CN111204816A - Composite material of ferric oxide coated by silicon dioxide and preparation method thereof - Google Patents
Composite material of ferric oxide coated by silicon dioxide and preparation method thereof Download PDFInfo
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- CN111204816A CN111204816A CN202010031476.7A CN202010031476A CN111204816A CN 111204816 A CN111204816 A CN 111204816A CN 202010031476 A CN202010031476 A CN 202010031476A CN 111204816 A CN111204816 A CN 111204816A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 235000012239 silicon dioxide Nutrition 0.000 title claims abstract description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims abstract description 12
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 title claims abstract description 12
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 13
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 13
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 13
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001509 sodium citrate Substances 0.000 claims abstract description 11
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 11
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 8
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000007832 Na2SO4 Substances 0.000 claims description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 4
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 claims 8
- 238000000034 method Methods 0.000 claims 8
- 230000001476 alcoholic effect Effects 0.000 claims 1
- 230000000284 resting effect Effects 0.000 claims 1
- 239000002904 solvent Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 239000002086 nanomaterial Substances 0.000 abstract description 5
- 239000003054 catalyst Substances 0.000 abstract description 4
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 239000003814 drug Substances 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 abstract description 2
- 239000006249 magnetic particle Substances 0.000 abstract description 2
- 239000002105 nanoparticle Substances 0.000 abstract description 2
- 238000011160 research Methods 0.000 abstract description 2
- 229940079593 drug Drugs 0.000 abstract 1
- 238000012377 drug delivery Methods 0.000 abstract 1
- 238000001476 gene delivery Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 20
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 241001274216 Naso Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000006117 anti-reflective coating Substances 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000003937 drug carrier Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002073 nanorod Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 235000011083 sodium citrates Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
- C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
- C01P2004/84—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases one phase coated with the other
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses a silicon dioxide coated ferric oxide composite material and a preparation method thereof. Which comprises the following steps: mixing Fe2O3Adding colloidal particles, ethanol, water, a sodium citrate solution, ammonia water and tetraethyl orthosilicate into a polyvinyl pyrrolidone amyl alcohol solution, standing at the temperature of 30-60 ℃, washing and drying. According to the invention, a series of composite materials with various morphologies can be prepared simply, effectively and stably by changing the addition amount of the reagent and the reaction conditions, so that an idea is provided for the morphology design and research of hybrid particles, and a possibility is provided for exploring new nano particles and nano structures; not only decorate Fe2O3The inherent disadvantages of magnetic particles, and the introduction of low cost and widely applicable silica rod structure, make the composite structure in photon/plasma devices, nano-electronics, high efficiency conversion/energy storage, micro-diagnostic systems, drug/gene delivery and differentiationThe catalyst has certain potential application value in the fields of hierarchical structure catalysts and the like.
Description
Technical Field
The invention particularly relates to a silicon dioxide coated ferric oxide composite material and a preparation method thereof.
Background
SiO2The material has stable chemical properties, and has wide application in the fields of electronics, optics, fireproof materials and the like. In recent years, a new class of micron-sized silica rods has received a great deal of attention. These colloidal rods can provide completely different properties and applications in different size domains compared to nanorods. For example, silica rods, which have good anti-reflective properties when in the half micron size range, have been tried for application in the fabrication of anti-reflective coatings. The chemical inertness of the silica rod is utilized, and the silica rod can be applied to catalyst carriers and drug carriers through simple surface modification. In addition, the composite material has great application potential in the optical field and composite materials. Because the colloid rods are made of low-cost and earth-abundant materials, the colloid rods have better potential application value and benefit in practice.
With Fe2O3The typical magnetic nano material has special properties such as good magnetic guidance, superparamagnetic enzyme catalysis property, biocompatibility and the like, and has the special properties of the nano material, so the magnetic nano material is widely applied to aspects of bioseparation, water body detection, improvement of the performance of a high polymer solar cell and the like. But has the defects of easy agglomeration, acid intolerance and the like, so the application is limited.
In the prior art, although SiO already exists2Coated magnetic Fe2O3The composite materials (such as Chinese patent documents CN103406078A and CN101186762A) are all simple coatings and only have one morphology, and how to control each parameter or condition to realize specific SiO with controllable morphology is not disclosed2Coated with Fe2O3The composite material of (1).
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect that a simple preparation method of a multi-morphology composite structure is lacked in the prior art, and provides a silicon dioxide coated ferric oxide composite material and a preparation method thereof.
The invention solves the technical problems through the following technical scheme.
