Highly dispersed carbon nanotube reinforced cement based materials
Highly dispersed carbon nanotube reinforced cement based materials
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DOI：
10.1016/j.cemconres.2010.02.015
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发表时间：
2010-07-01
影响因子：
11.4
通讯作者：
Shah, Surendra P.
中科院分区：
文献类型：
--
作者：
Konsta-Gdoutos, Maria S.;Metaxa, Zoi S.;Shah, Surendra P.
碳纳米管(CNT)优异的力学性能使其成为高性能水泥基复合材料的理想材料。然而，与在水泥基材料中掺入碳纳米管相关的主要挑战是分散性差。在这项研究中，不同长度的多壁碳纳米管(MWCNTs)在水中的有效分散是通过施加超声波能量并结合使用表面活性剂来实现的。考察了超声能量和表面活性剂浓度对水泥用量为0.08wt%时碳纳米管分散性的影响。结果表明，要实现适当的分散，超声能量的应用是必不可少的，而要实现完全分散，存在一个最佳的表面活性剂与碳纳米管的质量比。在表面活性剂与多壁碳纳米管的比例一定的情况下，研究了多壁碳纳米管的类型(长短)和浓度对纳米复合材料断裂性能、纳米性能和微观结构的影响。结果表明，多壁碳纳米管改善了水泥浆体的纳米和宏观力学性能。(C)2010爱思唯尔有限公司。保留所有权利。
The remarkable mechanical properties of carbon nanotubes (CNT) suggest that they are ideal candidates for high performance cementitious composites. The major challenge however, associated with the incorporation of CNTs in cement based materials is poor dispersion. In this study, effective dispersion of different length multiwall carbon nanotubes (MWCNTs) in water was achieved by applying ultrasonic energy and in combination with the use of a surfactant. The effects of ultrasonic energy and surfactant concentration on the dispersion of MWCNTs at an amount of 0.08 wt.% of cement were investigated. It is shown that for proper dispersion the application of ultrasonic energy is absolutely required and for complete dispersion there exists an optimum weight ratio of surfactant to CNTs. For a constant ratio of surfactant to MWCNTs, the effects of MWCNT type (short and long) and concentration on the fracture properties, nanoscale properties and microstructure of nanocomposite materials were also studied. Results suggest that MWCNTs improve the nano- and macromechanical properties of cement paste. (C) 2010 Elsevier Ltd. All rights reserved.