Surface Treatment of Carbon Nanotubes Using Modified Tapioca Starch for Improved Force Detection Consistency in Smart Cementitious Materials
Surface Treatment of Carbon Nanotubes Using Modified Tapioca Starch for Improved Force Detection Consistency in Smart Cementitious Materials
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DOI：
10.3390/s20143985
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发表时间：
2020-07-01
期刊：
影响因子：
3.9
通讯作者：
Bezbaruah, Achintya N.
中科院分区：
文献类型：
--
作者：
Chia, Leonard;Blazanin, Gina;Bezbaruah, Achintya N.
碳纳米管（CNT）的显着的机械性能和压电响应，使这组纳米材料的智能胶凝材料中使用的理想候选人，以监测力和相应的土木结构的结构健康状况。然而，测量的不一致性是碳纳米管使智能胶凝材料被广泛应用于力检测的主要挑战。在这项研究中，改性木薯淀粉共聚物被引入到表面处理的碳纳米管的碳纳米管更好的分散，从而减少碳纳米管改性的智能胶凝材料的力测量的不一致性。水泥砂浆裸（未改性）碳纳米管（直接混合法）和表面活性剂处理的碳纳米管使用十二烷基苯磺酸钠（NaDDBS）作为对照。实验结果表明，当与裸碳纳米管制成的样品相比，由改性木薯淀粉共聚物包覆的碳纳米管（CCNTs）制成的样品显示出更高的动态载荷诱导的压电响应与显着改善的一致性和更小的滞后在胶凝材料。当与表面活性剂方法制备的样品相比，由开发的CCNTs制成的样品表现出轻微增加的力检测灵敏度，具有显着提高的一致性，在压电响应和只有轻微的滞后，表明增强的分散效果。这种新的碳纳米管表面涂覆方法可以很容易地扩大规模，以满足未来智能水泥材料广泛应用的潜在工业需求。
The remarkable mechanical properties and piezo-responses of carbon nanotubes (CNT) makes this group of nanomaterials an ideal candidate for use in smart cementitious materials to monitor forces and the corresponding structural health conditions of civil structures. However, the inconsistency in measurements is the major challenge of CNT-enabled smart cementitious materials to be widely applied for force detection. In this study, the modified tapioca starch co-polymer is introduced to surface treat the CNTs for a better dispersion of CNTs; thus, to reduce the inconsistency of force measurements of the CNTs modified smart cementitious materials. Cement mortar with bare (unmodified) CNTs (direct mixing method) and surfactant surface treated CNTs using sodium dodecyl benzenesulfonate (NaDDBS) were used as the control. The experimental results showed that when compared with samples made from bare CNTs, the samples made by modified tapioca starch co-polymer coated CNTs (CCNTs) showed higher dynamic load induced piezo-responses with significantly improved consistency and less hysteresis in the cementitious materials. When compared with the samples prepared with the surfactant method, the samples made by the developed CCNTs showed slightly increased force detection sensitivity with significantly improved consistency in piezo-response and only minor hysteresis, indicating enhanced dispersion effectiveness. The new CNT surface coating method can be scaled up easily to cater the potential industry needs for future wide application of smart cementitious materials.