CN1365124A - Ferrite nano magnetic liquid - Google Patents
Ferrite nano magnetic liquid Download PDFInfo
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- CN1365124A CN1365124A CN 02112663 CN02112663A CN1365124A CN 1365124 A CN1365124 A CN 1365124A CN 02112663 CN02112663 CN 02112663 CN 02112663 A CN02112663 A CN 02112663A CN 1365124 A CN1365124 A CN 1365124A
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- magnetic liquid
- ferrite nano
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Abstract
The nano ferrite magnetic liquid consists of nano ferrite particle, composte surfactant coated to the surface of nano ferrite particle and proper base liquid. It is prepared through preparing nano ferrite particle or homogeneous about 10 nm size, coating composite surfactant, repeated washing with distilled water and acetone, mixing with base liquid while stirring and heating to form stable magnetic liquid, which can be maintained in gravitational field, magnetic field and electric field stably without deposition and lamination. The magnetic liquid has advantgaes viscosity of 50-10000 centipoises and saturated magnetization intensity of 100-500 guasses. It may be used in vacuum sealing, high quality loudspeaker, vibration damper, sealing, etc.
Description
The present invention relates to magnetic liquid, particularly ferrite nano magnetic liquid.
Magnetic liquid is the nano-scale magnetic particulate to be dispersed among the base fluid and the stable colloidal dispersion that constitutes is a class novel nano functional magnetic material.It is made up of magnetic particle, base fluid and stabilizer three parts.Magnetic particle can be ferromagnetic metal particulates such as iron, nickel, also can be ferrite class magnetic particle.Magnetic liquid is because magnetic particle wherein is enough little, so that it presents disorderly Brownian movement in base fluid, under the effect in gravity and electricity, magnetic field, all can not produce precipitation and cohesion, magnetic particle and base fluid are muddy to be integral, thereby magnetic liquid has magnetic and the mobile peculiar property that both unify.Because the special performance that magnetic liquid had gets more and more people's extensive concerning day by day.But in nearly all document of publishing, all focus on the performance of research magnetic liquid, or report its concrete applicable cases in a certain field, and about the preparation process of magnetic liquid, especially technology is simple and easy to do, with low cost, the preparation process of prepared magnetic liquid stable performance but seldom relates to.
Chinese patent CN1144967 " manufacture method of metal magnetic liquid and device " provides a kind of method for preparing metal magnetic liquid, but its apparatus and process is complicated, and output is difficult to improve, and cost is still higher, is difficult to promote the use of.Simultaneously because the very easily oxidation of iron nanoparticle, the present practical application of metal magnetic liquid few.
The invention reside in provides a kind of preparation method easy, the ferrite nano magnetic liquid that properties of product are good, that product relates to is water base, alkyl, dibasic acid esters based magnetic liquid, can satisfy the needs that vacuum seal, high-fidelity loudspeaker, vibration damping, water shutoff, envelope gas, magnetic region observation, Magnetic Isolation etc. are used respectively.
Ferrite nano magnetic liquid provided by the present invention mainly is made up of ferrite nano particulate, compound surfactant and suitable base fluid.Its concrete preparation process is as follows: it is even at first to prepare particle size distribution; Ferrite nano particulate about average grain diameter 10nm, coat suitable compound surfactant at microparticle surfaces then, to coat good particulate after distilled water, acetone clean repeatedly, join in the selected base fluid through processing such as fully stirring, dispersion, heating, form stable magnetic liquid, in gravitational field, magnetic field, electric field, can steady in a long-termly exist; Do not precipitate, not stratified.The viscosity 50-10000 centipoise of magnetic liquid, saturation magnetization 100～500 Gausses can regulate arbitrarily.
Chemical coprecipitation is adopted in the preparation of above-described ferrite nano particulate, and particle size distribution is even; About average grain diameter 10nm.With frerrous chloride (or ferrous sulfate), ferric trichloride is a raw material, also can add soluble zinc salt, manganese salt, cobalt salt etc., and ammoniacal liquor or NaOH are precipitation reagent.
