CN108037596A - A kind of apparatus and method for improving ferroelectricity liquid light switch characteristic - Google Patents
A kind of apparatus and method for improving ferroelectricity liquid light switch characteristic Download PDFInfo
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- CN108037596A CN108037596A CN201711172174.6A CN201711172174A CN108037596A CN 108037596 A CN108037596 A CN 108037596A CN 201711172174 A CN201711172174 A CN 201711172174A CN 108037596 A CN108037596 A CN 108037596A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/05—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect with ferro-electric properties
Abstract
The invention discloses a kind of apparatus and method for improving ferroelectricity liquid light switch characteristic, described device includes the vessel made of insulating materials, in vessel corresponding two sides, electrode is set, the electrode has two, respectively top electrode and bottom electrode, upper, projected electrode is set respectively on bottom electrode, the projected electrode is positioned at upper, between bottom electrode, by ferroelectricity as in said vesse, the present invention between plate electrode by introducing projected electrode, since projected electrode has smaller radius of curvature, when applying the voltage of formed objects between tablet, stronger electric field strength and electric-force gradient can be obtained, improve the response quautity of photoswitch, the characteristic of ferroelectricity liquid light switch may finally be improved.
Description
Technical field
The invention belongs to ferroelectric material field, and in particular to a kind of device for improving ferroelectricity liquid light switch characteristic and side
Method.
Background technology
Ferroelectric material has a variety of coupling properties such as ferroelectricity, ferroelasticity, pyroelectric, piezoelectricity and inverse piezoelectricity at the same time
And other unique physical properties, such as the electric thermal coupling property of power one, one optical coupling property of an electric sound, nonlinear optics effect
Should, switching characteristic etc., these properties make ferroelectric material obtain quite varied application.Device has made of ferroelectric material
Have a wide range of application, high sensitivity, high reliability.All these advantages all promote every country to put into large quantities of funds pair
Ferroelectric material is further studied.
However, the ferroelectric material studied at present is all solid-state, including ferroelectric ceramics, ferroelectric thin film, ferro-electricity single crystal etc..Liquid
Ferroelectric material have not been reported, so-called ferroelectricity liquid（Or it is ferroelectric fluids）(Ferroelectric fluids,
Ferroelectric liquid), do not mean that proper " liquid " ferroelectric substance（Material is in the temperature of liquid
All it is higher than its Curie temperature, so the ferroelectric substance there is presently no liquid）, and refer to by particle diameter 10-100nm's or so
It is dispersed in ferroelectric particulate in base fluid（fluid carrier）, pass through adion（Charge repulsion）Or
Surface takes long-chain molecule（Position power is repelled）The colloidal dispersion for the stabilization for reaching anti-agglomeration and being formed.Nanoparticle typically refers to have
There are ferroelectric nanoparticle or nano wire, base fluid is typically water, organic liquid or aqueous organopolysiloxane.Certainly, this liquid
Can also to be particle diameter be scattered in for micron-sized easily polarized particle compound hanging of being formed in the insulation liquid medium of low-k
Floating body.But, it is because ferroelectric material (be able to need not be applied with spontaneous polarization as dispersed particle why to select ferroelectric powder
Add what outfield just can be spontaneous to be in polarized state), only needing to apply less electric field in a liquid to rotate.
For solid ferroelectric material, ferroelectricity liquid under electric field action there is ferroelectric particulate can send out
It is raw to rotate, and since in a liquid, so its coercive electric field can be smaller, due to Brownian movement, steering under the electric field is more
Easily.Need to apply relatively large electric field in solids and could allow and change polarization direction, electric field be easy to cause greatly very much sample quilt
Breakdown.Under electric field action, in solid-state ferroelectric material electricdomain orientation can only along some orientations close to direction of an electric field, and
Not necessarily along direction of an electric field, and for ferroelectricity liquid, since ferromagnetic fine particles can be freely rotated in a liquid,
The orientation of its electricdomain can be completely along direction of an electric field.
