CN108913121B - Preparation method of methylene blue-containing silicon dioxide/shellac composite particle with high fluorescence intensity - Google Patents
Preparation method of methylene blue-containing silicon dioxide/shellac composite particle with high fluorescence intensity Download PDFInfo
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- CN108913121B CN108913121B CN201811090791.6A CN201811090791A CN108913121B CN 108913121 B CN108913121 B CN 108913121B CN 201811090791 A CN201811090791 A CN 201811090791A CN 108913121 B CN108913121 B CN 108913121B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
- C09K2211/1037—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom with sulfur
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Abstract
The invention provides a preparation method of a silica/shellac composite particle containing methylene blue and having high fluorescence intensity, belonging to the technical field of chemical raw material preparation. Adding ammonia water, methylene blue and ethyl orthosilicate into a mixed solution containing water and ethanol, stirring for 4 hours, centrifuging, washing and drying at 70 ℃, dispersing the prepared silicon dioxide particles containing the methylene blue into a shellac solution of 5-20 grams per liter, dropwise adding n-heptane, stirring for 2 hours, centrifuging, washing and drying at room temperature to obtain the silicon dioxide/shellac composite particles containing the methylene blue with high fluorescence intensity. The method has simple process, low raw material price and easy industrial production, and the obtained particles have good biocompatibility and high fluorescence intensity.
Description
Technical Field
A preparation method of methylene blue-containing silicon dioxide/shellac composite particles with high fluorescence intensity belongs to the field of chemical raw material preparation methods.
Background
The dye molecule has higher application value in the aspects of fluorescent sensors, biological fluorescent markers, cell tracing, solid-state lasers and the like, and the realization of the performances is related to the aggregation state of the dye molecule. In a high-concentration solution or solid powder, dye molecules such as methylene blue molecules are easy to form an aggregation state, and the interaction between the aggregation state molecules can cause the occurrence of a fluorescence quenching effect, so that a fluorescence signal is weakened, and the fluorescence signal of the methylene blue is almost undetected. Only in relatively dilute aqueous solutions, e.g. with concentrations of methylene blue molecules below 10-6The fluorescence signal of methylene blue can be detected every liter, which causes the application of methylene blue molecules in the related field to be greatly limited.
In recent years, research reports of dye molecules on the aspect of aggregation luminescence are very many, researchers mainly regulate and control the aggregation state of molecules in modes of molecular rotation limitation, intra-molecular coplanar or J-aggregate formation and the like among high-concentration dye molecules or solid aggregation state molecules, inhibit a non-radiative energy conversion mechanism for weakening a fluorescence signal, greatly reduce the probability of fluorescence quenching of the aggregation state of the dye molecules, and improve the fluorescence luminescence efficiency of the dye molecules. However, the research carried out in this respect mainly focuses on limited kinds of molecules, such as rhodamine B dye molecules, silole-like small molecules and branched polymer-like derivatives thereof, which have excellent performance, but high price, complex preparation process and certain limitations in biocompatibility. The methylene blue is used as a dye molecule, has low price and low toxicity, has a light-emitting range in a near infrared region, and is beneficial to the wide application of the methylene blue in related fields. The methylene blue is adsorbed into the particles, the interaction between the methylene blue molecules can be limited through the interaction between the methylene blue and the matrix, for example, the fluorescence intensity of the methylene blue is obviously improved after the methylene blue is adsorbed to the carrier by montmorillonite (Journal of Colloid and Interface Science 339(2009) 416-426), and the fluorescence signal of the methylene blue is also obviously improved in hydroxyapatite/silica composite particles containing the methylene blue (Applied Physics A113 (2013) 583-589). However, no report has been reported on a method for preparing a methylene blue-containing silica/shellac composite particle that realizes high fluorescence intensity by shellac-coating a methylene blue-containing silica particle.
