Abstract
The very strong and long-ranged interaction force between hydrophobic surfaces in water has been a debated issue for a long time. Recent studies suggest that the long-range attraction is attributable to the bridging of nanoscopic bubbles attached on the surfaces. However, it is still unclear at present whether such a bridging is able to exit stably or not. To clarify the existence of the gas bridge, we conducted the optical observation and the force measurement between the hydrophobic glass particle and plate in water simultaneously, using a combined apparatus of an atomic force microscope and an optical inverted microscope. It is found that (i) the image of the dark ring of ca. 1 μm in diameter appears in the region where the existence of the bridge is confirmed by force curves, but disappears when the separation between surfaces becomes shorter than the low limit of the wavelength of visible light, and (ii) the sudden disappearance of the image coincides well with the breakage of the bridge estimated from the separating force curve. The results obtained here are consistent with the above-mentioned mechanism for the long-range attraction between hydropobic surfaces in water.
| Original language | English |
|---|---|
| Pages (from-to) | 112-116 |
| Number of pages | 5 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 253 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2002 |
| Externally published | Yes |
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Keywords
- Atomic force microscope
- Gas bridging
- Hydrophobic attraction
- Optical observation
ASJC Scopus subject areas
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry
- Surfaces and Interfaces
Cite this
Optical observation of gas bridging between hydrophobic surfaces in water. / Ishida, Naoyuki; Sakamoto, Masanobu; Miyahara, Minoru; Higashitani, Ko.
In: Journal of Colloid and Interface Science, Vol. 253, No. 1, 2002, p. 112-116.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Optical observation of gas bridging between hydrophobic surfaces in water
AU - Ishida, Naoyuki
AU - Sakamoto, Masanobu
AU - Miyahara, Minoru
AU - Higashitani, Ko
PY - 2002
Y1 - 2002
N2 - The very strong and long-ranged interaction force between hydrophobic surfaces in water has been a debated issue for a long time. Recent studies suggest that the long-range attraction is attributable to the bridging of nanoscopic bubbles attached on the surfaces. However, it is still unclear at present whether such a bridging is able to exit stably or not. To clarify the existence of the gas bridge, we conducted the optical observation and the force measurement between the hydrophobic glass particle and plate in water simultaneously, using a combined apparatus of an atomic force microscope and an optical inverted microscope. It is found that (i) the image of the dark ring of ca. 1 μm in diameter appears in the region where the existence of the bridge is confirmed by force curves, but disappears when the separation between surfaces becomes shorter than the low limit of the wavelength of visible light, and (ii) the sudden disappearance of the image coincides well with the breakage of the bridge estimated from the separating force curve. The results obtained here are consistent with the above-mentioned mechanism for the long-range attraction between hydropobic surfaces in water.
AB - The very strong and long-ranged interaction force between hydrophobic surfaces in water has been a debated issue for a long time. Recent studies suggest that the long-range attraction is attributable to the bridging of nanoscopic bubbles attached on the surfaces. However, it is still unclear at present whether such a bridging is able to exit stably or not. To clarify the existence of the gas bridge, we conducted the optical observation and the force measurement between the hydrophobic glass particle and plate in water simultaneously, using a combined apparatus of an atomic force microscope and an optical inverted microscope. It is found that (i) the image of the dark ring of ca. 1 μm in diameter appears in the region where the existence of the bridge is confirmed by force curves, but disappears when the separation between surfaces becomes shorter than the low limit of the wavelength of visible light, and (ii) the sudden disappearance of the image coincides well with the breakage of the bridge estimated from the separating force curve. The results obtained here are consistent with the above-mentioned mechanism for the long-range attraction between hydropobic surfaces in water.
KW - Atomic force microscope
KW - Gas bridging
KW - Hydrophobic attraction
KW - Optical observation
UR - http://www.scopus.com/inward/record.url?scp=0036438815&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036438815&partnerID=8YFLogxK
U2 - 10.1006/jcis.2002.8444
DO - 10.1006/jcis.2002.8444
M3 - Article
VL - 253
SP - 112
EP - 116
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 1
ER -