embodiment describes CNT magnet in detail by taking SWCN prepared by chemical vapour deposition technique as an example
Preparation method, the described method comprises the following steps：
(1) single wall carbon nano-tube film is prepared using chemical gaseous phase depositing process, preparation method is with the step of embodiment 1 (1)；
(2) treatment is oriented to above-mentioned CNT using tablet press machine：
A) by the single wall carbon nano-tube film obtained in step (1) is using electronic balance weighing quality and records；
B) load weighted single wall carbon nano-tube film is uniformly layered in the mould for tabletting press of a diameter of 5mm, uses compressing tablet
Machine increases to 300MPa to the pressure of sample, stands 1min, obtains the single section of jurisdiction of directional trend；The single
Section of jurisdiction is in disc-shaped, and a diameter of 5mm, thickness depends on carbon pipe quality.
In above-mentioned processing method, the diameter of mould for tabletting press is not construed as limiting the invention, should basis
Carbon nanotube mass size is adjusted, and is advisable with can uniformly be layered in mould sample.
In above-mentioned processing method, the pressure that carbon nanotube-sample applies is not constituted to of the invention with time of repose
Limitation, it is therefore an objective to make the gap between reduction CNT be easy to slice open to process.
(3) opening treatment is carried out to the SWCN of directional trend using slicer：
A) enough OCT embedding mediums are added on the sample stage of freezing-microtome, a diameter of 5mm that step (2) is obtained
Directional trend single section of jurisdiction perpendicular to sample stage direction immerse embedding medium；
B) freezing-microtome is cooled to -25 DEG C in advance, and the non-oxidizing gas (nitrogen of protectiveness is passed through in biopsy cavity room
Gas)；
C) after single section of jurisdiction is fixed, enough OCT embedding mediums are added all to coat SWCN
Come, 60min is placed in freezing-microtome；
E) place after terminating, the sample stage of coated single-walled carbon nano tube piece is adjusted to SWCN and without magnetic blade
Vertical direction, is cut；
F) after the completion of cutting, the rapid sample that takes out is placed in deionized water solution, repeatedly changes water dissolves removal OCT embeddings
Agent, obtains the directional trend SWCN processed by opening, i.e., described CNT magnet.
In above-mentioned processing method, the length of cutting single-wall carbon nanotubes is not construed as limiting the invention, in order to
Operation is advisable.
In above-mentioned processing method, the OCT embedding mediums can be replaced with other frozen embedding agent, as long as list can be fixed
Wall carbon nano tube is easy to opening.
In above-mentioned processing method, the temperature and time length of SWCN sample precooling is not constituted to the present invention
Limitation, should be adjusted according to the state of sample, with can the neat sample sections that cut be advisable.
In above-mentioned processing method, the length of SWCN is not construed as limiting the invention after cutting.Cutting
The length of SWCN is smaller afterwards, and the carbon Guan Yue of opening is more, is conducive to producing large-scale high-intensity magnetic field
The pattern of CNT magnet manufactured in the present embodiment is as shown in figure 4, in figure, SWCN is along perpendicular to disconnected
The direction in face aligns, and the SWCN sample surfaces after slice open are smooth, at the edge (shown in arrow) of section
SWCN forms smooth opening, and steady magnetic field is produced in section part.
Apply the externally-applied magnetic field of 2T to CNT magnet manufactured in the present embodiment, obtain the flat of its open end edge atom
Equal Bohr magneton number varies with temperature graph of a relation.As shown in figure 5, when temperature is 200-220K, the magnetization of CNT magnet
Intensity highest, with the rising of temperature, the intensity of magnetization of magnet is gradually reduced.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned implementation method
Detail, in range of the technology design of the invention, various simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy is no longer separately illustrated.
Additionally, can also be combined between a variety of implementation methods of the invention, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (10)
1. a kind of CNT magnet, it is characterised in that the magnet is the single processed by opening after directional trend
Pipe.
2. CNT magnet as claimed in claim 1, it is characterised in that single a diameter of of the SWCN
1.5-2.5nm。
3. the preparation method of CNT magnet as claimed in claim 1 or 2, it is characterised in that methods described includes following
Step：
(1) by SWCN directional trend；
(2) SWCN of the directional trend obtained to step (1) carries out opening treatment, obtains the CNT magnet.
4. method as claimed in claim 3, it is characterised in that be packaged to the CNT magnet that step (2) is obtained；
Preferably, the CNT magnet that step (2) is obtained is encapsulated in liquid, non-oxidizing atmosphere or vacuum；
Preferably, the liquid is deionized water and/or absolute ethyl alcohol.
5. the method as described in claim 3 or 4, it is characterised in that the preparation method of step (1) described SWCN is
Any one in chemical vapour deposition technique, arc discharge method or Laser vaporization；
Preferably, step (1) described SWCN is single pipe powder, film prepared by chemical vapour deposition technique
Or array.
6. the method as described in claim any one of 3-5, it is characterised in that step is received by tablet press machine in (1) to single wall carbon
Mitron carries out compressing tablet process and realizes directional trend；
Preferably, when step (1) described SWCN is thin using the SWCN of chemical vapour deposition technique preparation
During film, processed to being oriented of single wall carbon nano-tube film by wire drawing die.
7. the method as described in claim any one of 3-6, it is characterised in that the mode of step (2) the opening treatment is machine
Tool power is acted on or laser ablation；
Preferably, the implementation method of the mechanical force includes cutting, ball mill treatment or polishing machine treatment；
Preferably, opening treatment is carried out along the radial direction of the single-wall carbon tube of the directional trend in step (2).
8. the method as described in claim any one of 3-7, it is characterised in that using slicer to directional trend in step (2)
SWCN carries out opening treatment, including following operation：The SWCN of the directional trend that step (1) is obtained is fixed
In embedding medium, radially cut using slicer, obtained CNT magnet.
9. method as claimed in claim 8, it is characterised in that the embedding medium is non-magnetic embedding medium, preferably paraffin,
In gelatin, epoxy resin or OCT frozen embedding agent any one or at least two combination；
Preferably, the slicer is normal temperature slicer or freezing-microtome.
10. the application of CNT magnet as claimed in claim 1 or 2, it is characterised in that utilize the CNT magnet
Produce magnetic field；
Preferably, in the presence of externally-applied magnetic field, magnetize the CNT magnet and produce steady magnetic field.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107311148A (en) * | 2017-08-03 | 2017-11-03 | 复旦大学 | Carbon nano pipe array section of length diameter controllable precise and its preparation method and application |
| CN110282974A (en) * | 2019-06-28 | 2019-09-27 | 华南理工大学 | Oriented alignment magnetic carbon fiber graphene composite film and its preparation method and application |
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| CN107311148A (en) * | 2017-08-03 | 2017-11-03 | 复旦大学 | Carbon nano pipe array section of length diameter controllable precise and its preparation method and application |
| CN110282974A (en) * | 2019-06-28 | 2019-09-27 | 华南理工大学 | Oriented alignment magnetic carbon fiber graphene composite film and its preparation method and application |
| CN110282974B (en) * | 2019-06-28 | 2020-12-29 | 华南理工大学 | Oriented magnetic carbon fiber graphene composite membrane and preparation method and application thereof |
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