通过简单的雾化方法在水泥基复合材料中实现纳米石墨烯的单层分散,并获得极佳的强度增益

IF 9.9 2区 材料科学 Q1 Engineering
Nanxi Dang , Rijiao Yang , Chengji Xu , Yu Peng , Qiang Zeng , Weijian Zhao , Zhidong Zhang
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引用次数: 0

摘要

碳纳米添加剂(CNAs)是实现功能化复合材料独特性能的关键,然而,控制 CNAs 在材料基体中的分散始终是一项具有挑战性的任务。本研究成功开发了一种简单的雾化方法来提高石墨烯纳米片(GNPs)在水泥复合材料中的分散效率。这种雾化方法可与直接、间接和组合式超声波搅拌器集成到自制的自动搅拌-雾化装置中。采用不同的搅拌和混合方法,对掺有 GNPs 的硬化水泥浆进行了机械和微观结构测试。结果表明,直接超声波搅拌能使粒径较小的 GNP 颗粒在较长时间内更均匀地分散。平均粒径为 100 μm 的雾化液滴在很大程度上减少了 GNPs 的团聚。在水泥基质中观察到单层 GNPs,其强度提高了 54%,而在 GNPs 用量为 0.3 wt% 时,总孔隙率降低了 21%。GNPs 在水泥中的分散效率大大提高,同时也提高了水泥的水化程度。该研究为在工程材料中分散 CNAs 提供了一种有效且节省人力的技术,具有广阔的工业化前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A simple atomization approach enables monolayer dispersion of nano graphenes in cementitious composites with excellent strength gains

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 ∼100 ​μm 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.

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来源期刊
Nano Materials Science
Nano Materials Science Engineering-Mechanics of Materials
CiteScore
20.90
自引率
3.00%
发文量
294
审稿时长
9 weeks
期刊介绍: Nano Materials Science (NMS) is an international and interdisciplinary, open access, scholarly journal. NMS publishes peer-reviewed original articles and reviews on nanoscale material science and nanometer devices, with topics encompassing preparation and processing; high-throughput characterization; material performance evaluation and application of material characteristics such as the microstructure and properties of one-dimensional, two-dimensional, and three-dimensional nanostructured and nanofunctional materials; design, preparation, and processing techniques; and performance evaluation technology and nanometer device applications.
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