School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, JiangSu, People's Republic of China.
Nanotechnology. 2012 Dec 21;23(50):505705. doi: 10.1088/0957-4484/23/50/505705. Epub 2012 Nov 19.
The hollow mesoporous silica nanoparticles (HMSNs), which have been used as the nanocontainers for the corrosion inhibitor, benzotriazole, were fabricated using the hard-template method. Alkaline-responsive HMSNs based on cucurbit[6]uril (CB[6])/bisammonium supramolecular complex and acid-responsive HMSNs based on α-cyclodextrin (α-CD)/aniline supramolecular complex, which operate in water, have been achieved and characterized by solid-state NMR, thermogravimetry analysis, scanning electron microscopy, transmission electron microscopy and N(2) adsorption-desorption analysis. The two elaborately designed nanocontainers show the pH-controlled encapsulation/release behaviors for benzotriazole molecules. Equal amounts of the alkaline- and acid-responsive nanocontainers were uniformly distributed in the hybrid zirconia-silica sol-gel coating and thus formed the intelligent anticorrosion coating. The self-healing property of AA2024 alloy coated with the intelligent anticorrosion coating is evaluated by electrochemical impedance spectroscopy (EIS). The sol-gel coating doped with the pH-responsive nanocontainers clearly demonstrates long-term corrosion protection performances when compared to the undoped sol-gel coating, which is attributed to the release of corrosion inhibitor from the nanocontainers after feeling the changes of environmental pH values near the corroded areas.
采用硬模板法制备了作为缓蚀剂苯并三唑纳米容器的中空介孔硅纳米粒子（HMSNs）。通过固态 NMR、热重分析、扫描电子显微镜、透射电子显微镜和 N2 吸附-解吸分析，实现了基于葫芦[6]脲（CB[6]）/双铵超分子配合物的碱性响应 HMSNs 和基于 α-环糊精（α-CD）/苯胺超分子配合物的酸性响应 HMSNs，并对其进行了表征。这两种精心设计的纳米容器表现出对苯并三唑分子的 pH 控制的封装/释放行为。等量的碱性和酸性响应纳米容器均匀分布在混合氧化锆-硅溶胶-凝胶涂层中，从而形成了智能防腐涂层。通过电化学阻抗谱（EIS）评估了涂有智能防腐涂层的 AA2024 合金的自修复性能。与未掺杂溶胶-凝胶涂层相比，掺杂 pH 响应纳米容器的溶胶-凝胶涂层明显表现出长期的腐蚀防护性能，这归因于腐蚀抑制剂从纳米容器中释放出来，以应对腐蚀区域附近环境 pH 值的变化。
