CN105023692A - Multiferroic liquid and preparation method thereof - Google Patents
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Abstract
The invention discloses a multiferroic liquid and a preparation method of the multiferroic liquid. The multiferroic liquid of the invention is obtained via the following steps: uniformly mixing a base fluid and a surface active agent as a mixed liquid; then adding ferroelectric nano-particles and magnetic nano-particles in the mixed liquid, shaking the mixture and putting the mixture in a sealed container, and putting the container in a shaking table to shake for more than half an hour to make nano-particles evenly dispersed in the mixed liquid, thereby obtaining a stable suspension liquid, namely the multiferroic liquid. The multiferroic liquid of the invention not only has magnetism and ferroelectricity, but also has fluidity, and is very sensitive to a magnetic field and an electric field. Compared with solid ferroelectric material, the multiferroic liquid of the invention has smaller coercive force, and the particles are easy to rotate under the electric field or the magnetic field. The multiferroic liquid of the invention also has a magneto-optic effect and a refraction effect, which are not possessed by the solid multiferroic material. The invention presents the multiferroic liquid and the preparation method of the multiferroic liquid for the first time so as to develop a new direction for researching the multiferroic material.
Description
Technical field
The invention belongs to multi-ferroic material field, be specifically related to a kind of multiferroic liquid and preparation method thereof.
Background technology
The Schmid of Switzerland in 1994 clearly proposes this concept of multi-ferroic material, multi-ferroic material (mutliferroic) refer to material same mutually in comprise the key property of two kinds and two or more iron, the key property of these iron comprises ferroelectricity (anti-ferroelectricity), ferromagnetism (antiferromagnetism, ferrimagnetism) and ferroelasticity.There is spontaneous polarization sequence and spin sequence at a certain temperature in this kind of material simultaneously, the magnetoelectric effect caused is there is just while them, multiferroic is made to have some special physical property, cause some newly, significant physical phenomenons, as: produce electric polarization or induction ferroelectric phase transition under the influence of a magnetic field; Magnetic field or induction ferromagnetic phase transition is produced under electric field action; Near Curie temperature ferromagnetic phase transition point, produce the sudden change of dielectric constant, multi-ferroic material has become the current focus studied in the world.
Ferroelectric material has excellent ferroelectric, the characteristic such as dielectric, pyroelectric, electro-optical characteristic, acousto-optic performance, nonlinear optics, they have very important application in the solid state device such as ferroelectric memory, Infrared Detectors, transducer, surface acoustic wave, integrated optoelectronic device, capacitor, and this has also greatly promoted the research and development of ferroelectric material and feroelectronics.Ferroelectric Random Access Memory based on ferroelectric material has huge application prospect due to features such as its non-volatile and reading speed are fast.Ferroelectric material and application study thereof have become one of Condensed Matter Physics, research topic that solid electronics field is the most popular.
There is at present ferroelectric order and the orderly material of magnetic is also few simultaneously, typically have bismuth ferrite (BiFeO
3, be called for short BFO), mangaic acid bismuth (BiMnO
3, be called for short BMO), sieve breath salt (NaKC
4h
4o
6.4H
2o), BaFe
12o
19deng.Nonetheless, the multi-ferroic material of research is at present all solid-state, comprises multiferroic pottery, multiferroic film, multiferroic monocrystalline etc.Solid-state multi-ferroic material has the following disadvantages: 1, the coercive force of solid-state multi-ferroic material is larger, when carry out modulator magnetic with magnetic field or electric field or ferroelectric time, the magnetic field of needs or electric field are also just larger; 2., in time studying its magnetoelectric effect, find that the weak change of Benefit Transfer is not obvious; 3. apply electric field excessive easily by multi-ferroic material damage, cause waste of material; 4. multi-ferroic material just can not change once its structure shaping.
Owing to there is at present ferroelectric order and the orderly monophase materials of magnetic is few simultaneously, and these materials or be that magnetic is strong not, be exactly that ferroelectricity is more weak, or be exactly Curie temperature lower (only have and at low temperatures just there is magnetic and ferroelectricity).Liquid multi-ferroic material have not been reported, and does not also have " multiferroic liquid " this concept in the world.This is because, when multi-ferroic material is in liquefaction then, temperature is general all higher than its ferroelectrie Curie temperature or ferromagnetic Curie temperature, and now multi-ferroic material has lost ferroelectricity and (or) ferromagnetism (or ferrimagnetism, antiferromagnetism).Therefore, this concept that we propose first " multiferroic liquid ", and give its preparation method.
