کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5359575 1503668 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of aluminium surface morphology and chemical modification on wettability
ترجمه فارسی عنوان
اثرات مورفولوژی سطح آلومینیوم و اصلاح شیمیایی بر روی قابلیت رطوبت
کلمات کلیدی
اصلاح سطح، زاویه تماس، سطح آلومینیوم، خشونت، در محل پلیمریزاسیون، رسوبات بخار مولکولی،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی


- Successful surface modification procedures on aluminium samples were performed involving formation of the layer of hydrophilic hyperbranched polyethyleneglycol (PEG) via in situ polymerization, molecular vapour deposition of a monolayer of fluorinated silane, and a combination of those.
- The groups of surfaces with hydrophobic behavior were found to follow the Wenzel model.
- A transition from Cassie-Baxter's to Wenzel's regime was observed due to changing of the surface roughness upon mechanical polishing in aluminium samples.

Aluminium alloys are some of the predominant metals in industrial applications such as production of heat exchangers, heat pumps. They have high heat conductivity coupled with a low specific weight. In cold working conditions, there is a risk of frost formation on the surface of aluminium in the presence of water vapour, which can lead to the deterioration of equipment performance. This work addresses the methods of surface modification of aluminium and their effect of the underlying surface morphology and wettability, which are the important parameters for frost formation. Three groups of real-life aluminium surfaces of different morphology: unpolished aluminium, polished aluminium, and aluminium foil, were subjected to surface modification procedures which involved the formation of a layer of hydrophilic hyperbranched polyethyleneglycol via in situ polymerization, molecular vapour deposition of a monolayer of fluorinated silane, and a combination of those. The effect of these surface modification techniques on roughness and wettability of the aluminium surfaces was elucidated by ellipsometry, contact angle measurements and atomic force microscopy. We demonstrated that by employing different types of surface modifications the contact angle of water droplets on aluminium samples can be varied from 12° to more than 120°. A crossover from Cassie-Baxter to Wenzel regime upon changing the surface roughness was also observed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 296, 30 March 2014, Pages 124-132
نویسندگان
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