CN110323056A - A method of it solving magnetic nanoparticle and reunites in magnetic nanometer composite material - Google Patents
A method of it solving magnetic nanoparticle and reunites in magnetic nanometer composite material Download PDFInfo
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- CN110323056A CN110323056A CN201910576915.XA CN201910576915A CN110323056A CN 110323056 A CN110323056 A CN 110323056A CN 201910576915 A CN201910576915 A CN 201910576915A CN 110323056 A CN110323056 A CN 110323056A
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- magnetic
- magnetic nanoparticle
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
Abstract
The invention discloses a kind of methods that solution magnetic nanoparticle is reunited in magnetic nanometer composite material, when magnetic nanoparticle with one-domain structure is mixed with matrix powder, since magnetic force is greater than gravity between magnetic nanoparticle, the attraction of magnetic force inevitably results in reunites between magnetic nanoparticle, influences the performance of magnetic nanometer composite material.Pass through mictomagnetism nano particle and matrix powder under the Curie temperature for being higher than magnetic nanoparticle, since magnetic nanoparticle ferromagnetic transition is paramagnetism, magnetic interaction disappears, magnetic nanoparticle is no longer reunited due to magneticaction, and mixed-powder pressure is formed into block at such a temperature, to solve the problems, such as that magnetic nanoparticle is reunited in magnetic nanometer composite material.It is this method simple process, low in cost, more effective feasible, it is of universal significance to magnetic nanoparticle agglomeration traits in magnetic nanometer composite material are solved.
Description
Technical field
The invention belongs to magnetic nanometer composite material preparation method technical fields, and in particular to a kind of solution magnetic Nano
The method that grain is reunited in magnetic nanometer composite material.
Background technique
Reunion refers to that the behavior of particle at this time is no longer by gravity when the active force between material granule is much larger than gravity
Constraint, and mutually drawn close under the influence of inter-particle force to which there is a phenomenon where assemble.Magnetic nanoparticle is in recent years
It quickly grows and the new material of great application value, is led in biotechnology, biomedicine, material science, engineering and environment etc.
Domain is widely applied.It is magnetic since the magnetic force between the magnetic nanoparticle of single domain is greater than gravity especially in terms of magnetic composite
Nano particle will necessarily reunite when mixing with matrix powder.And then influence whether mechanics, the heat of magnetic nanometer composite material
The macro properties such as, magnetics, electricity, because the tightness degree to interact between performance and nano particle in macro-scale has
It closes, in order to obtain the magnetic nanometer composite material of excellent properties, it is essential prerequisite for avoiding the reunion of magnetic nanoparticle
Condition.
Currently, solving the problems, such as that magnetic nanoparticle reunion receives the extensive concern of scientific research personnel.Chinese patent CN
Ferromagnetism powder reuniting degree measuring method in a kind of suspension system is disclosed in 108872287 A, ferromagnetism powder is worked as in discovery
Particle size can reunite when reaching submicron order or nanoscale.A kind of nothing is disclosed in Chinese patent CN101927193 A
The preparation method of agglomerative submicron nickel ferrite magnetic carrier, the sub-micron nickel ferrite based magnetic loaded precursor preparation coated by roasting oxidation aluminium
Non-agglomerative submicron nickel ferrite magnetic carrier.The magnetism that a kind of surface modification is disclosed in 108421533 A of Chinese patent CN is received
The preparation method of rice grain, ammonium hydroxide, which is added, makes magnetic mixed solution in alkalinity, obtains the magnetism that do not reunite by coprecipitation and receives
Rice grain.A kind of system of magnetic core-shell nanocomposite for loading nickel particle is disclosed in 107335403 A of Chinese patent CN
The magnetic core addition of coated silica layer is mixed in the phenol resin solution of nickel salt and coats novolac resin layer again by Preparation Method,
Roasting obtains the magnetic core-shell nanocomposite for the load nickel particle that do not reunite in inert environments.Chinese patent CN
108102109 A disclose a kind of magnetic nanoparticle polymer composites and preparation method thereof, by by Fe3O4Nanometer
Grain surface amino groups functionization processing prevents nano particle from reuniting in the composite.It is disclosed in 108249482 A of Chinese patent CN
A kind of magnetic Fe2O3The preparation method of nano particle and its method compound with nano-carbon material, by adding sodium acetate and 12
The weakly alkaline solutions such as sodium alkyl sulfate make magnetic nanoparticle adsorption anion, to prevent magnetic nanoparticle compound
Reunite in material.
From the current study, the existing side for solving magnetic nanoparticle agglomeration traits in magnetic nanometer composite material
Method are as follows: the magnetic nanoparticle that, cladding preparation modified by surface is not reunited, then it is mixed with magnetic with matrix powder
Property nanocomposite.However the complex process, at high cost, the magnetism and activation energy of the magnetic nanoparticle of preparation are dropped
It is low.Therefore a kind of simple process, low in cost, more effective feasible method are found to solve magnetic nanoparticle in magnetic Nano
Agglomeration traits are of great significance in composite material.
