CN109850902A - A kind of preparation method of silico-tungstic acid nanometer rods - Google Patents
A kind of preparation method of silico-tungstic acid nanometer rods Download PDFInfo
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- CN109850902A CN109850902A CN201811526340.2A CN201811526340A CN109850902A CN 109850902 A CN109850902 A CN 109850902A CN 201811526340 A CN201811526340 A CN 201811526340A CN 109850902 A CN109850902 A CN 109850902A
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Abstract
The present invention provides a kind of preparation methods of silico-tungstic acid nanometer rods, belong to technical field of nano material.The present invention uses simple heat treatment method, forms nanometer rods using block copolymer induction silico-tungstic acid.Method proposed by the invention is significantly different from conventional solution method or hydro-thermal method, and characteristic is that silico-tungstic acid nanometer rods can be prepared from macromolecule ontology.The polyacid nanorod diameter obtained by this method is uniform, draw ratio is high (> 80:1), size is controllable.It is this method safety and environmental protection, low in cost, it can be prepared with mass.
Description
Technical field
The present invention relates to technical field of nano material, specially a kind of preparation method of silico-tungstic acid nanometer rods.
Background technique
Polyoxometallate (polyoxometalates, POMs), abbreviation polyacid are the metals formed by early transition metal
Oxide polyhedron passes through corner-sharing, the metal ion molecular cluster that the combinations such as side, coplanar are formed altogether.Polyacid is in catalysis, absorption
With separate, the huge applications potentiality on photoelectric material, biomaterial and spintronics and quantum calculation so that its research is standby
It is concerned.
Polyacid pass through nearly development in 200 years, have structure type abundant, except typical Keggin-type, Dawson type,
Except Lindqvist type, Anderson type etc., polyacid can also be assembled into various huge molecular clusters.From last century the nineties
Achim M ü professor ller of German Billy's Field university (University of Bielefeld) synthesizes huge polyacid for the first time
Since molecule, nearly hundred kinds of nanometer polyacid molecular clusters with different-shape and size have been synthesized.Polyacid usually has
Unique physicochemical properties, for example, the similarity of mixed oxide, independent ionic structure, relatively high average molecular matter
Amount, polyelectron oxidation-reduction quality, can photooxidation/reproducibility etc., this makes it have highly important application in various fields
Value.
Currently, the self assembly of polyacid carries out in solution system mostly.Different pH, organic ligand, counter ion and also
The amount of former agent can all directly affect the self assembly behavior of polyacid.And with the development of nano material, polyacidic scholars will be typical
The method of the synthesizing one-dimensionals nano material such as template auxiliary law, gas-liquid-solid auxiliary law, electrochemical method be applied to polyacid nanometer
In the preparation of material, but reaction is difficult to control involved in these methods, higher cost, synthesis cycle are long, is limited in fact
Border application.Therefore, develop a kind of simple and easy mode prepare the polyacid nanometer rods that shape is regular, length is controllable have it is important
Practical significance and application value.
Summary of the invention
Simple method is used the present invention provides a kind of, is formed and is received in the body using block copolymer induction silico-tungstic acid
Rice stick.
The present invention provides a kind of preparation methods of silico-tungstic acid nanometer rods, and described method includes following steps:
(1) preparation of polymer, silico-tungstic acid mixed system: being configured to mixed solution for PEO block copolymer and silico-tungstic acid, volatilization
Copolymer and silico-tungstic acid mixture are obtained after solvent；
(2) silico-tungstic acid nanometer rods are prepared after being heat-treated mixture prepared by step (1).
Preferably, in step (1), in step (1), the PEO block copolymer is the block copolymer containing PEO, with
The segment of PEO direct or indirect connection is polyacrylate macromolecule or polyester-based polymer.
The PEO block copolymer is (AB)nType block copolymer or (ABA)nType block copolymer, wherein A sections are poly- third
Olefin(e) acid esters macromolecule or polyester-based polymer, B sections are PEO, and n is non-zero natural number, such as 1,2,3 ....
Preferably, the polyacrylate macromolecule is polymethyl methacrylate or polyethyl methacrylate, is gathered
Esters macromolecule is Poly L-lactide.
Preferably, the PEO block copolymer is PEO-PMMA, PMMA-PEO-PMMA, PEMA-PEO-PEMA or PLLA-
PEO-PLLA。
Silico-tungstic acid molecular formula is H4[SiW12O40]；
Preferably, the mass ratio of the copolymer and silico-tungstic acid is 3:1 ~ 15:1.
