کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675854 | 1454108 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface forces measured between an air bubble and a solid surface in water
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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
Surface forces between an air bubble and a flat mica surface have been investigated using a modified surface force apparatus. This method allows forces to be detected in two regimes: at long-range, where the bubble is distorted slightly by the surface forces, and at short-range, where the force is manifest as disjoining pressure in a thin wetting film separating the bubble from the solid. A long-range double-layer repulsion was detected, which indicates that there is a negative surface charge at the air-water interface. However, when the bubble is pressed closer to the mica, charge regulation effects cause a reversal of sign and the double-layer force becomes attractive. This causes an “adhesion” of the bubble to the mica, even when a wetting film remains between them, and a finite force is required to pull the bubble from the mica.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 261, Issues 1â3, 1 July 2005, Pages 147-152
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 261, Issues 1â3, 1 July 2005, Pages 147-152
نویسندگان
Rada A. Pushkarova, Roger G. Horn,