Preparation, with graphene, of novel biomimetic self-healing microcapsules with high thermal stability and conductivity

doi:10.1007/s11709-023-0027-5

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (8) : 1188-1198 https://doi.org/10.1007/s11709-023-0027-5

RESEARCH ARTICLE

Preparation, with graphene, of novel biomimetic self-healing microcapsules with high thermal stability and conductivity

Ying-Yuan WANG¹, Yi-Qiu TAN^1,²(

)

¹. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
². State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China

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Abstract

This paper reports a comparative study of microcapsules with enhanced thermal stability and electrical conductivity inspired by the bionic thermal insulation of birds’ feathers for self-healing aged asphalt. The work is based on an in situ polymerization with composite shell components of graphene and hexamethoxymethylmelamine resin. By using graphene, microcapsules with rough surfaces are achieved, improving the interface between microcapsules and asphalt. In addition, the microcapsules’ initial thermal decomposition temperature is appropriately high, so that the stability of the microcapsule in the asphalt highway system is protected. The proportion of graphene in the microcapsule shell can regulate the microcapsule’s heat resistance because graphene modifies the shell’s structural makeup. Additionally, the microcapsules’ electrical conductivity is relatively high. The self-healing capability of bitumen sharply increases, providing benefit to the effect of microcapsules on the properties of aged asphalt.

Keywords graphene microcapsule bitumen heat insulation conductivity

Corresponding Author(s): Yi-Qiu TAN

About author:

Peng Lei and Charity Ngina Mwangi contributed equally to this work.

Just Accepted Date: 14 August 2023 Online First Date: 27 September 2023 Issue Date: 16 November 2023

Cite this article:

Ying-Yuan WANG,Yi-Qiu TAN. Preparation, with graphene, of novel biomimetic self-healing microcapsules with high thermal stability and conductivity[J]. Front. Struct. Civ. Eng., 2023, 17(8): 1188-1198.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-023-0027-5
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I8/1188

Tab.1 Different types of microcapsules

Fig.1 Morphology of different kinds of microcapsules: (a) TGM-0; (b) TGM-1-1; (c) TGM-2-1; (d) TGM-1-2; (e) TGM-2-2.

Fig.2 SEM images of the microcapsules with 7% graphene: (a) the microcapsules prepared by the method TGM-1; (b) the microcapsules prepared by the method TGM-2.

Fig.3 Optical images of various dry microcapsule powders: (a) microcapsules without graphene; (b) microcapsules prepared by TGM-1; (c) microcapsules prepared by TGM-2.

Fig.4 FTIR spectra of the microcapsules.

Fig.5 XRD pattern of samples: (a) TGM-0; (b) TGM-1-1; (c) TGM-2-1.

Fig.6 Preparation mechanisms of microcapsules: (a) the illustration of resin generation process; (b) the process of method TGM-1; (c) the process of method of TGM-2.

Fig.7 TGA curves of resin and microcapsules: (a) resin; (b) microcapsules of TGM-0; (c) microcapsules of TGM-1-1; (d) microcapsules of TGM-2-1.

Fig.8 TGA cures of microcapsules: (a) the sample of TGM-1-2; (b) the sample of TGM-2-2.

Fig.9 Illustration of shell of microcapsules: (a) formation process and microstructure of shell; (b) villous structure of birds’ feathers.

Fig.10 Self-healing ability test of asphalt.

Fig.11 Change in self-healing capacity of asphalt.

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