کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
598261 1454087 2006 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Langmuir–Blodgett membrane of amphiphilic di-block copolymer as the quasi-equilibrium state
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Langmuir–Blodgett membrane of amphiphilic di-block copolymer as the quasi-equilibrium state
چکیده انگلیسی

The Langmuir–Blodgett (LB) membrane of amphiphilic di-block copolymer, PEO40-b-PMA(Az)19, was prepared at 24 mN m−1 of surface pressure in the two-dimensional solid state. The structure of 20 layers LB membrane was analyzed by X-ray diffraction (XRD), total X-ray reflectivity (TR) and grazing incidence X-ray scattering (GISAXS) measurements. The molecular section area of one hydrophobic PMA(Az) molecule obtained by π–A isotherm was 0.31 nm2. The LB membrane thickness was 67.9 nm consisted of the ordered lamellar structure with 3.2 nm spacing from TR and XRD measurements. From azimuthally scattering of GISAXS, two ordered structures with 0.4 and 2.175 nm existed perpendicular to LB surface, the former was corresponded to the distance between azobenzenes with random orientation and the latter was to the compressed PMA(Az)19 domains which oriented normal to the dipping direction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volumes 284–285, 15 August 2006, Pages 305–308
نویسندگان
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