کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10378185 | 880750 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of head group polarity and spacer chain length on the aggregation properties of gemini surfactants in an aquatic environment
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of head group polarity and spacer chain length on the aggregation properties of gemini surfactants in an aquatic environment Effect of head group polarity and spacer chain length on the aggregation properties of gemini surfactants in an aquatic environment](/preview/png/10378185.png)
چکیده انگلیسی
The aggregation behavior of cationic gemini surfactants with respect to variation in head group polarity and spacer length is studied through conductance, surface tension, viscosity, and small-angle neutron-scattering (SANS) measurements. The critical micellar concentration (cmc), average degree of micelle ionization (βave), minimum area per molecule of surfactant at the air-water interface (Amin), surface excess concentration (Îmax), and Gibb's free energy of micellization (ÎGmic) of the surfactants were determined from conductance and surface tension data. The aggregation numbers (N), dimensions of micelles (b/a), effective fractional charge per monomer (α), and hydration of micelles (hE) were determined from SANS and viscosity data, respectively. The increasing head group polarity of gemini surfactant with spacer chain length of 4 methylene units promotes micellar growth, leading to a decrease in cmc, βave, and ÎGmic and an increase in N and b/a. This is well supported by the observed increase in hydration (hE) of micelles with increase in aggregation number (N) and dimension (b/a) of micelle.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 284, Issue 1, 1 April 2005, Pages 282-288
Journal: Journal of Colloid and Interface Science - Volume 284, Issue 1, 1 April 2005, Pages 282-288
نویسندگان
Mahendra Borse, Vikas Sharma, V.K. Aswal, P.S. Goyal, Surekha Devi,