Mesoporous silica material with a hollow polyhedral structure and a preparation method thereof

Abstract

The application relates to the technical field of new materials, and discloses a mesoporous silica material with a hollow polyhedral structure, which has a polyhedral structure, a size of 200-300 nm, a polyhedral structure, and a hollow structure inside; the mesoporous silica material is prepared by carrying out a reaction in an emulsion system, taking hexadecyl trimethyl ammonium bromide as a structure directing agent, taking ethyl silicate as a silicon source, taking sodium hydroxide as a catalyst, taking sodium metaborate as a structure regulating agent, and then carrying out a reaction under heating and stirring conditions and then hydrothermal aging; the mesoporous silica material provided by the application has a particle size of about 200-300 nm, has a polyhedral structure, and has a hollow structure inside. The mesoporous silica material provided by the application has superhigh adsorption performance and excellent biological compatibility, can be used in the fields of daily chemicals and biological medicines, and can be used for substance adsorption, drug carriers and the like.

Description

Technical Field

[0001] This invention relates to the field of new materials technology, specifically to a mesoporous silica material with a hollowed-out polyhedral structure and its preparation method. Background Technology

[0002] In recent years, research in the field of new materials has continued to gain momentum, with an increasing number of new materials being developed and widely applied in fields such as biology, medicine, energy, catalysis, and daily chemicals. Mesoporous materials, due to their high specific surface area and controllable structure and morphology, have received widespread attention and welcome, and have shown unique advantages in some loaded applications. Materials with hollow structures, due to their high specific surface area and open spatial structure, have attracted extensive research attention from various fields.

[0003] Silica is commonly found and widely used in daily life, generally exhibiting excellent stability and biocompatibility. Silica materials can be used as food additives, demonstrating excellent dispersant properties and significantly improving the dispersibility of coffee, milk powder, and flavorings. Silica materials are also widely used in cosmetics for skin feel adjustment, lubrication, and moisturizing. Furthermore, silica materials can be added to rubber polymer products to improve flexibility and abrasion resistance, among other things.

[0004] This invention realizes the construction of a mesoporous silica material with a hollow polyhedral structure, which makes the silica material have a larger internal space, a lighter density, and greatly improves the utilization rate of the material. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a mesoporous silica material with a hollowed-out polyhedral structure and a method for its preparation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mesoporous silica material with a hollow polyhedral structure, which has a polyhedral shape, a size of 200-300 nm, a polyhedral structure, and a hollow internal structure;

[0007] The reaction was carried out in an emulsion system using hexadecyltrimethylammonium bromide as a structure directing agent, ethyl silicate as a silicon source, sodium hydroxide as a catalyst, and sodium metaborate as a structure regulator. The reaction was carried out under heating and stirring conditions, and then hydrothermally aged to prepare mesoporous silica materials.

[0008] Preferably, the preparation method is as follows:

[0009] (1) Dissolve hexadecyltrimethylammonium bromide in water to obtain a clear solution;

[0010] (2) Add sodium hydroxide and sodium metaborate and stir to mix evenly;

[0011] (3) Add tetraethyl silicate, stir evenly, heat to 60°C, and react for 12 hours;

[0012] (4) Then transfer to a hydrothermal reactor and age at 110°C for 24 hours;

[0013] (5) After the reaction is complete, centrifuge and wash with water.

[0014] Preferably, in step (1), the concentration of hexadecyltrimethylammonium bromide in the clarified solution is 0.6~2.5 wt%.

[0015] Preferably, in the solution described in step (2), the concentration of sodium hydroxide is 0.05~0.1 wt% and the concentration of sodium metaborate is 0.5~1.0 wt%.

[0016] Preferably, in step (3), the concentration of tetraethyl silicate is 2.5~3.5wt%.

[0017] Preferably, in step (3), the reaction temperature is 60°C.

[0018] Preferably, in step (4), the aging temperature is 110°C.

[0019] Preferably, the sodium metaborate is used as a structure regulator. First, sodium borate is dissolved in deionized water to prepare a buffer solution with a pH of 9-10. Then, hexadecyltrimethylammonium bromide is added to the buffer solution and stirred to obtain a clear solution.

[0020] Preferably, during the pH adjustment process, the pH value is monitored in real time, and sodium metaborate is added in small amounts multiple times to ensure the pH value of the buffer solution.

[0021] Deionized water is used to avoid the influence of other ions on the pH of the buffer solution.

[0022] Compared with the prior art, the present invention provides a mesoporous silica material with a hollowed-out polyhedral structure and a method for its preparation, which has the following beneficial effects:

[0023] 1. A mesoporous silica material with a hollow polyhedral structure and its preparation method. The mesoporous silica material provided by this invention has a particle size of approximately 200-300 nm, a polyhedral structure, and a hollow internal structure. The mesoporous silica material provided by this invention has ultra-high adsorption performance and excellent biocompatibility, and can be used in the fields of daily chemicals and biomedicine for purposes such as substance adsorption and drug carriers.

