Preparation method of high-thermal-conductivity composite material based on graphitized polydopamine coated metal particles

A polydopamine and metal particle technology, applied in the field of composite materials, can solve problems such as low thermal conductivity, and achieve the effects of high thermal conductivity, simple process and improved thermal conductivity.

Inactive Publication Date: 2021-01-29

TIANJIN UNIV

9 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, have significant anisotropic thermal conductivity for existing graphene material, promptly only have high thermal conductivity (greater than 1000W/(m·K) along graphene plane ) and in the thickness direction perpendicular to its horizontal plane, the thermal conductivity is too...

Abstract

The invention discloses a preparation method of a high-thermal-conductivity composite material based on graphitized polydopamine coated metal particles. The method comprises the following steps of: blending metal particles coated with a layer of thickness-controllable polydopamine with a carbon-based filler by using high thermal conductivity of graphene in the in-plane direction, isotropic thermalconductivity of metal and adhesivity of polydopamine, connecting a graphene sheet layer by using the adhesion of polydopamine, and finally, graphitizing polydopamine and melting metal particles through high-temperature compression treatment, thereby obtaining the high-thermal-conductivity composite material. According to the preparation method, high thermal conductivity of metal and graphitized polydopamine is utilized, and an efficient thermal conduction channel is built between graphene layers, so that the high thermal performance of the material in the thickness direction is effectively improved, the defect of poor thermal conductivity of the material in the thickness direction is overcome, and the high-performance thermal conduction material is prepared.

Application Domain

Material nanotechnologyHeat-exchange elements

Technology Topic

Thermal conductivityGraphite +6

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Examples

Experimental program(6)

Example Embodiment

[0021]Example 1

[0022]1. Weigh 100mg of metal nanoparticles (gold nanorods), disperse them in 10ml of dopamine hydrochloride solution (1mg/ml), stir ultrasonically for 30min, introduce 12.1mg of trimethylolaminomethane to initiate dopamine polymerization, and react at room temperature Afterwards, centrifugal separation obtains polydopamine coated metal particles (modified gold nanorods).

[0023]2. Weigh 0.5g of functionalized graphene and 0.1g of modified gold nanorods and disperse them in 50ml of distilled water respectively. Subsequently, the aqueous dispersion of the modified gold nanorods is gradually added to the graphene dispersion under continuous stirring, so that the modified gold nanorods and the functionalized graphene sheets are fully combined. The dispersion liquid is vacuum filtered to remove the water solvent to obtain a composite membrane material, and then the composite material is supercritically dried to obtain a graphene/gold nanorod composite material.

[0024]3. Place the obtained composite material in a graphite mold, apply a pressure of 0.5 MPa, and preheat the composite material in a tube furnace at 800°C for 1 h under inert gas conditions, and then place the composite material in the graphite mold to maintain the pressure Change, perform melting treatment of metal particles and graphitization treatment of polydopamine at 1500℃ for 1h to convert gold nanorods into liquid metal dispersion, graphitized polydopamine links metal and graphene, and finally obtain graphene/gold particles Composite materials. The thermal conductivity of the tested material is 815W/(m·K) in the plane direction and 86W/(m·K) in the thickness direction.

Example Embodiment

[0025]Example 2

[0026]1. Weigh 100mg of metal nanoparticles (gold nanosheets), disperse them in 15ml of dopamine hydrochloride solution (1mg/ml), stir ultrasonically for 30 minutes, introduce 15.5mg of tris(hydroxymethyl)aminomethane to initiate dopamine polymerization, and react at room temperature Afterwards, centrifugal separation obtains polydopamine-coated metal particles (modified gold nanosheets).

[0027]2. Weigh 0.5 g of functionalized graphene and 0.1 g of modified gold nanosheets, and disperse them in 50 ml of distilled water. Subsequently, the aqueous dispersion of the modified gold nanosheets is gradually added to the graphene dispersion under continuous stirring, so that the modified gold nanosheets and the functionalized graphene sheets are fully combined. The dispersion liquid is vacuum filtered to remove the water solvent to obtain a composite membrane material, and then the composite material is supercritically dried to obtain a graphene/modified gold nanosheet composite material.

[0028]3. Place the obtained composite material in a graphite mold, apply a pressure of 1 MPa, and preheat it at 850°C for 1 h under inert gas in a tube furnace, and then place the composite material in a graphite mold to maintain the pressure unchanged , Melt the metal particles and graphitize the polydopamine at 1000°C for 2h to convert the gold nanosheets into liquid metal dispersion. The graphitized polydopamine links the metal and the graphene sheet structure to obtain the graphene/gold Particle composites. The thermal conductivity of the tested material is 865W/(m·K) along the plane and 95W/(m·K) along the thickness.

Example Embodiment

[0029]Example 3

[0030]1. Weigh 100mg of metal nanoparticles (silver nanorods), disperse them in 10ml of dopamine hydrochloride solution (1mg/ml), stir ultrasonically for 30 minutes, introduce 12.1mg of tris(hydroxymethyl)aminomethane to initiate dopamine polymerization, and react at room temperature Afterwards, centrifugal separation obtains polydopamine coated metal particles (modified silver nanorods).

[0031]2. Weigh 0.5 g of functionalized graphene and 0.1 g of modified silver nanorods, and disperse them in 50 ml of distilled water. Subsequently, the aqueous dispersion of the modified silver nanorods is gradually added to the graphene dispersion under continuous stirring, so that the modified silver nanorods and the functionalized graphene sheets are fully combined. The dispersion liquid is vacuum filtered to remove the water solvent to obtain a composite membrane material, and then the composite material is supercritically dried to obtain a graphene/modified silver nanorod composite material.

[0032]3. Place the obtained composite material in a graphite mold, apply a pressure of 5 MPa, and preheat the composite material in a tube furnace at 800 ℃ for 1.5 hours under inert gas conditions, and then place the composite material in the graphite mold to maintain the pressure. Change, melt the metal particles and graphitize the polydopamine at 1800℃ for 1h, convert the silver nanorods into liquid metal dispersion, and graphitize the polydopamine linked metal and graphene sheet structure to obtain graphene /Silver particle composite material. The thermal conductivity of the tested material is 893W/(m·K) in the plane direction and 90W/(m·K) in the thickness direction.

PUM

Property	Measurement	Unit
Thermal conductivity	865.0	W/k/m
Thermal conductivity	893.0	W/k/m

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple process
Improve thermal efficiency

Preparation method of high-thermal-conductivity composite material based on graphitized polydopamine coated metal particles

A polydopamine and metal particle technology, applied in the field of composite materials, can solve problems such as low thermal conductivity, and achieve the effects of high thermal conductivity, simple process and improved thermal conductivity.

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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