کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
593680 1453951 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Novel mechanism for nanotube formation from vesicle: A transition induced by the rearrangement of molecular pairs
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Novel mechanism for nanotube formation from vesicle: A transition induced by the rearrangement of molecular pairs
چکیده انگلیسی

It has been reported that vesicles formed from two simple, achiral chemicals, 2-phenylbenzimidazole 5-sulfonic acid sodium salt (PBSS) and cetyltrimethylammonium bromide (CTAB), could transform to thin nanotubes spontaneously. But the transition process was not well understood. In this paper, the transition was studied in detail using turbidity, UV-adsorption, NMR and TEM methods. As a result, a novel mechanism is presented based on the consideration of the shape of PBSS molecule and its rotation. According to the mechanism, a flat PBSS molecule has different packing parameter at its different side, and further consists molecular pairs with CTAB with different configurations, cylinder-like and cuplike, respectively. While the molecular pairs are randomly arranged, they will form large cuplike units and construct a vesicle. But while the cylinder-like molecular pairs are arranged side by side, they construct a structure with low curvature close to zero at lengthwise, and high curvature at crosswise, so, a thin and long nanotube is formed. Therefore, the transformation from vesicle to nanotube is substantially the configuration change of the molecular pairs. The driving force of the transition could be related to the extenuation of the rotation of the PBSS molecules due to the hindering of the neighbour molecules.

Figure optionsDownload as PowerPoint slideHighlights
► The flat PBSA molecule has two values of Pf or configurations at its different side.
► The configuration change of molecular pair results in the structural transition.
► The driving force could be related to the rotation of the PBSA molecules.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 422, 5 April 2013, Pages 148–154
نویسندگان
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