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Method for preparing modified micro particles coated with graphene oxide

A graphene-coated, particle-based technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of reduced cement strength, large specific surface area, and increased water demand, to improve performance and operation Simple, even distribution effect

Inactive Publication Date: 2017-04-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems in the application, such as silica fume particles are small, the specific surface area is large, and the increase in water demand will cause a decrease in fluidity. In use, it needs to be used in conjunction with admixtures, which brings inconvenience to construction.
Substituting the same amount of fly ash for cement will reduce the strength of cement, etc.

Method used

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  • Method for preparing modified micro particles coated with graphene oxide
  • Method for preparing modified micro particles coated with graphene oxide
  • Method for preparing modified micro particles coated with graphene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 1g of fly ash into 500ml of absolute ethanol and sonicate for 60min. Add 0.08 g of a silane coupling agent (3-aminopropyltrimethoxysilane), and heat and stir at 80° C. for 12 h. Cool to room temperature after the reaction, centrifuge the obtained suspension with a centrifuge, remove the obtained supernatant, redissolve the centrifuged solid in absolute ethanol, and centrifuge again, repeating 3-5 times. Then, the above steps are repeated using deionized water to remove the residual coupling agent to obtain the fly ash modified by the coupling agent.

[0030] (2) Add 2g of graphite oxide into 500ml of deionized water, stir for 60-120min, and sonicate for 1-2h to prepare a 4mg / ml graphene oxide solution.

[0031] (3) 10ml of graphene oxide solution was added dropwise to the fly ash modified by the coupling agent. With the addition of graphene oxide, the modified fly ash and graphene oxide co-settled to the bottom of the solution due to electrostatic interaction. ...

Embodiment 2

[0034] (1) Add 0.5g of mineral powder into 500ml of absolute ethanol and sonicate for 60min. Add 0.01 g of a silane coupling agent (3-aminopropyltrimethoxysilane), and heat and stir at 80° C. for 12 h. Cool to room temperature after the reaction, centrifuge the obtained suspension with a centrifuge, remove the obtained supernatant, redissolve the centrifuged solid in absolute ethanol, and centrifuge again, repeating 3-5 times. Then repeat the above steps with deionized water to remove the residual coupling agent to obtain the mineral powder modified by the coupling agent.

[0035] (2) Add 2g of graphite oxide into 500ml of deionized water, stir for 60-120min, and sonicate for 1-2h to prepare a 4mg / ml graphene oxide solution.

[0036] (3) 5ml of graphene oxide solution was added dropwise to the mineral powder modified by the coupling agent. With the addition of graphene oxide, the modified mineral powder and graphene oxide co-settled to the bottom of the solution due to electr...

Embodiment 3

[0039] (1) Add 0.1 g of aluminum powder into 0.01 g of silane coupling agent (3-aminopropyltrimethoxysilane), and heat and stir at 80° C. for 12 h. After the reaction, cool down to room temperature, take out the silane coupling agent and wash it repeatedly with deionized water to remove the remaining coupling agent to obtain aluminum powder modified by the coupling agent.

[0040] (2) Add 2g of graphite oxide into 500ml of deionized water, stir for 60-120min, and sonicate for 1-2h to prepare a 4mg / ml graphene oxide solution.

[0041] (3) 5ml of graphene oxide solution was added dropwise to the coupling agent modified aluminum powder, and with the addition of graphene oxide, the modified aluminum powder and graphene oxide co-settled to the bottom of the solution due to electrostatic interaction. The upper layer solution was removed, and the lower layer solid was vacuum-dried at 45-60° C. for 24 hours to obtain graphene oxide-modified aluminum powder.

[0042] The field emissio...

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Abstract

The invention relates to a method for preparing modified micro particles coated with graphene oxide, and the method comprises the following steps: (1) dispersing micro particles into absolute ethanol, adding a silane coupling agent, heating for reaction, cooling and separating to obtain coupling-agent-modified micro particles; (2) dispersing graphite oxide into water to obtain a graphene oxide solution; (3) adding dropwise the graphene oxide solution prepared by the step (2) into the coupling-agent-modified micro particles prepared by the step (1) until the solution is transparent and the coupling-agent-modified micro particles are all precipitated, separating and drying to obtain the modified micro particles coated with the graphene oxide. Compared with the prior art, the surface of the micro particles are coated evenly with the graphene oxide by the functional groups on the surface of the graphene oxide, the graphene oxide and the micro particles are uniformly compounded, performances of the micro particles can be effectively improved, and particle and graphene application and the like can be expanded.

Description

technical field [0001] The invention relates to the technical field of graphene nanomaterials, in particular to a preparation method of graphene oxide-coated modified particles. Background technique [0002] Graphene is carbon atoms with sp 2 A two-dimensional honeycomb lattice structure in which bonds are closely arranged, which is only one carbon atomic layer thick. The special structure of graphene endows it with excellent properties. It can be widely used in fields such as supercapacitors, composite materials and ultrasensitive sensors. However, the strong van der Waals interaction between graphene prevents it from being stably dispersed in solvents, and its compatibility with other materials is not good, which restricts the research and application of graphene. [0003] Graphene oxide is a precursor for preparing graphene, and its thickness is about 1-1.4nm. It is also a two-dimensional carbon material and has many excellent properties like graphene. The structure o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B20/02C04B18/14C04B18/08C04B14/34
CPCC04B20/1055C04B20/023C04B18/146C04B18/08C04B18/141C04B14/34Y02W30/91
Inventor 张东尚玉
Owner TONGJI UNIV
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