协同效应对复配体系表面化学性能及聚集体的影响

doi:10.3969/j.issn.1001-1803.2020.08.001

Abstract

Abstract:

The mixture of sodium N-lauroyl glutamate （SLG） and dodecyltrimethylammonium chloride （DTAC） and the mixture of SLG and dodecyl betaine （BS-12） in different ratios were studied to investigate the effects of the interactions between different types of surfactants on surface chemical properties and micelle formation. The surface chemical properties of the mixed systems with different molar ratios were investigated by regular solution theory. Laser light scattering was used to characterize the micelle distribution and average hydrodynamic radius of the mixed systems. Fluorescence probing method was used to measure micropolarity and micellar aggregation number. The results indicated that both the mixed systems showed synergy of overall enhancement. The two systems showed the best synergy when x （SLG） =50%, and the interaction between anionic and cationic surfactants was stronger. The SLG/DTAC system tended to produce single stable aggregates at a concentration of ten times cmc, but the size after mixing was smaller than that of single components. The SLG/BS-12 system formed rod-shaped micelles at a concentration of ten times cmc, and the micelle size distribution was wide.

Key words: sodium N-lauroyl glutamate, surface chemical property, mean hydrodynamic radius, micropolarity, micellar aggregation number

CLC Number:

TQ423

HE Bin-bin,SHEN Jun,XU Hu-jun,WANG Wen-xuan. Effects of synergy on the surface activities and aggregates of surfactant mixtures[J].China Surfactant Detergent & Cosmetics, 2020, 50(8): 509-515.

Figures/Tables 12

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References 22

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x	cmc/ （mol·L^-1）	γ_cmc/ （mN·m^-1）	pc₂₀	cmc/c₂₀	Γ_max×10¹⁰/ （mol·cm^-2）	A_min/nm²	A_ideal,min/nm²
0	8.13×10^-3	35.1	2.77	4.78	3.63	0.46	0.46
10%	8.71×10^-4	26.08	3.67	4.07	6.38	0.26	0.43
30%	7.76×10^-4	25.5	3.88	5.88	6.27	0.31	0.40
50%	5.75×10^-4	23.45	3.81	3.71	7.74	0.21	0.38
70%	5.81×10^-4	24.15	3.96	5.11	6.21	0.27	0.37
90%	6.45×10^-4	24.7	3.86	4.67	6.37	0.26	0.35
100%	1.26×10^-3	32.6	3.53	4.27	5.63	0.3	0.3

x	cmc/ （mol·L^-1）	γ_cmc/ （mN·m^-1）	pc₂₀	cmc/c₂₀	Γ_max×10¹⁰/ （mol·cm^-2）	A_min/nm²	A_ideal,min/nm²
0	1.02×10^-3	31.2	3.81	6.44	4.12	0.39	0.39
10%	8.91×10^-4	27.3	3.75	5.01	5.47	0.3	0.37
30%	7.08×10^-4	26.3	3.8	4.47	5.98	0.28	0.36
50%	6.03×10^-4	25.55	3.93	5.13	6.24	0.27	0.35
70%	6.92×10^-4	25.7	3.74	3.8	7.0	0.24	0.34
90%	8.71×10^-4	26.4	3.69	4.27	6.32	0.26	0.33
100%	1.26×10^-3	32.6	3.53	4.27	5.63	0.3	0.3

x	x₁^m	β ^m	$\left\| \ln \frac{c_{1}^{m}}{c_{2}^{m}} \right\|$	x₁^σ	β^σ	$\left\| \ln \frac{c_{1}^{0}}{c_{2}^{0}} \right\|$	β^σ-β ^m	$\left\| \ln \frac{(c_{1}^{0}/c_{2}^{0})}{(c_{1}^{m}/c_{2}^{m})} \right\|$
10%	0.48	-7.17	1.86	0.5	-7.82	2.14	-0.65	0.28
30%	0.56	-5.73	1.86	0.57	-7.58	2.14	-1.85	0.28
50%	0.72	-7.16	1.86	0.72	-7.74	2.14	-0.58	0.28
70%	0.66	-6.48	1.86	0.65	-7.47	2.14	-0.99	0.28
90%	0.62	-6.12	1.86	0.62	-7.24	2.14	-1.12	0.28

x	x₁^m	β ^m	$\left\| \ln \frac{c_{1}^{m}}{c_{2}^{m}} \right\|$	x₁^σ	β^σ	$\left\| \ln \frac{c_{1}^{0}}{c_{2}^{0}} \right\|$	β^σ-β ^m	$\left\| \ln \frac{(c_{1}^{0}/c_{2}^{0})}{(c_{1}^{m}/c_{2}^{m})} \right\|$
10%	0.18	-1.39	0.21	0.20	-1.77	0.25	-0.38	0.04
30%	0.37	-1.98	0.21	0.37	-2.15	0.25	-0.17	0.04
50%	0.48	-2.57	0.21	0.48	-2.92	0.25	-0.35	0.04
70%	0.58	-2.33	0.21	0.59	-2.41	0.25	-0.08	0.04
90%	0.73	-2.19	0.21	0.72	-2.42	0.25	-0.23	0.04

Effects of synergy on the surface activities and aggregates of surfactant mixtures

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