Hollow nanosphere material as well as preparation method and application thereof

A technology of nanospheres and carbon nanospheres, which is applied in nanocarbons, chemical instruments and methods, and pharmaceutical formulations, and can solve problems such as collapse, rupture, and difficulty in maintaining three-dimensional network gel pores.

Active Publication Date: 2013-12-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cross-linking degree of hollow polymer nanosphere shells is usually low, and many hollow polymer nanospheres will appear obvious wrinkles, collapse or even rupture after drying, although they can maintain the excellent hollow nanosphere structure in solution.
At the same time, for hollow polymer nanospheres with cross-linked shells, due to the strong capillary tension during drying, the three-dimensional network gel pores formed by the swelling of their cross-linked shells in good solvents are difficult to obtain after drying. Keep
More importantly, the crosslinked shells of most hollow polymer nanospheres have poor char formation properties, so they cannot be directly carbonized to form conductive hollow carbon nanospheres.

Method used

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  • Hollow nanosphere material as well as preparation method and application thereof
  • Hollow nanosphere material as well as preparation method and application thereof
  • Hollow nanosphere material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) adopt Monodisperse silica nanospheres were prepared by the following method: Prepare ethanol / tetraethyl orthosilicate (202.5mL / 22.4mL) and ethanol / ammonia / water (112.5mL / 8.4mL / 104.1 mL) of the mixed solution, and quickly mixed evenly, set the stirring rate to 250rpm, and reacted at 30°C for 3h to obtain monodisperse silica nanospheres. Then, 2ml of silane coupling agent KH-570 was dissolved in 100ml of ethanol, and added into the above reaction system with a dropping funnel, and the reaction was continued for 36h after the addition was completed, to obtain modified silica nanospheres.

[0054] (2) Dissolve 0.03g of sodium dodecylbenzenesulfonate and 0.24g of sodium bicarbonate in 100mL of deionized water that has been deoxygenated beforehand, stir well until the system is uniform, and pass nitrogen gas into the system for 15 minutes to remove oxygen. Then, ultrasonically dispersed modified silica ethanol dispersion (1.2 g of modified silica nanospheres prepared in...

Embodiment 2

[0062] (1) The preparation of hollow polymer nanospheres is the same as the steps (1) to (4) of Example 1.

[0063] (2) Put the hollow polymer nanosphere material prepared above in a carbonization furnace, raise the temperature to 900°C at a heating rate of 5°C / min under an inert gas atmosphere, and then carbonize at a constant temperature for 3 hours to obtain hollow carbon nanospheres Material.

[0064] The ASAP2020 adsorption instrument nitrogen adsorption method produced by Micromeritics Company of the United States was used for testing. see test results Figure 4 , the BET specific surface area of ​​the prepared hollow carbon nanospheres is 1034m 2 g - , where the surface areas of micropores and external pores are 848 m 2 g - and 186m 2 g - ; total pore volume in cm 3 g -1 , where the micropore volume and the external pore volume are 0.40 cm 3 g -1 and 0.43cm 3 g -1 .

[0065] The above-mentioned hollow carbon nanospheres were used as the electrode material,...

Embodiment 3

[0067] (1) The preparation of monodisperse silica nanospheres is the same as in Example 1.

[0068] (2) Dissolve 0.03g of sodium dodecylbenzenesulfonate and 0.24g of sodium bicarbonate in 100mL of deionized water that has been deoxygenated beforehand, stir well until the system is uniform, and pass nitrogen gas into the system for 15 minutes to remove oxygen. Then ultrasonically dispersed modified silica ethanol dispersion (1.2 g of silica nanospheres dispersed in 10 mL of ethanol) was added and vigorously stirred. After the system is uniform, add 10mL of styrene and 3mL of divinylbenzene to the system, stir for 10min, then raise the temperature to 75°C, add 0.12g of initiator potassium persulfate, react for 24h, centrifuge and wash with toluene to remove the surfactant.

[0069] (3) Disperse 1 g of the pre-crosslinked polymer nanospheres obtained in (2) above in 60 ml of carbon tetrachloride and swell for 12 h, then raise the temperature to 75 ° C, add 2.8 g of anhydrous alum...

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Abstract

The invention belongs to the technical field of nano material preparation, and discloses a hollow nanosphere material as well as a preparation method and an application thereof. The hollow nanosphere material is obtained by stacking nanospheres, the BET specific surface area of the hollow nanosphere material is 44-1226m<2>g<-1>, the total pore volume of the hollow nanosphere material is 0.15-1.20cm<3>g<-1>; the nanosphere is of a micropore shell-hollow nano structure, the diameter of the hollow cavity is 80-260nm, the thickness of the shell layer is 5-85nm, single-dispersion coefficient is as low as 0.005, and shell layer material is a polymer or carbon. By utilizing a hyper-crosslinking method, the stable inheritance of the hollow cavity of the polymer nanosphere and grid micropores of the shell layer in the normal-pressure drying and high-temperature carbonization processes is achieved; the single-dispersion coefficient of the hollow nanosphere material is as low as 0.005, the specific surface area is as high as 1226m<2>g<-1>, and the total pore volume is as high as 1.20cm<3>g<-1>.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a hollow nanosphere material and its preparation method and application. Background technique [0002] Hollow nanospheres, especially hollow polymer nanospheres and hollow carbon nanospheres, are important nanomaterials with unique nanoshells and spherical nanohollow cavities surrounded by them. They are widely used in biomedicine, adsorption, separation, catalysis, Energy, nanoreactors and other fields have broad application prospects. [0003] Hollow polymer nanospheres are usually prepared by self-assembly method, template method, (micro) emulsion polymerization and other technologies, and the shell polymer can be divided into two types: linear and cross-linked structures. The purpose of cross-linking is to immobilize the structure, which can improve the mechanical strength, dimensional stability, solvent resistance and chemical stability of hollo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C08F292/00C08F212/08C08F212/36C08J9/26C08J3/24A61K47/04B01J20/20B01J20/28B01J20/30C01B32/15
Inventor 吴丁财陈鹭义欧阳毅康信仁章旭丹林志勇符若文
Owner SUN YAT SEN UNIV
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