TY - JOUR
T1 - Functionalized hexagonal boron nitride nanoplatelets for advanced cementitious nanocomposites
AU - Danoglidis, Panagiotis A.
AU - Thomas, Cory M.
AU - Maglogianni, Myrsini E.
AU - Hersam, Mark C.
AU - Konsta-Gdoutos, Maria S.
N1 - Funding Information:
The authors acknowledge support from the National Science Foundation Partnerships for Research and Education in Materials (Award Number NSF DMR-2122128 ) and the Northwestern University Materials Research Science and Engineering Center (Award Number NSF DMR-1720139 ). Master Builders Solutions Admixtures US, LLC is kindly acknowledged for providing the chemical admixtures. C.M.T. gratefully acknowledges the support of the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1842165 .
Publisher Copyright:
© 2023
PY - 2023/8
Y1 - 2023/8
N2 - Portland cement-based nanocomposites were successfully fabricated with low volume fractions of hexagonal boron nitride (hBN) nanoplatelets, exfoliated and functionalized using a combination of ball milling and sonicated-assisted dispersion. Surface topography, thickness, lateral dimension, and number of layers of the hBN nanoplatelets were evaluated by AFM and Raman analysis. The identification of functional groups attached onto the functionalized hBN was performed through FTIR. The results show that the functionalization successfully exfoliates the hBN nanoplatelets to few-layer thicknesses, resulting in suspensions with high colloidal stability. The grafted hydroxyl and carboxyl groups on the hBN surface interact with the Ca2+ ions of calcium silicate hydrates (CSH), improving the load-transfer efficiency from the cement matrix to the hBN nanoplatelets. Overall, the hBN reinforced cementitious composites demonstrated significant enhancement in flexural strength by ∼50%, compressive strength by ∼17%, Young's modulus by ∼56%, and fracture energy by ∼76%.
AB - Portland cement-based nanocomposites were successfully fabricated with low volume fractions of hexagonal boron nitride (hBN) nanoplatelets, exfoliated and functionalized using a combination of ball milling and sonicated-assisted dispersion. Surface topography, thickness, lateral dimension, and number of layers of the hBN nanoplatelets were evaluated by AFM and Raman analysis. The identification of functional groups attached onto the functionalized hBN was performed through FTIR. The results show that the functionalization successfully exfoliates the hBN nanoplatelets to few-layer thicknesses, resulting in suspensions with high colloidal stability. The grafted hydroxyl and carboxyl groups on the hBN surface interact with the Ca2+ ions of calcium silicate hydrates (CSH), improving the load-transfer efficiency from the cement matrix to the hBN nanoplatelets. Overall, the hBN reinforced cementitious composites demonstrated significant enhancement in flexural strength by ∼50%, compressive strength by ∼17%, Young's modulus by ∼56%, and fracture energy by ∼76%.
KW - Exfoliation
KW - Hexagonal boron nitride
KW - Modulus of elasticity
KW - Number of layers
KW - Surface functionalization
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U2 - 10.1016/j.cemconcomp.2023.105127
DO - 10.1016/j.cemconcomp.2023.105127
M3 - Article
AN - SCOPUS:85160333334
SN - 0958-9465
VL - 141
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 105127
ER -