Used compound surfactant is water base to be C
nH
2nO
2Or C
nH
2n-2O
2(n 〉=18) and linear alkyl benzene sulphonate, alkyl are C
nH
2nO
2Or C
nH
2n-2O
2(n 〉=18) and (RO)
2POOH (R is C6～C10 alkyl molecule), the dibasic acid esters base is (RO)
2POOH (R is C6～C10 alkyl molecule) and [RO (C
2H
4O)
n]
mPO (OH)
3-m(R is C
4～C
14Positive alkyl molecule, n gets 2～12, m is 1 or 2).The mass ratio of surfactant and magnetic particle is 1: 10～1: 2, and the reaction temperature of coating reaction is 60～95 ℃, and in 15～100 minutes reaction time, pH value is between 10～12.
Selected base fluid can be distilled water, has varsol of long-chain (can be mixture) or di esters reagent C
6H
4(COOR)
2, R is C
7～C
10Alkyl molecule also can insert CH between phenyl ring and the carboxyl
2, CH
2CH
2, dibasic acid esters can be the ortho position, also can be between the position.
Magnetic liquid provided by the present invention, comparatively stable because its magnetic particle is particle diameter 10nm left and right sides ferrite nano particulate, thereby its magnetic liquid performance is highly stable.
Below be embodiments of the invention (agents useful for same is chemical reagent among the embodiment), cited embodiment can be described more specifically the present invention, but the present invention does not limit because of following embodiment, can change in the scope that context adapts and implement, any situation all is included in the technical scope of the present invention.
By proper proportion preparation divalent iron salt, trivalent iron salt and soluble zinc salt, manganese salt, cobalt saline solution, add precipitation reagent to debita spissitudo under certain reaction temperature, after adding surfactant reaction appropriate time, add hydrochloric acid to finite concentration (PH=2～4), through distillation washing 8 times, acetone is washed 2 times, 60 ℃ of dry particulates that must coat, the surface coated particulate of 20g is joined in an amount of base fluid,, get the magnetic liquid of stable performance through disperseing, heating.
Table one, embodiment agents useful for same and proportioning
| Sequence number | ??Fe 3+∶Fe 2+∶M 2+ | Reagent | Precipitation reagent | Base fluid | Surfactant |
| ????1 | ????1.8∶1 | Frerrous chloride, iron chloride | ??NaOH | 35 milliliters of distilled water | C 18H 34O 2、 C 12H 25C 6H 4SO 3Na |
| ????2 | ????1.8∶0.8∶0.2 | Ferrous sulfate, iron chloride, zinc chloride | ??NaOH | 40 milliliters of distilled water | C 18H 36O 2、 C 12H 25C 6H 4SO 3Na |
| ????3 | ????1.8∶0.8∶0.2 | Ferrous sulfate, iron chloride, zinc chloride | ??NH 4OH | 30 milliliters of distilled water | C 18H 34O 2、 C 15H 23O(C 2H 4O) 6H |
