Studies on Surfactant鈥揑onic Liquid Interaction on Clouding Behaviour and Evaluation of Thermodynamic Parameters
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- 作者：Darshak Bhatt (1)
Kalpana C. Maheria (1)
Jigisha Parikh (2) - 关键词：Cloud point ; Ethoxylated octylphenols ; Ethoxylated sorbitan esters ; Ethoxylated cetyl alcohol ; Tetraethyl ammonium tetrafluoroborate ; Thermodynamic parameters
- 刊名：Journal of Surfactants and Detergents
- 出版年：2013
- 出版时间：July 2013
- 年：2013
- 卷：16
- 期：4
- 页码：547-557
- 全文大小：343KB
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Kalpana C. Maheria (1)
Jigisha Parikh (2)
1. Applied Chemistry Department, Sardar Vallabhbhai National Institute of Technology, Surat, 395007, Gujarat, India
2. Chemical Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat, 395007, Gujarat, India - ISSN：1558-9293
文摘
The present study investigates the effect of tetraethyl ammonium tetrafluoroborate [TEA(BF4)] ionic liquid (IL) on the cloud point (CP) of the following nonionic surfactants in aqueous solution: ter-octylphenol ethoxylates with 9.5 and 4.5 ethylene oxide groups (abbreviated TOPEO9.5 and TOPEO4.5, respectively), cetyl alcohol ethoxylate with 10 ethylene oxide groups (C16EO10), and sorbitan monolaurate and monooleate both with 20 ethylene oxide groups (SMLEO20 and SMOEO20, respectively) in aqueous solutions. The thermodynamic parameters of these mixtures were calculated at different IL concentrations. The CP of most of the tested nonionic surfactants increased with the increment of IL concentrations with the exception of C16EO10 for which it decreased. The solubility of a nonionic surfactant containing polyoxyethylene (POE) hydrophilic chain was considered as maximum at the CP, hence the thermodynamic parameters were calculated at the same temperature. The results showed that the standard Gibbs free energy (鈭?em class="a-plus-plus">G CP 0 ), the enthalpy (鈭?em class="a-plus-plus">H CP 0 ) and the entropy (鈭?em class="a-plus-plus">S CP 0 ) of the clouding phenomenon were found to be positive for ethoxylated octylphenol and sorbitan esters, whereas 鈭?em class="a-plus-plus">H CP 0 and 鈭?em class="a-plus-plus">S CP 0 were found to be negative for C16EO10. It was found that the overall clouding process is endothermic for ethoxylated octylphenol and sorbitan esters and exothermic for C16EO10. For all the studied systems, 鈭?em class="a-plus-plus">H CP 0 聽>聽T鈭?em class="a-plus-plus">S CP 0 indicated that the process of clouding is guided by both enthalpy and entropy. The positive value of standard Gibbs free energy (鈭?em class="a-plus-plus">G CP 0 ) for the all mixed systems indicated that the process proceeds non-spontaneously. The 鈭?em class="a-plus-plus">G CP 0 decreased with increasing IL concentration for all the nonionic surfactants; however, it decreased with increasing surfactant concentration for TOPEO9.5, C16EO10, and SMOEO20, and increased with increasing surfactant concentration for TOPEO9.5 and SMLEO20.