When light beam is by ferroelectricity liquid, there is obvious difference to the transmitance of light before and after ferroelectricity liquid application electric field
（Transmitance is low before applying electric field.Transmitance is high after applying electric field）, photoswitch can be made using this feature, and switch
Corresponding speed directly determines its switching characteristic.Ferroelectricity liquid is exactly directly loadable into container by currently used method, directly
Electric field is applied to container.Since positive and negative electrode is typically parallel, the electric field formed between plate electrode is uniform electricity
.Before applying electric field to ferroelectricity liquid, particulate disorderly disperses in a liquid, as shown in Figure 1.
Since disordered state is presented in the distribution of particulate, when light beam irradiates from top to down, light is by the micro- of disorder distribution
Grain is reflected or scattered, and causes the light through ferroelectricity liquid weaker.
Ferroelectricity liquid forms chain after applying electric field to ferroelectricity liquid, as shown in Figure 2.
Since chain is presented in the distribution of particulate, when light beam irradiates from top to down, light can be easily from chain
Between pass through, cause the light through ferroelectricity liquid stronger.Therefore, to the light intensity before and after ferroelectricity liquid application electric field through liquid
Obvious change occurs, plays a part of " photoswitch ".
Obviously, applying after electric field particulate in ferroelectricity liquid and forming chain needs the time, and the time shorter shows light
The response of switch is faster, its performance is also better.First, the speed that ferromagnetic fine particles form nano chain is improved, raising can be passed through
The method of electric field obtains；Secondly, photoswitch ratio to be improved（The difference of the transmitance of light i.e. before and after raising application electric field）, Ke Yitong
Crossing makes it not block light as far as possible ferroelectric nano chain applying power, to improve the transmitance of light.
The content of the invention
For problems of the prior art, the present invention provides a kind of side for improving ferroelectricity liquid light switch characteristic
Method, can obtain stronger electric field strength and electric-force gradient, improve the response quautity of photoswitch, may finally improve ferroelectricity liquid light
The characteristic of switch.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of device for improving ferroelectricity liquid light switch characteristic, including the vessel made of insulating materials, in container sheet
The corresponding two sides of body set electrode, and the electrode has two, are respectively top electrode and bottom electrode, divide on upper and lower electrode
Projected electrode is not set, and the projected electrode is between upper and lower electrode.
The projected electrode is spherical, tooth form, cylinder, and the material of the projected electrode only needs conduction.
The projected electrode is ITO transparent conductive electrodes.
The electrode is ITO transparent conductive electrodes.
The method that the present invention improves ferroelectricity liquid light switch characteristic, step are as follows：
（1）Prepare ferroelectricity nanoparticle；
（2）Prepare ferroelectricity liquid：Ferroelectricity nanoparticle and oleic acid are uniformly dispersed in base fluid and obtain ferroelectricity liquid；
Wherein volume fraction of the ferroelectricity nanoparticle in ferroelectricity liquid is 5%, and oleic acid is in the volume fraction of ferroelectricity liquid
2%；Using oleic acid as surfactant, silicone oil has high-low temperature resistant, chemical stability is good, steam forces down, viscosity is by temperature shadow
The features such as small is rung, is the preferable carrier fluid of ferroelectricity liquid；But the characteristic of silicone oil water and oil repellence causes ferroelectricity BTO particulates
Oleophylic performance, and energy coated magnetic particulate must be had by being dispersed in surfactant therein, otherwise easily occurred reuniting, sunk
Phenomena such as drop；
（3）Prepare the device for improving ferroelectricity liquid light switch characteristic：ITO conductive electrodes are bought, or are sunk by pulse laser
Area method, magnetron sputtering method method prepare ITO conductions, the electrode of printing opacity；The substrate of ITO conductive electrodes is bonded in by insulating materials
The manufactured corresponding two sides of vessel, projected electrode is bonded in ITO electrode；
（4）By step（2）Obtained ferroelectricity liquid is placed in step（3）In the device made, electric field is applied to device so that
Ferroelectricity particulate in liquid is polarized, and the ferroelectricity of ferroelectricity liquid is characterized.
