Review of Boron Nitride Nanosheet-Based Composites for Construction Applications

Two-dimensional nanoparticles stand out among nanoparticles for their extraordinary mechanical properties, large surface area, and strong interaction with the host matrix, which can boost properties of various construction materials. Boron nitride nanosheets (BNNSs), known as white graphene, show nonsensitive behavior against increasing thickness as well as high chemical and thermal stability that makes them suitable for fabrication of advanced composites in various industries. Despite these proven benefits, the role of BNNS in cementitious composites has not been fully investigated in the literature because of some inconsistent results such as its unfavorable behavior in aqueous solution. This study presents a comprehensive review of BNNS in silicate-based matrices from molecular-level interactions to macroscale properties to give potential avenues for manufacturing boron nitride-based composites for construction applications. The prime focus of this review article is to highlight the role of proper dispersion and stabilization of the dispersed BNNS within both aqueous solutions and cement matrix, which is reflected in the properties of fabricated cementitious composites in their fresh and hardened states. In addition, considering the structural similarity between BNNS and graphene-based nanosheets, the paper also compares BNNS and graphene-based cementitious composites. Finally, the existing gaps of knowledge are highlighted for future studies.