| ????4 | ????1.8∶0.85∶0.15 | Ferrous sulfate, iron chloride, zinc chloride | ??NaOH | 30 milliliters of distilled water | C 18H 34O 2、 C 12H 25C 6H 4SO 3Na |
| ????5 | ????1.8∶0.85∶0.15 | Ferrous sulfate, iron chloride, zinc chloride | ??NH 4OH | 15 milliliters of phthalic acid two isocyanates | (C 6H 13O) 2POOH、 C 6H 13O(C 2H 4O) 3PO(OH) 2 |
| ????6 | ????1.8∶1 | Ferrous sulfate, iron chloride | ??NH 4OH | 20 milliliters of phthalic acid two heptyl esters | (C 8H 17O) 2POOH、 [C 4H 9O(C 2H 4O) 5] 2PO(OH) 2 |
| ????7 | ????1.8∶0.8∶0.2 | Ferrous sulfate, iron chloride, manganese nitrate | ??NaOH | 20 milliliters of dioctyl phthalates | (C 8H 17O) 2POOH、 [C 8H 17O(C 2H 4O) 6] 2POOH |
| ????8 | ????1.8∶0.8∶0.2 | Frerrous chloride, iron chloride, zinc chloride | ??NaOH | 15 milliliters of diisooctyl phthalates | (C 10H 21O) 2POOH、 C 10H 21O(C 2H 4O) 8PO(OH) 2 |
| ????9 | ????1.8∶0.85∶0.15 | Frerrous chloride, iron chloride, zinc chloride | ??NaOH | 25 milliliters of diisononyl phthalates | (C 7H 15O) 2POOH、 C 9H 19O(C 2H 4O) 5PO(OH) 2 |
| ????10 | ????1.8∶0.85∶0.15 | Frerrous chloride, iron chloride, zinc chloride | ??NH 4OH | 15 milliliters of dinonyl phthalates | (C 9H 19O) 2POOH、 [C 12H 25O(C 2H 4O) 9] 2POOH |
| ????11 | ????1.8∶0.85∶0.15 | Frerrous chloride, iron chloride, zinc chloride | ??NaOH | 25 milliliters of didecyl phthalates | (C 8H 17O) 2POOH、 [C 10H 21O(C 2H 4O) 7] 2POOH |
| ????12 | ????1.8∶0.85∶0.15 | Frerrous chloride, iron chloride, zinc chloride | ??NH 4OH | 20 milliliters of diisooctyl phthalates | (C 9H 19O) 2POOH、 C 11H 23O(C 2H 4O) 12PO(OH) 2 |
| ????13 | ????1.8∶1 | Ferrous sulfate, iron chloride | ??NaOH | 30 milliliters of kerosene | C 18H 34O 2(C 6H 13O) 2POOH |
| ????14 | ????1.8∶0.8∶0.1∶0.1 | Frerrous chloride, iron chloride, zinc chloride, manganese nitrate | ??NH 4OH | 35 milliliters of No. 260 solvent naphthas | C 19H 36O 2(C 8H 17O) 2POOH |
| ????15 | ????1.8∶0.8∶0.1∶0.1 | Ferrous sulfate, iron chloride, zinc chloride, manganese nitrate | ??NaOH | Poly alpha olefin 40ml | ?C 18H 34O 2(C 10H 21O) 2POOH |
| ????16 | ????1.8∶0.8∶0.1∶0.1 | Frerrous chloride, iron chloride, zinc chloride, manganese nitrate | ??NaOH | Hexadecane 35ml | ?C 18H 36O 2(C 7H 15O) 2POOH |
| ????17 | ????1.8∶0.85∶0.15 | Ferrous sulfate, iron chloride, zinc chloride | ??NH 4OH | Atoleine 20ml | ?C 20H 40O 2(C 8H 17O) 2POOH |
| ????18 | ????1.8∶0.8∶0.2 | Ferrous sulfate, iron chloride, zinc chloride, manganese nitrate | ??NaOH | Eicosane naphthalene 40ml | ?C 18H 34O 2(C 9H 18O) 2POOH |
Annotate: Fe
3+: Fe
2+: M
2+Be used slaine atomic ratio, M is metal ions such as zinc, manganese, cobalt, can be one or more.