The step（1）Ferroelectricity nanoparticle be BTO nanoparticles or PZT nanoparticles.
The preparation method of the BTO nanoparticles is as follows：By Ba2O3And Ti2O3, compare Ba according to atomic molar:Ti =
1:1 ratio, which is fully ground, makes it uniformly mix；Then put the powder into and Muffle furnace is placed in the crucible cleaned up
In, in 900 DEG C of 10 h of first time pre-burning, tentatively into phase, products therefrom calcines 30 h after being fully ground at 1100 DEG C, makes
Raw material reacts completely, then carries out third time and be fully ground, and obtains BTO nanoparticles.
The step（2）In base fluid be silicone oil, detergent alkylate or Polybutene oil.
The principle of the present invention：First, after having made projected electrode, original uniform electric field (when plate area than plate it
Between distance it is much larger when, uniform electric field can be considered by the electric field produced between two tablets) no longer uniformly, in raised electricity
The electric field produced between pole is more stronger than slab construction, in this way, ferromagnetic fine particles can form chain faster after applying electric field.
In addition, close to the local electric-field strength of projected electrode, the local electric field away from projected electrode is weak, in each raised electricity
Around all form gradient electric field, under the action of this electric field, in Fig. 4 the ferroelectric nano chain in region shown in arrow due to towards
Between electrode（In figure, towards a left side or towards the right side）Convergence（Because big around the electric field ratio in region between the electrode, nano chain by
The attraction arrived is just bigger than other places）, the nano chain quantity in this region tails off, and the particle for not forming nano chain compares
It is few, smaller is blocked to light.
Electric field between projected electrode is stronger, if the direction incidence shown in light beam along arrow in Fig. 4, compared to
For Fig. 1, the light of transmission is more.Therefore, when the response of ferroelectricity liquid light switch can have both been improved through device as shown in Figure 4
Between, the response quautity of photoswitch can also be improved.
Response time is obviously related with the time of nano particle chaining, and the time formed needed for chain is shorter, accordingly faster.And
The time formed needed for chain is related with electric field strength, also related with the performance of nano particle, the easier easier formation of polarization
Chain；For ferroelectric material, due to spontaneous polarization, as long as soon as applying electric field, particulate stress at the same time, then rotates.
Chain will be formed under the action of electric field force.In general, electric field is stronger, polarization intensity is bigger, rotate after formed chain when
Between it is shorter；In addition, particle can also be subject to liquid to it when polarization direction is rotated along direction of an electric field after by electric field force
Resistance-drag force, and this power mainly the viscosity with liquid, particle size, rotate speed it is related.
So generally speaking, can be by improving the big ferromagnetic fine particles of electric-force gradient, selection polarization intensity, reducing particulate
Size, select the less liquid of viscosity to improve the time mutually responded, can also improve the response quautity of photoswitch, open and close state
The relative value of light intensity improves.Front and rear state of the response quautity depending on forming chain, such as the concentration of particulate, formation before formation chain
The number of chain, the thickness of chain after chain, and the concentration of particulate can carry out people in order to control when configuration before forming chain；Extremely
The number of chain, the thickness of chain after chain is formed, then can be regulated and controled by the intensity and gradient of electric field.
Beneficial effects of the present invention：The present invention by introducing projected electrode between plate electrode, due to projected electrode have than
Less radius of curvature, when applying the voltage of formed objects between tablet, can obtain stronger electric field strength and electric field ladder
Degree, improves the response quautity of photoswitch, may finally improve the characteristic of ferroelectricity liquid light switch.
Brief description of the drawings
Disordered state is presented for particulate in ferroelectricity liquid before application electric field in Fig. 1.
Fig. 2 is in chainlike distribution for particulate in ferroelectricity liquid after application electric field.
Fig. 3 is the apparatus structure schematic diagram that the present invention improves ferroelectricity liquid light switch characteristic（Raised electrode structure）.
Electric field distribution schematic diagrams of the Fig. 4 between projected electrode.