Disclosure of Invention
The invention aims to provide a preparation method of a silica/shellac composite particle containing methylene blue with high fluorescence intensity, which is characterized by comprising the following steps:
(1) sequentially adding ammonia water and methylene blue into a mixed solution containing water and ethanol, stirring for 15 minutes, adding ethyl orthosilicate, wherein the volume ratio of water to ethanol to ammonia water to ethyl orthosilicate is 5:26.74:0.72:1, the concentration of methylene blue is 2.32 millimole per liter, stirring for 4 hours, performing centrifugal separation to obtain a sediment, washing the sediment twice with ethanol, and then washing once with an acetate buffer solution with the pH =3.6, wherein the volume ratio of ethanol to the acetate buffer solution to the ethyl orthosilicate is 34.88:1 and 5.81:1 respectively, and drying the sediment obtained through centrifugal separation at 70 ℃ for 24 hours to obtain silicon dioxide particles containing the methylene blue;
(2) dissolving shellac in ethanol to prepare shellac solution, wherein the concentration of shellac is 5-20 g/L, putting the silica particles containing methylene blue prepared in step (1) into shellac solution to make the concentration of the silica particles containing methylene blue 10 g/L, performing ultrasonic treatment for 5 minutes, n-heptane was added at a rate of 0.5 ml/min to the shellac solution containing silica particles containing methylene blue, wherein the volume ratio of n-heptane to shellac solution containing silica particles containing methylene blue is 3:1, stirring for 2 hr, centrifuging to obtain precipitate, washing the precipitate with deionized water, drying at room temperature for 12 hr, wherein the volume ratio of the deionized water to the shellac solution containing silica particles containing methylene blue is 2:1, thus obtaining the silica/shellac composite particle containing methylene blue with high fluorescence intensity.
The invention has the beneficial effects that:
(1) the selected reagent has low price, simple process method and device and easy industrialized production;
(2) the fluorescence intensity of the silica particles containing methylene blue can be regulated and controlled by changing the technological parameters of shellac coating;
(3) the methylene blue has low toxicity, the shellac and the silicon dioxide are nontoxic substances, the biocompatibility is good, and the prepared silicon dioxide/shellac composite particle containing the methylene blue has high fluorescence intensity and can be used in the fields of fluorescent display, solid-state laser, fluorescent sensor and the like.
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FIG. 1 is a fluorescence spectrum of a particle sample (wavelength of excitation light source: 532 nm, energy: 10 microwatts). (a) The particle sample is the silica/shellac composite particle containing methylene blue and having high fluorescence intensity prepared in example 1; (b) the particle sample is the silica/shellac composite particle containing methylene blue and having high fluorescence intensity prepared in example 2; (c) the particle sample is the silica/shellac composite particle containing methylene blue and having high fluorescence intensity prepared in example 3; (d) the particle sample was the silica particles containing methylene blue prepared by step 1 of example 1;
the specific implementation mode is as follows:
the present invention is further illustrated by the following examples.
Example 1
(1) Sequentially adding 92 ml of absolute ethyl alcohol, 17.2 ml of water, 2.48 ml of concentrated ammonia water and 0.10 g of methylene blue into a beaker, stirring for 15 minutes, adding 3.44 ml of ethyl orthosilicate, stirring for 4 hours, performing centrifugal separation to obtain a precipitate, washing the precipitate twice with 120 ml of ethanol, washing once with 20 ml of acetate buffer solution with pH =3.6, and drying the precipitate obtained through centrifugal separation at 70 ℃ for 24 hours to obtain silicon dioxide particles containing the methylene blue;
(2) dissolving shellac in ethanol to prepare a shellac solution, wherein the concentration of shellac is 5 g/l, putting the silica particles containing methylene blue prepared in step (1) into 10 ml of shellac solution to make the concentration of the silica particles containing methylene blue 10 g/l, performing ultrasonic treatment for 5 minutes, adding 30 ml of n-heptane into the shellac solution containing the silica particles containing methylene blue at a speed of 0.5 ml/min, stirring for 2 hours, performing centrifugal separation to obtain a precipitate, washing the precipitate with 20 ml of deionized water, and drying at room temperature for 12 hours to prepare the silica/shellac composite particles containing methylene blue with high fluorescence intensity.
Example 2
(1) Sequentially adding 92 ml of absolute ethyl alcohol, 17.2 ml of water, 2.48 ml of concentrated ammonia water and 0.10 g of methylene blue into a beaker, stirring for 15 minutes, adding 3.44 ml of ethyl orthosilicate, stirring for 4 hours, performing centrifugal separation to obtain a precipitate, washing the precipitate twice with 120 ml of ethanol, washing once with 20 ml of acetate buffer solution with pH =3.6, and drying the precipitate obtained through centrifugal separation at 70 ℃ for 24 hours to obtain silicon dioxide particles containing the methylene blue;
(2) dissolving shellac in ethanol to prepare a shellac solution, wherein the concentration of shellac is 10 g/l, putting the silica particles containing methylene blue prepared in step (1) into 10 ml of shellac solution to make the concentration of the silica particles containing methylene blue 10 g/l, performing ultrasonic treatment for 5 minutes, adding 30 ml of n-heptane into the shellac solution containing the silica particles containing methylene blue at a speed of 0.5 ml/min, stirring for 2 hours, performing centrifugal separation to obtain a precipitate, washing the precipitate with 20 ml of deionized water, and drying at room temperature for 12 hours to prepare the silica/shellac composite particles containing methylene blue with high fluorescence intensity.
