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Acta Physico-Chimica Sinca  2015, Vol. 31 Issue (12): 2324-2331    DOI: 10.3866/PKU.WHXB201510231
SOFT MATTER     
Interfacial Adsorption, Dilational Visco-Elasticity and Foam Stability in a Mixed System of Gemini Surfactant/C12En
Bing-Lei. SONG1,Zhao-Lan. ZHAI1,Jian-Xi. ZHAO2,*(),Guo-Jing. SUN2
1 The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, P. R. China
2 Institute of Colloid and Interface Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, P. R. China
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Abstract  

The mixed adsorption of a cationic gemini surfactant, ethanediyl-1, 2-bis(dodecyldimethylammonium bromide) 12-2-12), and a nonionic surfactant, polyoxyethylene mono-dodecyl ether (C12En, where n = 4, 10, 23) at the air/water interface was studied using surface tension measurements. The dilational viscoelastic properties of the films that formed at the air/water interface were examined using an interfacial rheology technique that was described using the Lucassen-van den Tempel (LVT) model. The values of the limit elasticity were fitted accordingly. Foams were generated by the mixed surfactant aqueous solutions and the stability of foams determined using the half-life. C12En exhibited attractive interactions towards 12-2-12 within the adsorption films. The average minimum area (Amin) of the adsorbed molecules decreased in the order: 12-2-12/C12E23 > 12-2-12/C12E10 > 12-2-12/C12E4, while the limit elasticity decreased in the reverse order: ε0, fit(12-2-12/C12E4) > ε0, fit(12-2-12/C12E10) > ε0, fit(12-2-12/C12E23) at a comparable concentration of the surfactant in the bulk. Compared with the film adsorbed by 12-2-12 alone, only 12-2-12/C12E4 form had denser structure. Thus, by adding the nonionic component C12E4, which contained a small hydrophilic head group, the interfacial elasticity of the 12-2-12 film increased significantly and the stability of the corresponding foams was effectively enhanced.



Key wordsMixed adsorption      Cationic gemini surfactant      Nonionic conventional surfactant      Interfacial elasticity      Foam stability     
Received: 19 August 2015      Published: 23 October 2015
MSC2000:  O647  
Fund:  the National Natural Science Foundation of China(21473032, 21273040)
Corresponding Authors: Jian-Xi. ZHAO     E-mail: jxzhao.colloid@fzu.edu.cn
Cite this article:

Bing-Lei. SONG,Zhao-Lan. ZHAI,Jian-Xi. ZHAO,Guo-Jing. SUN. Interfacial Adsorption, Dilational Visco-Elasticity and Foam Stability in a Mixed System of Gemini Surfactant/C12En. Acta Physico-Chimica Sinca, 2015, 31(12): 2324-2331.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201510231     OR     http://www.whxb.pku.edu.cn/Y2015/V31/I12/2324

 
System X1σ X2σ β σ
12-2-12/C12E4 0.276 0.724 –3.70
12-2-12/C12E10 0.215 0.785 –3.68
12-2-12/C12E23 0.198 0.802 –2.40
The subscripts 1 and 2 indicate 12-2-12 and C12En, respectively.
 
System cmc/(mmol·L–1) C20/(mmol·L–1) γcmc/(mN·m–1) 1010Γmax/(mol·cm–2) Amin/nm2
single component systems
12-2-12 0.810 0.1840 30.6 2.54 0.65
C12E4 0.054 0.0135 27.6 4.98 0.33
C12E10 0.058 0.0062 31.7 3.97 0.42
C12E23 0.060 0.0113 41.9 2.28 0.73
equal-mole (in bulk) mixtures
12-2-12/C12E4 0.058 0.0147 26.1 3.43 0.48
12-2-12/C12E10 0.059 0.0082 33.7 1.11 1.50
12-2-12/C12E23 0.085 0.0163 43.4 0.76 2.19
 
 
 
 
 
12-2-12/C12E4 12-2-12/C12E10 12-2-12/C12E23
CT/(mmol·L–1) ε0, fit/(mN·m–1) ω0, fit/s–1 CT/(mmol·L–1) ε0, fit/(mN·m–1) ω0, fit/s–1 CT/(mmol·L–1) ε0, fit/(mN·m–1) ω0, fit/s–1
0.02 33 0.02 0.02 30 0.07 0.02 16 0.16
0.03 41 0.03 0.03 36 0.09 0.03 18 0.20
0.07 62 0.15 0.05 43 0.17 0.05 21 0.21
0.10 55 0.19 0.08 40 0.23 0.08 16 0.36
0.17 52 1.59 0.13 38 0.53 0.13 14 3.48
0.27 43 2.11 0.20 35 2.58 0.20 10 0.30
 
 
 
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