کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675732 | 1454105 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Changes in surface heterogeneity of multi-walled carbon nanotubes due to adsorption of poly(acrylic acid) by derivative isotherm summation method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The heterogeneity of surface energy of multi-walled carbon nanotubes (MWNTs) before and after the adsorption of poly(acrylic acid) (PAA) is investigated on the basis of low-pressure adsorption isotherms of nitrogen at 77Â K using derivative isotherm summation (DIS) method. Two types of dominant energetic surfaces are recognized in the pure MWNTs. While raising the adsorption amount of PAA, significant decrease in both the specific surface area and the heterogeneity of surface energy is found. It is indicated in detail that the contribution of high-energy surface reduces remarkably due to screening effect of adsorbed PAA, and PAA molecules could block some interparticle pores resulting in the decrease in total surface area of MWNTs. DIS analysis of the low-pressure data of the nitrogen adsorption isotherms was shown to be a feasible and effective tool to characterize the surface heterogeneity of nanoparticles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 264, Issues 1â3, 15 August 2005, Pages 219-223
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 264, Issues 1â3, 15 August 2005, Pages 219-223
نویسندگان
Qing-Feng Hou, Xian-Cai Lu, Zhi-Jun Lu, Xian-Dong Liu,