Table two, embodiment reaction condition
| Sequence number | Reaction temperature ℃ | Reaction density (adding precipitation reagent) | Reaction time minute | Pickling concentration (adding HCl) | The magnetic liquid performance | ||
| ??Ms | ??η | ?Vp | |||||
| ??1 | ????60 | ????PH＝12 | ????90 | ????PH＝4 | ??165 | ??150 | ??- |
| ??2 | ????85 | ????PH＝12 | ????15 | ????PH＝3 | ??149 | ??150 | ??- |
| ??3 | ????80 | ????PH＝11 | ????30 | ????PH＝2 | ??185 | ??200 | |
| ??4 | ????80 | ????PH＝12 | ????30 | ????PH＝2 | ??170 | ??200 | |
| ??5 | ????75 | ????PH＝11 | ????60 | ????PH＝2 | ??407 | ??7000 | ??1.0 |
| ??6 | ????85 | ????PH＝12 | ????35 | ????PH＝2 | ??434 | ??3550 | ??1.2 |
| ??7 | ????80 | ????PH＝12 | ????35 | ????PH＝3 | ??445 | ??3350 | ??1.4 |
| ??8 | ????85 | ????PH＝10 | ????25 | ????PH＝3 | ??460 | ??6870 | ??1.3 |
| ??9 | ????90 | ????PH＝12 | ????20 | ????PH＝4 | ??335 | ??3148 | ??3.0 |
| ??10 | ????80 | ????PH＝12 | ????30 | ????PH＝3 | ??380 | ??4660 | ??- |
| ??11 | ????80 | ????PH＝12 | ????30 | ????PH＝2 | ??330 | ??3750 | ??- |
| ??12 | ????80 | ????PH＝12 | ????40 | ????PH＝3 | ??300 | ??3200 | ??- |
| ??13 | ????85 | ????PH＝11 | ????25 | ????PH＝2 | ??250 | ??403 | ??- |
| ??14 | ????75 | ????PH＝12 | ????75 | ????PH＝4 | ??300 | ??320 | |
| ??15 | ????70 | ????PH＝11 | ????50 | ????PH＝3 | ??350 | ??304 | |
| ??16 | ????85 | ????PH＝12 | ????25 | ????PH＝3 | ??250 | ??450 | |
| ??17 | ????85 | ????PH＝12 | ????20 | ????PH＝3 | ??250 | ??280 | |
| ??18 | ????80 | ????PH＝12 | ????25 | ????PH＝2 | ??250 | ??250 | |
Ms: saturation magnetization, Gauss
η: viscosity in the time of 25 ℃, centipoise
Vp:25 ℃ of saturated vapor pressure, 10
-6Pa
Because the reason that crystal generates and grows up, the optimum condition of reaction is that reaction temperature is 80～90 ℃, 15～25 minutes reaction time.For its best complex type surfactant of dibasic acid esters base is (RO)
2POOH (R is C8～C10 alkyl molecule) and [RO (C
2H
4O)
nPO (OH)
3-m] (R is C
8～C
10Positive alkyl molecule, n gets 6～8, m is 1 or 2), prepared magnetic liquid stability is best.
Claims (5)
1, a kind of ferrite nano magnetic liquid is characterized in that:
A, this magnetic liquid by the ferrite nano particulate, be coated on the suitable compound surfactant of ferrite nano microparticle surfaces and suitable base fluid is formed;
B, this magnetic liquid are made by following method: it is even at first to prepare particle size distribution; Ferrite nano particulate about average grain diameter 10nm, coat suitable compound surfactant at microparticle surfaces then, to coat good particulate after distilled water, acetone clean repeatedly, join in the selected base fluid through processing such as fully stirring, dispersion, heating, form stable magnetic liquid, in gravitational field, magnetic field, electric field, can steady in a long-termly exist; Do not precipitate, not stratified.The viscosity 50-10000 centipoise of magnetic liquid, saturation magnetization 100～500 Gausses can regulate arbitrarily.
2, a kind of ferrite nano magnetic liquid as claimed in claim 1 is characterized in that: described ferrite nano particulate adopts the chemical coprecipitation preparation, and particle size distribution is even; About average grain diameter 10nm.With frerrous chloride (or ferrous sulfate), ferric trichloride is a raw material, also can add soluble zinc salt, manganese salt, cobalt salt etc., and ammoniacal liquor or NaOH are precipitation reagent, reaction temperature 60-95 ℃, and 1～60 minute reaction time.