[0024] 2. A mesoporous silica material with a hollow polyhedral structure and its preparation method. The mesoporous silica material with a hollow polyhedral structure provided by the present invention has a polyhedral morphology with a size of 200-300 nm and a hollow internal structure; it has good biocompatibility; and it can load or encapsulate various biomolecules, nanoparticles or other desired substances. Attached Figure Description

[0025] Figure 1 Low-magnification transmission electron microscope image of the mesoporous silica material with hollowed-out polyhedral structure prepared by this invention.

[0026] Figure 2 High-magnification transmission electron microscope image of the mesoporous silica material with hollowed-out polyhedral structure prepared by this invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-2 A mesoporous silica material with a hollow polyhedral structure, which has a polyhedral shape and a size of 200-300nm, and has a hollow structure inside;

[0029] The reaction was carried out in an emulsion system using hexadecyltrimethylammonium bromide as a structure directing agent, ethyl silicate as a silicon source, sodium hydroxide as a catalyst, and sodium metaborate as a structure regulator. The reaction was carried out under heating and stirring conditions, and then hydrothermally aged to prepare mesoporous silica materials.

[0030] The specific preparation method is as follows:

[0031] (1) Dissolve hexadecyltrimethylammonium bromide in water to obtain a clear solution;

[0032] (2) Add sodium hydroxide and sodium metaborate and stir to mix evenly;

[0033] (3) Add tetraethyl silicate, stir evenly, heat to 60°C, and react for 12 hours;

[0034] (4) Then transfer to a hydrothermal reactor and age at 110°C for 24 hours;

[0035] (5) After the reaction is complete, centrifuge and wash with water.

[0036] In step (1), the concentration of hexadecyltrimethylammonium bromide in the clarified solution is 0.6~2.5 wt%.

[0037] In the solution described in step (2), the concentration of sodium hydroxide is 0.05~0.1 wt%; and the concentration of sodium metaborate is 0.5~1.0 wt%.

[0038] In step (3), tetraethyl silicate is added at a concentration of 2.5~3.5wt%.

[0039] In step (3), the reaction temperature is 60℃.

[0040] In step (4), the aging temperature is 110℃.

[0041] Sodium metaborate is used as a structure regulator. First, sodium borate is dissolved in deionized water to prepare a buffer solution with a pH of 9-10. Then, hexadecyltrimethylammonium bromide is added to the buffer solution and stirred to obtain a clear solution.

[0042] During the pH adjustment process, the pH value was monitored in real time, and sodium metaborate was added in small amounts multiple times to ensure the pH value of the buffer solution.

[0043] Deionized water is used to avoid the influence of other ions on the pH of the buffer solution.

[0044] Hexadecyltrimethylammonium bromide (1.0 wt%), sodium hydroxide (0.06 wt%), and sodium metaborate (0.8 wt%) were dissolved thoroughly in water to form a clear solution. Tetraethyl silicate (3.0 wt%) was added and stirred until homogeneous. The mixture was then heated to 60°C and reacted for 12 hours. After the reaction was complete, the solution was transferred to a hydrothermal reactor and aged at 110°C for 24 hours. After aging, the solution was centrifuged, dried, and calcined in air at 600°C for 5 hours to obtain the final product.

[0045] Low-magnification transmission electron microscope image of the obtained product is shown below. Figure 1 As shown, the high-magnification transmission electron microscope image of the product is as follows: Figure 2 As shown.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mesoporous silica material with a hollowed-out polyhedral structure, characterized in that: Its shape is a polyhedral structure, with a size of 200-300nm. It has a polyhedral structure and a hollow internal structure. The reaction was carried out in an emulsion system, using hexadecyltrimethylammonium bromide as a structure directing agent, ethyl silicate as a silicon source, sodium hydroxide as a catalyst, and sodium metaborate as a structure regulator. The reaction was carried out under heating and stirring conditions, and then hydrothermally aged to prepare mesoporous silica materials. The specific preparation method is as follows: (1) Dissolve hexadecyltrimethylammonium bromide in water to obtain a clear solution; (2) Add sodium hydroxide and sodium metaborate and stir to mix evenly; (3) Add tetraethyl silicate, stir evenly, heat to 60°C, and react for 12 hours; (4) Then transfer to a hydrothermal reactor and age at 110°C for 24 hours; (5) After the reaction is complete, centrifuge, wash with water, dry, and calcine in air at 600°C for 5 hours to obtain the final product; In step (1), the concentration of hexadecyltrimethylammonium bromide in the clarified solution is 0.6~2.5 wt%; In step (2), the concentration of sodium hydroxide is 0.05~0.1 wt%; the concentration of sodium metaborate is 0.5~1.0 wt%; In step (3), tetraethyl silicate is added at a concentration of 2.5~3.5wt%.

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