Fig. 5 is the ferroelectric hysteresis loop of BTO ferroelectricity liquid.
Fig. 6 is the electric leakage flow curve of BTO ferroelectricity liquid.
Light transmittances and response time of the Fig. 7 for ferroelectricity liquid after present invention application electric field.
Embodiment
The step of synthesizing ferroelectricity liquid：
(a) the ferroelectricity particle of nanoscale is synthesized, synthetic method has：It is microemulsion method, coprecipitation, ball-milling method, solid
Phase reaction method, biochemical method, sol-gal process and thermal decomposition method etc..
(b) it is dispersed in inside the base fluid of various polar/non-polars by nanoparticles stable, it is stable in order to obtain
Ferroelectricity liquid, the dispersant that the dielectricity with base fluid should be selected to match.Various surfactants, such as：Enuatrol（One
Kind organic matter）, aminododecane（dodecylamine）Etc. the dispersiveness being typically used in enhancing aqueous medium.
Requirement to base fluid：
So-called ferroelectricity liquid is formed since we there will be ferroelectric nanoparticle to be dispersed in base fluid,
In order to be characterized to the ferroelectricity of ferroelectricity liquid, it is necessary to apply electric field to ferroelectricity liquid so that in liquid
Ferroelectricity particulate is polarized.Therefore, base fluid should just select the very poor liquid of electric conductivity, such as the grease type close to insulation,
Should additionally have some other performance：Breakdown strength is high, and dielectric loss angle tangent is small, and insulation resistivity is high, normal with respect to dielectric
Number is small；Secondly with excellent physical and chemical properties.Such as vapourizing temperature height, flash-point is high, as far as possible fire retardant or non-ignitable；Solidification point
It is low, suitable viscosity and viscosity-temperature profile；Thermal conductivity is big, and specific heat capacity is big;Heat endurance is good, resistance to oxidation；Under electric field action
It is inspiratory small；Its compatibility between the solid material contacted will be got well；Toxicity is low, easily biological-degradable.Also require source
Extensively, price is low.Silicone oil and detergent alkylate, Polybutene oil such as being used under high temperature.
With reference to specific embodiment, the present invention will be further described.It is to be understood that following embodiments are merely to illustrate this
Not for limiting the scope of the invention, the person skilled in the art in the field can make one according to the content of foregoing invention for invention
A little nonessential modifications and adaptations.
The device of the raising ferroelectricity liquid light switch characteristic of the present embodiment, including the container sheet made of insulating materials
Body, electrode 1 is set in the corresponding two sides of vessel, and the electrode 1 has two, respectively top electrode and bottom electrode, on
Electrode and bottom electrode use ITO transparent conductive electrodes, set projected electrode 2, the projected electrode 2 respectively on upper and lower electrode
Between upper and lower electrode.
The projected electrode is spherical, tooth form, cylinder, and the material of the projected electrode only needs conduction, preferably
ITO transparent conductive electrodes.
The method of the raising ferroelectricity liquid light switch characteristic of the present embodiment, step are as follows：
（1）Prepare ferroelectricity BTO nanoparticles；
The method for preparing nanoparticle is very much, we are by taking solid reaction process prepares and has ferroelectric BTO particulates as an example：By raw material
Ba2O3, and Ti2O3, compare Ba according to atomic molar：Ti = 1：1 ratio and the purity of raw material calculate the required matter of each raw material
Amount, being fully ground makes it uniformly mix.Then put the powder into the crucible cleaned up and be placed in Muffle furnace,
900 oC first times pre-burning, 10 h, tentatively into phase.Products therefrom calcines 30 h after being fully ground in 1100 oC, makes raw material
Reaction completely.Third time is carried out again to be fully ground, and obtains BTO nanoparticles.