Summary of the invention
Based on the above the deficiencies in the prior art, the present invention is for the simple cheap effective solution magnetic Nano of shortage at present
Method this problem of grain agglomeration traits in magnetic nanometer composite material provides a kind of higher than magnetic nanoparticle Curie temperature
Magnetic nanoparticle is mixed with matrix powder in degree environment and mixed-powder is pressed into caked method, can be used for solving magnetism
The problem of nano particle is reunited in magnetic nanometer composite material.
In order to solve the above technical problem, the present invention provides a kind of solution magnetic nanoparticles in magnetic nanometer composite material
The method of middle reunion, which is characterized in that by magnetic nanoparticle in the temperature environment for being higher than magnetic nanoparticle Curie temperature
It is mixed with matrix powder, remains temperature-resistant, resulting mixed-powder pressure is then formed into block.
As an improvement of the above technical solution, it is characterised in that: the magnetic nanoparticle is the single domain magnetic of one-domain structure
Property nano particle.
As an improvement of the above technical solution, it is characterised in that: be mixed into and mix with matrix powder from magnetic nanoparticle
Powder presses the caked Curie temperature that temperature must be kept to be higher than magnetic nanoparticle in the process.
As an improvement of the above technical solution, it is characterised in that: the mixed method includes but is not limited to that mechanical stirring is mixed
It closes, magnetic agitation mixing, ultrasonic vibration mixing, solution distillation mixing, mixing drum mixing.
Selection for magnetic nanometer composite material matrix powder material can be inorganic material, organic material, powder grain
Diameter at least crosses 200 meshes, increases the contact area of matrix powder and magnetic nanoparticle, mixed-powder is made to be easier to mix.For
Above-mentioned powder mixed method, no matter using any, until mixing mixed-powder.
There are the interactions of magnetic force and gravity between the magnetic nanoparticle of one-domain structure, wherein the magnetic force to interact is big
It is small to be
K is proportionality coefficient, distance of the R between magnetic nanoparticle, m in formula1、m2It is total for the magnetic charge of magnetic nanoparticle
Amount.
The gravity of magnetic nanoparticle is
R is the radius of magnetic nanoparticle in formula,
Since magnetic nanoparticle is in nano-scale, and intergranular apart from close, i.e. formula (1), R, r in (2)
Be minimum value, magnetic interaction between magnetic nanoparticle is necessarily caused to be greater than gravity, i.e. F > G, magnetic Nano at this time
Particle is reunited under the sucking action of magnetic force.When magnetic nanoparticle is in the temperature environment higher than its Curie temperature
When, since magnetic nanoparticle is paramagnetism by ferromagnetic transition, the magnetic interaction between magnetic nanoparticle disappears at this time,
Power F=0 i.e. in formula (1), magnetic nanoparticle separate under gravity, and dispersed distribution is presented, and keep magnetic Nano
Particle is just no longer reunited in the temperature environment for being higher than its Curie temperature.
By analyzing above, when the magnetic nanoparticle with one-domain structure is mixed with matrix powder, due to magnetic Nano
Intergranular magnetic interaction is greater than gravity, and the attraction of magnetic force inevitably results in reunites between magnetic nanoparticle, shadow
Ring the performance of magnetic nanometer composite material.By be higher than magnetic nanoparticle Curie temperature under mictomagnetism nano particle with
Matrix powder, since magnetic nanoparticle ferromagnetic transition is paramagnetism, magnetic interaction disappears, and magnetic nanoparticle is no longer
Reunited due to magneticaction, and mixed-powder pressure is formed into block at such a temperature, to solve magnetic nanoparticle in magnetism
The problem of reuniting in nanocomposite.
Compared with prior art, technical solution of the present invention has the following beneficial effects: that solution provided by the invention is magnetic
The method that nano particle is reunited in magnetic nanometer composite material, in the temperature environment for being higher than magnetic nanoparticle Curie temperature
Mictomagnetism nano particle and matrix powder, and mixed-powder pressure is formed into block under the temperature environment, to make magnetic Nano
Magnetic nanoparticle in composite material is not reunited, and the dispersibility of magnetic nanoparticle is improved.The method that the present invention designs
Process flow is simple, low in cost, more effective feasible, is suitable for industrialized production, to preventing magnetic nanoparticle from receiving in magnetism
Reuniting in nano composite material has universal meaning.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, below in conjunction with preferred embodiment, detailed description are as follows.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, the attached drawing to embodiment is simply situated between below
It continues.
Fig. 1 is the schematic diagram in magnetic nanometer composite material in the case of magnetic nanoparticle reunion；
Fig. 2 is magnetic nanoparticle signal distributed relatively uniformly in the magnetic nanometer composite material of present invention process preparation
Figure.
Specific embodiment
The following detailed description of a specific embodiment of the invention, as part of this specification, by embodiment come
Illustrate that the principle of the present invention, other aspects of the present invention, feature and its advantage will become apparent by the detailed description.