Example 3
(1) Sequentially adding 92 ml of absolute ethyl alcohol, 17.2 ml of water, 2.48 ml of concentrated ammonia water and 0.10 g of methylene blue into a beaker, stirring for 15 minutes, adding 3.44 ml of ethyl orthosilicate, stirring for 4 hours, performing centrifugal separation to obtain a precipitate, washing the precipitate twice with 120 ml of ethanol, washing once with 20 ml of acetate buffer solution with pH =3.6, and drying the precipitate obtained through centrifugal separation at 70 ℃ for 24 hours to obtain silicon dioxide particles containing the methylene blue;
(2) dissolving shellac in ethanol to prepare a shellac solution, wherein the concentration of shellac is 20 g/l, putting the silica particles containing methylene blue prepared in step (1) into 10 ml of shellac solution to make the concentration of the silica particles containing methylene blue 10 g/l, performing ultrasonic treatment for 5 minutes, adding 30 ml of n-heptane into the shellac solution containing the silica particles containing methylene blue at a speed of 0.5 ml/min, stirring for 2 hours, performing centrifugal separation to obtain a precipitate, washing the precipitate with 20 ml of deionized water, and drying at room temperature for 12 hours to prepare the silica/shellac composite particles containing methylene blue with high fluorescence intensity.
Claims (1)
1. A preparation method of a silica/shellac composite particle containing methylene blue with high fluorescence intensity is characterized by comprising the following steps:
step 1, sequentially adding ammonia water and methylene blue into a mixed solution containing water and ethanol, stirring for 15 minutes, then adding ethyl orthosilicate, wherein the volume ratio of the water to the ethanol to the ammonia water to the ethyl orthosilicate is 5:26.74:0.72:1, the concentration of the methylene blue is 2.32 millimole per liter, stirring for 4 hours, then carrying out centrifugal separation to obtain a sediment, washing the sediment twice with ethanol, and then washing once with an acetate buffer solution with the pH =3.6, wherein the volume ratio of the ethanol to the acetate buffer solution to the ethyl orthosilicate is 34.88:1 and 5.81:1 respectively, and then drying the sediment obtained through the centrifugal separation at 70 ℃ for 24 hours to obtain silica particles containing the methylene blue;
step 2, dissolving shellac in ethanol to prepare shellac solution, wherein the concentration of shellac is 5-20 grams per liter, putting the silica particles containing methylene blue prepared in step 1 into shellac solution so that the concentration of the silica particles containing methylene blue is 10 grams per liter, performing ultrasonic treatment for 5 minutes, n-heptane was added at a rate of 0.5 ml/min to the shellac solution containing silica particles containing methylene blue, wherein the volume ratio of n-heptane to shellac solution containing silica particles containing methylene blue is 3:1, stirring for 2 hr, centrifuging to obtain precipitate, washing the precipitate with deionized water, drying at room temperature for 12 hr, wherein the volume ratio of the deionized water to the shellac solution containing silica particles containing methylene blue is 2:1, thus obtaining the silica/shellac composite particle containing methylene blue with high fluorescence intensity.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101384238A (en) * | 2006-02-13 | 2009-03-11 | 宝洁公司 | Dye-containing pellets and their use |
| CN107213885A (en) * | 2017-06-22 | 2017-09-29 | 山东理工大学 | A kind of preparation method for the Silica-coated particle containing methylene blue for preventing methylene blue from outwards discharging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101384238A (en) * | 2006-02-13 | 2009-03-11 | 宝洁公司 | Dye-containing pellets and their use |
| CN107213885A (en) * | 2017-06-22 | 2017-09-29 | 山东理工大学 | A kind of preparation method for the Silica-coated particle containing methylene blue for preventing methylene blue from outwards discharging |
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