（2）Prepare BTO ferroelectricity liquid：BTO nanoparticles and oleic acid are uniformly dispersed in base fluid and obtain BTO iron
Conductive liquid；Wherein volume fraction of the BTO nanoparticles in BTO ferroelectricity liquid is 5%, and oleic acid is in BTO ferroelectricity liquid
Volume fraction be 2%；Concrete operations are：
The BTO nanoparticles of certain mass are uniformly dispersed in certain density silicone oil.Silicone oil has high-low temperature resistant, chemistry
Stability is good, steam forces down, viscosity is affected by temperature the features such as small, is the preferable carrier fluid of ferroelectricity liquid.But silicone oil is hated
Water, hate the characteristic of oil to have oleophylic performance so that ferroelectricity BTO particulates are dispersed in surfactant therein, and
, otherwise easily there is phenomena such as reuniting, sedimentation, surfactant is used as using oleic acid in energy coated magnetic particulate.
As requested, such as volume fraction is needed to configure as 5%, volume is the BTO ferroelectricity liquid of 100 ml, then,
Required BTO particulates volume is 5 ml, its density is about 6 g/cm3, then the quality for needing BTO is 30g；The concentration of oleic acid is
2%, then need to measure the oleic acid of 2ml；The volume of silicone oil is the ml of 100-5-2=93；Therefore, first, the BTO of 30 g is weighed
Nanoparticle (about 5 cm of volume3), add in the oleic acid of 2ml, shaken, be then uniformly dispersed in 93 ml silicone oil
In, put into the vial or other containers of good seal, about 1 hour is shaken on shaking table.Then volume is just obtained
Fraction is 5%, and volume is the BTO ferroelectricity liquid of 100 ml；
For the ferroelectricity liquid that volume fraction is 5%, as shown in Figure 5 and Figure 6, by ferroelectric hysteresis loop, its polarization intensity is about
For 0.01 μ C/cm2.When electric field strength is 10 kV/cm, leakage current density is about 2 μ A/cm2；
（3）Prepare the device for improving ferroelectricity liquid light switch characteristic：ITO conductance electrodes are bought, or by with pulse laser
Sedimentation magnetron sputtering method prepares ITO conductions, the electrode of printing opacity；Such as conductive oxide ITO, glass substrate is in acetone, alcohol
It is middle to be cleaned with ultrasonic wave, dry；Chip bench is polished with sand paper, and is cleaned up, the substrate heat conduction that will be dried
Elargol is sticked on chip bench, then blocks substrate with corresponding mask plate according to the shape, size, number of required electrode.Dry in the air
It is put into after dry in cavity on warm table, starts to vacuumize.Treat that air pressure is extracted into 10-4During Pa, chip bench is begun to warm up.Paying attention to should
Slow heating, is generally heated to 120 DEG C or so.After reaching target temperature, substrate is blocked with baffle, and be passed through required gas
To certain pressure intensity.The energy and frequency parameter of laser are set, pre-sputtering is carried out to remove the dirt on ito thin film surface, makes film
Expose fresh surface, the pre-sputtering time is generally 2 ~ 5 minutes；During pre-sputtering, the parameter such as adjustment laser optical path, range,
So that plumage brightness end and chip bench are tangent.Chip bench and film are rotated, and makes laser in X, Y direction particles；Treat temperature,
After stable gas pressure, baffle is removed, is deposited.Suitable sedimentation time is selected according to required film thickness, deposition terminates
Afterwards, certain gas and slow cooling are filled with as required；
It is corresponding that the substrate for preparing electrode by AB glue, 502 glue etc. is bonded in the vessel made of insulating materials
Both sides, by the projected electrode shown in Fig. 3（Can be the shape such as spherical, tooth form, cylinder, material only needs conduction）
It is bonded in using heat conduction elargol in ITO electrode.From surrounding and top with organic matter thin slice (or the film that other materials are done, this
The necessary decomposition temperature of material is relatively low, less than ferroelectric material, is preferably controlled in less than 500 degree) stick into rectangular parallelepiped structure.Such as long,
Wide, high is respectively 100 mm, 50mm, 10mm.It can also be processed by other methods, as shown in Figure 3；
（4）By step（2）Obtained BTO ferroelectricitys liquid is placed in step（3）In the container made, electric field is applied to container,
So that the ferroelectricity particulate in liquid is polarized, the ferroelectricity of ferroelectricity liquid is characterized.
