With the increasing quality of concrete construction, the requirements for concrete performance have also gradually increased. In this paper, the effect of nano-materials on concrete performances was investigated by incorporating nano-materials (nano-SiO2 and nano-Fe₂O₃) into concrete to prepare high performance concrete. The optimum content of nano-materials was determined by response surface method (RSM). Revealing the influence mechanism of nano-material on concrete performance. The results showed that the addition of nano-materials remarkably enhanced the mechanical properties of concrete. When the dosage of nano-SiO₂ was 3.54% and the dosage of nano-Fe₂O₃ was 4.24%, it was the optimal dosage of nano-materials. The compressive, splitting tensile, and flexural strength of concrete were 67.27 MPa, 8.95 MPa, and 9.56 MPa, respectively, at this dosage. The two types of nano-materials can achieve excellent coupling effect. Nano-SiO₂ acts as an auxiliary cementing material, while Nano-Fe₂O₃ mainly acts as a catalyst to improve the hydration reaction rate of cementing materials. According to the microstructure of nano-concrete and energy dispersive spectrometer (EDS) elemental analysis, it was concluded that the incorporation of nano-materials could not produce new kinds of hydration products in concrete, but could produce more hydration products. The research results can provide theoretical reference for the preparation of HPC.

Two-dimensional (2D) nano-materials have provided attraction for many researchers in the innovation of viable routes for large scale synthesis, doping and integration of mono-layers and the development of unique materials with excellent properties. Graphene-based 2D nano-materials are promising agents for several biosensor and bioelectronics applications due to their intriguing properties. In this review, a detailed discussion on preparation, synthesis, properties, and characterization of graphene and graphene-based 2D nano-materials focusing on bioelectronics and biosensors has been carried out and the findings have been provided. Discussions relating to the current review might provide motivation for the future researchers to perform more studies on graphene-based 2D nano-materials and explore more applications in such a way that it can be used as cost effective alternative for the conventional materials. Further this review provides the critical over look on this topic, highlighting the major unexplored areas which require future investigation.

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Jenny
Journal Co-ordinator
Journal of Nano Research & Applications