[1] Guo Liping, , Wang Hong, et al. Dispersion of graphene in silane coupling agent aqueous solutions [J]. Journal of Southeast University (English Edition), 2020, 36 (1): 67-72. [doi:10.3969/j.issn.1003-7985.2020.01.009]

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Dispersion of graphene in silane coupling agent aqueous solutions()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

36

Issue:

2020 1

Page:

67-72

Research Field:

Materials Sciences and Engineering

Publishing date:

2020-03-20

Info

Title:

Dispersion of graphene in silane coupling agent aqueous solutions

Author(s):

Guo Liping¹;  2;  3;  Wang Hong¹;  Chen Bo⁴;  Qian Wenxun⁴

¹ School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
² Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
³ Collaborative Innovation Centre for Advanced Civil Engineering Materials, Southeast University, Nanjing 211189, China
⁴ State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China

Keywords:

graphene;  silane coupling agent;  surface modification;  dispersibility

PACS:

TU528

DOI:

10.3969/j.issn.1003-7985.2020.01.009

Abstract:

In order to reduce the agglomeration of nanographene and improve its dispersibility, six silane coupling agents were used to modify the surface of the nanographene particles. Visual inspection, Fourier-transform infrared spectroscopy, transmission electron microscopy, Raman spectroscopy, and X-ray diffraction were employed to evaluate the dispersion properties of the resulting graphene in an aqueous solution of silane coupling agents. Results show that all six types of silane coupling agents are efficient in promoting the dispersion of graphene in aqueous solutions, and no obvious sedimentation of the graphene dispersion solution is observed after a stationary storage period of 30 d. Taking 3-aminopropyltriethoxysilane(KH-550)as an example, after the graphene is dispersed in the KH-550 aqueous solution, the carboxyl group on the surface of the graphene reacts with the KH-550 amino group to form an amide bond, and KH-550 is successfully grafted onto the graphene surface. Polar functional groups ionize in water, creating an electrostatic repulsion effect, or hydrophilic functional groups form hydrogen bonds with water molecules, which is believed to improve the dispersion stability of graphene. The dispersed graphene is curled and contains many folds. Each fold has about three or four layers, with an interlayer spacing of about 0.65 nm. The dispersed graphene also has a complete lattice and a reduced number of defects. Nanographene disperses well in silane coupling agent aqueous solutions and can, therefore, be used to prepare cement-based composites.

References:

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Memo

Memo:

Biography: Guo Liping(1979—), female, doctor, associate professor, guoliping691@163.com.
Foundation items: The National Key R& D Program of China(No. 2018YFC0406701), the National Natural Science Foundation of China(No. 51778133, 51739008).
Citation: Guo Liping, Wang Hong, Chen Bo, et al.Dispersion of graphene in silane coupling agent aqueous solutions[J].Journal of Southeast University(English Edition), 2020, 36(1):67-72.DOI:10.3969/j.issn.1003-7985.2020.01.009.

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