The invention discloses a preparation method of a silicon dioxide coated ferric oxide composite material, which comprises the following steps:
mixing Fe2O3Adding colloidal particles, ethanol, water, a sodium citrate solution, ammonia water and tetraethyl orthosilicate into a polyvinyl pyrrolidone amyl alcohol solution, standing at the temperature of 30-60 ℃, washing and drying.
In the present invention, the Fe2O3The preparation method of the colloidal particles may be conventional in the art, and is preferably performed by the following steps: in FeCl3Adding NaOH solution and NaSO into the solution while continuously stirring4Obtaining a gel, and placing the gel in an oven to form colloidal particles. Those skilled in the art can adjust NaSO4In an amount to obtain ellipsoidal or tetragonal Fe2O3Colloidal particles.
Wherein the FeCl3The concentration of the solution may be conventional in the art, and is preferably 1-3M, such as 2M. The concentration of the NaOH solution can be conventional in the art, and is preferably 4-8M, such as 6M. The Na is2SO4The concentration of the solution may be conventional in the art, and is preferably 0-0.06M. Preferably, said NaOH solution or said NaSO4The solution is dripped into FeCl at a constant speed3In solution.
Wherein the FeCl3NaOH and Na2SO4The molar ratio of (A) to (B) can be conventional in the art, preferably (50-60) to (15-25) to (0-0.08), for example 20:54: 0.06.
The number of days of placing in the oven can be conventional in the art, and is generally 10-14 days, such as 12 days. The temperature of the oven may be conventional in the art, typically 100 ℃. Preferably, the colloidal particles formed in the oven are repeatedly washed with water and dried for use. The water is typically deionized water.
In the present invention, the Fe2O3The mass-to-volume ratio of the colloidal particles to the ethanol is preferably (5-10) mg:1mL, more preferably (7-8) mg:1mL, for example 7.5mg:1 mL.
In the present invention, the Fe2O3The mass to volume ratio of colloidal particles to said water is preferably 45mg (1-5) mL, for example 45mg (2-4) mL, for example 45mg:2.2mL, 45mg:2.4mL or 45mg:3.8 mL.
In the present invention, the Fe2O3The mass-volume ratio of the colloidal particles to the sodium citrate solution is preferably 225mg (1-30) mL, for example 225mg (2-15) mL.
In the present invention, the concentration of the sodium citrate solution is preferably 0.1-0.2M, such as 0.18M.
In the present invention, the Fe2O3The mass-volume ratio of the colloidal particles to the ammonia water is preferably (200 to 250) mg:6mL, for example 225mg:6 mL.
In the present invention, the Fe2O3The mass-to-volume ratio of the colloidal particles to the tetraethyl orthosilicate is preferably (70 to 80) mg:1mL, for example 75mg:1 mL.
In the invention, the volume mass ratio of amyl alcohol to polyvinylpyrrolidone in the polyvinylpyrrolidone-containing amyl alcohol solution is preferably (8-12): 1, and more preferably 10: 1.
In the present invention, the Fe2O3The mass-to-volume ratio of the colloidal particles to the polyvinylpyrrolidone amyl alcohol solution is preferably 1mg (1.2-1.6) mL, for example 1mg:1.47 mL.
In the present invention, the operation and conditions of the standing may be conventional in the art, and the standing is generally performed in a water bath.
In the invention, the standing time is preferably 6-12 h.
In the present invention, the washing operation and conditions may be conventional in the art, and washing with deionized water is generally performed. The number of washing is preferably 3.
The invention provides a silicon dioxide coated ferric oxide composite material prepared by the preparation method.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
according to the invention, a series of silicon dioxide coated ferric oxide composite materials with various shapes can be simply, effectively and stably prepared by changing the addition amount of the reagent and the reaction conditions, so that an idea is provided for the shape design research of hybrid particles, and a possibility is provided for exploring new nano particles and nano structures. Not only decorate Fe2O3The inherent defects of the magnetic particles and the introduction of the silicon dioxide rod structure with low cost and wide application range lead the composite structure to have certain potential application value in the fields of photon/plasma devices, nano-electrons, high-efficiency conversion/energy storage, micro-diagnosis systems, medicine/gene transfer, hierarchical structure catalysts and the like.
In the preparation process of the invention, water drops are adsorbed on hydrophilic Fe2O3The epitaxial growth of the silicon dioxide rod is realized on the surface (ammonia water, sodium citrate, polyvinylpyrrolidone and other substances are in water drops), and the length, the diameter and the shape of the silicon dioxide rod are changed by controlling the addition amount of a reagent and reaction conditions, so that the silicon dioxide coated ferric oxide composite material with various shapes is simply, effectively and stably prepared.