Summary of the invention
In order to solve the deficiency of above-mentioned solid-state multi-ferroic material, the invention provides a kind of multiferroic liquid with and preparation method thereof.
The present invention is achieved through the following technical solutions:
A kind of multiferroic liquid, comprise the nano particle of magnetic, ferroelectric nano particle, base fluid, surfactant, described base fluid and described surfactant are uniformly mixed into mixing material, and the nano particle of described magnetic, ferroelectric nano particle are dispersed in described mixing material and form stable suspension.
Further, the Li Jing≤20nm of the nano particle of described magnetic.
Further, the Li Jing≤20nm of described ferroelectric nano particle.
Further, described base fluid is water, organic liquid or aqueous organopolysiloxane.
Further, described base fluid is silicone oil, detergent alkylate or Polybutene oil.
Further, described surfactant is oleic acid, aminododecane, fluorine ether acid, laurate, phenyl undecanoic acid at least one.
Prepare the method for above-mentioned arbitrary described multiferroic liquid, comprise the following steps:
Prepare dry magnetic nanoparticle, dry ferroelectricity nano particle, base fluid and surfactant;
Be mixing material base fluid and surfactant Homogeneous phase mixing, the nano particle of magnetic, ferroelectric nano particle are joined in mixing material, rock and avoid nanoparticle agglomerates, precipitation, again mixing material to be loaded in the container of sealing and to be placed on shaking table and to shake, until form stable suspension, namely obtain multiferroic liquid.
Further, be dispersed in uniformly in described mixing material form stable suspension to make nano particle, the shaking table shake time is greater than half an hour.
Beneficial effect of the present invention:
1, for solid-state multi-ferroic material, its coercive force is larger, when carry out modulator magnetic with magnetic field or electric field or ferroelectric time, magnetic field or the electric field of needs are larger.And multiferroic liquid, due to nanoparticle suspension in a liquid, nano particle is subject to the impact of Brownian movement, and the resistance of liquid for nanoparticle movement is much little relative to solid.Under electric field (magnetic field) effect, nano particle can rotate in a liquid, and its magnetic moment direction or polarised direction just can correspondingly change; But inside solid-state multi-ferroic material, crystal grain obviously can not rotate, resistance is very large.
2, for solid-state multi-ferroic material, when its magnetoelectric effect of research, find that magnetoelectric effect is more weak.And suspend in multiferroic liquid state magnetic nano particle and ferroelectric nano particle, when applying electric field, ferroelectricity nano particle just rotates, electric dipole moment (electric moment) will turn to direction of an electric field, and form chain, and make in a liquid electric moment rotate required for electric field much smaller than solid-state multi-iron material.Rotate or other motion mode process in, ferroelectricity nano particle can be had an effect with magnetic nanoparticle, thus has influence on the position of magnetic nanoparticle, direction, shape, thus realizes the regulation and control of electric field to multiferroic liquid magnetic.Otherwise when applying magnetic field, the magnetic moment of magnetic nanoparticle will in ease rotation under magnetic direction, motion form chain.Rotating in meeting or other process of moving, magnetic nanoparticle will affect the position of ferroelectricity nano particle, direction, shape, thus plays regulating and controlling effect to the ferroelectricity of multiferroic liquid.Therefore, as long as apply very little electric field or magnetic field, electric moment direction (polarised direction) or magnetic moment direction just can be made to rotate, the athletic meeting of ferroelectricity nano particle acts on magnetic nanoparticle, otherwise the motion of magnetic nanoparticle under magnetic field can affect ferroelectricity nano particle again, thus realize and improve the magnetoelectric effect of multiferroic liquid.
3, for solid-state multi-ferroic material, apply electric field excessive, multi-ferroic material is easily damaged by electric field breakdown, and this puncturing is permanent, can not recover, and causes the waste of multi-ferroic material.And multiferroic liquid, after some points are broken down by electric field breakdown, only need to remove electricity (magnetic) field, again rock multiferroic liquid, and then apply electricity (magnetic) field, multiferroic liquid can recover again to re-use.And multiferroic liquid only needs very little electric field just can change its polarised direction, be therefore also not easy breakdown.
