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Preparation method of graphite oxide alkene materials in dissymmetrical structure

An asymmetric structure and graphene technology, applied in the field of materials, can solve the problems of high ionization degree of carboxyl groups and reduce the stability of Pickering emulsion, etc., and achieve the effect of low cost, good emulsion stability and simple process

Active Publication Date: 2015-03-04
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene oxide is often excessively hydrophilic due to the high degree of carboxyl ionization, which reduces the stability of the Pickering emulsion. Therefore, it is usually necessary to modify graphene oxide to obtain better emulsion stability.

Method used

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  • Preparation method of graphite oxide alkene materials in dissymmetrical structure
  • Preparation method of graphite oxide alkene materials in dissymmetrical structure
  • Preparation method of graphite oxide alkene materials in dissymmetrical structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Add 1 part of graphene oxide to 100 parts of water, add 0.07 parts of hydrochloric acid and 2 parts of sodium chloride to the aqueous dispersion of graphene oxide, and disperse evenly by ultrasonication for 10 minutes. Add 50 parts of paraffin to the mixture, heat it in a water bath at 70°C for 10 min, keep the water bath, and homogenize at a speed of 20000 r / min for 10 min. After cooling to room temperature, centrifuge at 10,000 r / min for 3 min, and remove the water phase to obtain graphene oxide-coated paraffin microspheres.

[0026] 2. Dissolve the paraffin microspheres prepared above in 100 parts of 50% alcohol aqueous solution, add 2 parts of dodecylamine to it, and stir at room temperature for 12 h.

[0027] 3. After the reaction, wash with 50 parts of ethanol and centrifuge at 10000 r / min for 3 min. Then add 500 parts of chloroform, centrifuge at 10,000 r / min for 3 min, repeat three times to remove paraffin, and finally use 50 parts of ethanol to wash by cent...

Embodiment 2

[0029] 1. Experimental device and operation are the same as embodiment 1, change the graphene oxide in example 1 into 2 parts; Hydrochloric acid is changed into sulfuric acid, and its quality is 0.1 part; Sodium chloride is changed into magnesium chloride, and its quality is 5 parts; Paraffin wax quality Change it to 120 parts; change the water bath temperature to 65 °C; change the homogenization speed to 15000 r / min, and change the homogenization time to 15 min.

[0030] 2. Experimental device and operation are the same as embodiment 1, change the alcoholic aqueous solution in the example 1 into ethanol quality and be 80% of water quality; Change dodecylamine into octyldiamine, and its quality is 3 parts; Change the stirring time into 15 h.

[0031] 3. The experimental device and operation are the same as in Example 1, and the chloroform in Example 1 is changed to cyclohexane, and its mass is 1400 parts.

Embodiment 3

[0033] 1. Experimental device and operation are the same as embodiment 1, change the graphene oxide in the example 1 into 0.5 part; Hydrochloric acid is changed into acetic acid, and its quality is 0.1 part; Sodium chloride is changed into potassium chloride, and its quality is 1 part; The quality of paraffin was changed to 30 parts; the temperature of the water bath was changed to 60 °C; the homogenization was changed to ultrasonic, the ultrasonic power was 300W, and the ultrasonic time was 15min.

[0034] 2. The experimental device and operation are the same as in Example 1, changing the alcoholic aqueous solution in Example 1 into 90% of the water quality in ethanol quality; changing dodecylamine into 3-aminopropyltriethoxysilane, and its quality is 0.5 parts; change the stirring time to 20 h.

[0035] 3. The experimental device and operation are the same as in Example 1, except that the chloroform in Example 1 is changed to n-nonane, and its mass is 400 parts.

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Abstract

The invention belongs to the technical field of materials, and discloses a preparation method of graphite oxide alkene materials with a dissymmetrical structure. The method comprises the steps: using a formwork that oil-in-water Pickering emulsion of paraffine is stabilized by the graphite oxide alkene, performing an epoxy group reaction by using modified agents containing amino and the surface of the graphite oxide alkene to modify a single surface, and then washing to remove the paraffine with solvents to obtain the dissymmetrical modified graphite oxide alkene. The preparation method disclosed by the invention is simple and mild, the raw materials are easy to obtain, the structure of the surface of the graphite oxide alkene can be adjusted, and the amphipathic nature of Janus particles of the graphite oxide alkene can be designed as needed, so that the graphite oxide alkene has better capability for stabilizing the emulsion.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a graphene oxide material with an asymmetric structure. Background technique [0002] Janus particles refer to a class of particles that are asymmetric in shape or chemical composition. The asymmetry makes it exhibit anisotropy in terms of mechanics, magnetism, optics, electrical properties and surface affinity / hydrophobicity. Among them, amphiphilic Janus particles have higher interfacial adsorption energy than homogeneous particles, and can be used in emulsion stabilizers, drug targeted delivery, biosensors and other fields. [0003] The key to preparing Janus particles is to selectively modify the surface of the particles. At present, the main preparation methods include microfluidic device method, self-assembly method, phase separation method, partial shielding method and so on. The Pickering emulsion template method is a kind of parti...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 吴昊王海涛杜强国
Owner FUDAN UNIV
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