التفاصيل البيبلوغرافية
| العنوان: |
Surface and Foaming Properties of Alkylamine Oxide: Protonation and Counterion Effects |
| المؤلفون: |
Song, Shi-Li, Hu, Zhi-Guo, Dong, Jin-Feng, Zhang, Gao-Yong |
| المصدر: |
Tenside Surfactants Detergents; September 2005, Vol. 42 Issue: 4 p232-236, 5p |
| مستخلص: |
The influence of protonated species or nonionic forms of N, N-bis(2-hydroxyethyl) dodecylamine oxide (C12DHEAO) on interfacial properties is studied by measuring foamability, foam stability, equilibrium surface tension and surface viscosity. Surface tensions of the protonated species with various counterions, Cl-, NO3-, ClO4-and BF4-show a decrease in the following order: C12DHEAO Cl-> C12DHEAO NO3-> C12DHEAO ClO4-> C12DHEAO BF4-. Foamability done using shaking method shows a reverse order for Cl-, NO3-, ClO4-. But the foamability of C12DHEAO BF4-is lower than that of C12DHEAO ClO4-. This has been explained in terms of the differences in the lipophilicity the micellar stability. This is further confirmed by our dynamic surface tension results. The equilibrium surface tension values for 20mM C12DHEAO solution shows a vague minimum in the range 4.20 < pH < 5.81. The foamability of C12DHEAO solution shows decrease with the values of pH. This can be elucidated by the differences in the interactions between cationic and nonionic species, nonionic and nonionic forms. The foam of protonated C12DHEAO having counterions Cl-, NO3-and ClO4-are very unstable. The foam stability of C12DHEAO BF4-is much greater than other protonated C12DHEAO. The foam stability of C12DHEAO solution at different values of pH shows similar order as surface tension. Foam are more stable in the range 4.20 < pH < 5.81 than that at other values of pH. |
| قاعدة البيانات: |
Supplemental Index |
