咪唑离子液体与辛烷磺酸钠复配体系的聚集行为

doi:10.3969/j.issn.2097-2806.2024.08.002

Abstract

Abstract:

Two mixed systems consisting of an anionic surfactant and a cationic surface-active ionic liquid were studied. The mixture of sodium octanesulfonate （SOS） and 1-decyl-3-methylimidazolium bromide （[C₁₀mim]Br）, and the mixture of SOS and 1-tetradecyl-3-methylimidazolium bromide （[C₁₄mim]Br）, were both investigated using surface tension measurement. The parameters, such as critical micelle concentration （cmc）, surface tension at cmc （γ_cmc）, surface pressure at cmc （Π_cmc）, maximum surface excess （Γ_max） and minimum area per molecule （A_min）, were obtained. The mixed micellar parameters including micellar mole fraction （X₁^m）, micellar interaction parameters （β^m） and activity coefficients （f₁^m and f₂^m） were calculated by applying Rubingh’s regular solution theory. The calculated parameters confirmed that there were strong synergy in all these mixed systems, and the interaction of SOS with [C₁₄mim]Br was stronger than that with [C₁₀mim]Br. Thermodynamic parameters for mixed monolayers and mixed micelles were calculated and discussed, which indicated that the mixed micelles were spontaneously formed and were thermodynamically stable systems. Turbidity measurement was conducted using spectrophotometry. The phase diagrams were plotted for each system based on visual observations and absorbance values. The mixed systems of SOS/[C₁₀mim]Br and SOS/[C₁₄mim]Br all exhibited three concentration regions: a low-concentration homogeneous solution region, a two-phase region, and a high-concentration homogeneous solution region.

Key words: surface-active ionic liquid, mixed micelle, aggregation behavior, synergism

CLC Number:

TQ423

Xueyan Zhao,Jingyi Huang,Ruijie Xiao,Guirong Cao. Aggregation behavior of mixed systems of imidazolium-based ionic liquid and sodium octanesulfonate[J].China Surfactant Detergent & Cosmetics, 2024, 54(8): 887-894.

Figures/Tables 8

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References 29

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System	α_SOS	cmc/（mmol/L）	γ_cmc/（mN/m）	pc₂₀	Π_cmc/（mN/m）	Γ_max/（μmol/m²）	A_min/nm²
SOS/[C₁₀mim]Br	0	38.10	31.86	-0.73	40.14	1.80	0.92
	0.2	8.87	20.73	0.51	51.27	1.76	0.94
	0.4	6.60	19.81	0.46	52.19	2.01	0.82
	0.6	7.21	20.50	0.35	51.50	2.00	0.82
	0.8	9.70	21.26	0.44	50.74	1.76	0.94
	1.0	157.44	36.58	-1.59	35.42	2.05	0.81
SOS/[C₁₄mim]Br	0	1.92	37.22	0.44	34.78	1.75	0.95
	0.2	0.53	26.23	1.30	45.77	2.13	0.78
	0.4	0.51	25.88	1.36	46.12	2.20	0.75
	0.6	0.53	24.77	1.40	47.23	1.96	0.85
	0.8	0.63	25.33	1.24	46.67	2.06	0.81
	1.0	157.44	36.58	-1.59	35.42	2.05	0.81

System	α_SOS	cmc/（mmol/L）		X₁^m	β^m	f₁^m	f₂^m	X₁⁰	β^σ
System	α_SOS	C^m_Expm	C^m_Theor	X₁^m	β^m	f₁^m	f₂^m	X₁⁰	β^σ
SOS/[C₁₀mim]Br	0.2	8.87	8.79	0.37	-8.90	0.029	0.30	0.39	-13.69
	0.4	6.60	6.48	0.42	-9.75	0.038	0.18	0.42	-13.82
	0.6	7.21	7.11	0.45	-9.58	0.058	0.14	0.45	-13.83
	0.8	9.7	9.68	0.50	-9.14	0.10	0.10	0.48	-14.33
SOS/[C₁₄mim]Br	0.2	0.53	0.51	0.30	-12.82	0.001 9	0.32	0.35	-17.07
	0.4	0.51	0.54	0.34	-12.29	0.004 7	0.24	0.37	-16.74
	0.6	0.53	0.48	0.37	-13.44	0.004 8	0.16	0.39	-17.11
	0.8	0.63	0.59	0.40	-13.83	0.006 9	0.11	0.42	-17.49

System	α_SOS	$\Delta G_{\mathrm{mic}}^{\ominus}$ / （kJ/mol）	$\Delta G_{\mathrm{ad}}^{\ominus}$ / （kJ/mol）	G_min/ （kJ/mol）	?G_ex/ （kJ/mol）
SOS/[C₁₀mim]Br	0	-18.5	-40.8	17.65	—
	0.2	-21.66	-50.79	11.73	-5.13
	0.4	-22.40	-48.36	9.78	-5.87
	0.6	-22.18	-47.93	10.12	-5.86
	0.8	-21.44	-50.27	12.03	-5.86
	1.0	-14.53	-31.81	17.84	—
SOS/[C₁₄mim]Br	0	-25.46	-45.33	21.29	—
	0.2	-28.65	-50.14	12.32	-6.64
	0.4	-28.74	-49.70	11.69	-6.85
	0.6	-28.65	-52.75	12.68	-7.76
	0.8	-28.22	-50.88	12.36	-8.22
	1.0	-14.53	-31.81	17.84	—

Aggregation behavior of mixed systems of imidazolium-based ionic liquid and sodium octanesulfonate

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