Preferably, the heating temperature is 100 DEG C~180 DEG C.
Preferably, the heat treatment time is specially 1min ~ 120min.
Preferably, organic solvent described in step (1) is tetrahydrofuran, dioxane, chloroform, methylene chloride or acetone.
The present invention utilizes block copolymer induction silico-tungstic acid to form nano bar-shape structure in the body using heat treatment mode,
The nanometer rods of acquisition are amorphous state.
Compared with prior art, the invention has the following beneficial effects:
1. this method uses simple heat treatment method, nanometer rods are formed using block copolymer induction silico-tungstic acid, directly in height
Silico-tungstic acid nanometer rods are prepared in biomolecule ontology, method proposed by the invention is significantly different from conventional solution method or hydro-thermal method, keeps away
Exempt from using tank solution, be not necessarily to special installation, safety and environmental protection, simple and easy to do, the method used through the invention, can quickly,
Mass prepares silico-tungstic acid nanometer rods；
2. prepared silico-tungstic acid nanorod structure is advised through the invention compared with traditional silico-tungstic acid nanometer rods preparation method
It is whole, there is uniform diameter and high length-diameter ratio (> 80:1).
3. the present invention can regulate and control the length of polyacid nanometer rods by changing heating temperature or heating time.
Detailed description of the invention
Fig. 1 a and 1b be respectively in the embodiment of the present invention 1 transmission electron microscope photo of silico-tungstic acid nanometer rods and electronics spread out
Penetrate figure；
Fig. 2 is the infrared spectrogram of polyethylene glycol homopolymer, silico-tungstic acid and the two mixture；
Transmission electron microscope of Fig. 3 a-3c by forming silico-tungstic acid nanometer rods at a temperature of different heating in the embodiment of the present invention 2
Photo；
Transmission electron microscope of Fig. 4 a-4d by forming silico-tungstic acid nanometer rods under the different heating time in the embodiment of the present invention 3
Photo；
Fig. 5 a and 5b be in the embodiment of the present invention 4, block copolymer, silico-tungstic acid mixed proportion difference when obtained nanometer rods
Transmission electron microscope photo；
Fig. 6 a-6c is the transmission electron microscope of different block copolymers and silico-tungstic acid formation nanometer rods in the embodiment of the present invention 5
Photo；
Fig. 7 is the transmission electron microscopy for the nanometer rods that silico-tungstic acid is formed in AB type di-block copolymer in the embodiment of the present invention 6
Mirror photo；
Fig. 8 is in comparative example 1 of the present invention, and silico-tungstic acid forms the transmission electron microscope photo of nanostructure in PEO homopolymer；
Fig. 9 a and 9b are respectively in comparative example 2 of the present invention, and silico-tungstic acid forms nano junction in PMMA homopolymer and PEMA homopolymer
The transmission electron microscope photo of structure；
Figure 10 is in comparative example 3 of the present invention, and silico-tungstic acid forms the transmission electron microscopy of nanostructure in PEO/PMMA blend
Mirror photo.
Specific embodiment
The present invention is described in detail With reference to embodiment.Following embodiment will be helpful to art technology
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.This belongs to of the invention
Protection scope.
Block copolymer is synthesized according to existing document report in the present invention, remaining reagent is all direct purchase, without special place
Reason.In addition to having other to illustrate, PEO molecular weight is 10000g/mol in embodiment.
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
1 g PMMA-PEO-PMMA block copolymer is taken, 50 ml tetrahydrofuran solutions are added；0.1 g silico-tungstic acid is taken, is added 50
Ml tetrahydrofuran solution；After the two is mixed, solvent is removed to get the mixture of copolymer and silico-tungstic acid by volatilization.Copolymerization
The mixture of object and silico-tungstic acid is cooled to room temperature after 120oC heats 15min.
The transmission electron microscope photo of prepared silico-tungstic acid nanometer rods and electron diffraction diagram are shown in Fig. 1 a in the embodiment
And 1b.Electron microscope the result shows that silico-tungstic acid forms nanometer rods of uniform size.It is not observed in electronic diffraction experiment
Illustrate that nanometer rods are non crystalline structure such as point diffraction or diffraction ring to any diffraction pattern.
The mixture of PEO homopolymer, silico-tungstic acid and the two mass ratio 10:1 is subjected to infrared analysis, infrared spectroscopy respectively
Figure is as shown in Figure 2.The result shows that there are hydrogen bond actions between silico-tungstic acid and PEO.
