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• W2885871170 abstract "Abstract Many literature have reported that the dispersion of carbon nanomaterials (CNs) in cement matrix can be improved by incorporating silica fume (SF) due to its ultra-fine size. Most of works characterized the dispersion of CNs and SF in hardened cement matrix by scanning electron microscopy (SEM) and investigated their dispersion by measuring the mechanical properties of cement composites modified by both. However, SEM is not a good tool to investigate the dispersion of nano-scaled materials in macro-scaled cement matrix due to the extreme high magnification, and the interaction between the SF and CNs in cement matrix is still not clear and hardly to be revealed due to the small dosage of both in cement. The present work aims to give a comparative study on the effect of SF on the dispersion and stability of graphene oxide (GO), one of the most popular CNs, in the solutions of neutral water and alkaline cement pore solutions (CPS), instead of hardened cement matrix. The UV–vis spectroscopy and zeta potential results indicate that the addition of SF can improve the dispersion and stability of GO in water. GO can cover the surface of SF by H-bonding and make the surface charge of SF more negative, and therefore enhance the dispersion of GO covered SF in water via stronger electrostatic repulsion. In addition, the particle size distribution results indicate that the addition of SF also reduces the size of GO from 1.8 μm to 0.8 μm, indicating that SF contributes to disaggregation of GO and improves the dispersion of GO in water. However, the addition of SF has a negative effect on the dispersion of GO in CPS, and the interaction between the SF and GO is totally different in CPS due to the rich of divalent cations (Ca2+), which can interlock the SF and GO and lead to the re-agglomeration and worse dispersion of SF-GO in CPS." @default.
• W2885871170 created "2018-08-22" @default.
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• W2885871170 date "2018-11-01" @default.
• W2885871170 modified "2023-10-17" @default.
• W2885871170 title "Comparative evaluation on the dispersion and stability of graphene oxide in water and cement pore solution by incorporating silica fume" @default.
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• W2885871170 doi "https://doi.org/10.1016/j.cemconcomp.2018.08.011" @default.
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