4, for solid-state multi-ferroic material, structure, once shaping, just can not change.And for multiferroic liquid, due to the mobility of liquid, its internal structure is transformable.After electricity (magnetic) field is applied to multiferroic liquid, the length thickness of nano chain can be changed easily.And, electricity (magnetic) field can be applied as required, do not need with time just not to electricity (magnetic) field, just apply electricity (magnetic) field, electricity (magnetic) field when needing, after being finished, just can remove electricity (magnetic) field.And by changing the parameter such as size, direction, gradient of electricity (magnetic) field, can arbitrarily control the structure of nano chain.As, make photovoltaic cell, use solid-state multi-ferroic material, the thickness of thin layer is exactly constant, and the distance between electrode, the area of electrode are all constant; If nano wire, so the length thickness distance of nano wire is all invariable.Use multiferroic liquid, then by changing the factors such as electricity size direction, (magnetic) field, the length thickness distance of nano chain can be changed.
5, multiferroic liquid has the performance that magneto optical effect, refraction effect do not have in solid-state multi-ferroic material.
6, under electric field or magnetic fields, in solid-state multi-ferroic material, the orientation of electricdomain can only along some orientation close to direction of an electric field, might not along direction of an electric field, and for multiferroic liquid, because nano particle can freely rotate in a liquid, therefore the orientation of its electricdomain can completely along direction of an electric field.
Because multiferroic liquid has multiferroic and mobility simultaneously, there is ferroelectric of many uniquenesses, fluid mechanics, optics and acoustic characteristic.When multiferroic liquid is placed in the uniform electric field of some strength, when a branch of polarised light passes, the electric vector of polarised light is parallel to external electric field direction and can there are differences perpendicular to external electric field direction absorbing state, thus optically anisotropy, will produce a series of electro optic effect such as Faraday effect, birefringence effect.The estimation in alternating field of multiferroic liquid can have the phenomenons such as conductivity frequency dispersion, ferroelectric viscosity.Equally, the magnetic of multiferroic liquid can be controlled by electric field, also can apply magnetic field conversely to change its electrical property.
In a word, the present invention proposes multiferroic liquid concept first and discloses the preparation method of multiferroic liquid, research for multi-ferroic material opens a brand-new research direction, thus widened the research range of multi-ferroic material, can carry out furtheing investigate and being used according to the different performance of multiferroic liquid, thus multi-ferroic material is applied more fully.Multiferroic liquid of the present invention is that magnetic nanoparticle and ferroelectricity nano particle are dispersed in base fluid and form stable suspension, this multiferroic liquid has magnetic, ferroelectricity and mobility simultaneously, in theory, provide a kind of brand-new while there is the multi-ferroic material of ferroelectricity and magnetic, the range of application of multiferroic liquid of the present invention will be broader than solid-state multi-ferroic material.
Accompanying drawing explanation
Fig. 1 is multiferroic liquid schematic diagram of the present invention;
Fig. 2 is that multiferroic liquid of the present invention forms chain along magnetic direction magnetic nanoparticle in multiferroic liquid under magnetic field;
Fig. 3 is that multiferroic liquid of the present invention forms chain along direction of an electric field ferroelectricity nano particle in multiferroic liquid under the electric field;
Under Fig. 4 Electric and magnetic fields that to be multiferroic liquid of the present invention apply at equidirectional, in multiferroic liquid, nano particle forms chain along the direction of Electric and magnetic fields;
Fig. 5 is the situation of change of multiferroic liquid of the present invention its light transmittance under different magnetic field;
The situation of change of Fig. 6 its light transmittance that is multiferroic liquid of the present invention under not same electric field.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
A kind of multiferroic liquid, comprise the nano particle of magnetic, ferroelectric nano particle, base fluid, surfactant, described base fluid and described surfactant are uniformly mixed into mixing material, and the nano particle of described magnetic, ferroelectric nano particle are dispersed in described mixing material and form stable suspension.Described ferroelectric nano particle is barium titanate (BTO), lead zirconate titanate (PZT) or tri-iron tetroxide (Fe
3o
4), the nano particle of described magnetic is Conjugate ferrite (CoFe
2o
4, write a Chinese character in simplified form CFO) or γ-Fe
2o