3, a kind of ferrite nano magnetic liquid as claimed in claim 1 is characterized in that: described compound surfactant, water base is C
nH
2nO
2Or C
nH
2n-2O
2(n 〉=18) and linear alkyl benzene sulphonate, alkyl are C
nH
2nO
2Or C
nH
2n-2O
2(n 〉=18) and (RO)
2POOH (R is C6～C10 alkyl molecule), the dibasic acid esters base is (RO)
2POOH (R is C6～C10 alkyl molecule) and [RO (C
2H
4O)
nPO (OH)
3-m] (R is C
4～C
14Positive alkyl molecule, n gets 2～12, m is 1 or 2), the mass ratio of surfactant and magnetic particle is 1: 10～1: 2, and the reaction temperature of coating reaction is 60～90 ℃, and in 5～120 minutes reaction time, pH value is between 10～12.
4, a kind of ferrite nano magnetic liquid as claimed in claim 1 is characterized in that: selected base fluid can be distilled water, has varsol of long-chain (can be mixture) or di esters reagent C
6H
4(COOR)
2(R is C
7～C
10Alkyl molecule), also can insert CH between phenyl ring and the carboxyl
2, CH
2CH
2, dibasic acid esters can be the ortho position, also can be between the position.
5, a kind of ferrite nano magnetic liquid as claimed in claim 1 is characterized in that: described best complex type surfactant, the dibasic acid esters base is (RO)
2POOH (R is C8～C10 alkyl molecule) and [RO (C
2H
4O)
nPO (OH)
3-m] (R is C
8～C
10Positive alkyl molecule, n gets 6～8, m is 1 or 2), the optimal reaction temperature of reaction is 80～90 ℃, in 15～25 minutes reaction time, pH value is between 10～12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02112663 CN1365124A (en) | 2002-02-09 | 2002-02-09 | Ferrite nano magnetic liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02112663 CN1365124A (en) | 2002-02-09 | 2002-02-09 | Ferrite nano magnetic liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1365124A true CN1365124A (en) | 2002-08-21 |
Family
ID=4742170
Family Applications (1)
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|---|---|---|---|
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|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101023022B (en) * | 2004-09-17 | 2010-05-26 | 独立行政法人产业技术综合研究所 | Nanocapsule-type structure |
| CN1797624B (en) * | 2004-12-29 | 2010-12-08 | 巨东英 | Ferrimagnetism fluid |
| CN103426586A (en) * | 2013-07-31 | 2013-12-04 | 上海理工大学 | Method for preparing zinc ferrite water-based nanometer magnetic fluid |
| CN104141796A (en) * | 2014-07-04 | 2014-11-12 | 北京交通大学 | Method for increasing sealing and pressure resisting capacity of magnetic liquid by using magnetoconductivity nanowire magnetic liquid |
-
2002
- 2002-02-09 CN CN 02112663 patent/CN1365124A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101023022B (en) * | 2004-09-17 | 2010-05-26 | 独立行政法人产业技术综合研究所 | Nanocapsule-type structure |
| CN1797624B (en) * | 2004-12-29 | 2010-12-08 | 巨东英 | Ferrimagnetism fluid |
| CN103426586A (en) * | 2013-07-31 | 2013-12-04 | 上海理工大学 | Method for preparing zinc ferrite water-based nanometer magnetic fluid |
| CN104141796A (en) * | 2014-07-04 | 2014-11-12 | 北京交通大学 | Method for increasing sealing and pressure resisting capacity of magnetic liquid by using magnetoconductivity nanowire magnetic liquid |
| CN104141796B (en) * | 2014-07-04 | 2016-02-10 | 北京交通大学 | The method of magnetic fluid sealing voltage endurance capability is improved with magnetic conductivity nanowire magnetic liquid |
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