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The mechanism of fluidity improvement of cement slurry by graphene oxide: a study on nanofriction.
Ji, Xiang; Hou, Dongshuai; Wang, Muhan; Qing, Liu; Hong, Fen; Wang, Yanshuai; Fang, Guohao; Hong, Shuxian; Li, Mengmeng.
Afiliação
  • Ji X; Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China. limengmeng7@126.com.
  • Hou D; Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China. limengmeng7@126.com.
  • Wang M; Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China. limengmeng7@126.com.
  • Qing L; Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China. limengmeng7@126.com.
  • Hong F; Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China. limengmeng7@126.com.
  • Wang Y; College of Civil and Transportation Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen Key Laboratory for Low-carbon Construction Material and Technology, Shenzhen University, Shenzhen, China.
  • Fang G; College of Civil and Transportation Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen Key Laboratory for Low-carbon Construction Material and Technology, Shenzhen University, Shenzhen, China.
  • Hong S; College of Civil and Transportation Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen Key Laboratory for Low-carbon Construction Material and Technology, Shenzhen University, Shenzhen, China.
  • Li M; Department of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China. limengmeng7@126.com.
Phys Chem Chem Phys ; 26(14): 10579-10588, 2024 Apr 03.
Article em En | MEDLINE | ID: mdl-38505975
ABSTRACT
Graphene oxide (GO) as a nano-reinforcing material has received extensive attention in cement composite materials. This paper employed molecular dynamics to simulate the friction process of calcium silicate hydrate (CSH) particles in the presence of double-sided and single-sided GCOOH (graphene oxide with a -COOH functional group, covering 10% of the surface). The investigation uncovered the lubricating effects of bifacial and unifacial GCOOH on the CSH interface. The findings indicate that the interfacial friction among CSH particles follows the sequence of double-sided GCOOH > pure CSH > single-sided GCOOH. In the double-sided GCOOH system, a greater external force is needed on the opposing side to alter the interaction with water molecules, calcium ions, and silica-oxygen tetrahedra, thereby enhancing friction. In contrast, the majority of the carboxyl groups on the single-sided GCOOH surface are strongly adsorbed onto the CSH surface, facilitating the entry of additional water molecules into the interlayer. Conversely, the unmodified side of the GCOOH has lower interactions with water molecules, hence improving its lubricating properties.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article