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CORROSION SCIENCE · 2022 · IF 7.72

Synergistic corrosion inhibition effects of quaternary ammonium salt cationic surfactants and thiourea on Q235 steel in sulfuric acid: Experimental and theoretical research

Tianyu Zheng,Jinyan Liu,Meihui Wang,Qian Liu,Jia Wang,Yao Chong,Guixiao Jia

The corrosion resistance of Q235 steel treated with pure thiourea, dodecyl trimethyl ammonium bromide (DTAB), dodecyl dimethyl benzyl ammonium bromide (DDBAB), and their mixture (i.e. DTAB-Thiourea, DDBAB-Thiourea) in sulfuric acid was studied. Results showed that DTAB-Thiourea and DDBAB-Thiourea have strong synergistic effects (4.86 and 5.99) and could inhibit corrosion by 93.37% and 94.98%, respectively. These effects are attributed to a decrease in the steric hindrance due to changes in the molecular adsorption mode of the corrosion inhibitors . The adsorption forms of all inhibitors on the steel surface were investigated and explained using density functional theory.

研究领域: 材料科学 · 电化学 · 理论化学

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JOURNAL OF MOLECULAR STRUCTURE · 2023 · IF 3.8

Thiourea-cyanostilbene derivative: An effective fluorescent sensor for Pd2+ in aqueous media

Pan He,Xianyu Huang,Pingting Zhuang,Hongyu Guo,Fafu Yang

Although some Pd 2+ sensors were presented, the in-situ and real-time examination of Pd 2+ based on fluorescent sensor is still a challenging task. In this work, a novel thiourea-cyanostilbene derivative ( TCS ) was designed and synthesized as the effective fluorescent sensor on in-situ and real-time sensing Pd 2+ in aqueous media. TCS possessed good AIE fluorescence in THF/H 2 O solution. The fluorescence was selectively quenched by Pd 2+ among all kinds of metallic ions . The sensing mechanism of 1:1 stoichiometry ratio for TCS with Pd 2+ was confirmed by Job's plot, 1 H NMR and MS spectra. The detection limit was as low as 4.32 × 10 −8 M. TCS exhibited the good sensing application for Pd 2+ in tested paper and simulated samples with low errors. TCS had the excellent fluorescence imaging performance in living cells with the fluorescence imaging response on Pd 2+ . This research not only reported an effective fluorescence sensor for Pd 2+ , but also suggested the good application prospect on in-situ and real-time sensing Pd 2+ in complicated environment.

研究领域: 分析化学 · 材料科学 · 生物医学工程

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Synergistic corrosion inhibition effects of quaternary ammonium salt cationic surfactants and thiourea on Q235 steel in sulfuric acid: Experimental and theoretical research

Thiourea-cyanostilbene derivative: An effective fluorescent sensor for Pd2+ in aqueous media