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Abstract
Several environmentally acceptable non-ionic gemini surfactants are synthesized in this work using natural sources, including polyethenoxy di-dodecanoate (GSC12), polyethenoxy di-hexadecanoate (GSC16), and polyethenoxy di-octadecenoate (GSC18). The produced surfactants are confirmed by spectrum studies using FT-IR, 1HNMR, and 13CNMR. It explored and examined how the length of the hydrocarbon chain affected essential properties like foaming and emulsifying abilities. Surface tension examinations are used to assess the surface activity of the examined gemini surfactants. The lower value of critical micelle concentrations (0.381 × 10−4M) is detected for GSC18. Their spontaneous character is shown by the negative values of the free energy of adsorption (ΔGads) and micellization (ΔGmic) which arranged in the order GSC18 > GSC16 > GSC12. Based on theoretical, weight loss, and electrochemical investigations, these novel surfactants were investigated for their possible use in inhibiting carbon steel from corroding in 1 M HCl. Measuring results show that GSC18 inhibits corrosion in carbon steel by 95.4%. The isotherm of adsorption evaluated for the investigated inhibitors and their behavior obeys Langmuir isotherm.
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1 Egyptian Petroleum Research Institute (EPRI), Nasr City, Egypt (GRID:grid.454081.c) (ISNI:0000 0001 2159 1055)
2 Zagazig University, Chemistry Department, Faculty of Science, Zagazig, Egypt (GRID:grid.31451.32) (ISNI:0000 0001 2158 2757)
3 King Khalid University, Department of Chemistry, College of Science, Abha, Saudi Arabia (GRID:grid.412144.6) (ISNI:0000 0004 1790 7100)
4 Benha University, Chemistry Department, Faculty of Science, Benha, Egypt (GRID:grid.411660.4) (ISNI:0000 0004 0621 2741)