کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9757696 | 1496386 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of electrolyte on the morphology of vesicles composed of the dialkyl polyoxyethylene ether surfactant 2C18E12
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
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چکیده انگلیسی
Small-angle neutron-scattering (SANS) studies were performed on vesicles composed of 1,2-di-O-octadecyl-rac-glyceryl-3-(Ï-methoxydodecaethylene glycol), in deuterium oxide (D2O) solutions with various ionic strengths of LiCl, NaCl and NaI. Gross vesicle morphologies, examined using freeze-fracture electron microscopy, showed that NaCl promoted the formation of multilamellar vesicles. Model fitting of the SANS data showed changes in bilayer parameters such as thickness and repeat spacings, in response to the presence of ions in the bulk solution. 2C18E12 vesicles in D2O are shown to exist as predominantly unilamellar structures with a bilayer thickness of â¼51Â Ã
. Vesicles in increasing concentrations of LiCl and NaCl exhibit decreased layer thickness and increased lamelarity. Little change was observed for vesicles formed in NaI solutions. We suggest that these changes result from intrusion of E12 headgroups into the alkyl chain region of the vesicle bilayers, in response to the increase in concentration of ions present and their charge density.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemistry and Physics of Lipids - Volume 133, Issue 1, January 2005, Pages 27-36
Journal: Chemistry and Physics of Lipids - Volume 133, Issue 1, January 2005, Pages 27-36
نویسندگان
Richard D. Harvey, Richard K. Heenan, David J. Barlow, M. Jayne Lawrence,