Functionalized hexagonal boron nitride nanoplatelets for advanced cementitious nanocomposites
Functionalized hexagonal boron nitride nanoplatelets for advanced cementitious nanocomposites
复制标题
DOI：
10.1016/j.cemconcomp.2023.105127
复制
发表时间：
2023-05
影响因子：
10.5
通讯作者：
Panagiotis A. Danoglidis;Cory M. Thomas;Myrsini E. Maglogianni;M. Hersam;M. Konsta-Gdoutos
中科院分区：
文献类型：
--
作者：
Panagiotis A. Danoglidis;Cory M. Thomas;Myrsini E. Maglogianni;M. Hersam;M. Konsta-Gdoutos
采用低体积分数的六方氮化硼（hBN）纳米片成功制备了波特兰水泥基纳米复合材料，并使用球磨和超声辅助分散相结合的方法进行了剥离和功能化。通过原子力显微镜和拉曼分析对纳米薄片的表面形貌、厚度、横向尺寸和层数进行了评价。通过FTIR鉴定了功能化hBN上的官能团。结果表明，功能化成功地将hBN纳米片剥离到很少的层厚，从而获得了具有高胶体稳定性的悬浮液。hBN表面接枝的羟基和羧基与硅酸钙水合物（CSH）的Ca2+离子相互作用，提高了从水泥基体到hBN纳米片的负载传递效率。总体而言，hBN增强胶凝复合材料的抗弯强度提高了50%，抗压强度提高了17%，杨氏模量提高了56%，断裂能提高了76%。
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%.