A simple atomization approach enables monolayer dispersion of nano graphenes in cementitious composites with excellent strength gains  

作　　者：Nanxi Dang Rijiao Yang Chengji Xu Yu Peng Qiang Zeng Weijian Zhao Zhidong Zhang 

机构地区：[1]College of Civil Engineering and Architecture,Zhejiang University,310058,Hangzhou,China [2]Center for Balance Architecture,Zhejiang University,Hangzhou,310028,China [3]The Architectural Design&Research Institute of Zhejiang University Co.,Ltd,Hangzhou,310063,China [4]Institute for Building Materials,ETH Zurich,8093,Zurich,Switzerland

出　　处：《Nano Materials Science》2024年第2期211-222,共12页纳米材料科学（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities(No.226-2023-00010);National Natural Science Foundation of China(No.52038004);ZJU-ZCCC Institute of Collaborative Innovation(No.ZDJG2021008).

摘　　要：Carbon nano additives(CNAs)are critical to achieving the unique properties of functionalized composites,however,controlling the dispersion of CNAs in material matrix is always a challenging task.In this study,a simple atomization approach was successfully developed to promote the dispersion efficiency of graphene nanoplatelets(GNPs)in cement composites.This atomization approach can be integrated with the direct,indirect and combined ultrasonic stirrings in a homemade automatic stirring-atomization device.Mechanical and microstructure tests were performed on hardened cement pastes blended with GNPs in different stirring and mixing approaches.Results show that the direct ultrasonic stirrings enabled more homogeneous dispersions of GNP particles with a smaller size for a longer duration.The atomized droplets with the mean size of~100μm largely mitigated GNPs’agglomerations.Monolayer GNPs were observed in the cement matrix with the strength gain by up to 54%,and the total porosity decrease by 21%in 0.3 wt%GNPs dosage.The greatly enhanced dispersion efficiency of GNPs in cement also raised the cement hydration.This work provides an effective and manpower saving technique toward dispersing CNAs in engineering materials with great industrialization prospects.

关 键 词：NANOMATERIALS DISPERSION ATOMIZATION STRENGTH Microstructure 

分 类 号：TB33[一般工业技术—材料科学与工程]