Embodiment 2
1 g PMMA-PEO-PMMA block copolymer is taken, 50 ml tetrahydrofuran solutions are added；0.1 g silico-tungstic acid is taken, is added 50
Ml tetrahydrofuran solution；The two is mixed, solvent is removed by volatilization, obtains the mixture of copolymer and silico-tungstic acid.
Mixture is heated into 15 min in 100 oC, corresponding transmission electron microscope photo is as shown in Figure 3a.Same batten
Under part, temperature is replaced with into 140 DEG C and 180 DEG C, the transmission electron microscope photo of obtained silico-tungstic acid nanometer rods such as Fig. 3 b
With shown in 3c.The result shows that silico-tungstic acid nanometer rods of uniform size can be obtained within the scope of very wide temperature.At 180 oC
The draw ratio of obtained silico-tungstic acid nanometer rods is up to greater than 80:1.
Embodiment 3
1 g PMMA-PEO-PMMA block copolymer is taken, 50 ml tetrahydrofuran solutions are added；0.1g silico-tungstic acid is taken, is added 50
Ml tetrahydrofuran solution；The two is mixed, solvent is removed by volatilization, obtains the mixture of copolymer and silico-tungstic acid.
Mixture is heated into 1min in 120oC, corresponding transmission electron microscope photo is as shown in fig. 4 a.Similarity condition
Under, 15min, 60min and 120min will be replaced with heating time, the transmission electron microscope of obtained silico-tungstic acid nanometer rods shines
Piece is as shown in Fig. 4 b, 4c and 4d.The result shows that the silico-tungstic acid nanometer rods have uniform size, in certain time range
Interior, nanorod length is dramatically increased with the extension of heating time.After reaching certain value between when heated, in mixture
Silico-tungstic acid can all enter nanometer rods substantially.Even if continuing to extend heating time at this time, due to lacking enough raw materials, nanometer rods
Size can't be continued for increasing.
Embodiment 4
1 g PMMA-PEO-PMMA block copolymer is taken, 50 ml tetrahydrofuran solutions are added；0.33g silico-tungstic acid is taken, is added 50
Ml tetrahydrofuran solution；The two is mixed, solvent is removed by volatilization, obtains the mixture of copolymer and silico-tungstic acid, mass ratio
For 3:1.The mixture of copolymer and silico-tungstic acid is cooled to room temperature after 120oC heats 15 min.Obtained silico-tungstic acid nanometer
The transmission electron microscope photo of stick is as shown in Figure 5 a.Under similarity condition, the amount of silico-tungstic acid is replaced with into 0.067g, i.e., by quality
Than replacing with 15:1, the transmission electron microscope photo of obtained silico-tungstic acid nanometer rods is as shown in Figure 5 b.
The result shows that the available nanometer rods under different feed ratios.When silico-tungstic acid ratio is higher, nucleation density compared with
Height, so observing that the density of nanometer rods is also higher；And when silico-tungstic acid ratio is lower, nucleation density is lower, so obtain
The density of nanometer rods is relatively low.
Embodiment 5
1g PEMA-PEO-PEMA block copolymer is taken, 50 ml tetrahydrofuran solutions are added；0.1 g silico-tungstic acid is taken, is added 50
Ml tetrahydrofuran solution；The two is mixed, solvent is removed by volatilization, obtains the mixing of different block copolymers and silico-tungstic acid
Object.Mixture is handled into 15 min, the transmission electron microscope photo of obtained silico-tungstic acid nanometer rods such as Fig. 6 b at 120 DEG C
It is shown.Under similarity condition, block copolymer PEMA-PEO-PEMA is replaced with into PLLA-PEO-PLLA, obtained silico-tungstic acid is received
The transmission electron microscope photo of rice stick is as fig. 6 c.As a comparison, Fig. 6 a is that silico-tungstic acid obtains in PMMA-PEO-PMMA
Nanometer rods transmission electron microscope photo.
The result shows that the chemical structure of the second segment except PEO will not influence the formation of silico-tungstic acid nanometer rods.Therefore,
The method proposed through the invention, different types of PEO block copolymer may be used to prepare silico-tungstic acid nanometer rods.
Embodiment 6
1 g PEO-PMMA di-block copolymer (belonging to AB block copolymer) is taken, wherein PEO segment molecule amount is 2000 g/
50 ml tetrahydrofuran solutions are added in mol；0.1g silico-tungstic acid is taken, 50 ml tetrahydrofuran solutions are added；The two is mixed, is passed through
Volatilization removes solvent, obtains the mixture of copolymer and silico-tungstic acid.After 120 oC heat 15 min, it is cooled to room temperature.