Embodiment 1
1, by the mono domain magnetic nano particle of Gd and the Bi for crossing 400 meshes0.5Sb1.5Te3Powder is added in stirring vessel,
Under Curie temperature (about 20 DEG C) i.e. 50 DEG C of temperature environments higher than Gd, powder is stirred using churned mechanically method, is arranged
Speed of agitator: 800 revs/min, mixing time: 30 minutes.
2, the temperature environment for keeping 50 DEG C, by the mixed-powder in step 1, pressure forms block in stirring vessel, obtains magnetic
The non-aggregated magnetic Nano composite block material of nano particle can get finer and close magnetic Nano using subsequent machining technology
Particle magnetic Nano composite block material distributed relatively uniformly.
Embodiment 2
1, by LaFe11Co0.9Si1.1Mono domain magnetic nano particle and cross 400 meshes MgAgSb powder be added blender
In ware, it is being higher than LaFe11Co0.9Si1.1Curie temperature (about 21 DEG C) i.e. 50 DEG C of temperature environments under, using churned mechanically method
It is stirred powder, setting speed of agitator: 800 revs/min, mixing time: 30 minutes.
2, the temperature environment for keeping 50 DEG C, by the mixed-powder in step 1, pressure forms block in stirring vessel, obtains magnetic
The non-aggregated magnetic Nano composite block material of nano particle can get finer and close magnetic Nano using subsequent machining technology
Particle magnetic Nano composite block material distributed relatively uniformly.
Embodiment 3
1, by Ni55.2Mn18.6Ga26.2Mono domain magnetic nano particle be added to the container with nano-carbon material, pour into anhydrous second
Alcohol configures mixed solution, is being higher than Ni55.2Mn18.6Ga26.2I.e. 60 DEG C of Curie temperature (about 42 DEG C) at a temperature of using ultrasonic cleaning
It is uniformly mixed powder.
2, supersonic cleaning machine is continued to use, sets the mixed-powder solution in 60 DEG C of heating stepses 1 up to powder drying, and
Mixed-powder pressure is formed into block at such a temperature, obtains the non-aggregated magnetic Nano composite block material of magnetic nanoparticle, then
It can get finer and close magnetic nanoparticle magnetic Nano composite block material distributed relatively uniformly by subsequent machining technology.
Embodiment 4
1, by Ni50Mn37Sn13Mono domain magnetic nano particle and cross 400 meshes polyaniline microsphere be added stirring vessel
In, it is being higher than Ni50Mn37Sn13I.e. 50 DEG C of Curie temperature (about 22 DEG C) at a temperature of, be stirred using churned mechanically method
Powder, setting speed of agitator: 800 revs/min, mixing time: 30 minutes.
2, the temperature environment for keeping 50 DEG C, by the mixed-powder in 1, pressure forms block in stirring vessel, obtains magnetic Nano
It is more equal to can get finer and close magnetic nanoparticle using subsequent machining technology for the non-aggregated magnetic nanometer composite material of particle
The magnetic Nano composite block material of even distribution.
The bound of each raw material cited by the present invention and each raw material of the present invention, section value and technological parameter
Bound, the section value of (such as temperature, time) can realize the present invention, but not limited to this range, it is numerous to list herein
Embodiment.
The above is a preferred embodiment of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, it is noted that for those skilled in the art, without departing from the principle of the present invention, may be used also
To make several improvement and variation, these, which improve and change, is also considered as protection scope of the present invention.
Claims (3)
1. a kind of method for solving magnetic nanoparticle and reuniting in magnetic nanometer composite material, which is characterized in that be higher than magnetic
Property nano particle Curie temperature temperature environment in magnetic nanoparticle is mixed with matrix powder, maintain it is temperature-resistant, then
Resulting mixed-powder pressure is formed into block.
2. the method according to claim 1 for solving magnetic nanoparticle and reuniting in magnetic nanometer composite material, special
Sign is: the magnetic nanoparticle is the mono domain magnetic nano particle of one-domain structure.
3. the method according to claim 1 for solving magnetic nanoparticle and reuniting in magnetic nanometer composite material, special
Sign is: the mixed method includes but is not limited to mechanical stirring mixing, magnetic agitation mixing, ultrasonic vibration mixing, solution steaming
Evaporate mixing, mixing drum mixing.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107452457A (en) * | 2017-09-14 | 2017-12-08 | 兰州大学 | A kind of magnetic nanoparticle, preparation method and applications |
| US20180003676A1 (en) * | 2011-01-31 | 2018-01-04 | Korea University Research And Business Foundation | Magnetic nanoparticle, having a curie temperature which is within biocompatible temperature range, and method for preparing same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180003676A1 (en) * | 2011-01-31 | 2018-01-04 | Korea University Research And Business Foundation | Magnetic nanoparticle, having a curie temperature which is within biocompatible temperature range, and method for preparing same |
| CN107452457A (en) * | 2017-09-14 | 2017-12-08 | 兰州大学 | A kind of magnetic nanoparticle, preparation method and applications |
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Application publication date: 20191011 |