| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
|
|---|
| Outline of Final Research Achievements |
The interaction forces between hydrophobic surfaces in solutions were measured using atomic force microscopy (AFM) to explore the origin of hydrophobic force, a long-range force acting between hydrophobic surfaces in water. In the obtained force curves between the surfaces without nanobubbles, which had been considered the main origin of the force thus far, an attractive force was found from a distance of 10-20 nm. This force is longer-ranged than typical van der Waals attractions, showing that there still is an additional force between hydrophobic surfaces even without nanoubbules. We also conducted the force measurements between the fluorinated silica surfaces in formamide and found an attractive force that is stronger than the van der Waals attraction. This result confirms that the ‘solvophobic attraction’, which is very similar to the hydrophobic attraction, exists in some organic solvents. We suggested a few different origins of the forces depending on the conditions.
|
