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- Title
Preparation and properties of a novel surfactant constructed by electrostatic interactions.
- Authors
Junhui Wu; Ting Pan; Xiaomei Pei; Zhenggang Cui
- Abstract
Taking stearic acid as the raw material, N-(2-(dimethylamino) ethyl) stearamide (C18N2N) was synthesized. A new surfactant was prepared by mixing C18N2N and cinnamic acid(TA) with fixed ratio. This surfactant was formed by noncovalent electrostatic interactions, which avoided complicated synthetic procedures. The surface activity and rheological properties of the surfactant were investigated with a surface tensiometer and a rheometer. The critical micelle concentration(cmc) and the surface tension at cmc(γcmc) of the surfactant were 0.11 mmol/L and 32.4 mN/m, indicative of strong aggregation and adsorption ability. The maximum amount adsorbed(Γmax) and the minimum molecular area occupied(Amin) were 2.77 μmol/m² and 0.6 nm². Wormlike micelles were formed at the concentration of 25 mmol/L. When the concentration was over 100 mmol/L, the zero-shear viscosity(η0) abruptly increased and then reached the maximum value for the surfactant of C18N2N/TA containing 150 mmol/L TA. The solution viscosity was as high as 1 761.38 Pa·s. The effects of temperature on the rheological behavior were also considered. With the increase of temperature, the viscosity gradually increased. And when the temperature reached 40 ℃, η0 of the solution with the concentration of 100 mmol/L achieved the maximum value of 1 370.386 Pa·s. When the temperature continued to rise, η0 began to decrease with further increasing temperature. A remarkable viscosity of 305.55 Pa·s was still remained at 50 ℃. The viscoelastic solutions showed good temperature resistance and shear resistance. The surfactant solutions applied as the fracturing fluid were also investigated. This surfactant also showed excellent sand-carrying performance, and the settling rate of the sand was merely 0.26 cm/min. This surfactant could be simply prepared and showed excellent performance, which expanded the preparation and application field of novel surfactants.
- Subjects
ELECTROSTATIC interaction; SURFACE active agents; CRITICAL micelle concentration; SURFACE tension; CINNAMIC acid
- Publication
China Surfactant Detergent & Cosmetics (2097-2806), 2023, Vol 53, Issue 8, p865
- ISSN
2097-2806
- Publication type
Article
- DOI
10.3969/j.issn.2097-2806.2023.08.002