氧化石墨烯/碳纳米管增韧水泥基材料
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- 英文论文题名：Enhanced Mechanical Properties of Cement Paste by Hybrid Graphene Oxide/Carbon Nanotubes
- 论文作者：周成 ; 李方贤 ; 胡捷 ; 任萌萌 ; 韦江雄 ; 余其俊
- 英文论文作者：Zhou Cheng ; Li Fangxian ; Hu Jie ; Ren Mengmeng ; Wei Jiangxiong ; Yu Qijun ; School of Materials Science and Engineering ; South China University of Technology
- 年：2016
- 作者机构：华南理工大学材料科学与工程学院;
- 论文关键词：氧化石墨烯 ; 碳纳米管 ; 分散 ; 水泥浆体 ; 微观结构
- 英文论文关键词：graphene oxide ; carbon nanotubes ; dispersion ; cement paste ; microstructure
- 会议召开时间：2016-12-16
- 会议录名称：中国硅酸盐学会水泥分会第六届学术年会论文摘要集
- 语种：中文
- 分类号：TQ172.1;TB332
- 学会代码：EUGQ
- 会议名称：中国硅酸盐学会水泥分会第六届学术年会
- 会议地点：中国江苏盐城
- 主办单位：中国硅酸盐学会水泥分会
- 学会名称：中国硅酸盐学会
- 页数：2
- 文件大小：69k
- 原文格式：O
- 会议级别：全国
摘要
碳纳米管(CNTs)突出的力学性能使它们在水泥基复合材料中得以应用。然而,由于碳纳米管之间的范德华力导致难以被均匀分散。本研究使用氧化石墨烯(GO)作为碳纳米管的分散剂以实现碳纳米管在水泥浆体中的分散。紫外-可见光谱和扫描电子显微镜的结果显示,氧化石墨烯可以实现碳纳米管在水溶液中的高度分散。再者,掺入有氧化石墨烯/碳纳米管(0.02wt%GO和0.04.wt%CNTs)的水泥浆体在养护28天后的抗压强度和抗折强度分别提高了23.9%和16.7%。扫描电子显微镜图像显示,掺入水泥浆体中的碳纳米管镶嵌在水泥水化产物中。此外,压汞法(MIP)结果表明掺有GO/CNTs的水泥浆体的孔隙率减少。
The prominent mechanical properties of carbon nanotubes(CNTs) make them to be potential candidates for enhancing cementitious material.However,CNTs are hard to be dispersed uniformly due to the Vander Waals' force between them.Many methods have been attempted by researchers to improve the dispersion of CNTs.This research investigated the use of Graphene oxide(GO) as a dispersant for CNTs to overcome the obstacles.UV-vis spectroscopy and scanning electron microscopy(SEM) results revealed that CNTs were highly dispersed by GO rather than by surfactants.More importantly,the excellent reinforcing capabilities of the hybrid GO/CNTs were demonstrated by the enhanced fracture resistance properties of the cementitious matrix.The hybrid GO/CNTs(0.02wt%GO and 0.04wt%CNTs by weight of cement) with poly-carboxylate superplasticizer had a great contribution to improving the compressive and flexural strength of cement paste by 23.9%and 16.7%,respectively,which was higher than cement paste reinforced by CNTs or GO.Scanning electron microscopy images showed that the hybrid GO/CNTs were well dispersed in the cement hydration products.Furthermore,mercury intrusion porosimetry(MIP) results indicated that the addition of the GO/CNTs promoted the refinement of pores in cement paste.
The prominent mechanical properties of carbon nanotubes(CNTs) make them to be potential candidates for enhancing cementitious material.However,CNTs are hard to be dispersed uniformly due to the Vander Waals' force between them.Many methods have been attempted by researchers to improve the dispersion of CNTs.This research investigated the use of Graphene oxide(GO) as a dispersant for CNTs to overcome the obstacles.UV-vis spectroscopy and scanning electron microscopy(SEM) results revealed that CNTs were highly dispersed by GO rather than by surfactants.More importantly,the excellent reinforcing capabilities of the hybrid GO/CNTs were demonstrated by the enhanced fracture resistance properties of the cementitious matrix.The hybrid GO/CNTs(0.02wt%GO and 0.04wt%CNTs by weight of cement) with poly-carboxylate superplasticizer had a great contribution to improving the compressive and flexural strength of cement paste by 23.9%and 16.7%,respectively,which was higher than cement paste reinforced by CNTs or GO.Scanning electron microscopy images showed that the hybrid GO/CNTs were well dispersed in the cement hydration products.Furthermore,mercury intrusion porosimetry(MIP) results indicated that the addition of the GO/CNTs promoted the refinement of pores in cement paste.
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