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Synthesis, Surface and Thermodynamic Properties of Substituted Polytriethanolamine Nonionic Surfactants |
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| Authors: | Nabel A Negm Ahmed F El-Farargy Salah M Tawfik Ahmad M Abdelnour Hassan H Hefni Manal M Khowdiary |
| Affiliation: | 1. Petrochemicals Department, Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt 2. Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt 3. Khalda Petroleum Company, Cairo, Egypt |
| Abstract: | Three series of nonionic surfactants derived from polytriethanolamine containing 8, 10, and 12 units of triethanolamine were synthesized. Structural assignment of the different compounds was made on the basis of FTIR and 1H‐NMR spectroscopic data. The surface parameters of these surfactants included critical micelle concentration (CMC), surface tension at the CMC (γCMC), surfactant concentration required to reduce the surface tension of the solvent by 20 mN m?1 (pC20), maximum surface excess (Γmax), and the interfacial area occupied by the surfactant molecules (Amin) using surface tension measurements. The micellization and adsorption free energies were calculated at 25 °C. |
| Keywords: | Nonionic Surface tension Effectiveness Efficiency Surface pressure |
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