3(those skilled in the art should know also can select other ferroelectric materials and magnetic material as required).Described nano particle is nanoparticle or the nano wire with ferroelectricity (or magnetic).Li Jing≤the 20nm of the nano particle of described magnetic.Li Jing≤the 20nm of described ferroelectric nano particle.The particle diameter of nano particle is the smaller the better, and particle diameter is less, and due to coulomb motion, nano particle is just less likely to occur precipitation.Otherwise particle diameter is larger, owing to being subject to Action of Gravity Field, just easily precipitating, can not suspension be formed.If particle diameter is large, just must selects the base fluid body that density is also very large, offset gravity with buoyancy, just harsher to the selection of base fluid like this, alternative base fluid is just fewer.Described base fluid is water, organic liquid or aqueous organopolysiloxane.In order to characterize the multiferroic of multiferroic liquid, just need to apply electric field or magnetic field to multiferroic liquid, make the nano particle of the ferroelectric nano particle in liquid or magnetic polarized.Therefore, the liquid that base fluid just should select conductivity very poor, such as close to the grease class of insulation, should have some other performance in addition: breakdown strength is high, dielectric loss angle tangent is little, and insulation resistivity is high, and relative dielectric constant is little; Next has excellent process based prediction model.As vapourizing temperature is high, flash-point is high, and difficulty is fired or do not fired as far as possible; Solidifying point is low, suitable viscosity and viscosity-temperature profile; Thermal conductivity is large, and specific heat capacity is large; Heat stability is good, resistance to oxidation; Inspiratory little under electric field action; Compatibility between it and the solid material contacted with it will be got well; Toxicity is low, easily biological-degradable.Also require that source is wide, price is low.Preferably for the silicone oil under high temperature, detergent alkylate or polybutene wet goods.Select the surfactant oleic acid, aminododecane, fluorine ether acid, laurate or the phenyl undecanoic acid that match with the dielectricity of base fluid.Selected surfactant can be dissolved in again in selected base fluid by coated described nano particle.And the total volume fraction of ferroelectricity nano particle and magnetic nanoparticle is preferably no more than 20%, volume fraction is larger more easily reunites, and finally precipitates, and can not form stable suspension.Volume fraction is excessive, and the requirement of Surfactant and base fluid is higher, can select scope narrower.Except specific demand, total volume fraction can be more stable within 5%, not easily reunites, precipitates.
The preparation of BTO-CFO multiferroic liquid:
1st step: prepare ferroelectric BTO nano particle with sol-gel process
1) preparation of barium precursor liquid: join in barium acetate by appropriate glacial acetic acid, is placed in 80 DEG C of thermostat water bath heating for dissolving, is transferred in volumetric flask after cooling, adopts buret to drip ethylene glycol ethyl ether constant volume and namely obtains Ba precursor liquid.2) preparation of titanium precursor liquid: join in butyl titanate as mixed solvent using glacial acetic acid and ethylene glycol ethyl ether, transfers in volumetric flask after dissolving, and adopts buret instillation ethylene glycol ethyl ether constant volume namely to obtain Ti precursor liquid.Ti precursor liquid is added drop-wise in Ba precursor liquid, adds appropriate acetylacetone,2,4-pentanedione after dropping to adjust dissolved adhesiveness, after mixing, namely obtained the colloidal sol of pure barium titanate through 24 hours.If the colloidal sol of barium titanate doping need be prepared, only need add appropriate La precursor liquid, Nd precursor liquid or Co precursor liquid simultaneously, after hours aging through 24, namely obtain the colloidal sol of barium titanate doping.If be necessary, ethanol in proper amount amine also can be added to control the viscosity of colloidal sol.Then being toasted on heating station by the solution obtained, put into box type furnace and sinter after drying, is 900 DEG C in sintering temperature, and the time is 2h.After fully being ground by products therefrom, obtain BTO nano particle.
2nd step: coprecipitation prepares CoFe
2o
4(CFO) magnetic nanoparticle
By FeCl
36H
2o (0.04mol, 100mL) and Co (NO
3)
26H
2o (0.02mol, 100mL) mixes, and adds NaOH (0.35mol, 500mL), then mixed solution is heated to boiling, and rapid stirring, the boiling of companion take off natural sedimentation after continuing 1min; Abundant precipitation uses the H (NO) of 1mol/L afterwards
3solution cleans sediment until pH value is 7, then cleaning products therefrom is obtained required CFO magnetic nanoparticle after the operations such as acetone dehydration, drying.
3rd step: the preparation of BTO-CFO multiferroic liquid
The features such as silicone oil has high-low temperature resistant, chemical stability is good, steam forces down, viscosity temperature influence is little are the desirable carrier fluids of multiferroic liquid.But the characteristic of silicone oil water and oil repellence makes the surfactant by ferroelectricity BTO and magnetic CFO particulate homogenous are scattered in wherein must have oleophylic performance, and energy coated magnetic particle and ferroelectricity particle, otherwise easily there is the phenomenons such as reunion, sedimentation.Select oleic acid as surfactant.
