Micellization behavior and thermodynamic properties of cetyltrimethylammonium bromide in lithium chloride, potassium chloride, magnesium chloride and calcium chloride solutions

doi:10.1016/j.cjche.2024.12.019

中国化学工程学报 ›› 2025, Vol. 81 ›› Issue (5): 95-104.DOI: 10.1016/j.cjche.2024.12.019

Micellization behavior and thermodynamic properties of cetyltrimethylammonium bromide in lithium chloride, potassium chloride, magnesium chloride and calcium chloride solutions

Wenting Cheng, Qianqian Li, Ying Zhai, Huaigang Cheng, Fangqin Cheng

Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, China

收稿日期:2024-09-05 修回日期:2024-12-16 接受日期:2024-12-24 出版日期:2025-05-28 发布日期:2025-03-11
通讯作者: Wenting Cheng,E-mail:wtcheng@sxu.edu.cn
基金资助:
The support of National Natural Science Foundation of China (22208198 and 22478232) is gratefully acknowledged.

Micellization behavior and thermodynamic properties of cetyltrimethylammonium bromide in lithium chloride, potassium chloride, magnesium chloride and calcium chloride solutions

Wenting Cheng, Qianqian Li, Ying Zhai, Huaigang Cheng, Fangqin Cheng

Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, China

Received:2024-09-05 Revised:2024-12-16 Accepted:2024-12-24 Online:2025-05-28 Published:2025-03-11
Contact: Wenting Cheng,E-mail:wtcheng@sxu.edu.cn
Supported by:
The support of National Natural Science Foundation of China (22208198 and 22478232) is gratefully acknowledged.

摘要/Abstract

摘要： The micellization behavior and thermodynamic properties of cetyltrimethylammonium bromide (CTAB) in single lithium chloride (LiCl), potassium chloride (KCl), magnesium chloride (MgCl₂) and calcium chloride (CaCl₂) solutions were investigated at 288.15-318.15 K. Result showed that the critical micelle concentration (CMC) values of CTAB in all solutions decreased to a minimum value around 298.15 K and then increased with further increasing the temperature. In all cases, the CMC values decreased with increasing salt concentration at each temperature. Additionally, the introduction of any single salt resulted in a reduction of CMC values for CTAB, attributed to the combined effects of counterions and entropy-driven interactions. The observed trend for CMC values was as follows: CMC_H₂O > CMC_KCl > CMC_LiCl > CMC_CaCl₂ > CMC_MgCl₂. Furthermore, standard thermodynamic parameters, including standard free energy of micellization (△G_m⁰), standard enthalpy of micellization (△H_m⁰) and standard entropy of micellization (△S_m⁰), were calculated based on the obtained CMC values. The negative values of △G_m⁰ indicated that the formation of CTAB micelles was a spontaneous behavior. The variations in △H_m⁰ and △S_m⁰ suggested that micellization was primarily entropy-driven at temperatures between 288.15 and 298.15 K, while it was influenced by both entropy and enthalpy from 298.15 to 318.15 K. Fourier transform infrared spectroscopy (FTIR) and transmission electron microscope (TEM) were employed to further explore the effects of salts on the micellization behavior of CTAB.

关键词: Surfactants, Solution, Thermodynamic properties, Micellization behavior

Abstract: The micellization behavior and thermodynamic properties of cetyltrimethylammonium bromide (CTAB) in single lithium chloride (LiCl), potassium chloride (KCl), magnesium chloride (MgCl₂) and calcium chloride (CaCl₂) solutions were investigated at 288.15-318.15 K. Result showed that the critical micelle concentration (CMC) values of CTAB in all solutions decreased to a minimum value around 298.15 K and then increased with further increasing the temperature. In all cases, the CMC values decreased with increasing salt concentration at each temperature. Additionally, the introduction of any single salt resulted in a reduction of CMC values for CTAB, attributed to the combined effects of counterions and entropy-driven interactions. The observed trend for CMC values was as follows: CMC_H₂O > CMC_KCl > CMC_LiCl > CMC_CaCl₂ > CMC_MgCl₂. Furthermore, standard thermodynamic parameters, including standard free energy of micellization (△G_m⁰), standard enthalpy of micellization (△H_m⁰) and standard entropy of micellization (△S_m⁰), were calculated based on the obtained CMC values. The negative values of △G_m⁰ indicated that the formation of CTAB micelles was a spontaneous behavior. The variations in △H_m⁰ and △S_m⁰ suggested that micellization was primarily entropy-driven at temperatures between 288.15 and 298.15 K, while it was influenced by both entropy and enthalpy from 298.15 to 318.15 K. Fourier transform infrared spectroscopy (FTIR) and transmission electron microscope (TEM) were employed to further explore the effects of salts on the micellization behavior of CTAB.

Key words: Surfactants, Solution, Thermodynamic properties, Micellization behavior

Wenting Cheng, Qianqian Li, Ying Zhai, Huaigang Cheng, Fangqin Cheng. Micellization behavior and thermodynamic properties of cetyltrimethylammonium bromide in lithium chloride, potassium chloride, magnesium chloride and calcium chloride solutions[J]. 中国化学工程学报, 2025, 81(5): 95-104.

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Micellization behavior and thermodynamic properties of cetyltrimethylammonium bromide in lithium chloride, potassium chloride, magnesium chloride and calcium chloride solutions

Micellization behavior and thermodynamic properties of cetyltrimethylammonium bromide in lithium chloride, potassium chloride, magnesium chloride and calcium chloride solutions

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