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Fundamentals of water repellency revealed

Date:: August 14, 2017
Source:: VTT Technical Research Centre of Finland
Summary:: The frictional mechanism that resists the motion of drops on inclined surfaces and when affected by wind drag has now been revealed by a team of researchers. They have also developed a theory by which sliding of drops off surfaces of different materials can be predicted. This makes it possible to systematically develop hydrophobic surfaces by modifying their base material and roughness.
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FULL STORY

Principal Scientist of VTT Technical Research Centre of Finland, Dr. Lasse Makkonen has explained the frictional mechanism that resists the motion of drops on inclined surfaces and when affected by wind drag, and developed a theory by which sliding of drops off surfaces of different materials can be predicted. This makes it possible to systematically develop hydrophobic surfaces by modifying their base material and roughness.

Sliding of drops off surfaces affects the water repellency of clothing, visibility through wind screens in rain, and many industrial processes. Hence, wettability of materials is one of the most researched problems in the world.

A major problem has been that according to the force balance of a drop on a surface, proposed by Thomas Young in 1805, even the smallest external force should make the drop slide, but this does not happen in practice no matter how smooth the surface is.

RELATED TOPICS
- Matter & Energy

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Materialsprovided byVTT Technical Research Centre of Finland.注意:内容可能被编辑风格d length.

Journal Reference:

Lasse Makkonen.A thermodynamic model of contact angle hysteresis.The Journal of Chemical Physics, 2017; 147 (6): 064703 DOI:10.1063/1.4996912

Cite This Page:

VTT Technical Research Centre of Finland. "Fundamentals of water repellency revealed." ScienceDaily. ScienceDaily, 14 August 2017. .

VTT Technical Research Centre of Finland. (2017, August 14). Fundamentals of water repellency revealed.ScienceDaily. Retrieved June 25, 2023 from www.koonmotors.com/releases/2017/08/170814092732.htm

VTT Technical Research Centre of Finland. "Fundamentals of water repellency revealed." ScienceDaily. www.koonmotors.com/releases/2017/08/170814092732.htm (accessed June 25, 2023).