O'Rear Edgar A, Onthong Suthisa, Pongprayoon Thirawudh
School of Sustainable Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK 73019, USA.
Institute for Applied Surfactant Research, University of Oklahoma, Norman, OK 73019, USA.
Nanomaterials (Basel). 2023 Dec 27;14(1):80. doi: 10.3390/nano14010080.
The incorporation of carbon nanotubes into cementitious composites increases their compressive and flexural strength, as well as their electrical and thermal conductivity. Multiwalled carbon nanotubes (MWCNTs) covalently functionalized with hydroxyl and carboxyl moieties are thought to offer superior performance over bare nanotubes, based on the chemistry of cement binder and nanotubes. Anionic carboxylate can bind to cationic calcium in the hydration products, while hydroxyl groups participate in hydrogen bonding to anionic and nonionic oxygen atoms. Results in the literature for mechanical properties vary widely for both bare and modified filler, so any added benefits with functionalization are not clearly evident. This mini-review seeks to resolve the issue using an analysis of reports where direct comparisons of cementitious composites with plain and functionalized nanotubes were made at the same concentrations, with the same methods of preparation and under the same conditions of testing. A focus on observations related to the mechanisms underlying the enhancement of mechanical strength and conductivity helps to clarify the benefits of using functionalized MWCNTs.
将碳纳米管掺入水泥基复合材料中可提高其抗压强度和抗弯强度，以及其导电性和导热性。基于水泥基粘结剂和纳米管的化学性质，用羟基和羧基部分共价官能化的多壁碳纳米管（MWCNT）被认为比裸露的纳米管具有更优异的性能。阴离子羧酸盐可与水合产物中的阳离子钙结合，而羟基则参与与阴离子和非离子氧原子的氢键形成。文献中关于裸露填料和改性填料的力学性能结果差异很大，因此功能化带来的任何额外益处并不明显。本综述旨在通过分析报告来解决这个问题，这些报告对相同浓度、相同制备方法和相同测试条件下的普通纳米管和功能化纳米管水泥基复合材料进行了直接比较。关注与机械强度和导电性增强背后的机制相关的观察结果有助于阐明使用功能化MWCNT的益处。
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