Barriers to achieving highly dispersed graphene oxide in cementitious composites: An experimental and computational study

被引:66
作者
Sabziparvar, A. M. [1 ]
Hosseini, E. [1 ]
Chiniforush, V. [1 ]
Korayem, A. H. [1 ]
机构
[1] Iran Univ Sci & Technol, Sch Civil Engn, Tehran, Iran
关键词
Graphene oxide; Agglomeration; Cementitious nanocomposites; DFT calculations; Molecular dynamics simulation; Alkaline media; MECHANICAL-PROPERTIES; AQUEOUS-SOLUTIONS; CARBON NANOTUBES; MICROSTRUCTURE; BEHAVIOR; GO; NANOPARTICLES; AGGREGATION; ASSIGNMENT; STABILITY;
D O I
10.1016/j.conbuildmat.2018.12.030
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Graphene oxide (GO) has aroused the interests of researchers as an effective nano-reinforcement for cementitious composites. However, its application to the cementitious environments is severely limited mainly because of its agglomeration. This paper investigates the effect of influential factors including cations, pH value and surfactants on GO agglomeration in the cementitious environments to achieve highly dispersed GO-cement composites. In addition to the experimental studies, molecular dynamics simulations and quantum calculations were also employed to help better understanding of the mechanisms. Results show that multivalent cations like Ca2+ are more detrimental in case of GO agglomeration in the cementitious environment, compared to the monovalents. Moreover, it was found that there is a correlation between the dispersion state of GO and intensity of alkali media of cementitious environment. In mild alkali media, an increment in pH from 7 to about 10.9 causes more ionization and electrostatic repulsion, which leads to better dispersion. However, at high alkali media with pH larger than 10.9 GO dispersion undergoes reduction when pH increases. It is because GO loses the majority of its functional groups and eventually agglomerates. Among examined surfactants, polycarboxylate ether based super plasticizer shows the best capability to disperse GO in the cementitious environment. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:269 / 278
页数:10
相关论文
共 41 条
[1]   A molecular dynamics and microporomechanics study on the mechanical properties of major constituents of hydrated cement [J].
Al-Ostaz, A. ;
Wu, W. ;
Cheng, A. H. -D. ;
Song, C. R. .
COMPOSITES PART B-ENGINEERING, 2010, 41 (07) :543-549
[2]  
American Society for Testing and Materials [ASTM], 2014, C34914 ASTM
[3]  
American Society for Testing and Materials [ASTM], 2014, C34814 ASTM
[4]  
[Anonymous], 1999, C30599 ASTM
[5]   Ultra high performance cement-based composites incorporating low dosage of plasma synthesized carbon nanotubes [J].
Chen, Zhitao ;
Lim, Jacob Lok Guan ;
Yang, En-Hua .
MATERIALS & DESIGN, 2016, 108 :479-487
[6]   Investigation on dispersion of graphene oxide in cement composite using different surfactant treatments [J].
Chuah, Samuel ;
Li, Wengui ;
Chen, Shu Jian ;
Sanjayan, Jay G. ;
Duan, Wen Hui .
CONSTRUCTION AND BUILDING MATERIALS, 2018, 161 :519-527
[7]   Applications of NMR Crystallography to Problems in Biomineralization: Refinement of the Crystal Structure and 31P Solid-State NMR Spectral Assignment of Octacalcium Phosphate [J].
Davies, Erika ;
Duer, Melinda J. ;
Ashbrook, Sharon E. ;
Griffin, John M. .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2012, 134 (30) :12508-12515
[8]   A review of the impact of micro- and nanoparticles on freeze-thaw durability of hardened concrete: Mechanism perspective [J].
Ebrahimi, Khashayar ;
Daiezadeh, Mohammad Javad ;
Zakertabrizi, Mohammad ;
Zahmatkesh, Farhad ;
Korayem, Asghar Habibnejad .
CONSTRUCTION AND BUILDING MATERIALS, 2018, 186 :1105-1113
[9]   Preparation and characterization of foamed polyurethane/silicone rubber/graphite nanocomposite as radio frequency wave absorbing material: The role of interfacial compatibilization [J].
Esfahani, A. R. Shafieizadegan ;
Katbab, A. A. ;
Dehkhoda, P. ;
Karami, H. R. ;
Barikani, M. ;
Sadeghi, S. H. H. ;
Ghorbani, A. .
COMPOSITES SCIENCE AND TECHNOLOGY, 2012, 72 (03) :382-389
[10]  
Everett D. H., 2007, Basic principles of colloid science