Drawings
FIG. 1 shows ellipsoidal Fe prepared in step (1) of example 12O3SEM pictures of the particles.
FIG. 2 shows cube-type Fe prepared in step (1) of example 42O3SEM pictures of the particles.
Fig. 3 is an SEM picture of the composite material filament-like composite structure of example 1.
Fig. 4 is an SEM picture of the composite matchstick composite structure of example 2.
Fig. 5 is an SEM picture of a thumb-like composite structure of the composite material of example 3.
FIG. 6 is an SEM picture of a hexapod-like composite structure of the composite material of example 4.
FIG. 7 is an SEM picture of a composite long foot hexapod-like composite structure of example 5.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
The preparation method of the composite material (wire-shaped composite structure) of the silicon dioxide coated ferric oxide comprises the following steps:
(1) 90mL of 6M NaOH solution was added dropwise at a constant rate to 100mL of 2M FeCl kept under good stirring3To the solution, the solution was added 10min later, 10mL of 0.06M Na was added2SO4The solution is stirred evenly and then is kept stand in an oven at 100 ℃ for 12 days, and finally the product is repeatedly centrifugally washed for 3 times by deionized water and is dried;
(2) preparing 330mL of amyl alcohol/polyvinylpyrrolidone solution with the ratio of 10: 1;
(3) 30mL of ethanol, 11mL of deionized water and 225mg of ellipsoidal α -Fe2O3Adding colloidal particles, 2mL of 0.18M sodium citrate aqueous solution, 6mL of ammonia water and 3mL of tetraethyl orthosilicate into the amyl alcohol/polyvinylpyrrolidone solution step by step;
(4) and (3) transferring the reactants in the step (A) to a water bath kettle at the temperature of 30 ℃, standing for 6 hours, washing for 3-5 times by using water, and drying.
Examples 2 to 6
In examples 2 to 6, the operations and parameters were the same as in example 1 except that the conditions in Table 1 were different.
TABLE 1 detailed reaction conditions for the different examples
FIG. 1 shows ellipsoidal Fe prepared in step (1) of example 12O3SEM pictures of the particles. As can be seen from FIG. 1, the ellipsoid ranges from 0.9 to 1.0 μm in major axis and 0.7 to 0.8 μm in minor axis.
FIG. 2 shows cube-type Fe prepared in step (1) of example 42O3SEM pictures of the particles. As can be seen from FIG. 2, the cube side length ranged from 0.8 μm to 1.1. mu.m.
FIG. 3 is a SEM photograph of the composite material of example 1, wherein the composite material has a filament-like composite structure with a length of 7.5-9.5 μm and a diameter of 0.2-0.4. mu.m.
FIG. 4 is an SEM photograph of a matchstick composite structure of the composite material of example 2, having a length of 4.9-5.5 μm and a diameter of 0.8-1.2 μm.
FIG. 5 is an SEM photograph of a thumb-like composite structure of the composite material of example 3, having a length of 2.2-2.7 μm and a diameter of 0.8-1.4. mu.m.
FIG. 6 is an SEM photograph of a hexapod-like composite structure of the composite material of example 4, wherein each foot has a length of 1.5-2.0 μm and a diameter of 0.4-0.5. mu.m.
FIG. 7 is an SEM photograph of hexapod-like composite structures of composite long legs of example 5, each leg having a length of 3.8-4.5 μm and a diameter of 0.4-0.7. mu.m.
Claims (10)
1. The preparation method of the composite material of ferric oxide coated by silicon dioxide is characterized by comprising the following steps: mixing Fe2O3Adding colloidal particles, ethanol, water, a sodium citrate solution, ammonia water and tetraethyl orthosilicate into a polyvinyl pyrrolidone amyl alcohol solution, standing at the temperature of 30-60 ℃, washing and drying.
2. The method of preparing a silica-coated iron sesquioxide composite as set forth in claim 1, wherein said Fe2O3The preparation method of the colloidal particles comprises the following steps: in FeCl3Adding into the solution while continuously stirringAfter NaOH solution, add NaSO4Obtaining a gel, and placing the gel in an oven to form colloidal particles.
3. The method of preparing a silica-coated iron sesquioxide composite as set forth in claim 2, wherein said FeCl3The concentration of the solution is 1-3M;
and/or the concentration of the NaOH solution is 4-8M;
and/or, the Na2SO4The concentration of the solution is 0-0.06M;
and/or, the NaOH solution or the NaSO4The solution is dripped into FeCl at a constant speed3In solution;
and/or, the FeCl3NaOH and Na2SO4The molar ratio of (15-25) to (50-60) to (0.04-0.08);
and/or the number of days of placing in the oven is 10-14 days;
and/or the temperature of the oven is 80-120 ℃.