Preparing magnetic nanoparticle volume fraction is 5%, the BTO-CFO multiferroic liquid that ferroelectricity nano particle integration number is also 5%, cumulative volume is 100ml.
Method one:
Required BTO and CFO nano particle volume is 5ml, and its density is about 6g/cm
3, then the quality of BTO and CFO is needed to be all 30g; The concentration of oleic acid is 2%, then need the oleic acid measuring 2ml; The volume of silicone oil is 100-10-2=88ml.
First, (volume is about 5cm to weigh the BTO nano particle of 30g
3) and the CFO nano particle of 30g (volume is about 5cm
3), BTO nano particle and CFO nano particle are added in the mixed uniformly mixing material of 2ml oleic acid and 88ml silicone oil, rock, avoid particle agglomeration, precipitation, again seal of vessel when shake (prevent shake out container) being placed on shaking table that mixing material is housed is shaken, shaking table carries out shake about 1 hour.Namely the BTO-CFO multiferroic liquid that ferroelectricity nano particle volume integral number is 5%, magnetic nanoparticle volume fraction is also 5%, cumulative volume is 100ml is obtained.
Method two:
The BTO ferroelectricity liquid mother liquor that preparation BTO ferroelectricity nano particle volume integral number is 5%, cumulative volume is 100ml:
Required BTO nano particle volume is 5ml, and its density is about 6g/cm
3, then the quality of BTO is needed to be 30g; The concentration of oleic acid is 2%, then need the oleic acid measuring 2ml; The volume of silicone oil is 100-5-2=93ml.
First, (volume is about 5cm to weigh the BTO nano particle of 30g
3), BTO nano particle is added in the mixed uniformly mixing material of 2ml oleic acid and 93ml silicone oil, rock, avoid particle agglomeration, precipitation, again seal of vessel when shake (prevent shake out container) being placed on shaking table that mixing material is housed is shaken, shaking table carries out shake about 1 hour.Namely the BTO ferroelectricity liquid mother liquor that ferroelectric nanoparticles volume fraction is 5%, cumulative volume is 100ml is obtained.
The CFO magnetic liquid mother liquor that preparation CFO magnetic nanoparticle volume fraction is 5%, cumulative volume is 100ml:
Required CFO nano particle volume is 5ml, and its density is about 6g/cm
3, then the quality of CFO is needed to be 30g; The concentration of oleic acid is 2%, then need the oleic acid measuring 2ml; The volume of silicone oil is 100-5-2=93ml.
First, (volume is about 5cm to weigh the CFO nano particle of 30g
3), again CFO nano particle is added in the mixed uniformly mixing material of 2ml oleic acid and 93ml silicone oil, rock, avoid particle agglomeration, precipitation, again seal of vessel when shake (prevent shake out container) being placed on shaking table that mixing material is housed is shaken, shaking table carries out shake about 1 hour.Namely the CFO magnetic liquid mother liquor that magnetic nanoparticle volume fraction is 5%, volume is 100ml is obtained.
Measure the BTO ferroelectricity liquid mother liquor of 50ml and the CFO magnetic liquid mother liquor of 50ml respectively and mixed, seal and be placed on shaking table and shake 1 hour, and obtain the BTO-CFO multiferroic liquid that ferroelectricity nano particle volume integral number is 5%, magnetic nanoparticle volume fraction is also 5%, cumulative volume is 100ml.
The base fluid that configuration BFO multiferroic liquid mother liquor and CFO magnetic liquid mother liquor use and surfactant are all identical, perhaps there will be deposited phenomenon after preventing the two mixing.
Method two also first can prepare the not identical ferroelectricity liquid mother liquor of volume fraction and magnetic liquid mother liquor, then need according to configuration the ferroelectricity liquid mother liquor and the magnetic liquid mother liquor that measure respective volume respectively, add the mixing material of a certain amount of base fluid or base fluid and surfactant again, on shaking table, shake is until form stable suspension, thus obtains multiferroic liquid.
In sum, we can according to the needs of research, the ferroelectricity nano particle of configuration different volumes percentage and the multiferroic liquid of magnetic nanoparticle.Study by the shape of Magnetic control ferroelectricity nano particle, motion, proportion so shared by magnetic nanoparticle should be relatively larger, preferably account for the 30%-80% of total nano particle volume, lower than 30%, though the motion of magnetic nanoparticle and shape have a certain impact to ferroelectricity nano particle, but do not have crucial effect; If more than 80%, although magnetic nanoparticle can significantly have influence on ferroelectricity nano particle, the ratio of ferroelectricity nano particle is due to too little, and performance change can not be very large.Otherwise, if need the motion conditions of research magnetic nanoparticle, character or the relation between structure and other character, so in order to regulate and control the structure of ferroelectricity nano particle by electric field thus regulate and control magnetic nanoparticle, then ferroelectricity nano particle accounts for total particulate volume and is preferably 30%-80%.
