Download e-book for kindle: Capillarity and Wetting Phenomena: Drops, Bubbles, Pearls, by Pierre-Gilles de Gennes

By Pierre-Gilles de Gennes

ISBN-10: 0387216561

ISBN-13: 9780387216560

ISBN-10: 1441918337

ISBN-13: 9781441918338

As i look out my window within the early morning, i will see beads of droplets gracing a spider net. The movie of dew that has settled at the threads is volatile and breaks up spontaneously into droplets. This phenomenon has implications for the remedy of cloth fibers (the approach often called "oiling"), glass, and carbon. it's no less significant whilst making use of mascara! I take my morning bathe. the instant I step out, I dry off when it comes to evaporation (which makes me suppose chilly) and by way of dewetting (the method through which dry parts shape spontaneously and extend on my skin). As I rush into my motor vehicle lower than a pelting rain, my cognizance is stuck by way of small drops caught on my windshield. I additionally detect higher drops rolling down and others greater nonetheless that, like snails, depart at the back of them a path of water. I ask myself what the adaptation is among those rolling drops and grains of sand tumbling down an incline. i ponder why the smallest drops stay caught. The solutions to such questions do aid vehicle brands deal with the skin of glass and alter the lean of windshields.

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Extra info for Capillarity and Wetting Phenomena: Drops, Bubbles, Pearls, Waves

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J. Van Oss, Interfacial Forces in Aqueous Media (New York: Marcel Dekker, 1994). 19 1. Langmuir, J. Chem. Phys. 1, 756 (1933). 20 J. F. Joanny, Physico Chemical Hydrodynamics 9, 189 (1987); A. M. Cazabat, J. Colloid Interface Sci. 133, 452 (1989). 2 Capillarity and Gravity Liquids display rather peculiar properties. 1), move up inclined planes, or rise in very small capillary tubes.! Moreover, drops may lose their spherical shape under the influence of gravity. 1 The Capillary Length /'1;-1 There exists a particular length, denoted A;-l, beyond which gravity becomes important.

Using the curve describing the relation cos 0 = f (-y), deduce the critical surface tension "'fe of the treated surface. Projection. For angles OE greater than 45°, the measurement relies on an optical imaging technique (the previous setup is inherently limited to angles less than 45°). The drop is placed between an intense light source and a converging lens of focal lens F. The projected image is displayed on a screen located at a large distance L. 6b). The measurement accuracy is of the order of 2° .

The astronomer Geminiano Montanari (1633-1687) compared the rise of a liquid in a tube to that of sap in a plant. Giovanni Borelli (1608- 1679), better known for his observations of Jupiter's moons and his research on the locomotion of animals (notably flees), demonstrated in 1670 that the height reached by a liquid is inversely proportional to the radius of the tube. But the real star in the story, a man unjustly forgotten today, is Francis Hauksbee (1713), who was the first to study the phenomenon in a 50 2.

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Capillarity and Wetting Phenomena: Drops, Bubbles, Pearls, Waves by Pierre-Gilles de Gennes

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