4. The method of preparing a silica-coated iron sesquioxide composite as set forth in claim 3, wherein said FeCl3The concentration of the solution was 2M;
and/or the concentration of the NaOH solution is 6M;
and/or, the FeCl3NaOH and Na2SO4In a molar ratio of 20:54: 0.06.
5. The method of preparing a silica-coated iron sesquioxide composite as set forth in claim 1, wherein said Fe2O3The mass-to-volume ratio of the colloidal particles to the ethanol is (7-8) mg:1 mL;
and/or, said Fe2O3The mass volume ratio of the colloidal particles to the water is 45mg (1-5) mL;
and/or, said Fe2O3The mass-volume ratio of the colloidal particles to the sodium citrate solution is 225mg (1-30) mL；
And/or the concentration of the sodium citrate solution is 0.1-0.2M.
6. The method of preparing a silica-coated iron sesquioxide composite as set forth in claim 5, wherein said Fe2O3The mass-volume ratio of the colloidal particles to the ethanol is 7.5mg:1 mL;
and/or, said Fe2O3The mass volume ratio of the colloidal particles to the water is 45mg (2-4) mL;
and/or, said Fe2O3The mass-volume ratio of the colloidal particles to the sodium citrate solution is 225mg (2-15) mL;
and/or the concentration of the sodium citrate solution is 0.18M.
7. The method of preparing a silica-coated iron sesquioxide composite as set forth in claim 1, said Fe2O3The mass-volume ratio of the colloidal particles to the ammonia water is (200-250) mg:6 mL;
and/or, said Fe2O3The mass-to-volume ratio of the colloidal particles to the tetraethyl orthosilicate is (70-80) mg:1 mL;
and/or in the solution containing polyvinylpyrrolidone and amyl alcohol, the volume mass ratio of amyl alcohol to polyvinylpyrrolidone is (8-12): 1.
8. The method of preparing a silica-coated ferric oxide composite as claimed in claim 7, the Fe2O3The mass-volume ratio of the colloidal particles to the ammonia water is 225mg:6 mL;
and/or, said Fe2O3The mass-volume ratio of the colloidal particles to the tetraethyl orthosilicate is 75mg:1 mL;
and/or in the solution containing polyvinylpyrrolidone and amyl alcohol, the volume mass ratio of amyl alcohol to polyvinylpyrrolidone is 10: 1;
and/or, said Fe2O3Colloidal particles and the polyvinylpyrrolidoneThe mass-to-volume ratio of the alcoholic solution is 1mg (1.2-1.6) mL.
9. The method of preparing a silica-coated iron sesquioxide composite material according to claim 1, wherein said resting is performed in a water bath;
and/or the standing time is 6-12 h;
and/or the washed solvent is deionized water.
10. A silica-coated iron sesquioxide composite material prepared by the preparation method as set forth in any one of claims 1 to 9.
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| CN113912971A (en) * | 2021-09-29 | 2022-01-11 | 华东理工大学 | Silicon dioxide and iron oxide composite material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103406078A (en) * | 2013-08-12 | 2013-11-27 | 上海应用技术学院 | Preparation method of magnetic iron sesquioxide particle coated with silicon dioxide and provided with oval-shaped nuclear shell type structure |
| CN104755429A (en) * | 2013-01-25 | 2015-07-01 | 株式会社Lg化学 | Trimanganese tetraoxide and method for producing same |
| CN107794043A (en) * | 2017-12-14 | 2018-03-13 | 东北师范大学 | Rear-earth-doped upper conversion@silica nanometer compound bars and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104755429A (en) * | 2013-01-25 | 2015-07-01 | 株式会社Lg化学 | Trimanganese tetraoxide and method for producing same |
| CN103406078A (en) * | 2013-08-12 | 2013-11-27 | 上海应用技术学院 | Preparation method of magnetic iron sesquioxide particle coated with silicon dioxide and provided with oval-shaped nuclear shell type structure |
| CN107794043A (en) * | 2017-12-14 | 2018-03-13 | 东北师范大学 | Rear-earth-doped upper conversion@silica nanometer compound bars and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113912971A (en) * | 2021-09-29 | 2022-01-11 | 华东理工大学 | Silicon dioxide and iron oxide composite material and preparation method thereof |
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