Mixed monolayers of quaternary ammonium gemini Surfactants with octadecyl alcohol
Zhou Dong-Liang; Yang Hong-Wei; Zhu Pu-Xin; Sun Yu-Hai; Feng Yu-Jun; Wu Da-Cheng
| HERO ID | 4937213 |
|---|---|
| In Press | No |
| Year | 2007 |
| Title | Mixed monolayers of quaternary ammonium gemini Surfactants with octadecyl alcohol |
| Authors | Zhou Dong-Liang; Yang Hong-Wei; Zhu Pu-Xin; Sun Yu-Hai; Feng Yu-Jun; Wu Da-Cheng |
| Journal | Gaodeng Xuexiao Huaxue Xuebao / Chemical Journal of Chinese Universities |
| Volume | 28 |
| Issue | 5 |
| Page Numbers | 932-935 |
| Abstract | pi-A isotherms were studied for mixed monolayers formed from each of two cationic gemini surfactants(dissymmetrical gemini surfactant 12-2-16 and symmetrical gemini surfactant 12-2-12) with octadecyl alcohol (C18H37OH) on air-water interface. The mixed surface excess free energy, Delta G(M)(exc), was analyzed for each mixed monolayer with various mixed molar ratios at different surface pressures under the point of phase separation; to analyze the compatibility of each of the gimini surfactants and the fatty alcohol in the monolayer. The results show that Delta G(M)(exc) changes with the nature of the mixed molecules, mixed molar ratio, and surface pres sure. Mixed monolayers of 12-2-16 and C18H37OH were considered as incompatible because Delta G(M))(exc) > 0 in all mixed molar ratios. While for a system where 12-2-12 is mixed with C18H37OH, the compatibility of the mixed monolayer lies mostly on the mixed molar ratio. The values of Delta G(M)(exc) augment with increasing the C18H37OH molar ratio, changing from a net attractive interaction to a net repulsive interaction between 12-2-12 and C18H37OH with a critical point of C18H37OH molar ratio 0. 65 added in the mixed system. When the mixing system is thermodynamically favored, increasing surface pressure will promote the mixing; In contrast, increasing surface pressure for a repulsive mixed system will be more thermodynamically unfavorable. |
| Wosid | WOS:000246787400032 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | quaternary ammonium Gemini surfactant; octadecyl alcohol; mixed monolayer; mixed surface excess free energy |