The Egyptian oil and gas industry is suffering from severe metal corrosion problems, particularly microbial‐induced corrosion. There is limited knowledge on the corrosion inhibition of carbon steels in the presence of an acidophilic, iron‐oxidizing bacterial species Acidithiobacillus ferrooxidans. Therefore, in this study, novel Gemini cationic surfactants, in three forms depending on variation in alkyl chains of 8, 12, and 16 carbon atoms named FHPAO, FHPAD, and FHPAH, respectively, were synthesized and characterized by Fourier transform infrared and nuclear magnetic resonance spectroscopy. The surface parameters and the thermodynamic of the synthesized surfactants were evaluated at three different temperatures, 20, 40, and 60 °C. The synthesized Gemini cationic surfactants were tested as broad‐spectrum antimicrobial, antibacterial and anticandida agents. They evaluated as biocides and corrosion inhibitors against Acidithiobacillus ferrooxidans. FHPAD showed higher adsorption ability at the solution interface and higher affinity to construct micelles than FHPAO and FHPAH. Both adsorption and micellization processes were hydrophobic and temperature dependent. FHPAO, FHPAD and FHPAH exhibited wide‐spectrum antimicrobial activities, and the highest activity and the lowest minimum bactericidal/fungicidal inhibitory concentrations were attributed to FHPAD. Furthermore, synthesized FHPAD demonstrated the highest metal corrosion inhibition efficiency of 95.5% at 5 mM in comparison to 87.5% and 81.7% for FHPAO and FHPAH, respectively. In conclusion, this study provides novel synthesized cationic surfactants with many applications in the oil and gas industry, such as broad‐spectrum antimicrobial, biocides, and corrosion inhibitors for acidophilic, iron‐oxidizing bacterial species Acidithiobacillus ferrooxidans.

中文翻译：

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新型双子座阳离子表面活性剂：对酸性铁硫氧化铁细菌的热力学，抗菌敏感性和缓蚀性能

埃及的石油和天然气工业正遭受严重的金属腐蚀问题，尤其是微生物引起的腐蚀。在嗜酸，铁氧化细菌物种酸性铁硫氧化铁细菌存在下对碳钢的腐蚀抑制作用的认识有限。因此，在这项研究中，合成了新颖的Gemini阳离子表面活性剂，三种形式取决于8、12和16个碳原子的烷基链的变化，分别命名为FHPAO，FHPAD和FHPAH，并通过傅里叶变换红外和核磁进行了表征共振光谱。在三个不同的温度（20、40和60°C）下评估了合成表面活性剂的表面参数和热力学。合成的Gemini阳离子表面活性剂已作为广谱抗菌剂，抗菌剂和防霉剂进行了测试。他们被评估为抗铁氧酸酸性硫杆菌的杀生物剂和腐蚀抑制剂。与FHPAO和FHPAH相比，FHPAD在溶液界面处表现出更高的吸附能力和对胶束的亲和力。吸附和胶束化过程都是疏水性的，并且与温度有关。FHPAO，FHPAD和FHPAH表现出广谱抗菌活性，而最高活性和最低最低最低杀菌/杀真菌抑制浓度归因于FHPAD。此外，合成的FHPAD在5 mM时具有最高的金属腐蚀抑制效率，为95.5％，而FHPAO和FHPAH分别为87.5％和81.7％。总之，本研究提供了新颖的合成阳离子表面活性剂，在石油和天然气工业中具有许多应用，例如广谱抗菌剂，杀生物剂和嗜酸，铁氧化细菌物种的缓蚀剂酸性硫杆菌铁氧体。