Fig. 7 is the light transmittance and sound to that can change multiferroic liquid after the ferroelectricity liquid application electric field with projected electrode
Between seasonable, wherein the volume fraction of ferroelectricity liquid is 5%, and the time represents non-applied field before for 0；A is to have raised electricity in the application
It is that the device of pole obtains as a result, b be traditional plate electrode structures device result.It is all 500 kV/m to apply electric field, from Fig. 7
As can be seen that pass through light transmittance and sound to multiferroic liquid can be changed after the ferroelectricity liquid application electric field with projected electrode
Between seasonable：The response time of traditional structure is about 400 s, and the time of the application is about 90 seconds.Response time reaches for transmissivity
The time of maximum is returned to after to minimum value.
The basic principle and main feature and advantages of the present invention of the present invention has been shown and described above.The skill of the industry
Art personnel it should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and
Its equivalent thereof.
Claims (8)
1. a kind of device for improving ferroelectricity liquid light switch characteristic, including the vessel made of insulating materials, its feature
It is：In vessel corresponding two sides, electrode is set（1）, the electrode（1）There are two, be respectively top electrode and lower electricity
Pole, projected electrode is set on upper and lower electrode respectively（2）,
The projected electrode（2）Between upper and lower electrode.
2. the device according to claim 1 for improving ferroelectricity liquid light switch characteristic, it is characterised in that：
The projected electrode is spherical, tooth form, cylinder, and the material of the projected electrode only needs conduction.
3. the device according to claim 2 for improving ferroelectricity liquid light switch characteristic, it is characterised in that：
The projected electrode is ITO transparent conductive electrodes.
4. the device according to claim 1 for improving ferroelectricity liquid light switch characteristic, it is characterised in that：The electrode
（1）For ITO transparent conductive electrodes.
A kind of 5. method that ferroelectricity liquid light switch characteristic is improved using claim 1 described device, it is characterised in that step
It is as follows：
（1）Prepare ferroelectricity nanoparticle；
（2）Prepare ferroelectricity liquid：Ferroelectricity nanoparticle and oleic acid are uniformly dispersed in base fluid and obtain ferroelectricity liquid；
Wherein volume fraction of the ferroelectricity nanoparticle in ferroelectricity liquid is 5%, and oleic acid is in the volume fraction of ferroelectricity liquid
2%；
（3）Prepare the device for improving ferroelectricity liquid light switch characteristic：ITO conductive electrodes are bought, or are sunk by pulse laser
Area method, magnetron sputtering method method prepare ITO conductions, the electrode of printing opacity；The substrate of ITO conductive electrodes is bonded in by insulating materials
The manufactured corresponding two sides of vessel, projected electrode is bonded in ITO electrode；
（4）By step（2）Obtained ferroelectricity liquid is placed in step（3）In the device made, electric field is applied to device so that
Ferroelectricity particulate in liquid is polarized, and the ferroelectricity of ferroelectricity liquid is characterized.
6. the method according to claim 5 for improving ferroelectricity liquid light switch characteristic, it is characterised in that：The step
（1）Ferroelectricity nanoparticle be BTO nanoparticles or PZT nanoparticles.
7. the method according to claim 6 for improving ferroelectricity liquid light switch characteristic, it is characterised in that：The BTO receives
The preparation method of rice particulate is as follows：By Ba2O3And Ti2O3, compare Ba according to atomic molar:Ti = 1:1 ratio, which is fully ground, to be made
It is uniformly mixed；Then put the powder into the crucible cleaned up and be placed in Muffle furnace, it is pre- in 900 DEG C of first times
10 h are burnt, tentatively into phase, products therefrom calcines 30 h after being fully ground at 1100 DEG C, raw material is reacted completely, then carry out
Third time is fully ground, and obtains BTO nanoparticles.
8. the method according to claim 5 for improving ferroelectricity liquid light switch characteristic, it is characterised in that：The step
（2）In base fluid be silicone oil, detergent alkylate or Polybutene oil.
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