As shown in Figure 1, in Fig. 1, the circle of black represents the magnetic nano particle of tool, can be CFO, Fe
3o
4deng.The circle representative of grey has ferroelectric nano particle, can be BTO, PZT etc.Regional Representative's base fluid of grey can be water, acid, oil, hydrocarbon etc.
Shown in Fig. 2, after vertically applying magnetic field, the magnetic nano particle of tool, just along the direction ordered arrangement in magnetic field, forms chain, can regulate and control other character, such as light transmission.In addition, ferroelectric nano particle also can be moved under the effect of magnetic nano chain, illustrates and not only can regulate and control magnetic by magnetic field, can also regulate and control electric property by magnetic field.
Shown in Fig. 3, after vertically applying electric field, there is ferroelectric nano particle just along the direction ordered arrangement of electric field, form chain, other character can be regulated and controled, such as light transmission.In addition, the magnetic nano particle of tool also can be moved under the effect of ferroelectricity nano chain, illustrates and not only can regulate and control ferroelectricity by electric field, can also regulate and control magnetic performance by electric field.There is certain using value in transducer, air locking etc.
As shown in Figure 4, after vertically applying Electric and magnetic fields, have ferroelectric nano particle just along the direction ordered arrangement of electric field, form chain, the magnetic nano particle of tool just also forms chain under magnetic fields simultaneously, as shown in Figure 4 simultaneously.Like this, just can regulate and control other character by Electric and magnetic fields, such as light transmission, ferroelectricity, magnetic, mobility etc., have certain using value.
As shown in Figure 5, ferroelectricity nano particle and magnetic nanoparticle total volume fraction are the multiferroic liquid of 10%, and ferroelectricity nano particle and magnetic nanoparticle volume fraction are all the multiferroic liquid of 5%, and after adding magnetic field, the transmissivity of light is along with the change of time.Can find that the transmissivity of magnetic field to light has certain regulating and controlling effect.As shown in Figure 6, ferroelectricity nano particle and magnetic nanoparticle total volume fraction are the multiferroic liquid of 10%, and ferroelectricity nano particle and magnetic nanoparticle volume fraction are all the multiferroic liquid of 5%, and after added electric field, the transmissivity of light is along with the change of time.In a, electric field is that in 200kV/m, b, electric field strength is 500kV/m.Can find that the transmissivity of electric field to light has certain regulating and controlling effect.
Claims (8)
1. a multiferroic liquid, it is characterized in that: comprise the nano particle of magnetic, ferroelectric nano particle, base fluid, surfactant, described base fluid and described surfactant are uniformly mixed into mixing material, and the nano particle of described magnetic, ferroelectric nano particle are dispersed in described mixing material and form stable suspension.
2. multiferroic liquid according to claim 1, is characterized in that: the Li Jing≤20nm of the nano particle of described magnetic.
3. multiferroic liquid according to claim 1, is characterized in that: the Li Jing≤20nm of described ferroelectric nano particle.
4. multiferroic liquid according to claim 1, is characterized in that: described base fluid is water, organic liquid or aqueous organopolysiloxane.
5. multiferroic liquid according to claim 1, is characterized in that: described base fluid is silicone oil, detergent alkylate or Polybutene oil.
6. multiferroic liquid according to claim 1, is characterized in that: described surfactant is oleic acid, aminododecane, fluorine ether acid, laurate, phenyl undecanoic acid at least one.
7. prepare the method for the arbitrary described multiferroic liquid of claim 1-6, it is characterized in that: comprise the following steps:
Prepare dry magnetic nanoparticle, dry ferroelectricity nano particle, base fluid and surfactant;
Be mixing material base fluid and surfactant Homogeneous phase mixing;
The nano particle of magnetic, ferroelectric nano particle are joined in mixing material, rock and avoid nanoparticle agglomerates, precipitation, again mixing material to be loaded in the container of sealing and to be placed on shaking table and to shake, until form stable suspension, namely obtaining multiferroic liquid.
8. the method preparing multiferroic liquid according to claim 7, is characterized in that: the shaking table shake time is greater than half an hour.
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