Author/Authors :
J ،Sayyad Amin School of and Chemical and Petroleum Engineering - Shiraz University, Shiraz, Iran , Sh ،Ayatollahi School of and Chemical and Petroleum Engineering - Shiraz University, Shiraz, Iran , A ،Alamdari School of and Chemical and Petroleum Engineering - Shiraz University, Shiraz, Iran , M ،Escrochi School of and Chemical and Petroleum Engineering - Shiraz University, Shiraz, Iran , H ،Jahromi School of and Chemical and Petroleum Engineering - Shiraz University, Shiraz, Iran , E ،Nikooee School of and Chemical and Petroleum Engineering - Shiraz University, Shiraz, Iran
كليدواژه :
Bi-fractal , surface roughness , AFM , SEM , topography
چكيده فارسي :
استفاده ازتصاوير AFM (Atomic Force Microscopy) و SEM (Scanning Electron Microscopy) از روش هاي كاربردي متداول براي تحقيق بر روي توپوگرافي سطح مي باشد آناليز فركتالي بعد فركتالي سطح را فراهم مي كند كه به عنوان يكي از مشخصه هاي سطح ناهمگن استفاده مي شود. رسوب مواد آلي بر روي سطح و رشد نا منظم آن باعث تغيير مورفولوژي سطح شده و آن را از حالت همگن به ناهمگن تبديل مي كند. در اين تحقيق سعي شده است كه بعد فركتالي سطح ناهمگن در اثر رسوب آسفاتين و رشد آن بر سطح شيشه به صورت باي فركتالي مورد بررسي قرار گيرد. دو ناحيه رسوب مختلف مشاهده شد و بعد فركتالي هر ناحيه محاسبه شد. اطلاعات توپوگرافي سطوح بر اساس آناليز تصويري به دست آمد. آناليز بعد فركتالي نشان مي دهد كه تغيير توپوگرافي در ناحيه دو (ماكرو آسپريتي) شديدتر از ناحيه يك (ميكرو آسپريتي) بوده و ارتباط خوبي بين ابعاد فركتالي استنتاج شده از تصاوير AFM در مقايسه با ابعاد فركتالي استنتاج شده از تصاوير SEM برقرار مي باشد.
چكيده لاتين :
Using AFM (Atomic Force Microscopy) and SEM (Scanning Electron Microscopy) images are common applied
methods to investigate homogeneous surface topography. Fractal analysis of the images provides fractal dimension of
the surface which is used for heterogeneous surface indices. Precipitation of organic materials on a rough surface and its
irregular growth result in morphology changes and converts a homogeneous surface to a heterogeneous one. In this
paper, the topography alteration of a glass surface as a result of asphaltene precipitation and its growth at various
pressures was investigated by bi-fractal approach. Two different regions on the deposited surfaces were observed. These
two regions named micro asperities (Zone I) and macro asperities (Zone II) namely. and the fractal dimension of each
zone was calculated. The topography information of the surfaces was obtained by two image analyses. The bi-fractal
analysis demonstrated that topography alteration in zone II (macro asperities) is more evident than that in zone I (micro
asperities) and a better correlation was observed between the fractal dimensions inferred from the AFM images (DA)
than the SEM images (DS).
