Table 3 Variation trend of surface tension (mN/m) of several vegetable oils with temperatures between 20 ℃ and 200 ℃
From: Vegetable Oil-Based Nanolubricants in Machining: From Physicochemical Properties to Application
Temperature (℃) | Surface tension (mN/m) | ||||
|---|---|---|---|---|---|
Rapeseed oil | Corn oil | Palm oil | Sunflower oil | Soybean oil | |
20 | 33.8 | 33.8 | ‒ | 34.0 | 33.9 |
40 | 32.0 | 32.2 | 31.5 | 32.3 | 32.2 |
60 | 30.5 | 30.6 | 30.0 | 30.7 | 30.6 |
80 | 29.0 | 29.1 | 28.5 | 29.2 | 29.1 |
100 | 27.5 | 27.6 | 27.1 | 27.7 | 27.6 |
120 | 26.0 | 26.1 | 25.7 | 26.3 | 26.1 |
140 | 24.5 | 24.6 | 24.4 | 24.8 | 24.7 |
160 | 23.1 | 23.2 | 23.0 | 23.0 | 23.2 |
180 | 21.7 | 21.8 | 21.6 | 21.6 | 21.8 |
200 | 20.3 | 20.4 | ‒ | 20.2 | 20.4 |