The silico-tungstic acid nanometer rods that above-mentioned preparation method obtains are as shown in Figure 7.It is in comparative example 1 as a result, illustrating difference
The PEO block copolymer of chain topological structure can induce silico-tungstic acid to form nanometer rods.
Comparative example 1
The preparation method of this comparative example and embodiment 3 is essentially identical, and difference is that the copolymer being added replaces with PEO homopolymer.
As a result it as shown in figure 8, transmission electron microscope observing is the result shows that is formed under this condition is the random nanoscale twins of silico-tungstic acid, can not be formed
Uniform nanometer rods.
Comparative example 2
The preparation method of this comparative example and embodiment 3 is essentially identical, and difference is that the copolymer being added replaces with PMMA or PEMA
Homopolymer.Fig. 9 a is the homopolymer that polymer is PMMA, and Fig. 9 b is the homopolymer that polymer is PEMA, transmission electron microscope observing knot
Fruit shows that silico-tungstic acid nanometer rods can not be formed under this condition.
Comparative example 3
The preparation method of this comparative example and embodiment 3 is essentially identical, and difference is only that copolymer be added replaces with PEO homopolymerization
The mixture of object and PMMA homopolymer.The results are shown in Figure 10, and transmission electron microscope observing the result shows that can not form silicon under this condition
Wolframic acid nanometer rods.
Although above-described embodiment is not used it is understood that the invention patent is disclosed as above with preferred embodiments
In limitation the invention patent.For any person skilled in the art, the invention patent aspects are not being departed from
In the case of, the summary of the invention that may be by the disclosure above makes many possible changes and modifications to the invention patent, or repairs
It is changed to the equivalent embodiment of equivalent variations.Therefore, all contents without departing from the invention patent scheme, according to the present invention patent skill
Any simple modifications, equivalents, and modifications that art substantially does above-described embodiment belong to the model of the invention patent protection
It encloses.
Claims (10)
1. a kind of simple preparation method of silico-tungstic acid nanometer rods, which is characterized in that described method includes following steps:
(1) PEO block copolymer and silico-tungstic acid mixing are dissolved in organic solvent and are configured to solution, be copolymerized after evaporation of solvent
Object and silico-tungstic acid mixture；
(2) mixture for obtaining step (1) obtains the silico-tungstic acid nanometer rods after being heat-treated.
2. preparation method according to claim 1, which is characterized in that in step (1), the PEO block copolymer be containing
There is the block copolymer of PEO, the segment with PEO direct or indirect connection is polyacrylate macromolecule or polyesters high score
Son.
3. preparation method according to claim 2, which is characterized in that the PEO block copolymer is (AB)nType block is total
Polymers or (ABA)nType block copolymer, wherein A sections are polyacrylate macromolecule or polyester-based polymer, and B sections are PEO, n
For non-zero natural number.
4. preparation method according to claim 2 or 3, which is characterized in that the polyacrylate macromolecule is poly- first
Base methyl acrylate or polyethyl methacrylate, polyester-based polymer are Poly L-lactide.
5. the preparation method according to claim 4, which is characterized in that the PEO block copolymer be PEO-PMMA,
PMMA-PEO-PMMA, PEMA-PEO-PEMA or PLLA-PEO-PLLA.
6. preparation method according to claim 1, it is characterised in that: in step (1), the PEO block copolymer and silicon
Wolframic acid mass ratio is 3:1~15:1.
7. preparation method according to claim 1, which is characterized in that in step (2), heat treatment temperature is 100-180 DEG C.
8. preparation method according to claim 1, which is characterized in that in step (2), heat treatment time 1-120min.
9. preparation method according to claim 1, which is characterized in that organic solvent described in step (1) be tetrahydrofuran,
Dioxane, chloroform, methylene chloride or acetone.
10. the silico-tungstic acid nanometer rods that any one of claim 1-9 preparation method obtains, which is characterized in that the nanometer rods are
Amorphous state.
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| WO2020258605A1 (en) * | 2019-06-27 | 2020-12-30 | 华南理工大学 | Polyacid-based electrolyte conductor material and preparation method and application thereof |
| CN112391133A (en) * | 2020-11-04 | 2021-02-23 | 吉林大学 | Heteropolyacid-reinforced polyacrylate adhesive and preparation method thereof |
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Cited By (3)
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| CN112391133B (en) * | 2020-11-04 | 2021-12-28 | 吉林大学 | Heteropolyacid-reinforced polyacrylate adhesive and preparation method thereof |
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